[vsnet-chat 1850] Re: [vsnet-chart 151] Chart of SN1999by

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

Re: [vsnet-chart 151] Chart of SN1999by

>      Was the BVRI sequence I sent out earlier not suitable for getting as
> better zero-point in the NGC 2841 field using USNO-A stars?

I have been compiled GSC and USNO mags for stars in Brian's list. 

Name         GSC          V    B-V   V-R   V-I  GSC_V   U_r  U_b
NGC 2841 1   3431-0219   8.48  1.29  0.67  1.23  8.20   8.1  0.0
NGC 2841 2   3431-0625  11.07  0.59  0.33  0.65 10.59  13.0 12.6
NGC 2841 3Ts 3431-0388  12.62  0.64 (0.37)      13.00  12.9 14.4
NGC 2841 3   3431-0053  13.51  0.75  0.43  0.83 13.32  13.3 15.2
NGC 2841 4   3431-0495  13.77  0.60  0.40  0.74 13.84   ---  ---
NGC 2841 5   3431-0159  14.19  0.83  0.42  0.91 13.97  14.0 16.1
NGC 2841 147 3431-0802  14.72  0.88             14.29  14.0 16.1

 (NGC 2841 4 is located well inside of the disk of NGC 2841, so USNO
catalog missed it.)

USNO mag seems not to gleatly differ except NGC 2841 2 star (it is on
the edge of NGC 2841), but I agree that observers should use Brian's
list as comparison.

Hitoshi

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