UGFL SPOTTED!! Unidentified Green Fruit Loop

Can anyone say what this is?

Posted January 9, 2014 8:05 AM

That green circle is an optical artifact.Don't know what causes it though.

Posted January 9, 2014 1:01 PM

by KWillett scientist, admin, translator

I think it's most likely an actual physical artifact (speck of dust or something) on the detector; the elongated shape comes from the distorted optics of something in the extreme near field, which the camera isn't designed to focus on. This is from the Y-band imaging, which is the red channel in the color images; it shows up in green and blue due to our sky subtraction algorithm.

Here's the raw troublesome image in Y-band (image isn't displaying in Talk, for some reason...):

enter image description here

http://imgur.com/SjHB3kk

Posted May 25, 2014 5:03 PM

by ElisabethB moderator

Here it is ! 😄

enter image description here

Posted May 25, 2014 5:17 PM

by KWillett scientist, admin, translator

Thanks, @ElisabethB ! I don't at all know why image posting wasn't working for me.

I've discussed this object and a few other common artifacts in the UKIDSS infrared images on a recent blog post, btw. http://blog.galaxyzoo.org/2014/05/25/images-and-artifacts-in-galaxy-zoo-ukidss/

Posted May 25, 2014 5:33 PM

by ElisabethB moderator in response to KWillett's comment.

Tx for the explanations ! 😄

Posted May 25, 2014 8:18 PM

by JeanTate

My thanks too.

Dust eh? How boring ... I think green fruit loops would have been soooo much more exciting! 😉 (<- that's a 'wink' smilie, in case you missed it!)

Posted May 26, 2014 4:48 AM