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IAUC 4533: 1988A; Poss. SN IN NGC 3191; N Vul 1987; 1986 III

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IAUC number

                                                  Circular No. 4533
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

     H. Kosai, Tokyo Astronomical Observatory, reported the visual
discovery on Jan. 18 by Kaoru Ikeya, Maisaka-machi, Shizuoka, of a
possible supernova in M58 (NGC 4579; R.A. = 12h35.1, Decl. = +12 05',
equinox 1950.0), located 40" due south of the galaxy's center.  An
independent discovery was made by Robert O. Evans, Hazelbrook,
N.S.W.  The following visual magnitude estimates are available:
Jan. 15.7 UT, [15.5 (Evans); 18.799, 13.5 (Ikeya); 20.757, 13.5
(Ikeya); 22.45, 13.9 (J. Bryan, Georgetown, TX); 22.73, 14.5
(Evans).  J. C. Wheeler, University of Texas at Austin, reports an
observation obtained Jan. 22 at McDonald Observatory by A. Cochran
and E. Barker under unfavorable weather conditions, revealing a
supernova-like object with a fairly featureless spectrum and a
broad emission feature near H-beta, with a deep absorption on the
blueward side of the emission.  E. M. Schlegel, Center for Astrophysics,
reports that a low signal-to-noise, low-dispersion (400-700
nm) spectrum, obtained by J. Peters on Jan. 22.5 with the 1.5-m
telescope (+ Z-machine) at Whipple Observatory (poor seeing), indicates
this to be probably a type-II SN, not long after maximum; the
FWZI of the H-alpha emission is at least 10 000 km/s and may show a
weak P-Cyg profile.

     T. Schildknecht, University of Berne, reports the discovery by
P. Wild of a possible supernova in  NGC 3191 (R.A. = 10h16.0, Decl. =
+46 23', equinox 1950.0), located 10" north of the galaxy's center.
On Jan. 18.94 and 21.85 UT, it was at mag about 15.5.

     This object has apparently faded very rapidly, as indicated by
the following visual magnitude estimates (cf. IAUC 4526):  Jan.
12.22 UT, 9.4 (P. Schmeer, Bischmisheim, West Germany); 12.73, 9.8
(Schmeer); 21.27, [14.0 (S. Lubbock, Bridgend, Wales); 21.53, [12.0
(A. Hale, Las Cruces, NM).

     Total visual magnitude estimates by D. Levy, Catalina Mtns.,
AZ (1.6-m refl.):  1987 Dec. 21.45 UT, 15.3; 1988 Jan. 15.44, 15.8.

1988 January 22                (4533)            Daniel W. E. Green

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