This guide will take you through the steps you need to do basic photometry. Photometry is useful for projects where you need to measure the amount of light coming from a star or other celestial object. These projects include open clusters, supernovae, planet transits and many others. You can do
this with sample data available from the
public archive, or with
data from your own observations if you have an account. After doing this
activity you should be able to:
* Use SalsaJ to measure the brightness of stars in an image
* Describe how to choose an appropriate radius to use for photometry in SalsaJ
This article is background information relevant to several other projects.
You will find that the text contains many links. Some will take you
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guide first, then go back and follow links that interest you, or you
may want to follow links as you go along. You can also click on the
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