THE ASTRONOMER Electronic Circular No 628 1992 Apr 19 08.14UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP,England. Telephone/FAX(0256)471074 Int:+44256471074 Telex: 9312111261 Answerback: TA G JANET BOXES: GMH at UK.AC.CAM.ASTRONOMY.STARLINK or GUYH at UK.AC.SUSSEX.CLUSTER TELECOM GOLD: 10074:MIK2885 PRESTEL 256471074 ------------------------------------------------------------------- COMET MUELLER (1992g) Jean Mueller, Palomar Observatory, reports her discovery of a probable comet on a 90-min IIIa-J exposure on Apr. 9 by C. Brewer and herself (the same plate on which SN 1992S was found) for PSSII. 1992 UT R.A. (2000) Decl. m1 Apr. 9.34583 14 13 06.61 +27 51 03.7 9.40833 14 13 04.99 +27 51 36.0 17.5 11.39514 14 12 05.31 +28 11 16.3 11.41597 14 12 04.90 +28 11 23.7 IAUC 5495 SUPERNOVAE 1992Q, 1992R, 1992S J. Mueller, Palomar Observatory, reports her discovery of three probable supernovae on plates taken with the 1.2-m Oschin telescope by C. Brewer, J. D. Mendenhall and herself in the course of the Second Palomar Sky Survey. SN 1992Q, at R.A. = 12 08 27.77, Decl. = -1 36 09.5 (equinox 1950.0, reduction by D. Levy), is 4".7 west and 10".7 south of the centre of an anonymous galaxy; on the Apr. 7 discovery plate the object was of blue mag about 18.5; observations in nonphotometric conditions by J. Mould and J. Jensen with the Palomar 1.5-m reflector confirm this to be a blue object, and examination by N. Reid of a similar PSS II plate taken some years ago does not show any object at the position. SN 1992R is clearly visible on a spiral arm of the galaxy MCG +10-24-007 (R.A. = 16 36.2, Decl. = +58 16, equinox 1950.0), 12".7 east and 4" south of the nucleus; on the Apr.8 discovery plate it was of blue mag about 18. SN 1992S, at R.A. = 14 15 31.36, Decl. = +31 16 49.0 (equinox 1950.0), is 14".8 east of the nucleus of an anonymous galaxy on what appears to be a spiral arm; this object, of blue mag about 18.5, was found on an Apr. 9 exp. and confirmed on Apr. 11. IAUC 5494 PERIODIC COMET SHOEMAKER-LEVY 8 (1992f) Elliptical orbital elements by Nakano from the eight observations: T = 1992 May 21.033 TT Peri. = 16.555 e = 0.29487 Node = 213.363 2000.0 q = 2.72425 AU Incl. = 6.022 a = 3.86345 AU n = 0.129790 P = 7.59 years 1992 TT R. A. (2000) Decl. Delta r Elong. m1 Apr. 8 15 12.43 -16 56.3 1.833 2.735 148.2 16.7 18 15 08.36 -16 13.3 1.769 2.731 159.1 16.6 28 15 02.76 -15 23.1 1.730 2.727 170.3 16.5 May 8 14 56.38 -14 29.7 1.717 2.725 177.1 16.5 18 14 50.14 -13 38.4 1.730 2.724 166.6 16.5 IAUC 5495 EY CYGNI Further estimates of the outburst by Patrick Schmeer, Germany unless otherwise stated (cf E622): 1992 Mar 30.104UT, 11.7 (Mike Collins, UK, 135mmFL+K2415); Apr 2.049, 11.7; 6.077, 12.1; 7.031, 12.1; 8.058, 12.2; 9.089, 12.4; 10.04, 12.8 (Timo Kinnunen, Finland); 10.080, 12.7; 11.103, 12.9; 12.056, 13.1 SW URSAE MAJORIS Further estimates of the current outburst by Schmeer(cf E622): 1992 Mar 27.810, 11.8; 28.860, 11.9; 30.795, 12.1; Apr 1.826, 12.3; 2.938, 13.1; 5.928, [13.7 Guy M Hurst