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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">filename</span> <span class="o">=</span> <span class="s1">&#39;gd1_results.fits&#39;</span>
<span class="kn">from</span> <span class="nn">astropy.table</span> <span class="kn">import</span> <span class="n">Table</span>
<span class="n">results</span> <span class="o">=</span> <span class="n">Table</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">filename</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">pyia</span> <span class="kn">import</span> <span class="n">GaiaData</span>
<span class="n">gaia_data</span> <span class="o">=</span> <span class="n">GaiaData</span><span class="p">(</span><span class="n">results</span><span class="p">)</span>
<span class="nb">type</span><span class="p">(</span><span class="n">gaia_data</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">astropy.units</span> <span class="k">as</span> <span class="nn">u</span>
<span class="n">skycoord</span> <span class="o">=</span> <span class="n">gaia_data</span><span class="o">.</span><span class="n">get_skycoord</span><span class="p">(</span>
<span class="n">distance</span><span class="o">=</span><span class="mi">8</span><span class="o">*</span><span class="n">u</span><span class="o">.</span><span class="n">kpc</span><span class="p">,</span>
<span class="n">radial_velocity</span><span class="o">=</span><span class="mi">0</span><span class="o">*</span><span class="n">u</span><span class="o">.</span><span class="n">km</span><span class="o">/</span><span class="n">u</span><span class="o">.</span><span class="n">s</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">gala.coordinates</span> <span class="k">as</span> <span class="nn">gc</span>
<span class="n">transformed</span> <span class="o">=</span> <span class="n">skycoord</span><span class="o">.</span><span class="n">transform_to</span><span class="p">(</span><span class="n">gc</span><span class="o">.</span><span class="n">GD1Koposov10</span><span class="p">)</span>
<span class="nb">type</span><span class="p">(</span><span class="n">transformed</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">gd1_coord</span> <span class="o">=</span> <span class="n">gc</span><span class="o">.</span><span class="n">reflex_correct</span><span class="p">(</span><span class="n">transformed</span><span class="p">)</span>
<span class="nb">type</span><span class="p">(</span><span class="n">gd1_coord</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">phi1</span> <span class="o">=</span> <span class="n">gd1_coord</span><span class="o">.</span><span class="n">phi1</span>
<span class="n">phi2</span> <span class="o">=</span> <span class="n">gd1_coord</span><span class="o">.</span><span class="n">phi2</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>
<span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">phi1</span><span class="p">,</span> <span class="n">phi2</span><span class="p">,</span> <span class="s1">&#39;ko&#39;</span><span class="p">,</span> <span class="n">markersize</span><span class="o">=</span><span class="mf">0.1</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.2</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlabel</span><span class="p">(</span><span class="s1">&#39;ra (degree GD1)&#39;</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylabel</span><span class="p">(</span><span class="s1">&#39;dec (degree GD1)&#39;</span><span class="p">);</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">pandas</span> <span class="k">as</span> <span class="nn">pd</span>
<span class="n">df</span> <span class="o">=</span> <span class="n">results</span><span class="o">.</span><span class="n">to_pandas</span><span class="p">()</span>
<span class="n">df</span><span class="o">.</span><span class="n">shape</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>(140340, 8)
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">df</span><span class="p">[</span><span class="s1">&#39;phi1&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">gd1_coord</span><span class="o">.</span><span class="n">phi1</span>
<span class="n">df</span><span class="p">[</span><span class="s1">&#39;phi2&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">gd1_coord</span><span class="o">.</span><span class="n">phi2</span>
<span class="n">df</span><span class="o">.</span><span class="n">shape</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>(140340, 10)
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">df</span><span class="p">[</span><span class="s1">&#39;pm_phi1&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">gd1_coord</span><span class="o">.</span><span class="n">pm_phi1_cosphi2</span>
<span class="n">df</span><span class="p">[</span><span class="s1">&#39;pm_phi2&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">gd1_coord</span><span class="o">.</span><span class="n">pm_phi2</span>
<span class="n">df</span><span class="o">.</span><span class="n">shape</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>(140340, 12)
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">phi2_min</span> <span class="o">=</span> <span class="o">-</span><span class="mf">1.0</span> <span class="o">*</span> <span class="n">u</span><span class="o">.</span><span class="n">deg</span>
<span class="n">phi2_max</span> <span class="o">=</span> <span class="mf">1.0</span> <span class="o">*</span> <span class="n">u</span><span class="o">.</span><span class="n">deg</span>
