Why does this have rainbow colo(u)rs on the sides?


That’s where we got some but not all of the red/green/blue filters. In these images, we collect one band at a time, so to get color images we have to take three separate exposures. At the edges, we didn’t always do this!

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Wow! Thank you so much.

why not? Also, why are there different amounts of each color in different parts of the sky, , for example I can see normal color in one place, then somewhere else one color is saturated more than the others?

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The way telescope time is awarded (we had to apply for time to do this program, and it’s always highly competitive), we would get awarded a block of nights – usually 2-6 nights or half-nights in a row. We did g- and r-band during dark time (moon down) and z-band when the moon was up, so getting 3-band coverage requires good weather when that part of the sky was visible on dark and bright nights. Getting it perfect would be more trouble than it would be worth.

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