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IAUC 5469: 1982Z, 1992L; 1992b; N Cyg 1992

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                                                  Circular No. 5469
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     R. H. McNaught, Anglo-Australian Observatory, reports his
discovery in a single anonymous spiral galaxy of two supernovae, one
currently observable and the other on the ESO R survey field 257.
SN 1992L is of mag about 20 on R plates taken on 1992 Mar. 3.5 UT by
M. Hartley and Mar. 6.4 by Q. A. Parker with the U.K. Schmidt Telescope.
The position of the supernova is R.A. = 7h34m08s.69, Decl. =
-47 10'07".9 (equinox 1950.0, uncertainty 0".3 in each coordinate);
the offset from the galaxy's center is 6".3 west, 4".8 south.  SN
1982Z (mag about 19) is present on the ESO R survey taken 1982 Feb.
12 at R.A. = 7h34m10s.44, Decl. = -47 10'04".2, the offset from the
galaxy's center being 11".5 east, 1".2 south.  Examination of other
survey films indicates that these images are not of a single
foreground star with high proper motion.  Nearby field stars have the
following magnitudes and end figures:  18, 08s.15, 19".2; 18.5,
11s.09, 08".9.

     A. C. Gilmore and P. M. Kilmartin, Mount John University
Observatory, report that after failing to record the comet on short
exposures with the 0.6-m reflector on Mar. 3.7 UT, they attempted 15-
min and other longer exposures on two subsequent nights.  On Mar.
4.7 a patch of irregular brightness appeared at the comet's predicted
position; the patch was elongated, roughly 4' x 2', with the long
axis in p.a. 70 +/- 10 deg.  On Mar. 7.7 there was at the predicted
position only a very faint patch, involved with star trails, and
about 3' across.
     Further total visual magnitude estimates (cf. IAUC 5442, 5445):
Feb. 13.65 UT, 10.1 (A. Jones, Nelson, N.Z., 0.32-m reflector);
14.54, 9.5: (A. Hale, Las Cruces, NM, 0.41-m reflector); 15.70, 10.3
(P. Camilleri, Cobram, Victoria, 0.20-m reflector).

     H. Mikuz, Ljubljana, forwards the following additional
photoelectric photometry by A. Dolzan, Litija, Slovenia (cf. IAUC 5467):
Mar. 9.164 UT, V = 6.13 +/- 0.01, B-V = +0.27 +/- 0.05, U-B = -0.67
+/- 0.06; Mar. 10.157, 6.27 +/- 0.01, +0.25 +/- 0.03, -0.67 +/- 0.05
(comparison star HR 7828).

1992 March 10                  (5469)             Daniel W. E. Green

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