<span class="n">phi_mask</span> <span class="o">=</span> <span class="p">((</span><span class="n">df</span><span class="p">[</span><span class="s1">&#39;phi2&#39;</span><span class="p">]</span> <span class="o">&gt;</span> <span class="n">phi2_min</span><span class="p">)</span> <span class="o">&amp;</span>
<span class="p">(</span><span class="n">df</span><span class="p">[</span><span class="s1">&#39;phi2&#39;</span><span class="p">]</span> <span class="o">&lt;</span> <span class="n">phi2_max</span><span class="p">))</span>
<span class="n">phi_mask</span><span class="o">.</span><span class="n">sum</span><span class="p">()</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>25084
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">centerline</span> <span class="o">=</span> <span class="n">df</span><span class="p">[</span><span class="n">phi_mask</span><span class="p">]</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">pm1</span> <span class="o">=</span> <span class="n">centerline</span><span class="p">[</span><span class="s1">&#39;pm_phi1&#39;</span><span class="p">]</span>
<span class="n">pm2</span> <span class="o">=</span> <span class="n">centerline</span><span class="p">[</span><span class="s1">&#39;pm_phi2&#39;</span><span class="p">]</span>
<span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">pm1</span><span class="p">,</span> <span class="n">pm2</span><span class="p">,</span> <span class="s1">&#39;ko&#39;</span><span class="p">,</span> <span class="n">markersize</span><span class="o">=</span><span class="mf">0.3</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlabel</span><span class="p">(</span><span class="s1">&#39;Proper motion phi1 (GD1 frame)&#39;</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylabel</span><span class="p">(</span><span class="s1">&#39;Proper motion phi2 (GD1 frame)&#39;</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlim</span><span class="p">(</span><span class="o">-</span><span class="mi">12</span><span class="p">,</span> <span class="mi">8</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylim</span><span class="p">(</span><span class="o">-</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">pm1_min</span> <span class="o">=</span> <span class="o">-</span><span class="mf">8.9</span>
<span class="n">pm1_max</span> <span class="o">=</span> <span class="o">-</span><span class="mf">6.9</span>
<span class="n">pm2_min</span> <span class="o">=</span> <span class="o">-</span><span class="mf">2.2</span>
<span class="n">pm2_max</span> <span class="o">=</span> <span class="mf">1.0</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">pm1_rect</span> <span class="o">=</span> <span class="p">[</span><span class="n">pm1_min</span><span class="p">,</span> <span class="n">pm1_min</span><span class="p">,</span> <span class="n">pm1_max</span><span class="p">,</span> <span class="n">pm1_max</span><span class="p">,</span> <span class="n">pm1_min</span><span class="p">]</span> <span class="o">*</span> <span class="n">u</span><span class="o">.</span><span class="n">mas</span><span class="o">/</span><span class="n">u</span><span class="o">.</span><span class="n">yr</span>
<span class="n">pm2_rect</span> <span class="o">=</span> <span class="p">[</span><span class="n">pm2_min</span><span class="p">,</span> <span class="n">pm2_max</span><span class="p">,</span> <span class="n">pm2_max</span><span class="p">,</span> <span class="n">pm2_min</span><span class="p">,</span> <span class="n">pm2_min</span><span class="p">]</span> <span class="o">*</span> <span class="n">u</span><span class="o">.</span><span class="n">mas</span><span class="o">/</span><span class="n">u</span><span class="o">.</span><span class="n">yr</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">pm1</span><span class="p">,</span> <span class="n">pm2</span><span class="p">,</span> <span class="s1">&#39;ko&#39;</span><span class="p">,</span> <span class="n">markersize</span><span class="o">=</span><span class="mf">0.3</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">pm1_rect</span><span class="p">,</span> <span class="n">pm2_rect</span><span class="p">,</span> <span class="s1">&#39;-&#39;</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlabel</span><span class="p">(</span><span class="s1">&#39;Proper motion phi1 (GD1 frame)&#39;</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylabel</span><span class="p">(</span><span class="s1">&#39;Proper motion phi2 (GD1 frame)&#39;</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlim</span><span class="p">(</span><span class="o">-</span><span class="mi">12</span><span class="p">,</span> <span class="mi">8</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylim</span><span class="p">(</span><span class="o">-</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">between</span><span class="p">(</span><span class="n">series</span><span class="p">,</span> <span class="n">low</span><span class="p">,</span> <span class="n">high</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Make a Boolean Series.</span>
<span class="sd"> </span>
<span class="sd"> series: Pandas Series</span>
<span class="sd"> low: lower bound</span>
<span class="sd"> high: upper bound</span>
<span class="sd"> </span>
