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CCD photometry, which star catalogue

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#1 Andreas_Roerig

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Posted 09 February 2013 - 06:58 AM

Hi,

for sime time I have been a watching CN but this is my first post I think.
My question is when it comes to CCD photometry which star catalogue should be used for the reference stars to get the best accuracy?

Best regards
Andreas

#2 rutherfordt

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Posted 09 February 2013 - 08:21 AM

Willkommen, Andreas.

For CCD photometry of variable stars, I would recommend that you use the AAVSO's "Variable Star Plotter (VSP)." (http://www.aavso.org/vsp). This will have the most up to date values for reference stars for whichever variable you are planning on observing. Most observers start off using a "V" filter and I would recommend that, too.

Tom

#3 NJScope

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Posted 09 February 2013 - 10:15 PM

Andreas

I second Rutherfordt's advice, the AAVSO charts are the best place to start looking for reference comparison stars in the same field of view as many variable stars.

#4 Rich (RLTYS)

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Posted 10 February 2013 - 07:27 AM

Andreas, welcome to the CN Variable Star Forum.

Rich (RLTYS)

#5 Ed Wiley

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Posted 10 February 2013 - 02:05 PM

Andreas:

The above responses are correct -- use the AAVSO charts. Many catalogs have magnitudes on different standards or with filters that are designed to produce precise astrometry. For example TychoV is not the same as JohnsonV. The AAVSO charts and associated CCD data have the magnitudes you need. You do not have to be a member to access them.

Ed

#6 Andreas_Roerig

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Posted 11 February 2013 - 04:40 AM

Hi Tom, Kevin, Rich and Ed,

many thanks for your replies.
I will check the AAVSO charts.

Best regards
Andreas






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