IAUC 5247: 1991U; 1991l

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                                                  Circular No. 5247Central Bureau for Astronomical TelegramsINTERNATIONAL ASTRONOMICAL UNIONPostal Address: Central Bureau for Astronomical TelegramsSmithsonian 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 62794505MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPANSUPERNOVA 1991U IN IC 4232     J. Maza, University of Chile; and M. M. Phillips, Cerro TololoInteramerican Observatory, telex:  "Roberto Antezana (University ofChile) has discovered a supernova 3" west and 6" north of the nucleusof 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-minIIa-O plate taken by M. Hamuy and L. Wells with the CTIO CurtisSchmidt telescope on Apr. 18.20 UT, and was also recorded on a T-Maxfilm 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 obtainedon Apr. 20.2 by Phillips with the CTIO 4.0-m telescope shows thatthis is a type-Ia supernova about 11 days past blue maximum.  Aspectrum 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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