<span class="sd"> returns: Boolean Series</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">return</span> <span class="p">(</span><span class="n">series</span> <span class="o">&gt;</span> <span class="n">low</span><span class="p">)</span> <span class="o">&amp;</span> <span class="p">(</span><span class="n">series</span> <span class="o">&lt;</span> <span class="n">high</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">pm_mask</span> <span class="o">=</span> <span class="p">(</span><span class="n">between</span><span class="p">(</span><span class="n">df</span><span class="p">[</span><span class="s1">&#39;pm_phi1&#39;</span><span class="p">],</span> <span class="n">pm1_min</span><span class="p">,</span> <span class="n">pm1_max</span><span class="p">)</span> <span class="o">&amp;</span>
<span class="n">between</span><span class="p">(</span><span class="n">df</span><span class="p">[</span><span class="s1">&#39;pm_phi2&#39;</span><span class="p">],</span> <span class="n">pm2_min</span><span class="p">,</span> <span class="n">pm2_max</span><span class="p">))</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">pm_mask</span><span class="o">.</span><span class="n">sum</span><span class="p">()</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>1049
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">selected</span> <span class="o">=</span> <span class="n">df</span><span class="p">[</span><span class="n">pm_mask</span><span class="p">]</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">phi1</span> <span class="o">=</span> <span class="n">selected</span><span class="p">[</span><span class="s1">&#39;phi1&#39;</span><span class="p">]</span>
<span class="n">phi2</span> <span class="o">=</span> <span class="n">selected</span><span class="p">[</span><span class="s1">&#39;phi2&#39;</span><span class="p">]</span>
<span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">phi1</span><span class="p">,</span> <span class="n">phi2</span><span class="p">,</span> <span class="s1">&#39;ko&#39;</span><span class="p">,</span> <span class="n">markersize</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlabel</span><span class="p">(</span><span class="s1">&#39;ra (degree GD1)&#39;</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylabel</span><span class="p">(</span><span class="s1">&#39;dec (degree GD1)&#39;</span><span class="p">);</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">filename</span> <span class="o">=</span> <span class="s1">&#39;gd1_dataframe.hdf5&#39;</span>
<span class="n">df</span><span class="o">.</span><span class="n">to_hdf</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">&#39;df&#39;</span><span class="p">)</span>
<span class="n">centerline</span><span class="o">.</span><span class="n">to_hdf</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">&#39;centerline&#39;</span><span class="p">)</span>
<span class="n">selected</span><span class="o">.</span><span class="n">to_hdf</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">&#39;selected&#39;</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="o">!</span>ls -lh gd1_dataframe.hdf5
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>-rw-rw-r-- 1 downey downey 17M Nov 18 19:06 gd1_dataframe.hdf5
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="o">!</span>rm gd1_dataframe.hdf5
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="o">!</span>wget https://github.com/AllenDowney/AstronomicalData/raw/main/data/gd1_dataframe.hdf5
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>--2020-11-18 19:31:21-- https://github.com/AllenDowney/AstronomicalData/raw/main/data/gd1_dataframe.hdf5
Resolving github.com... 140.82.114.3
Connecting to github.com|140.82.114.3|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://raw.githubusercontent.com/AllenDowney/AstronomicalData/main/data/gd1_dataframe.hdf5 [following]
--2020-11-18 19:31:21-- https://raw.githubusercontent.com/AllenDowney/AstronomicalData/main/data/gd1_dataframe.hdf5
Resolving raw.githubusercontent.com... 151.101.116.133
Connecting to raw.githubusercontent.com|151.101.116.133|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 17335888 (17M) [application/octet-stream]
Saving to: ‘gd1_dataframe.hdf5’
gd1_dataframe.hdf5 100%[===================&gt;] 16.53M 8.77MB/s in 1.9s
2020-11-18 19:31:24 (8.77 MB/s) - ‘gd1_dataframe.hdf5’ saved [17335888/17335888]
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">pandas</span> <span class="k">as</span> <span class="nn">pd</span>
<span class="n">filename</span> <span class="o">=</span> <span class="s1">&#39;gd1_dataframe.hdf5&#39;</span>
<span class="n">df</span> <span class="o">=</span> <span class="n">pd</span><span class="o">.</span><span class="n">read_hdf</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">&#39;df&#39;</span><span class="p">)</span>
<span class="n">centerline</span> <span class="o">=</span> <span class="n">pd</span><span class="o">.</span><span class="n">read_hdf</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">&#39;centerline&#39;</span><span class="p">)</span>
<span class="n">selected</span> <span class="o">=</span> <span class="n">pd</span><span class="o">.</span><span class="n">read_hdf</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">&#39;selected&#39;</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">df</span><span class="o">.</span><span class="n">shape</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>(140340, 12)
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">centerline</span><span class="o">.</span><span class="n">shape</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>(25084, 12)
