![]() ![]() The data that you obtain do not give you much information about the object, apart from its brightness and possibly temperature. Measuring the brightness of a stable and unchanging star is not an exciting thing to do. Aperture photometry basically sums the counts in the “aperture” area and subtracting the mean noise in the background defined in the “sky annulus” area: ![]() When you are doing aperture photometry (from a GUI, at least), you will see something like the following. ![]() The excess pixels in (2) are also known as sky or background, and we will use these two terms interchangeably.
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