Question about Job J28453

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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
M31.jpg (300.16 KiB) Viewed 1696 times

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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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