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">selected</span><span class="o">.</span><span class="n">shape</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>(1049, 12)
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">points</span> <span class="o">=</span> <span class="n">selected</span><span class="p">[[</span><span class="s1">&#39;pmra&#39;</span><span class="p">,</span> <span class="s1">&#39;pmdec&#39;</span><span class="p">]]</span><span class="o">.</span><span class="n">to_numpy</span><span class="p">()</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">points</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>array([[ -3.65859609, -12.48641977],
[ -3.57235105, -13.19584836],
[ -4.52678061, -12.74505387],
...,
[ -3.7313674 , -13.06684162],
[ -3.63378135, -12.93358913],
[ -3.44742277, -13.22808211]])
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">points</span><span class="o">.</span><span class="n">shape</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>(1049, 2)
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">scipy.spatial</span> <span class="kn">import</span> <span class="n">ConvexHull</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">hull</span> <span class="o">=</span> <span class="n">ConvexHull</span><span class="p">(</span><span class="n">points</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">hull</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>&lt;scipy.spatial.qhull.ConvexHull at 0x7fac07b1b8e0&gt;
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">hull</span><span class="o">.</span><span class="n">vertices</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>array([ 692, 873, 141, 303, 42, 622, 45, 83, 127, 182, 1006,
971, 967, 1001, 969, 940], dtype=int32)
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">pm_vertices</span> <span class="o">=</span> <span class="n">points</span><span class="p">[</span><span class="n">hull</span><span class="o">.</span><span class="n">vertices</span><span class="p">]</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="nb">type</span><span class="p">(</span><span class="n">pm_vertices</span><span class="p">)</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>numpy.ndarray
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">pm_vertices</span><span class="o">.</span><span class="n">shape</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>(16, 2)
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">pm_vertices</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>array([[ -4.05037121, -14.75623261],
[ -3.41981085, -14.72365546],
[ -3.03521988, -14.44357135],
[ -2.26847919, -13.7140236 ],
[ -2.61172203, -13.24797471],
[ -2.73471401, -13.09054471],
[ -3.19923146, -12.5942653 ],
[ -3.34082546, -12.47611926],
[ -5.67489413, -11.16083338],
[ -5.95159272, -11.10547884],
[ -6.42394023, -11.05981295],
[ -7.09631023, -11.95187806],
[ -7.30641519, -12.24559977],
[ -7.04016696, -12.88580702],
[ -6.00347705, -13.75912098],
[ -4.42442296, -14.74641176]])
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">xs</span><span class="p">,</span> <span class="n">ys</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">transpose</span><span class="p">(</span><span class="n">pm_vertices</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">xs</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>array([-4.05037121, -3.41981085, -3.03521988, -2.26847919, -2.61172203,
-2.73471401, -3.19923146, -3.34082546, -5.67489413, -5.95159272,
-6.42394023, -7.09631023, -7.30641519, -7.04016696, -6.00347705,
-4.42442296])
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">ys</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>array([-14.75623261, -14.72365546, -14.44357135, -13.7140236 ,
-13.24797471, -13.09054471, -12.5942653 , -12.47611926,
-11.16083338, -11.10547884, -11.05981295, -11.95187806,
-12.24559977, -12.88580702, -13.75912098, -14.74641176])
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">pm1</span> <span class="o">=</span> <span class="n">centerline</span><span class="p">[</span><span class="s1">&#39;pmra&#39;</span><span class="p">]</span>
<span class="n">pm2</span> <span class="o">=</span> <span class="n">centerline</span><span class="p">[</span><span class="s1">&#39;pmdec&#39;</span><span class="p">]</span>
<span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">pm1</span><span class="p">,</span> <span class="n">pm2</span><span class="p">,</span> <span class="s1">&#39;ko&#39;</span><span class="p">,</span> <span class="n">markersize</span><span class="o">=</span><span class="mf">0.3</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<span class="n">pm1</span> <span class="o">=</span> <span class="n">selected</span><span class="p">[</span><span class="s1">&#39;pmra&#39;</span><span class="p">]</span>
<span class="n">pm2</span> <span class="o">=</span> <span class="n">selected</span><span class="p">[</span><span class="s1">&#39;pmdec&#39;</span><span class="p">]</span>
<span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">pm1</span><span class="p">,</span> <span class="n">pm2</span><span class="p">,</span> <span class="s1">&#39;gx&#39;</span><span class="p">,</span> <span class="n">markersize</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">xs</span><span class="p">,</span> <span class="n">ys</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlabel</span><span class="p">(</span><span class="s1">&#39;Proper motion ra (ICRS frame)&#39;</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylabel</span><span class="p">(</span><span class="s1">&#39;Proper motion dec (ICRS frame)&#39;</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlim</span><span class="p">([</span><span class="o">-</span><span class="mi">10</span><span class="p">,</span> <span class="mi">5</span><span class="p">])</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylim</span><span class="p">([</span><span class="o">-</span><span class="mi">20</span><span class="p">,</span> <span class="mi">5</span><span class="p">]);</span>
