Question about Job J28453

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Railwayman
Posts: 6
Joined: Sat Dec 06, 2014 5:02 pm

Question about Job J28453

Postby Railwayman » Thu Feb 19, 2015 2:46 am

I have a question about one of the photos in the Image Gallery, No. J28453 of M31. It's a good photo (not one of mine) and its shows the two half's of the Andromeda galaxy in different colours. I've seen this previously but never understood why. Can anyone suggest a reason?

Thanks, Railwayman
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Ed
Site Admin
Posts: 320
Joined: Wed Sep 21, 2011 2:18 pm

Re: Question about Job J28453

Postby Ed » Thu Feb 19, 2015 11:20 am

Photos such as these are from many years ago. At one point, the CCD in use on cluster cam had a greasy smudge on it. This showed up in the images (particularly in colour images).

The CCD was later sent off for cleaning and the problem was resolved.


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