Central Bureau for Astronomical Telegrams
IAUC 5188: 1991F; 1991G; 1991H
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 5189
Circular No. 5188
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 1991F IN NGC 3458
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.
SUPERNOVA 1991G IN NGC 4088
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.
SUPERNOVA 1991H IN REIZ 3080
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
Read IAUC 5189
Our Web policy. Index to the CBAT/MPC/ICQ pages.