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<img alt="_images/pilot_day3_45_0.png" src="_images/pilot_day3_45_0.png" />
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">pm_vertices</span>
</pre></div>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>array([[ -4.05037121, -14.75623261],
[ -3.41981085, -14.72365546],
[ -3.03521988, -14.44357135],
[ -2.26847919, -13.7140236 ],
[ -2.61172203, -13.24797471],
[ -2.73471401, -13.09054471],
[ -3.19923146, -12.5942653 ],
[ -3.34082546, -12.47611926],
[ -5.67489413, -11.16083338],
[ -5.95159272, -11.10547884],
[ -6.42394023, -11.05981295],
[ -7.09631023, -11.95187806],
[ -7.30641519, -12.24559977],
[ -7.04016696, -12.88580702],
[ -6.00347705, -13.75912098],
[ -4.42442296, -14.74641176]])
</pre></div>
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</div>
</div>
<div class="cell docutils container">
<div class="cell_input docutils container">
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">t</span> <span class="o">=</span> <span class="p">[</span><span class="nb">str</span><span class="p">(</span><span class="n">x</span><span class="p">)</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">pm_vertices</span><span class="o">.</span><span class="n">flatten</span><span class="p">()]</span>
<span class="nb">len</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>32
</pre></div>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">pm_point_list</span> <span class="o">=</span> <span class="s1">&#39;, &#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
<span class="n">pm_point_list</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>&#39;-4.050371212154984, -14.75623260987968, -3.4198108491382455, -14.723655456335619, -3.035219883740934, -14.443571352854612, -2.268479190206636, -13.714023598831554, -2.611722027231764, -13.247974712069263, -2.7347140078529106, -13.090544709622938, -3.199231461993783, -12.594265302440828, -3.34082545787549, -12.476119260818695, -5.674894125178565, -11.160833381392624, -5.95159272432137, -11.105478836426514, -6.423940229776128, -11.05981294804957, -7.096310230579248, -11.951878058650085, -7.306415190921692, -12.245599765990594, -7.040166963232815, -12.885807024935527, -6.0034770546523735, -13.759120984106968, -4.42442296194263, -14.7464117578883&#39;
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">phi1_min</span> <span class="o">=</span> <span class="o">-</span><span class="mi">70</span>
<span class="n">phi1_max</span> <span class="o">=</span> <span class="o">-</span><span class="mi">20</span>
<span class="n">phi2_min</span> <span class="o">=</span> <span class="o">-</span><span class="mi">5</span>
<span class="n">phi2_max</span> <span class="o">=</span> <span class="mi">5</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">astropy.units</span> <span class="k">as</span> <span class="nn">u</span>
<span class="n">phi1_rect</span> <span class="o">=</span> <span class="p">[</span><span class="n">phi1_min</span><span class="p">,</span> <span class="n">phi1_min</span><span class="p">,</span> <span class="n">phi1_max</span><span class="p">,</span> <span class="n">phi1_max</span><span class="p">]</span> <span class="o">*</span> <span class="n">u</span><span class="o">.</span><span class="n">deg</span>
<span class="n">phi2_rect</span> <span class="o">=</span> <span class="p">[</span><span class="n">phi2_min</span><span class="p">,</span> <span class="n">phi2_max</span><span class="p">,</span> <span class="n">phi2_max</span><span class="p">,</span> <span class="n">phi2_min</span><span class="p">]</span> <span class="o">*</span> <span class="n">u</span><span class="o">.</span><span class="n">deg</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">gala.coordinates</span> <span class="k">as</span> <span class="nn">gc</span>
<span class="kn">import</span> <span class="nn">astropy.coordinates</span> <span class="k">as</span> <span class="nn">coord</span>
<span class="n">corners</span> <span class="o">=</span> <span class="n">gc</span><span class="o">.</span><span class="n">GD1Koposov10</span><span class="p">(</span><span class="n">phi1</span><span class="o">=</span><span class="n">phi1_rect</span><span class="p">,</span> <span class="n">phi2</span><span class="o">=</span><span class="n">phi2_rect</span><span class="p">)</span>
<span class="n">corners_icrs</span> <span class="o">=</span> <span class="n">corners</span><span class="o">.</span><span class="n">transform_to</span><span class="p">(</span><span class="n">coord</span><span class="o">.</span><span class="n">ICRS</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">point_base</span> <span class="o">=</span> <span class="s2">&quot;</span><span class="si">{point.ra.value}</span><span class="s2">, </span><span class="si">{point.dec.value}</span><span class="s2">&quot;</span>
<span class="n">t</span> <span class="o">=</span> <span class="p">[</span><span class="n">point_base</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">point</span><span class="o">=</span><span class="n">point</span><span class="p">)</span>
