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Beginner Tutorial data anlysis DSLR photometry

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astroptika's picture
astroptika
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Posted: March 11, 2011 - 1:58am

I am attempting to work through the tutorial but I am having trouble finding the instrumental magnitudes for the comparison stars (In a table?).  I am using AIP4WIN for calibration.  That part went fine.  I have the log data on the instrumental magnitudes for the comparison stars and the variable from AIP4WIN and have tried using that data but that can't be correct.  If there is a look up table for values I am having trouble finding it.  Please advise.

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bkloppenborg
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Teams: Citizen Sky Staff, DSLR Documentation and Reduction, Historical Perspectives, Mira Fourier Coefficient Team, VStar Software Development
Posted: March 11, 2011 - 2:58pm

Greetings astroptika, The instrumental magnitudes are the measured values from your camera extracted via. a photometric software package (like AIP4WIN, IRIS or MaximDL). Those values will go into the yellow cells in the Excel spreadsheet. The Catalog values (V Cat, (B-V) Cat, etc) come from a list of known values. For the eps Aur field of view, they can be foundon the Calibration Standards page. You mention above that you tried using those values (I presume in the Beginner calibration spreadsheet). What makes you think this can't be right? Can you attach a table of your values? Thanks, Brian P.S. Did you try out the sample data first or are you using your own images?

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