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IAUC 4545: 1988D; 1987f1; OS And; 1987p

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                                                  Circular No. 4545
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444

SUPERNOVA 1988D IN MCG +0-20-006
     Alain Maury and Jean Mueller, Palomar Observatory, report the
discovery on Feb. 9 of a supernova in MCG +0-20-006 (R.A. = 7h49.2, Decl.
= +2 57', equinox 1950.0) on a plate exposed with the 1.2-m Schmidt
telescope in the course of the Sky Survey II.  The object (mag about
15-16) is located 5" east and 15".5 south of the galaxy's center.  A
measurement by S. G. Djorgovski with the Palomar 1.5-m telescope
gave the offset from the nucleus as 5".5 east, 14".8 south.  A. V.
Filippenko, University of California at Berkeley, and W. L. W.
Sargent, California Institute of Technology, report that spectra
(range 420-685 nm, resolution 0.2-0.6 nm) obtained on Feb. 10 with
a CCD spectrograph on the Palomar 5-m reflector show that this is a
type-Ia supernova, probably about one month past maximum.

     Total visual magnitude estimates:  Jan. 7.09 UT, 9.8 (A. Hale,
Las Cruces, NM, 0.41-m reflector); 9.77, 10.2 (M. V. Zanotta,
Milan, Italy, 0.30-m reflector); 11.78, 10.3 (W. Hasubick, Buchloe,
West Germany, 0.20-m reflector); 13.15, 9.6 (C. S. Morris, Whitaker
Peak, CA, 0.26-m reflector); 14.81, 10.5 (J. Shanklin, Cambridge,
England, 0.33-m reflector); 20.43, 10.5 (J. Kobayashi, Kumamoto,
Japan, 0.31-m reflector; 3' tail in p.a. 70 deg); 21.14, 9.8 (Hale);
Feb. 7.10, 8.8 (R. Keen, Mt. Thorodin, CO, 0.32-m reflector); 8.16,
9.8 (Morris); 10.14, 9.8 (Morris).

     Visual magnitude estimates (cf. IAUC 4513): 1987 Dec. 7.80 UT,
14.0 (S. Korth, Monheim, West Germany); 8.90, 13.8 (Korth); 11.76,
14.1 (M. Verdenet, Bourbon-Lancy, France); 23.83, 14.1 (Korth);
1988 Jan. 6.86, 14.2 (Korth); 7.74, 14.8 (Verdenet); 8.76, 14.0 (A.
Boattini, Piazzano, Italy); 11.86, 14.4 (Korth).

     Total visual magnitude estimates:  Jan. 24.42 UT, 8.9 (Y.
Sugiyama, Hiratsuka, Japan, 0.16-m reflector); 31.20, 8.3 (Hale;
moonlight); Feb. 4.80, 9.8 (Shanklin, 0.2-m refractor); 6.86, 9.9
(Shanklin); 7.16, 9.2 (Keen); 8.19, 9.1 (Morris, 20x80 binoculars);
8.21, 9.2 (Hale); 10.17, 9.1 (Morris).

1988 February 10               (4545)            Daniel W. E. Green

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