<span class="k">for</span> <span class="n">point</span> <span class="ow">in</span> <span class="n">corners_icrs</span><span class="p">]</span>
<span class="n">point_list</span> <span class="o">=</span> <span class="s1">&#39;, &#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
<span class="n">point_list</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>&#39;135.30559858565638, 8.398623940157561, 126.50951508623503, 13.44494195652069, 163.0173655836748, 54.24242734020255, 172.9328536286811, 46.47260492416258&#39;
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">query_base</span> <span class="o">=</span> <span class="s2">&quot;&quot;&quot;SELECT </span>
<span class="si">{columns}</span><span class="s2"></span>
<span class="s2">FROM gaiadr2.gaia_source</span>
<span class="s2">WHERE parallax &lt; 1</span>
<span class="s2"> AND bp_rp BETWEEN -0.75 AND 2 </span>
<span class="s2"> AND 1 = CONTAINS(POINT(ra, dec), </span>
<span class="s2"> POLYGON(</span><span class="si">{point_list}</span><span class="s2">))</span>
<span class="s2">&quot;&quot;&quot;</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">columns</span> <span class="o">=</span> <span class="s1">&#39;source_id, ra, dec, pmra, pmdec, parallax, parallax_error, radial_velocity&#39;</span>
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<p><strong>Exercise 1:</strong> Use <code class="docutils literal notranslate"><span class="pre">format</span></code> to format <code class="docutils literal notranslate"><span class="pre">query_base</span></code> and define <code class="docutils literal notranslate"><span class="pre">query</span></code>, filling in the values of <code class="docutils literal notranslate"><span class="pre">columns</span></code> and <code class="docutils literal notranslate"><span class="pre">point_list</span></code>.</p>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">query</span> <span class="o">=</span> <span class="n">query_base</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">columns</span><span class="o">=</span><span class="n">columns</span><span class="p">,</span> <span class="n">point_list</span><span class="o">=</span><span class="n">point_list</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="nb">print</span><span class="p">(</span><span class="n">query</span><span class="p">)</span>
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>SELECT
source_id, ra, dec, pmra, pmdec, parallax, parallax_error, radial_velocity
FROM gaiadr2.gaia_source
WHERE parallax &lt; 1
AND bp_rp BETWEEN -0.75 AND 2
AND 1 = CONTAINS(POINT(ra, dec),
POLYGON(135.30559858565638, 8.398623940157561, 126.50951508623503, 13.44494195652069, 163.0173655836748, 54.24242734020255, 172.9328536286811, 46.47260492416258))
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<p><strong>Exercise 2:</strong> Modify <code class="docutils literal notranslate"><span class="pre">query_base</span></code> by adding a new clause to select stars whose coordinates of proper motion, <code class="docutils literal notranslate"><span class="pre">pmra</span></code> and <code class="docutils literal notranslate"><span class="pre">pmdec</span></code>, fall within the polygon defined by <code class="docutils literal notranslate"><span class="pre">pm_point_list</span></code>.</p>
<div class="cell docutils container">
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">query_base</span> <span class="o">=</span> <span class="s2">&quot;&quot;&quot;SELECT </span>
<span class="si">{columns}</span><span class="s2"></span>
<span class="s2">FROM gaiadr2.gaia_source</span>
<span class="s2">WHERE parallax &lt; 1</span>
<span class="s2"> AND bp_rp BETWEEN -0.75 AND 2 </span>
<span class="s2"> AND 1 = CONTAINS(POINT(ra, dec), </span>
<span class="s2"> POLYGON(</span><span class="si">{point_list}</span><span class="s2">))</span>
<span class="s2"> AND 1 = CONTAINS(POINT(pmra, pmdec), </span>
<span class="s2"> POLYGON(</span><span class="si">{pm_point_list}</span><span class="s2">))</span>
<span class="s2">&quot;&quot;&quot;</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">query</span> <span class="o">=</span> <span class="n">query_base</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">columns</span><span class="o">=</span><span class="n">columns</span><span class="p">,</span>
<span class="n">point_list</span><span class="o">=</span><span class="n">point_list</span><span class="p">,</span>
<span class="n">pm_point_list</span><span class="o">=</span><span class="n">pm_point_list</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="nb">print</span><span class="p">(</span><span class="n">query</span><span class="p">)</span>
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>SELECT
source_id, ra, dec, pmra, pmdec, parallax, parallax_error, radial_velocity
FROM gaiadr2.gaia_source
WHERE parallax &lt; 1
AND bp_rp BETWEEN -0.75 AND 2
AND 1 = CONTAINS(POINT(ra, dec),
POLYGON(135.30559858565638, 8.398623940157561, 126.50951508623503, 13.44494195652069, 163.0173655836748, 54.24242734020255, 172.9328536286811, 46.47260492416258))
AND 1 = CONTAINS(POINT(pmra, pmdec),
