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SalsaJ (Until further notice, please download version 1.4, not version 2.0, which does not yet have full photometry features.)
(Aperture Photometry Tool) are both free java based photometry software
packages you can install on your computer to use for this project and
any project that uses photometry. SalsaJ is a bit simpler and does more
of the work for you, but you have more control over settings using APT.
The two screencasts below will take you through the steps you need to learn how to use SalsaJ for photometry.
Part 1 shows how to choose a star radius and a sky radius and set them so you will get the most accurate results from your photometry. (The button on the bottom right of the video will make it full-screen.)
Part 2 shows how to use SalsaJ to find the brightness of
different stars or objects in your image and what the various tools in
SalsaJ are for.