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                                                  Circular No. 3462
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 617-864-5758

     P. Wild, Astronomical Institute, Berne University, reports the
discovery of a supernova 32" west and 113" north of the nucleus of
NGC 3733 (R.A. = 11h32m.2, Decl. = +55o09', equinox 1950.0).  On Mar. 17
mpv was 15.0.  The discovery was confirmed on Mar. 20.
     S. Faber, Lick Observatory, reported on Mar. 20 the discovery
of a possible supernova near the nucleus of NGC 5854 (R.A = 15h05m.3,
Decl. = +2o45', equinox 1950.0).  The object is of mag ~ 15.0 and
appears to be a supernova of type I, some 20 days after maximum.

     H. Barwig, R. Schoembs and B. Stoltz, Munich University
Observatory, report a probable super outburst of the U-Gem star SU
UMa (R.A. = 8h03m.7, Decl. = +62o54', equinox 1900.0).  Observations at the
M.P.I.A. Observatory in Spain on Mar. 16.0 UT and in Munich on Mar.
19.0 UT gave mv = 11.2 +/- 0.2 and 11.2 +/- 0.3, respectively.  During
an 8-hr run on Mar. 15-16 no clear periodic variation was seen.

     K. Horne, J. Cohen, J. B. Oke and S. W. Mochnacki, Hale
Observatories, California Institute of Technology, write: "We have
discovered that Stepanyan's star (IBVS No. 1630) is an eclipsing
binary.  Three eclipses observed in 34 days require a period of
3h48m11s +/- 1s and epoch HJD = 2444293.0243.  The symmetric eclipses
are 2.5 mag deep in blue light with 20 min duration at half depth.
The H-alpha emission line has a broad (1500 km/s full width), variable,
multicomponent profile whose equivalent width relative to the
continuum increases during eclipse.  The 4-hr period, 0.2-mag flickering
on minute timescales, and an f_nu ~ constant spectrum studded
with broad H I, He I and He II emission features suggest that this
object is a new eclipsing cataclysmic variable."

     Visual observation by J. DeVoung, Palmyra, VA (0.15-m f/8
reflector, 67 x): Mar. 4.04 UT, m1 = 11.0, D = 3'.5.

1980 March 21                  (3462)              Brian G. Marsden

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