POLYGON(-4.050371212154984, -14.75623260987968, -3.4198108491382455, -14.723655456335619, -3.035219883740934, -14.443571352854612, -2.268479190206636, -13.714023598831554, -2.611722027231764, -13.247974712069263, -2.7347140078529106, -13.090544709622938, -3.199231461993783, -12.594265302440828, -3.34082545787549, -12.476119260818695, -5.674894125178565, -11.160833381392624, -5.95159272432137, -11.105478836426514, -6.423940229776128, -11.05981294804957, -7.096310230579248, -11.951878058650085, -7.306415190921692, -12.245599765990594, -7.040166963232815, -12.885807024935527, -6.0034770546523735, -13.759120984106968, -4.42442296194263, -14.7464117578883))
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">astroquery.gaia</span> <span class="kn">import</span> <span class="n">Gaia</span>
<span class="n">job</span> <span class="o">=</span> <span class="n">Gaia</span><span class="o">.</span><span class="n">launch_job_async</span><span class="p">(</span><span class="n">query</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">job</span><span class="p">)</span>
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>Created TAP+ (v1.2.1) - Connection:
Host: gea.esac.esa.int
Use HTTPS: True
Port: 443
SSL Port: 443
Created TAP+ (v1.2.1) - Connection:
Host: geadata.esac.esa.int
Use HTTPS: True
Port: 443
SSL Port: 443
INFO: Query finished. [astroquery.utils.tap.core]
&lt;Table length=7346&gt;
name dtype unit description n_bad
--------------- ------- -------- ------------------------------------------------------------------ -----
source_id int64 Unique source identifier (unique within a particular Data Release) 0
ra float64 deg Right ascension 0
dec float64 deg Declination 0
pmra float64 mas / yr Proper motion in right ascension direction 0
pmdec float64 mas / yr Proper motion in declination direction 0
parallax float64 mas Parallax 0
parallax_error float64 mas Standard error of parallax 0
radial_velocity float64 km / s Radial velocity 7295
Jobid: 1605731697505O
Phase: COMPLETED
Owner: None
Output file: async_20201118153457.vot
Results: None
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">candidate_table</span> <span class="o">=</span> <span class="n">job</span><span class="o">.</span><span class="n">get_results</span><span class="p">()</span>
<span class="nb">type</span><span class="p">(</span><span class="n">candidate_table</span><span class="p">)</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>astropy.table.table.Table
</pre></div>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">x</span> <span class="o">=</span> <span class="n">candidate_table</span><span class="p">[</span><span class="s1">&#39;ra&#39;</span><span class="p">]</span>
<span class="n">y</span> <span class="o">=</span> <span class="n">candidate_table</span><span class="p">[</span><span class="s1">&#39;dec&#39;</span><span class="p">]</span>
<span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">,</span> <span class="s1">&#39;ko&#39;</span><span class="p">,</span> <span class="n">markersize</span><span class="o">=</span><span class="mf">0.3</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlabel</span><span class="p">(</span><span class="s1">&#39;ra (deg ICRS)&#39;</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylabel</span><span class="p">(</span><span class="s1">&#39;dec (deg ICRS)&#39;</span><span class="p">);</span>
</pre></div>
</div>
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<img alt="_images/pilot_day3_64_0.png" src="_images/pilot_day3_64_0.png" />
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">pyia</span> <span class="kn">import</span> <span class="n">GaiaData</span>
<span class="k">def</span> <span class="nf">make_dataframe</span><span class="p">(</span><span class="n">table</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Transform coordinates from ICRS to GD-1 frame.</span>
<span class="sd"> </span>
<span class="sd"> table: Astropy Table</span>
<span class="sd"> </span>
<span class="sd"> returns: Pandas DataFrame</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">gaia_data</span> <span class="o">=</span> <span class="n">GaiaData</span><span class="p">(</span><span class="n">table</span><span class="p">)</span>
<span class="n">c_sky</span> <span class="o">=</span> <span class="n">gaia_data</span><span class="o">.</span><span class="n">get_skycoord</span><span class="p">(</span><span class="n">distance</span><span class="o">=</span><span class="mi">8</span><span class="o">*</span><span class="n">u</span><span class="o">.</span><span class="n">kpc</span><span class="p">,</span>
<span class="n">radial_velocity</span><span class="o">=</span><span class="mi">0</span><span class="o">*</span><span class="n">u</span><span class="o">.</span><span class="n">km</span><span class="o">/</span><span class="n">u</span><span class="o">.</span><span class="n">s</span><span class="p">)</span>
<span class="n">c_gd1</span> <span class="o">=</span> <span class="n">gc</span><span class="o">.</span><span class="n">reflex_correct</span><span class="p">(</span>
<span class="n">c_sky</span><span class="o">.</span><span class="n">transform_to</span><span class="p">(</span><span class="n">gc</span><span class="o">.</span><span class="n">GD1Koposov10</span><span class="p">))</span>
<span class="n">df</span> <span class="o">=</span> <span class="n">table</span><span class="o">.</span><span class="n">to_pandas</span><span class="p">()</span>
<span class="n">df</span><span class="p">[</span><span class="s1">&#39;phi1&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">c_gd1</span><span class="o">.</span><span class="n">phi1</span>
<span class="n">df</span><span class="p">[</span><span class="s1">&#39;phi2&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">c_gd1</span><span class="o">.</span><span class="n">phi2</span>
