[Aavso-photometry] Transforming

[Barbara G. Harris]

I have been doing CCD photometry of variable stars for about 2-3 years now
primarily with the V filter.  I do have a complete set of photometric
filters.  One of my New Year’s resolutions was to obtain my transformation
coefficients.  I am sort of learning as I go.  I found Lou Cohen’s paper on
how to calculate transformation coefficients and so far I have imaged M67 in
B,V,R, and I.   I have followed his instructions and calculated my
transformation coefficients.

 

My next step is to apply these coefficients to my observations.  I am still
a little lost in this area.  My question is if I image a star through a V
filter, how many other colors (at a minimum) do I need of that star to
transform the V estimate?  Also can someone point me to additional reading
on applying transformation coefficients?

 

Thanks,

Barbara Harris (HBB)


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