Another (ruined-by-imaging) comet

https://www.legacysurvey.org//viewer/?ra=194.2029&dec=2.0033&layer=ls-dr10-grz&zoom=14

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Is it because the dr7 images are older, that the rocky thing isn’t visible on those images? Probably a noob question, sorry for that. Have a wonderful day all. Grtz

The dark spot in the middle is due to a step in the image processing called ‘outlier rejection’ where we try to ignore parts of the sky that are changing – because the Legacy Surveys mostly care about distant galaxies. If it was working perfectly we would have masked out (ignored) the whole red comet!

DR7 was before we started doing the outlier rejection, so this comet shows up unblemished there.

The images it appears in were taken on 2015-03-30, eg:
https://www.legacysurvey.org/viewer/ccd/ls-dr10/decam-426127-N31.xhtml?rect=1208,2936,100,100

cheers,
dustin

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