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#1
March 18th 06, 03:01 AM
posted to sci.astro
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computing I-mag from V-mag, how to?
Hi,
We are interested in star I magnitudes. Hipparcus catalog has V-magnitudes. Is it possible to compute I-magnitudes from V-magnitudes? Is that what the V-I mag field is for? If so, how to use it? Also, what is the ratio of red stars to blue stars (or a good web resources to find out)? Thanks a bunch! 
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