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winter-telescope / mirar

Modular Image Reduction and Analysis Resource (MIRAR)
MIT License
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[FEATURE] Carefully decide what images get used for WINTER flats #619

Closed virajkaram closed 5 months ago

virajkaram commented 1 year ago

Is your feature request related to a problem? Please describe. WINTER flat-fielding happens with images that don't necessarily have a large numbers of counts. Looks like the dark counts vary on a level of few hundreds. If the sky counts in the flats are ~2000, this means that our winter frames would never be calibrated better than 10% (min. uncertainty is 0.1 mag, before including any other effects). This is very suboptimal.

Describe the solution you'd like We should set a threshold on the median number of counts in an image that should be used for flat-fielding, to improve the quality of reductions. This would probably translate to only using frames taken earlier during the evening. On an astro-note, we should probably be taking twilight flats.

robertdstein commented 5 months ago

I think this has been somewhat superseded by dome flats. See #835 instead.