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<!DOCTYPE HTML>
<html lang="en">
<head>
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<title>Munipack ‒ A Star Chart Tutorial</title>
</head>
<body>
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<section>
<h1>Star Charts</h1>
<p class="abstract">
How to create a star chart from a catalogue provided by Virtual Observatory.
</p>
<h1>Open Cluster NGC 637</h1>
<p>
NGC 637 is an open cluster in Cassiopeia. Stars are distributed
randomly but the look is similar to upside-down silhouette of owl:
Wings are spread and two brighter stars placed to its head suggests
big eyes. The cluster is looking pretty good in a binocular.
</p>
<h2>Catalogue Search</h2>
<p>
To get coordinates of NGC 637, we are searching a selected
catalogue UCAC5 with center α = 25.775° and δ = 64.03°
and the cone radius 0.1°:
</p>
<pre>
$ munipack cone -o ngc637.xml -c UCAC5 -r 0.1 -- 25.775 64.03
</pre>
<p>
All found stars are saved to VOTable (Virtual Observatory transfer table).
</p>
<h2>Plotting</h2>
<p>
The output VOTable can be converted to SVG and be used for drawing of star charts:
</p>
<pre>
$ munipack votable -o ngc637.svg -pa 25.78 -pd 64.03 -ps 2000 -ml 12 \
--col-mag f.mag --col-ra RAJ2000 --col-dec DEJ2000 ngc637.xml
$ firefox ngc637.svg
</pre>
<figure>
<img class="figure" width="400" height="400" src="ngc637.svg" alt="ngc637.svg" title="NGC 637">
<figcaption>Open Cluster NGC 637 (<a href="ngc637.svg">file</a>)</figcaption>
</figure>
<h2>Tips</h2>
<ul>
<li>Best viewed with Internet browsers (Firefox, Chrome).</li>
<li>Try interesting regions like globular clusters, neighborhood of bright galaxies</li>
<li>SVG format is a kind of XML format and can be easy modified: added text descriptions, graphics elements like axes, etc.</li>
<li>The output can be easy included to web pages.</li>
</ul>
<h2>See Also</h2>
<ul>
<li><a href="man_votable.html">VOTable</a></li>
<li><a href="man_cone.html">Cone Search</a></li>
</ul>
</section>
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</body>
</html>
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