Circular No. 5076 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 1990W IN NGC 6221 R. Evans, Hazelbrook, N.S.W., reports his visual discovery of a supernova in NGC 6221 (R.A. = 16h48m.5, Decl. -59 08', equinox 1950.0); he estimated the supernova to be at mag about 15 on Aug. 16.4 (discovery observation) and 18.4 UT, with offsets from the nearly stellar nucleus being 5" east, 3" north. The supernova was not noticed during Evans' previous observation of the galaxy on Aug. 10. E. Sadler, Anglo-Australian Observatory, communicates, via R. H. McNaught: "An Anglo-Australian Telescope spectrum (range 470-550 nm) taken Aug. 18.4 UT indicates that this is probably a type-I supernova, located in or near an H II region. The coordinates measured from the AAT are R.A. = 16h48m26s.8, Decl. = -59 07'54" (equinox 1950.0) with magnitude V about 15." SUPERNOVA 1990X IN UGC 12565 C. Pollas, Observatoire de la Cote d'Azur, reports his discovery on plates taken Aug. 17.12 and 18.12 UT of an apparent supernova at mpg = 19 in the spiral galaxy UGC 12565 (mpg = 15.4). The object is at R.A. = 23h20m15s.8, Decl. = +22 56'07" (equinox 1950.0); offsets from the galaxy's center are 12" west, 20" south. COMET LEVY (1990c) J. J. Klavetter, University of Maryland, reports the following preliminary broadband magnitudes of comet Levy taken on Aug. 11.5 UT with the ProtoCAM at the NASA Infrared Telescope Facility: H = 3.95 +/- 0.02, J = 3.54 +/- 0.03, K = 4.07 +/- 0.03, L = 4.80 +/- 0.10. Total visual magnitude estimates (cf. IAUC 5075): Aug. 15.46 UT, 4.0 (D. Tholen, Mauna Kea, Hawaii, naked eye); 16.93, 4.0 (H. Dahle, Oslo, Norway, naked eye); 17.24, 3.9 (C. S. Morris, near Mt. Wilson, CA, naked eye); 18.24, 3.7 (Morris, Lockwood Valley, CA). PERIODIC COMET HONDA-MRKOS-PAJDUSAKOVA (1990f) Total visual magnitude estimates (cf. IAUC 5072): Aug. 16.90 UT, 9.4 (A. Pearce, Scarborough, W.A., 0.20-m reflector); 18.50, 8.1 (C. S. Morris, Pine Mountain Club, CA, 0.26-m reflector). 1990 August 18 (5076) Daniel W. E. Green
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