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IAUC 4287: 1986N; 1986J; BZ UMa; 1986n

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                                                  Circular No. 4287
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

     C. Pennypacker, S. Burns, F. Crawford, P. Friedman, J. Graham,
J. Kare, R. Muller, C. Okada, S. Perlmutter, C. Smith, R. Treffers,
and R. Williams, Lawrence Berkeley Laboratory and University of
California; P. Aanestad, Arizona State University; and J. Stauffer,
NASA Ames Research Center, report the discovery at Leuschner
Observatory on Dec. 11 of a magnitude 15 supernova located 15" west and
7" south of the center of NGC 1667 (R.A. = 4h46m.2, Decl. = -6 24', equinox
1950.0).  The object was fainter than mag 17.5 on Nov. 12.  A stellar
object at this location was confirmed on Dec. 23 with the Kitt
Peak No. 1 0.9-m telescope, and spectra obtained the same night at
the Multiple-Mirror Telescope (range 370-470 nm) show broad
emission lines characteristic of supernovae.

     S. Sukumar, Max-Planck-Institut fur Radioastronomie, Bonn, and
Radio Astronomy Center, Ootacamund, reports prediscovery observations
(cf. IAUC 4248, 4258, 4260) of this object obtained with the
Very Large Array as follows:  1984 Aug. 29, flux density 37.2 +/- 0.5
mJy at 4.885 GHz and 7.5 +/- 2.2 mJy at 1.465 GHz.

     J. Kaluzny, Space Telescope Science Institute, communicates:
"CCD photometry obtained with the Kitt Peak 0.91-m telescope on
Dec. 13 and 14 indicate that BZ UMa (R.A. = 8h49m52.9, Decl. = +58 00'02",
equinox 1950.0), a dwarf nova with exceptionally long mean-outburst
intervals, is currently in a low state at B = 17.8.  In the past,
its minimum observed brightness was B about 16 (cf. Wenzel IBVS 2257).
No variations with an amplitude > 0.1 mag were detected during the
4-hr observing session."

     Total visual magnitude estimates (L = reflector, B = binoculars):
Nov. 27.82 UT, 9.6 (J.-C. Merlin, Le Creusot, France, 0.15-m
L); Dec. 1.14, 9.7 (C. Spratt, Victoria, BC, 0.20-m L); 3.13, 9.9
(R. Keen, Mt. Thorodin, CO, 0.32-m L); 6.06, 9.7 (J. Bortle, Stormville,
NY, 20x80 B); 7.98, 8.7 (M. V. Zanotta, near Bergamo, Italy,
20x80 B); 10.54, 9.2 (Y. Sugiyama, Hiratsuka, Japan, 0.16-m L);
22.14, 8.6 (C. S. Morris, Whitaker Peak, CA, 0.26-m L).

1986 December 23               (4287)            Daniel W. E. Green

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