Central Bureau for Astronomical Telegrams
IAUC 5247: 1991U; 1991l
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Circular No. 5247
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 1991U IN IC 4232
J. Maza, University of Chile; and M. M. Phillips, Cerro Tololo
Interamerican Observatory, telex: "Roberto Antezana (University of
Chile) has discovered a supernova 3" west and 6" north of the nucleus
of the spiral galaxy IC 4232 (R.A. = 13h20m37s, Decl. = -25 51'.0,
equinox 1950.0). The supernova (mpg about 16) was found on a 20-min
IIa-O plate taken by M. Hamuy and L. Wells with the CTIO Curtis
Schmidt telescope on Apr. 18.20 UT, and was also recorded on a T-Max
film taken by Hamuy and Wells with the Curtis Schmidt on Apr. 19.23.
A CCD spectrum covering the wavelength range 360.0-680.0 nm obtained
on Apr. 20.2 by Phillips with the CTIO 4.0-m telescope shows that
this is a type-Ia supernova about 11 days past blue maximum. A
spectrum of the nucleus of IC 4232 yields a redshift of 0.032."
COMET HELIN-LAWRENCE (1991l)
Ephemeris from orbital elements on MPC 18082:
T = 1992 Jan. 20.2520 ET Peri. = 271.1233
Node = 11.1285 1950.0
q = 1.519618 AU Incl. = 95.4743
1991 ET R.A. (1950) Decl. Delta r m1
Apr. 24 12 35.41 + 9 06.9
May 4 12 19.76 + 8 39.1 2.779 3.589 13.3
14 12 05.56 + 7 56.1
24 11 53.43 + 6 59.1 2.855 3.393 13.1
June 3 11 43.65 + 5 50.2
13 11 36.28 + 4 31.3 2.998 3.196 12.9
23 11 31.21 + 3 03.8
July 3 11 28.22 + 1 28.8 3.151 2.999 12.8
13 11 27.06 - 0 13.3
23 11 27.50 - 2 02.6 3.269 2.802 12.5
Aug. 2 11 29.29 - 3 59.5
12 11 32.25 - 6 04.6 3.320 2.606 12.3
Total visual magnitude estimates (cf. IAUC 5219): Apr. 4.17 UT,
12.9 (J. E. Bortle, Stormville, NY, 0.32-m reflector); 5.30, 13.6
(A. Hale, Las Cruces, NM, 0.41-m reflector); 14.29, 13.4 (Hale);
16.85, 13.9 (A. Pearce, Dowerin, W.A., 0.41-m reflector).
1991 April 22 (5247) Daniel W. E. Green
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