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IAUC 4591: 1979G; 1988M; 1986k

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                                                  Circular No. 4591
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 1979G IN MCG +01-08-023
     A. R. Klemola, Lick Observatory, reports that S. Francic has
discovered a stellar object, presumably a supernova, on
simultaneous blue and yellow exposures by B. Jones with the 0.5-m
Carnegie double astrograph on 1979 Dec. 17.23 UT.  The object, of
B about 16.5, was located at R.A. = 2h55m48s.63,
Decl. = -5D01'08".0 (equinox 1950.0), or 9".4 east and 4".4 south
of the nucleus of the galaxy MCG +01-08-023 (mag 15.5).

     A. V. Filippenko, University of California at Berkeley; and
W. L. W. Sargent, California Institute of Technology, report the
discovery of a probable type II supernova long past maximum brightness
in NGC 4496B (R.A. = 12h29.1m, Decl. = +04D12'.1,  equinox 1950.0).
The object was discovered serendipitously in a long-slit spectrum
(p.a. 180D, range 620-686 nm,  resolution 0.2-0.3 nm)
obtained on Apr. 7 with a CCD spectrograph attached to the 5-m
reflector at Palomar Observatory.  Weak, broad (FWZI approx. 6000
km/s) H-alpha emission at the approximate redshift of NGC 4496B (cz =
4510 km/s) was detected 12".5 south of the nucleus, between NGC 4496B
and an H II region in the foreground galaxy NGC 4496A (cz = 1700
km/s).  No evidence for the SN was visible in a spectrum covering the
range 422-510 nm (resolution 0.5 nm).  If the distance to NGC 4496B is
60 Mpc (Ho = 75 km s**-1 Mpc**-1), the measured luminosity of H-alpha
is 1.7 x 10**39 ergs/s.  Comparison with the luminosity of SN 1980K
(Uomoto and Kirshner 1986, Ap.J. 308, 685) suggests that SN 1988M  was
discovered 300-400 days past maximum, consistent with its
spectroscopic appearance.  Observers are urged to search for SN
1988M, which may have been as bright as mag 16-17, on images of NGC
4496B obtained during the past two years.

     Total visual magnitude estimates: Feb. 9.24 UT, 13.2 (A. Hale,
Las Cruces, NM, 0.41-m reflector); 13.22, 13.0 (C. S. Morris, Whitaker
Peak, CA, 0.26-m reflector); 16.21, 13.0 (Morris); 17.24, 13.2 (Hale);
18.30, 12.6 (R. Keen, Mt. Thorodin, CO, 0.32-m reflector).

1988 May 10                    (4591)              Brian G. Marsden

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