Central Bureau for Astronomical Telegrams

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IAUC 4992: 1990H; (279); 1990b

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                                                  Circular No. 4992
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

     S. Perlmutter, C. Pennypacker, H. Marvin, T. Sasseen, C. Smith,
and R. Muller, University of California at Berkeley, report:
"Images obtained on Apr. 9.4 UT in the course of the Berkeley
Automated Supernova Search reveal a probable supernova in NGC 3294
(R.A. = 10h33m24s, Decl. = +37 35'.1, equinox 1950.0).  The supernova
is located 12" west and 1" south of the galaxy's nucleus, and
was at mag 16 on Apr. 9; it was subsequently found to be present
(fainter than our threshold for automatic detection:  mag about
16.5 to 17, depending on the seeing) in prior images obtained on
Jan. 24 and 29, Feb. 14, 15, 22, 23, and 26, Mar. 5, 19, 26, 27,
28, and 30, and Apr. 2.  A good image obtained on 1989 Nov. 10
shows no object present to a limiting magnitude of 18 (95-percent
confidence level).  Images were also taken on 1989 Dec. 6 and 23
and on 1990 Jan. 19 that show no evidence for the supernova, but
they were poor in quality.  Additional analysis on these images is
underway.  The long, slow rise in the luminosity is reminiscent of
SN 1987A."

(279) THULE
     C.-I. Lagerkvist, Uppsala Observatory; I. P. Williams, Queen
Mary and Wakefield College; A. Fitzsimmons, Queens' University,
Belfast; and M. Dahlgren, Uppsala Observatory, communicate:  "We
observed (279) Thule with the Faint Object Spectrograph on the
4.2-m William Herschel Telescope at the Roque de los Muchachos
Observatory, La Palma, on the night of Mar. 18 and found a broad
absorption feature resembling a molecular band in its reflectance
spectrum with the maximum absorption occuring at a wavelength of
approximately 517 nm."

     Total visual magnitude estimates (cf. IAUC 4986):  Mar. 28.17
UT, 8.4 (A. Hale, Las Cruces, NM, 10x50 binoculars); 30.85, 8.3 (T.
Larsen, Lysaker, Norway, 0.20-m reflector); Apr. 1.17, 8.9 (C.
Spratt, Victoria, BC, 0.14-m reflector); 4.18, 8.9 (Hale, 0.41-m
reflector); 4.91, 9.5 (B. H. Granslo, Blindern, Oslo, Norway, 0.20-m
reflector); 7.18, 9.1 (Spratt, 0.20-m reflector).

1990 April 11                  (4992)             Daniel W. E. Green

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