<span class="n">df</span><span class="p">[</span><span class="s1">&#39;pm_phi1&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">c_gd1</span><span class="o">.</span><span class="n">pm_phi1_cosphi2</span>
<span class="n">df</span><span class="p">[</span><span class="s1">&#39;pm_phi2&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">c_gd1</span><span class="o">.</span><span class="n">pm_phi2</span>
<span class="k">return</span> <span class="n">df</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">candidate_df</span> <span class="o">=</span> <span class="n">make_dataframe</span><span class="p">(</span><span class="n">candidate_table</span><span class="p">)</span>
<span class="n">candidate_df</span><span class="o">.</span><span class="n">shape</span>
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<div class="output text_plain highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>(7346, 12)
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">x</span> <span class="o">=</span> <span class="n">candidate_df</span><span class="p">[</span><span class="s1">&#39;phi1&#39;</span><span class="p">]</span>
<span class="n">y</span> <span class="o">=</span> <span class="n">candidate_df</span><span class="p">[</span><span class="s1">&#39;phi2&#39;</span><span class="p">]</span>
<span class="n">plt</span><span class="o">.</span><span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">,</span> <span class="s1">&#39;ko&#39;</span><span class="p">,</span> <span class="n">markersize</span><span class="o">=</span><span class="mf">0.3</span><span class="p">,</span> <span class="n">alpha</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">xlabel</span><span class="p">(</span><span class="s1">&#39;phi1 (deg GD1)&#39;</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">ylabel</span><span class="p">(</span><span class="s1">&#39;phi2 (deg GD1)&#39;</span><span class="p">);</span>
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<p><strong>Exercise</strong> Write <code class="docutils literal notranslate"><span class="pre">candidate_df</span></code> to an HDF file named <code class="docutils literal notranslate"><span class="pre">gd1_candidates</span></code>.</p>
<p>Save it as a dataset named <code class="docutils literal notranslate"><span class="pre">candidate_df</span></code>.</p>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">candidate_df</span><span class="o">.</span><span class="n">to_hdf</span><span class="p">(</span><span class="s1">&#39;gd1_candidates.hdf&#39;</span><span class="p">,</span> <span class="s1">&#39;candidate_df&#39;</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="o">!</span>ls -lh gd1_candidates.hdf
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>-rw-rw-r-- 1 downey downey 756K Nov 18 15:54 gd1_candidates.hdf
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">candidate_df</span><span class="o">.</span><span class="n">to_csv</span><span class="p">(</span><span class="s1">&#39;gd1_candidates.csv&#39;</span><span class="p">)</span>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="o">!</span>ls -lh gd1_candidates.csv
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>-rw-rw-r-- 1 downey downey 1.6M Nov 18 15:51 gd1_candidates.csv
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="o">!</span>head gd1_candidates.csv
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>,source_id,ra,dec,pmra,pmdec,parallax,parallax_error,radial_velocity,phi1,phi2,pm_phi1,pm_phi2
0,635559124339440000,137.58671691646745,19.1965441084838,-3.770521900009566,-12.490481778113859,0.7913934419894347,0.2717538145759051,,-59.63048941944396,-1.21648525150429,-7.3613627125974945,-0.5926328820644919
1,635860218726658176,138.5187065217173,19.09233926905897,-5.941679495793577,-11.346409129876392,0.30745551377348623,0.19946557779138105,,-59.247329893833296,-2.0160784008206476,-7.52712608464053,1.7487794924176672
2,635674126383965568,138.8428741026386,19.031798198627634,-3.8970011609340207,-12.702779525389634,0.7794631695848825,0.22369151932421705,,-59.13339098769217,-2.3069007451798287,-7.560607655557421,-0.7417999555980245
3,635535454774983040,137.8377518255436,18.864006786112604,-4.335040664412791,-14.492308604905652,0.31451429349160354,0.10277456217796248,,-59.78529963350303,-1.5945692849622026,-9.35753561702402,-1.2184922339592716
4,635497276810313600,138.0445160213759,19.00947118796605,-7.1729306406216615,-12.291499169815987,0.42540354480291037,0.3376892347379532,,-59.55774434692722,-1.6821467937242753,-9.000831056712947,2.3344066165829673
5,635614168640132864,139.59219748145836,18.807955539071433,-3.309602916796381,-13.708904908478631,0.5833821573394844,0.5746175895352217,,-58.938113464510934,-3.0241923218278397,-8.062761531706451,-1.8690819375362338
6,635821843194387840,139.88094034815086,19.62185456718988,-6.544201177153814,-12.55978220563274,0.3788707393484704,0.2134264091820104,,-58.10569437830526,-2.8105428528649257,-8.814581159026405,1.451032881430119
7,635551706931167104,138.04665586038192,19.248909662830798,-6.224595114220405,-12.224246333795001,0.7832805254544403,0.12699359319614956,,-59.354285349557074,-1.5557649698784075,-8.427716582116249,1.5738026079151446
8,635518889086133376,137.2374229207837,18.7428630711791,-3.3186800714801046,-12.710314902969365,0.17932476739336733,0.7503378631682915,,-60.19048364007102,-1.1779749872253444,-7.3401827273605385,-1.064062501817137
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