Central Bureau for Astronomical Telegrams
IAUC 5300: 1991aj; 1991ai; 1991T; 1991K
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Circular No. 5300
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)
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MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1991aj IN MCG +07-34-84
C. Pollas, Observatoire de la Cote d'Azur, reports his discovery
of a mag 18.0 supernova located at R.A. = 16h28m06s.24, Decl.
= +41D53'10".6 (equinox 1950.0) in MCG +07-34-84. The discovery was
made on Kodak technical pan films obtained with the 0.9-m Schmidt on
July 3.98 and 6.93 UT. The position of the nucleus of the mag 16
spiral galaxy has end figures 06s.00, 08".7, and there is a mag 17.5
star at 06s.12, 18".1.
B. Leibundgut, Harvard-Smithsonian Center for Astrophysics,
reports that an uncalibrated spectrum obtained by J. Huchra and C.
Heller on July 8.2 UT with the Multiple-Mirror Telescope confirms the
object as a type Ia supernova about one week past B maximum. The
galaxy has a redshift of about 9600 km/s.
SUPERNOVA 1991ai IN IC 4434
B. Leibundgut also reports that Huchra and Heller find this object
to show all the characteristic lines of a type Ia supernova about ten
days past B maximum. Strong absorptions of Si II, Ca II and Fe II are
present. All lines are shifted considerably to the red, indicating a
high redshift for the parent galaxy.
SUPERNOVA 1991T IN NGC 4527
T. E. Harrison, Mount Stromlo Observatory, reports the following
infrared photometry, obtained by G. Stringfellow and himself using IRPS
and CIGs on the 2.3-m telescope at Siding Spring on June 22.36 UT:
J = 14.97 +/- 0.30, H = 13.72 +/- 0.14, K = 13.72 +/- 0.25.
Visual magnitude estimates: June 4.90 UT, 13.5 (S. Korth,
Dusseldorf, Germany; correction to IAUC 5287); 13.18, 13.6 (R. J.
Modic, Richmond Heights, OH); 17.27, 13.7 (W. Wren, near Fort Davis,
TX); July 6.21, 14.1 (Wren).
SUPERNOVA 1991K IN NGC 2851
M. M. Phillips, Cerro Tololo Interamerican Observatory, reports:
"I have reexamined the spectra of SN 1991K that I obtained with the CTIO
4.0-m telescope on Mar. 9 and 12 UT (cf. IAUC 5205). Based on a
comparison of these data with spectra of the type Ib SN 1983N and the
type Ia SN 1981B, I now conclude that SN 1991K was a type Ia event
(rather than type II or Ib) approximately three months past maximum."
1991 July 8 (5300) Brian G. Marsden
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