Central Bureau for Astronomical Telegrams
IAUC 5475: 1992N; 1992I; GALACTIC CENTER; N Cyg 1992
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Read IAUC 5476
Circular No. 5475
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 1992N IN IC 4831
J. Maza, University of Chile; and M. Hamuy, Cerro Tololo
Interamerican Observatory, report the discovery by R. Antezana (University
of Chile) of an apparent supernova located about 94" east and 43"
south of the nucleus of the Sa-type galaxy IC 4831 (R.A. =
19h10m09s.2, Decl. = -62 21'31", equinox 1950.0). SN 1992N was
found on a 20-min unfiltered IIa-O plate taken by Antezana with the
CTIO Curtis Schmidt telescope on Mar. 10.368 UT. The supernova
appears also on a previous unfiltered IIa-O plate taken with the same
telescope by L. Wells and R. C. Smith on Mar. 3.389. On both plates
the supernova appears at magnitude 19.
SUPERNOVA 1992I IN NGC 2565
A. V. Filippenko, T. Matheson, L. C. Ho, and W. D. Vacca,
University of California at Berkeley, report that CCD spectra (range
340-1000 nm) obtained on Mar. 13 UT with the Shane 3-m reflector at
Lick Observatory show that SN 1992I (cf. IAUC 5464) is of type II.
The emission component of the H-alpha profile is much stronger than
the absorption component.
GALACTIC CENTER
B. A. Harmon, W. S. Paciesas, B. Rubin, M. H. Finger, G. J.
Fishman, R. B. Wilson, and C. A. Meegan, Marshall Space Flight Center,
NASA, report for the Compton Observatory BATSE Experiment Team:
"Increased hard x-ray emission from the galactic center region
consistent with the position of 1E 1740.7-2942 has been observed by
Earth occultation beginning Feb. 28 and peaking around Mar. 3. The
average fluxes between Mar. 2 and 5 in the 20- to 50-keV and 50- to
320-keV energy bands are about 280 +/- 40 and 150 +/- 30 mCrab,
respectively. The spectrum above 50 keV is well fit by a single power
law with index -2.3 +/- 0.2. Contribution to the flux from nearby
softer x-ray sources cannot be ruled out."
NOVA CYGNI 1992
H. Mikuz, Ljubljana, forwards the following additional
photoelectric photometry by A. Dolzan, Litija, Slovenia (cf. IAUC 5469):
Mar. 11.157 UT, V = 6.36 +/- 0.01, B-V = +0.20 +/- 0.03, U-B = -0.64
+/- 0.05 (comparison star HR 7828).
1992 March 14 (5475) Daniel W. E. Green
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