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IAUC 5188: 1991F; 1991G; 1991H

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                                                  Circular No. 5188
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

     J. Mueller reports her discovery of a supernova located 13".4
east and 12".1 south of the center of NGC 3458 (R.A. = 10h53m.0,
Decl. = +57 24', equinox 1950.0).  The supernova was at blue magnitude
about 18 on the Feb. 10 UT discovery plate taken with the 1.2-m
Oschin Telescope in the course of the second Palomar Sky Survey by
C. Brewer and J. D. Mendenhall.  A spectrogram obtained Feb. 14 with
the Hale 5-m telescope (+ 4-shooter + spectrograph) by M. Schmidt,
J. Gunn, D. Schneider, and R. Lucinio shows that SN 1991F is likely
a type-I supernova and that it is fading rapidly.

     Mueller also reports her discovery, again on a plate taken by
Brewer and Mendenhall, of a supernova located about 37" west and
13".4 south of the center of NGC 4088 (R.A. = 12h03m.0, Decl. =
+50 48', equinox 1950.0).  On Feb. 10 UT, SN 1991G appeared at red
magnitude about 17.  A Feb. 14 spectrogram by Schmidt et al. shows
strong H-alpha, indicating this to be a type-II supernova.

     R. H. McNaught, University of Adelaide, reports his discovery,
on a U.K. Schmidt Telescope R plate taken Feb. 12.74 UT by K. S.
Russell, of a supernova of mag 17.5 in Reiz 3080.  The supernova is
located at R.A. = 12h56m17s.24, Decl. = -10 27'51".5 (equinox
1950.0), or 2" west and 11" south of the galaxy's center (and is
identical in brightness to a nearby star located at R.A. =
12h56m16s.14, Decl. = -10 28'12".1).  A Tech Pan exposure taken Feb.
13.77 with the Uppsala Southern Schmidt shows the SN at mag about
18.  There appears to be a faint knot (mag about 21) in the SN
position on a UKST R plate exposed 1986 Mar. 15.  M. Turatto,
Osservatorio Astronomico di Padova; and M. Della Valle, European Southern
Observatory, communicate:  "Preliminary inspection of a low-resolution
spectrogram (range 370-700 nm), obtained on Feb. 14.3 UT with
the ESO/Max-Planck-Institut 2.2-m telescope (+ Boller and Chivens
spectrograph) at La Silla, shows that SN 1991H is a type-II supernova
two weeks past maximum.  The expansion velocity derived from
the minimum of the H-alpha P-Cyg absorption is about 6000 km/s.  A
strong Na I absorption is visible at 588.0 nm.  Other absorption
features are measured at 487.0, 503.0, 518.5, and 569.0 nm."

1991 February 14               (5188)             Daniel W. E. Green

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