Circular No. 4724 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 COMET SHOEMAKER (1989f) E. M. Shoemaker reports another cometary discovery by Carolyn S. Shoemaker on exposures with the 0.46-m Schmidt telescope at Palomar: 1989 UT R.A. (1950) Decl. m1 Jan. 11.39461 9 07 10.99 +48 39 41.3 16 14.48020 9 06 28.25 +49 19 34.4 The object is diffuse and condensed with a coma that is asymmetric toward the southwest. SUPERNOVA 1988aa G. Comte, Observatoire de Marseille, telexes: "During a photometric survey of ultraviolet-excess galaxies by means of RCA-CCD 3-color imagery with the Pic-du-Midi 2-m Bernard Lyot telescope, I discovered a supernova on frames taken on 1988 Dec. 14-15 at R.A. = 0h10m06s.2, Decl. = -0d18'35" (equinox 1950.0). The stellar image of the supernova is extremely red: B = 19.65, R(Cousins) = 17.40, I(Cousins) = 16.40. It is projected on to a faint background extended object barely visible on the POSS blue prints, near (2" west and 18" north of) the Kiso Ultraviolet- excess Galaxy 0010-003. It remains marginally possible that the SN belongs to KUG 0010-003, in which case its projected distance to the center of the KUG is 11.5 kpc for H = 100 km s-1 Mpc-1, the redshift of the KUG being z = 0.0392 from our unpublished spectroscopic observations. However, it seems more plausible that the SN is located in the faint background object, with a possibly fairly large redshift." SUPERNOVA 1989A IN NGC 3687 J. Graham, California Insitute of Technology; and S. Perlmutter, University of California at Berkeley, report that an uncalibrated spectrum (range 300-700 nm) taken on Jan. 24 by P. Charles at the Isaac Newton Telescope shows that this object appears to be a type Ia supernova within a week of maximum light. The spectrum shows P-Cyg profiles due to Si II, S II, Mg II and Ca II, with the absorption trough of Si II 635.5 nm at about 609 nm. 1989 January 27 (4724) Brian G. Marsden
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