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> >> ...may I recommend HD 93695, a B5 foreground star with > >> values V, B-V, U-B of 6.47, -0.13, -0.60 from ROB 64. There are probably > >> more accurate values now, as well as V-R and R-I, in the literature. > > The data collected at the GCPD suggests these values are as good as > any, and V is confirmed by reliable Stromgren data. No R,I data, > though since the star is little reddened, you could predict them within > a few percent from the UBV colors. Stan and Brian, Yes, this star is included as comparison star in my eta Car chart. I can add that the Observing Group of La Plata Observatory is making CCD BVRI photometry using HD 303308 (V= 8.16, B= 8.30, R= 7.91, I= 7.76) as the comparison star. It is 3 magnitudes fainter but it is quite close. Regards, Sebastian.
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