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[vsnet-obs 39970] V4641 sgr Observations

V4641 Sgr observations taken with a 0.20m SCT + ST-9E  CCD + clear filter.  Comparison star TYC 6848 3600 1 V=9.86.  Estimated standard deviation of check star (GSC 6848 3832) measurements = 0.06 magnitude.  The signal-to-noise ratio (SNR) started at approximately 60 and ended the observing session at 20.  The decreasing SNR is due to the increasing airmass and the approaching dawn.  The sky was variable with light passing clouds.

Variable, VSNET date, JD, unfiltered mag, Observer
SGRV4641 20020523.4161  2452417.9161   12.41  JDW
SGRV4641 20020523.4169  2452417.9169   12.65  JDW
SGRV4641 20020523.4177  2452417.9177   12.81  JDW
SGRV4641 20020523.4185  2452417.9185   12.79  JDW
SGRV4641 20020523.4193  2452417.9193   12.93  JDW
SGRV4641 20020523.4200  2452417.9200   12.94  JDW
SGRV4641 20020523.4208  2452417.9208   13.14  JDW
SGRV4641 20020523.4216  2452417.9216   12.99  JDW
SGRV4641 20020523.4224  2452417.9224   13.04  JDW
SGRV4641 20020523.4231  2452417.9231   12.96  JDW
SGRV4641 20020523.4239  2452417.9239   12.93  JDW
SGRV4641 20020523.4247  2452417.9247   12.75  JDW
SGRV4641 20020523.4255  2452417.9255   13.02  JDW
SGRV4641 20020523.4262  2452417.9262   12.69  JDW
SGRV4641 20020523.4270  2452417.9270   12.65  JDW
SGRV4641 20020523.4281  2452417.9281   12.84  JDW
SGRV4641 20020523.4289  2452417.9289   12.86  JDW
SGRV4641 20020523.4297  2452417.9297   12.59  JDW
SGRV4641 20020523.4304  2452417.9304   12.60  JDW
SGRV4641 20020523.4312  2452417.9312   12.93  JDW
SGRV4641 20020523.4320  2452417.9320   12.44  JDW
SGRV4641 20020523.4328  2452417.9328   12.40  JDW
SGRV4641 20020523.4335  2452417.9335   12.46  JDW
SGRV4641 20020523.4343  2452417.9343   12.53  JDW
SGRV4641 20020523.4351  2452417.9351   12.44  JDW
SGRV4641 20020523.4359  2452417.9359   12.44  JDW

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