Is this a comet?

http://legacysurvey.org/viewer?ra=172.2141&dec=18.2849&zoom=13&layer=sdssco

Well, I’m having a hard time getting the Decals DR3 images to load to get a delta of the two images, but this to me looks more like a comet than a galaxy. If anyone might be able to compare a before/after, that would be appreciated.

It’s still there in the DECaLS DR3 image, so not a comet. My guess is that it’s a low-surface-brightness galaxy, which are also interesting!
cheers,
–dustin

Yeah, it would move even between images in different filters, so you wouldn’t get a white image in the 3-color.

Joe