Central Bureau for Astronomical Telegrams
IAUC 3794: SN IN NGC 4753; 1982d
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Circular No. 3794
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
SUPERNOVA IN NGC 4753
H. G. Corwin, Jr., University of Texas at Austin, reports the
following data, obtained with the 0.76-m telescope at McDonald
Observatory: Apr. 14.242 UT, V = 12.83, B-V = +0.44, U-B = +0.21,
V-R = +0.10, R-I = -0.26; Apr. 16.337, V = 12.95, B-V = +0.53, U-B
= +0.31, V-R = +0.06, R-I = -0.36. Standard Johnson UBV and Kron-
Cousins RI filters were used with an EMI 9658R extended S-20
photomultiplier. Because the background near the supernova is bright
(B magnitudes: 21.3 mag arcsec**-2 measured, 21.0 mag arcsec**-2
estimated from the magnitude-aperture relation for the galaxy), these
data may be uncertain by up to +/- 0.1 mag. Nonetheless, the colors
and rate of decline are consistent with those for type I
supernovae 12 to 15 days past maximum.
E. P. Aksenov, Sternberg Astronomical Institute, communicates
the independent discovery of this object by Tsvetkov on Apr. 9.903
UT at mpg 13.4. Further visual magnitude estimates: Apr. 11.22
UT, 12.7 (T. Fetterman, Bridgewater, NJ); 15.22, 12.9 (C. Spratt,
Victoria, BC); 17.22, 13.2 (Spratt).
PERIODIC COMET TEMPEL 2 (1982d)
The following ephemeris is from MPC 7375 (elements on IAUC
3676), except that the magnitudes are total values, derived from a
formula by C. S. Morris, Harvard, MA.
1983 ET R.A. (1950.0) Decl. p r m1
May 6 22 17.64 - 8 30.6 1.362 1.411 12.7
16 22 51.36 - 6 55.5
26 23 24.60 - 5 21.4 1.262 1.383 11.7
June 5 23 57.02 - 3 52.9
15 0 28.25 - 2 34.6 1.193 1.389 9.8
25 0 57.90 - 1 30.4
July 5 1 25.63 - 0 43.4 1.142 1.427 10.1
15 1 51.07 - 0 15.7
25 2 13.85 - 0 08.7 1.098 1.494 10.6
Aug. 4 2 33.63 - 0 22.5
14 2 50.01 - 0 57.0 1.054 1.584 11.1
24 3 02.58 - 1 50.4
Sept. 3 3 11.02 - 2 59.9 1.013 1.690 11.8
13 3 14.97 - 4 21.3
23 3 14.36 - 5 47.4 0.989 1.807 12.5
1983 April 29 (3794) Daniel W. E. Green
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