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star positions


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I'm sure you all know this but I thought I'd mention it anyway. I got some comparison star references from the AAVSO website and cross referenced it with simbad but when I tried to cross reference that with carte du ciel I found that the coordinate of the stars were all slightly off. I started writing a long winded post here but then I had an idea.  It turned out that the problem was because carte du ciel was using a different coordinate system to either the AAVSO or Simbad site which both said J2000. CDC was set up for "apparent" which I think must be the default since I'd never set this. When I set CDC up for astrometric J2000 - bingo! they all matched. 

Hope this is useful to someone.

 

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