[vsnet-chat 748] Photometry near SN 1998S

["Steve H. Lucas" <76620.1721@compuserve.com>]

Supernovae Collegues:

A photometric sequence of comparison star magnitudes for use in securing  
magnitude estimations of SN1998S near the area of NGC 3877 is presented.
The 
information is gleaned from "The Guide Star Photometric Catalog I."(Lasker
et. al, 
ApJ., Volume 68, #1 "Supplement Series", September, 1988). The finder
chart/area 
is designated P-169 (~2.7 degrees [+/-] away from the host galaxy [star A],
in P.A. 
~268 degrees [+/-], {almost due west from NGC 3877})(Note: The comparison
star coordinates are in epoch 1950. GSC star numbers are also included, if
you prefer to utilize epoch 2000.0 coordinates.

It might also be noteworthy to mention that the GSC rendered magnitudes in
this instance are pretty close to the photometrically measured magnitudes
found in data from the abovementioned work.

Star(GSC#)      RA     (1950.0) Dec             V-Mag.* B-V
____________________________________________________________
A (3451:733)    11h27m10.8s     47d33'36"               8.89    0.96
B (3451:960)    11h26m48.8s     47d35'25"               11.21   0.61
C (3451:444)    11h26m50.9s     47d22'49"               12.49   0.70
D (3451:728)    11h27m48.3s     47d34'03"               13.78   0.59
E (3451:440)    11h26m58.6s     47d36'31"               15.11   0.45
____________________________________________________________
* = no error values indicated in GSPC data are noted here.

Best Regards,

Steve

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