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Star Charts

How to create a star chart from a catalogue provided by Virtual Observatory.

Open Cluster NGC 637

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.

Catalogue Search

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°:

$ munipack cone -o ngc637.xml -c UCAC5 -r 0.1 25.775 64.03

All found stars are saved to VOTable (Virtual Observatory transfer table).

Plotting

The output VOTable can be converted to SVG and be used for drawing of star charts:

$ 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
ngc637.svg
Open Cluster NGC 637 (file)

Tips

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