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Date: Sat, 20 Nov 1993 15:13:29 +1300
From: "Pam Kilmartin & Alan Gilmore, Mt John." <PHYS162@csc.canterbury.ac.nz>
Subject: N Sgr 1993 photometry
NOVA SAGITTARII 1993
Below are means of two differential measures obtained with the 0.6 f/14
Cassegrain at Mt John with single-channel photometer No. 2, cooled EMI
9558B (S20) pmt, and Johnson-Cousins UBVRcIc filters. All measures were
made differentially from SAO 186445; its assumed magnitude and colours are
listed below. Conditions were marginal on Oct. 25.
U.T. J.D. V U-B B-V V-R V-I Air Mass
N Sgr 93 1993 Oct. 24.43 9284.93 11.57 -0.43 +0.06 +1.31 +1.4 2.57
0.02 0.01 0.04 0.01 0.3
Oct. 25.42 9285.92 11.67 -0.45 +0.16 +1.35 +1.1 2.31
0.01 0.04 0.01 0.02 0.1
Oct. 28.40 9288.90 11.94 -0.55 +0.16 +1.56 - 2.00
0.03 0.05 0.02 0.01
COMPARISON STARS
Comparison stars on Mati Morel's chart (Variable Star Memorandum No. 34,
1993 Sep. 29) were measured but at high air masses. Stars A-H were measured
on Oct. 25, in marginal conditions. Stars G-K were measured on Oct. 28 in
good conditions. All measures were relative to SAO 186445, star '77' on
Morel's chart. A summary of all comparison star measures follows.
Offset
from nova
Star SAO 1993 U.T. V U-B B-V V-R V-I Air Mass
77 10.7W 5.2S 186445 Sep. 17.4 7.747 -0.080 +0.079 +0.055 +0.16 1.38
s.d. 0.000 0.018 0.007 0.002 0.05
A 2.0E 6.3S Oct. 25.4 9.14 - +1.55 +0.82 - 2.77
0.01 0.00 0.02
B 5.8W 1.1N 186455 Sep. 27.4 9.31 -0.12 +0.08 +0.05 +0.17 1.35
0.00 0.01 0.01 0.00 0.01
C91 5.0W 7.0N 186457 Sep. 17.4 9.10 +0.23 +0.30 +0.18 +0.39 1.40
0.01 0.03 0.01 0.01 0.04
D 2.7W 2.9S Oct. 25.4 10.22 - +1.16 +0.63 - 2.92
0.06 0.04 0.04
E 1.0W 0.2S Oct. 25.4 9.82 - +1.63 +0.91 - 3.21
0.05 0.00 0.03
F 2.7W 1.0S Oct. 25.4 10.85 - +0.26 +0.18 - 3.53
0.03 0.01 0.00
G 0.5E 0.7S Oct. 25.4 10.87 - +1.12 +0.68 - 3.90
0.01 0.01 0.01
Oct. 28.4 10.83 - +1.24 +0.65 2.64
0.02 0.02 0.01 -
Weighted mean 10.84 +1.19 +0.66
H 2.5E 4.2N Oct. 25.4 11.55 - +0.28 - - 4.59
0.03 0.05
Oct. 28.4 11.43 - +0.43 +0.22 - 2.89
0.01 0.00 0.02
Weighted mean 11.45 - +0.41 +0.22
I 2.4W 0.6N Oct. 28.4 11.7 - +1.3 - - 3.28
0.1 0.1
K 0.9E 1.3S Oct. 28.4 12.21 - +1.64 - - 3.73
0.02 0.01
Not yet measured (Next year?) L 3.3W 1.3N, M 1.0E 0.4N, N 1.4W 1.1N,
O 1.6E 1.3S
Alan Gilmore 1993 October 20
P.S. Comparison star offsets in minutes of arc.
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