Central Bureau for Astronomical Telegrams
IAUC 4965: 1990E; 1989c1; T Leo
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Circular No. 4965
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1990E IN NGC 1035
C. Pennypacker and S. Perlmutter, University of California at
Berkeley, report the discovery by the Berkeley Automated Supernova
Search of a supernova in NGC 1035 at magnitude 16.7 +/- 0.5 on three
images taken Feb. 15.12-15.17 UT. The object was not present to a
limiting magnitude of 19 (95-percent confidence limit) on an image
obtained Feb. 10. The supernova is about 5" west and 10" south of
the galaxy nucleus, which is at R.A. = 2h37m01s, Decl. = -8 20.8
(equinox 1950.0). Perlmutter notes that the galaxy has a redshift
of 1237 km/s, and he forwards the following information obtained at
his request, which suggest that this is a type-II supernova that is
still rising in brightness. M. Shara obtained a low-resolution,
rather featureless spectrum (range 370-700 nm) with the Cerro Tololo
Interamerican Observatory 4-m reflector on Feb. 16.02, showing a
minor emission around H-beta and nothing around H-alpha. W. L. W.
Sargent observed SN 1990E at mv = 15.2 on Feb. 16.13 with the Palomar
5-m reflector; a spectrum (range 590-890 nm) shows broad H-alpha
emission with a bit of narrow absorption (FWHM = 14 000 km/s), and
a broad feature at 590 nm is likely the Na D signature of the host
galaxy. Observations at the Anglo-Australian Telescope on Feb. 16.48
by R. Stathakis and R. Cannon show the same features as seen in the
Palomar spectrum, and also a bit of an absorption at He I 587.6 nm.
Inspection of these uncalibrated spectra show that the P-Cyg profile
at H-alpha has definitely increased in the approximately 7 hr between
the Palomar and AAT observations, and observers are encouraged to
monitor the SN's development on short timescales.
COMET AUSTIN (1989c1)
Further total visual magnitude estimates: Jan. 28.11 UT, 8.5
(C. S. Morris, Lockwood Valley, CA, 0.26-m reflector; correction to
IAUC 4957); Feb. 7.75, 7.2: (A. Boattini, Monte Morello, Italy,
20x80 binoculars); 13.44, 7.3 (T. Lovejoy, Melbourne, Vic., 15x80
binoculars); 14.44, 7.6 (G. Garradd, Tamworth, N.S.W., 10x50 binoculars).
T LEONIS
Visual magnitude estimates of an apparent outburst: Jan. 23.2
UT, 15.0 (M. Idem, Buffalo, NY); 27.1, [12.3 (E. Meyer, Barberton,
OH); Feb. 15.97, 10.4 (P. Schmeer, Bischmisheim, W. Germany).
1990 February 16 (4965) Daniel W. E. Green
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