Green circle

• by Thamishan

  Hello,

  I just came across this picture with a green circle beneith the galaxy. Anyone any idea what it could be?

  Thank you

  Posted November 25, 2013 6:49 PM

• by JeanTate in response to Thamishan's comment.

  I don't know for sure, but I think it's a 'ghost': a kind of artifact that is produced by reflection of light from a bright star within the optics of the telescope/camera.

  In a zoomed-out SDSS image, you can see there's a really bright star that may be in the right place to produce such a ghost:

  

  Posted November 25, 2013 7:24 PM