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[vsnet-campaign-v4641sgr 174] Re: [vsnet-chat 6236] Re: V4641 Sgr, Discrepance between Visual and CCDV mags

Date: Fri, 18 Apr 2003 05:47:51 EDT
To: tkato@kusastro.kyoto-u.ac.jp,vsnet-campaign-v4641sgr@ooruri.kusastro.kyoto-u.ac.jp,vsnet-chat@ooruri.kusastro.kyoto-u.ac.jp
From: DWest61506@aol.com
Subject: [vsnet-campaign-v4641sgr 174] Re: [vsnet-chat 6236] Re: V4641 Sgr, Discrepance between Visual and CCDV mags
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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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