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Date: Mon, 10 May 93 21:44 GMT
From: Guy M Hurst <GMH@ASTROPHYSICS.STARLINK.RUTHERFORD.AC.UK>
Subject: SN1993J Daily Means
Ref:m930510a.wps
To: Nova Network/Mark Kidger/Gary Poyner
Re: Supernova 1993J in NGC 3031
Update on the database of 'The Astronomer and BAA', UK
I have derived the following daily means and supplementary
data from the 466 visual observations logged to date:
JD Mean No of Max Min Scatter Notes
Mean Mag Obs Mag Mag
2449000+
75 11.60 2 11.40 11.80 0.40
76 11.10 5 10.80 11.30 0.50
77 10.48 18 10.00 11.00 1.00 First maximum?
78 10.49 18 10.00 10.80 0.80
79 10.67 18 10.40 11.20 0.80
80 11.31 32 10.50 12.10 1.60
81 11.47 15 11.00 11.90 0.90
82 11.54 7 10.80 11.80 1.00
83 11.97 19 11.60 12.20 0.60 First minimum?
84 11.80 22 11.20 12.10 0.90
85 11.69 10 11.40 12.00 0.60
86 11.57 18 10.90 12.00 1.10
87 11.51 26 10.90 11.90 1.00
88 11.39 19 10.90 11.70 0.80
89 11.30 9 10.90 11.80 0.90
90 11.17 18 10.50 11.70 1.20
91 11.06 13 10.50 11.30 0.80
92 11.07 21 10.50 11.70 1.20
93 10.87 20 10.40 11.30 0.90
94 10.72 5 10.60 10.80 0.20 Secondary maximum?
95 10.73 19 10.50 11.10 0.60
96 10.82 5 10.60 11.20 0.60
97 10.95 14 10.60 11.60 1.00
98 11.14 9 10.80 11.40 0.60
99 10.88 13 10.50 11.40 0.90
100 11.21 7 10.80 11.50 0.70
101 11.20 4 10.60 11.50 0.90
102 11.22 9 10.80 11.50 0.70
103 11.52 9 11.00 11.90 0.90
104 11.61 17 11.00 12.10 1.10
105 11.78 14 11.50 12.00 0.50
106 11.78 6 11.60 11.90 0.30
107 11.97 6 11.70 12.10 0.40
108 12.05 6 12.00 12.10 0.10
109 12.17 3 12.10 12.30 0.20
110 12.10 2 12.10 12.10 0.00
111 12.10 1 12.10 12.10 0.00
112 12.20 2 12.10 12.30 0.20
113 12.50 1 12.50 12.50 0.00
114 12.50 2 12.30 12.70 0.40
115 12.65 2 12.40 12.90 0.50
(Above is an extract from 'The Astronomer' Vol 30 No 349 p13 [1993]
currently in press)
Additional comments:
As star 'D' was used for more than 50% of the observations I wonder
if its variation is responsible for the larger than expected scatter
in these visual results. Typically 0.5 is common for stars which are
not strongly coloured but some nights above the difference between
the brightest and faintest estimates exceeds 1.0 magnitudes.
Although rapid fluctation in the supernova is possible, is it more
likely that star D is some form of eclipsing star which has caused
a false impression of variability in the supernova on certain nights?
Guy M Hurst
Editor, The Astronomer
1993 May 10
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