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IAUC 3578: 1981b; Prob. SN IN NGC 1532; Poss. N IN Cam; 1980g

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                                                  Circular No. 3578
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

COMET BUS (1981b)
     Schelte J. Bus, California Institute of Technology, currently
observing with the U.K. Schmidt Telescope Unit at Siding Spring, reports
his discovery of a comet on a plate taken by K. S. Russell
with the 1.2-m telescope, as follows:

     1981 UT          R. A. (1950) Decl.     m1
     Mar.  2.583     11 53.4     + 0 09     17.5

A confirmation plate was obtained on Mar. 3; daily motion is ~ 9'
northwestward (not northeastward, as was indicated on the telegram),
and there is a probable tail in a direction slightly north of west.

     T. Cragg, Anglo-Australian Observatory, reports that R. Evans
has visually discovered a supernova 70" east and 15" north of the
center of NGC 1532.  Cragg estimated magnitude 14.5 on the night of
discovery, Feb. 24, and 13.0 on Feb. 28.  C. Torres, Department of
Astronomy, University of Chile, communicates that L. E. Gonzalez
and M. Wischnjewsky have confirmed the discovery at Cerro Calan.
Approximate coordinates (equinox 1950.0): R.A. = 4h10m.2, Decl. = -33o00'.

     T. Reiland, Allegheny Observatory, writes that he has found a
possible nova on a 20-min 103a0 exposure by J. Kirby beginning at
5h UT on 1980 Nov. 6.  G. Fennell find mpg = 8.47 and provides the
following measured position (equinox 1950.0): R.A. = 4h27m00s.39, Decl. =
+58o38'40".9.  Plates taken on the nights of 1980 Sept. 30-Oct. 1
and 1981 Jan. 8-9 do not show the object, but examination of a red
print from the Palomar Observatory Sky Survey reveals an image of
magnitude 19-20 in the position of the suspected nova.

     Selected visual magnitude estimates and coma diameters: Jan.
25.13  UT, 10.5, 4'.0 (C. E. Spratt, Victoria, BC, 0.25-m reflector);
31.02, 10.3, 3'.5 (J. E. Bortle, Stormville, NY, 0.32-m reflector);
Feb. 3.17, 11.0, 2'.5 (Spratt); 6.17, 10.9, 2'.3 (C. S. Morris, Harvard,
MA, 0.25-m reflector); 10.07, 10.6, 2'.4 (Bortle).

1981 March 4                   (3578)              Daniel W. E. Green

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