Central Bureau for Astronomical Telegrams
IAUC 5491: 1992P; 1992O; 1992N; 1992d
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Circular No. 5491
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 1992P IN IC 3690
J. Maza, University of Chile; and M. Hamuy, Cerro Tololo
Interamerican Observatory, report the discovery by R. Antezana of a
supernova located about 6" west and 11" north of the nucleus of the
spiral galaxy IC 3690 (R.A. = 12h40m17s.8, Decl. = +10d37'51", equinox
1950.0). The supernova (mpg = 16.5-17.0) was found on a 20-min
unfiltered IIa-O plate taken by L. Wells with the Curtis Schmidt
telescope on Apr. 3.203 UT. The supernova was not present on a IIa-O
plate taken with the same telescope by Antezana on Mar. 9 (mpg [ 20).
Confirmation was made by C. Bailyn and Y.-C. Kim from B and V CCD
images obtained on Apr. 6.2 with the CTIO 0.9-m telescope, the former
yielding B = 16.2. A spectrum covering the wavelength range 500-700
nm was obtained by B. Yanny on Apr. 6.3 with the 4-m telescope,
showing the characteristic Si II 635.5-nm feature of type Ia
supernovae. The minimum of the Si II absorption yields an expansion
velocity of about 10 500 km/s with respect to the galaxy's rest frame.
The spectrum also shows two S II features around 550 nm, implying that
the supernova is near maximum light.
SUPERNOVA 1992O IN ANONYMOUS GALAXY
Hamuy and Maza report that the spectrum of SN 1992O, obtained by
them with the CTIO 4-m reflector on Apr. 4.375 UT, shows a
considerable resemblance to that of the type Ia SN 1990N 38 days after
blue maximum. A spectrum of the nucleus of the host galaxy yields a
redshift of z = 0.037.
SUPERNOVA 1992N IN IC 4831
They add that a CTIO 4-m spectrum on Apr. 4.395 UT yields P-Cyg
profiles for the Balmer lines, indicating SN 1992N to be a
type II supernova. The expansion velocity, measured between the
minimum of the H-alpha absorption and the rest wavelength in the
galaxy frame, is about 5000 km/s.
COMET TANAKA-MACHHOLZ (1992d)
Total visual magnitude estimate by J. Kanipe, Cedar Park, TX
(0.33-m reflector): Apr. 4.47 UT, 8.9.
Corrigenda. On IAUC 5488, lines 2-3, for photograph read film.
On IAUC 5489, line 11, for 0.25-m f/3.4 read 0.16-m f/4.8.
1992 April 6 (5491) Brian G. Marsden
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