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[vsnet-chat 6239] Re: V4641 Sgr, Discrepance between Visual and CCDV mags

Taichi:
I need to clarify my previous e-mail.  There is a ~0.4 mag zero point difference between the AAVSO chart and the Henden/Sumner magnitudes, not between Henden and Henden/Sumner magnitudes.  The AAVSO chart 1813-25e does not reference Henden/Sumner photometry.
Regards,
Doug


In a message dated 4/17/2003 8:07:33 PM Central Standard Time, tkato@kusastro.kyoto-u.ac.jp writes:


   (??)  I wonder why there was a so large (0.4 mag) difference betwen
"Henden photometry" and "Henden/Sumner photometry", which must have been
derived from the same photometric material?

   I also noticed that there were several CCD estimates in the past which
were systematically fainter than visual observations.  I don't think
all these observers used the AAVSO chart; there may have been a common
origin of zero-point mistake.

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