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Date: Sat, 18 Sep 1993 01:07:27 +1200
From: "Pam Kilmartin & Alan Gilmore, Mt John." <PHYS162@csc.canterbury.ac.nz>
Subject: N Sgr 93 - UBVRI photometry
NOVA SAGITTARII 1993 - UBVRI PHOTOMETRY
The following photometry was obtained in marginal conditions with the 0.6-m
f/16 Cassegrain at Mt John with single-channel photometer No 2, cooled EMI
9202B (S20) pmt, and Johnson-Cousins UBVRcIc filters.
Two sets of differential measures were obtained. The first was against
nearby stars in case the sky quickly clouded. The second was against more
distant Cousins E-region standards E 790 and E 746 and also included the
comparison and check from the first set. Stars were very near the same air
masses in each set.
The results for the nova were, with the standard deviation (s.d.) of two
measures:
U.T V U-B B-V V-R V-I
N Sgr 93 1993 Sep. 17.414 8.59 -0.26 +0.33 +0.42 +1.00
s.d. 0.00 0.05 0.00 0.01 0.12
N Sgr 93 1993 Sep. 17.434 8.57 -0.30 +0.35 +0.40 +0.96
s.d. 0.02 0.01 0.01 0.01 0.04
The nearby provisional comparison and check and their magnitudes and colours
were
SAO V U-B B-V V-R V-I
186445 7.747 -0.080 +0.079 +0.055 +0.16
s.d. 0.000 0.018 0.007 0.002 0.05
186457 9.100 +0.23 +0.297 +0.183 +0.39
0.014 0.03 0.008 0.010 0.04
Note that the standard deviations tell nothing about the likely error in
the absolute calibration. These stars will be remeasured on the the next
photometric night.
Coordinates
SAO R.A. (1950) Dec.
186445 18 08 49.1 -29 35 02
186457 18 09 15.4 -29 22 00
----------------------------------------
Alan Gilmore 1993 September 17 1300 UT
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