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Siril is capable of analysing star photometry across a sequence to do a light curve. See this tutorial for more information on how to proceed. This page is more a technical documentation.
There are a few parameters that drive this, available from preferences.
- inner and outer radius: measuring the magnitude of an object involves measuring the flux of the object and the flux of the background. To sample the background, we must choose pixels that are far away from the object to not contain it, and close enough to be the same background and if possible not contain other objects. An annulus is created with these inner and outer radii, in which background pixels will be sampled
- aperture:
- forcing aperture:
- gain:
- min and max pixel values: