Circular No. 5543 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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU) SUPERNOVAE 1992R AND 1992ac IN MCG +10-24-007 G. Gomez, Instituto de Astrofisica de Canarias; and R. Lopez, Universidad de Barcelona, report: "Optical spectra were obtained on May 30.2 UT by G. Gomez, R. Lopez, J. Rey (La Palma Observatory), and R. Catchpole (Royal Greenwich Observatory) with the 2.5-m Isaac Newton telescope and the Faint Object Spectrograph (resolution 1 nm, range 320-1000 nm) at Observatorio del Roque de los Muchachos, La Palma. A spectrogram of the nucleus of the galaxy MCG +10-24-007 (R.A. = 16h36m15s.7, Decl. = +58 15'55", equinox 1950.0, Catalogue of Principal Galaxies) was obtained, indicating that MCG +10-24-007 is an active galaxy. From the H-alpha and S II emission lines, we derive a redshift of 0.05. A spectrogram of SN 1992R (cf. IAUC 5494) obtained in the same run suggests that this object is a type-I supernova a few months after maximum. In addition, another brighter starlike object was found, located about 4" north of the SN 1992R; the spectrum of this object (SN 1992ac) corresponds to that of a type-Ia supernova about 1 month after maximum light." 1992 HE Improved orbital elements from MPC 20344: T = 1992 June 21.4519 TT Peri. = 262.9017 e = 0.566183 Node = 27.2559 2000.0 q = 0.958138 AU Incl. = 37.1872 a = 2.208624 AU n = 0.3002764 P = 3.282 years 1992 TT R. A. (2000) Decl. Delta r Elong. Phase V June 7 4 17.02 -45 52.3 0.585 0.977 69.4 76.5 15.5 17 4 17.88 -39 34.5 0.657 0.960 66.0 75.3 15.6 27 4 19.18 -34 04.2 0.715 0.961 64.7 73.0 15.7 July 7 4 21.01 -29 00.7 0.758 0.980 65.1 70.3 15.8 17 4 23.10 -24 14.1 0.785 1.015 67.2 67.4 15.9 27 4 24.99 -19 39.8 0.794 1.064 70.8 64.4 15.9 Aug. 6 4 25.81 -15 14.0 0.788 1.123 76.0 61.2 15.9 16 4 24.54 -10 50.8 0.768 1.191 82.7 57.5 15.9 26 4 19.95 - 6 23.1 0.738 1.264 91.2 53.1 15.8 Sept. 5 4 10.47 - 1 42.5 0.703 1.340 101.6 47.4 15.7 15 3 54.54 + 3 17.9 0.670 1.419 114.2 40.3 15.5 1992 June 12 (5543) Daniel W. E. Green
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