[vsnet-chat 2384] sn1999em field photometry

[aah@nofs.navy.mil]

Comparing my photometry (posted on
http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/sn1999em.dat
and which is calibrated to the Longo & de Vaucouleurs
star GSC 4739-0434 as suggested by Brian Skiff in
vsnet-alert 3641) with the AAVSO e-chart recently posted,
I find the following cross-identifications:

AAVSO   RA (J2000)   DEC     V     B-V    V-R    R-I    verr   bverr  vrerr  rierr
156   70.435653  -2.826740 15.607  0.693  0.457  0.522  0.008  0.011  0.012  0.012
149   70.415492  -2.827597 14.827  0.804  0.518  0.530  0.004  0.006  0.006  0.006
124   70.385255  -2.828323 12.348  1.225  0.743  0.716  0.001  0.002  0.001  0.001
130   70.375277  -2.802058 12.966  1.169  0.709  0.660  0.002  0.003  0.003  0.002
139   70.333462  -2.801708 14.280  0.667  0.460  0.469  0.003  0.004  0.005  0.006
144   70.322328  -2.780420 13.748  0.848  0.586  0.544  0.002  0.004  0.003  0.003
138   70.343468  -2.759978 13.865  0.717  0.523  0.531  0.003  0.004  0.004  0.004
142   70.351988  -2.764640 13.566  0.876  0.622  0.611  0.002  0.003  0.003  0.003
112   70.367945  -2.756028 10.875  0.356  0.445  0.370  0.001  0.001  0.001  0.001
134   70.320543  -2.924902 12.854  0.780  0.460  0.511  0.001  0.002  0.002  0.002

SNe   70.363140  -2.862617 13.732  0.103  0.254  0.184  0.003  0.004  0.005  0.008
(HJD 2451485.867; coords 04:41:27.15 -02:51:45.4); astrometry and photometry
contaminated by underlying galaxy

where the AAVSO star 112 is saturated on my frames and therefore
unreliable, and the listed errors are purely Poisson and do
not include zero point errors.  There seems to be considerable
difference on a number of the stars.
Arne

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