THE ASTRONOMER Electronic Circular No 426 1990 June 29 19.07UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP, England. Telephone: (0256)471074 Int:+44256471074 Telex: 94082518 Answerback: TAGUY Microlink: MAG60138 JANET:GMH @ UK.AC.CAM.ASTRONOMY.STARLINK or GUYH@UK.AC.SUSSEX.CLUSTER --------------------------------------------------------------------- 1990 MF E. F. Helin reports her discovery of a fast-moving asteroidal object on films exposed by Helin, B. Roman, K. Lawrence, and J. Michaud with the 0.46-m Schmidt telescope at Palomar. Measurements by Roman: 1990 UT R.A. (1950) Decl. Mag. June 26.24809 16 23 11.09 + 2 03 35.2 15.2 26.27535 16 23 08.81 + 2 06 15.1 27.21372 16 22 28.97 + 3 43 02.8 15.0 27.37101 16 22 15.64 + 4 00 18.1 The following preliminary orbital elements are very uncertain but indicate that this is an Apollo-type object: T = 1990 Aug. 8.84 ET Peri. = 117.99 e = 0.4752 Node = 205.61 1950.0 q = 0.9475 AU Incl. = 1.80 a = 1.8055 AU n = 0.40627 P = 2.43 years 1990 ET R.A. (1950) Decl. Delta r V June 28 16 21.85 + 5 13.7 30 16 20.16 + 9 46.6 0.061 1.060 14.1 July 2 16 18.17 +15 45.4 4 16 15.58 +23 48.4 0.045 1.040 13.7 6 16 11.76 +34 45.2 8 16 04.96 +49 14.0 0.034 1.022 13.8 9 15 58.85 +57 40.9 10 15 48.21 +66 35.5 0.032 1.013 14.3 11 15 25.2 +75 29.3 12 14 04.9 +83 33.3 0.034 1.005 15.1 13 7 55 +85 26.2 14 5 42.9 +79 26.2 0.038 0.998 16.0 15 5 12.7 +73 25.8 16 5 00.16 +68 09.1 0.044 0.990 16.9 IAUC 5041 SUPERNOVA 1990Q IN NGC 5917 C. Pollas, Observatoire de la Cote d'Azur, reports his discovery, on a plate taken on June 24.89 UT by D. Albanese with the OCA Schmidt telescope, of an apparent supernova (mv about 18) in NGC 5917 (= Arp 254). The object is at R.A. = 15h18m52s.92, Decl. = -7 11'43".2 (equinox 1950.0), which is about 10".6 east and 11".0 north of the galaxy's center. M. Turatto, Asiago Astrophysical Observatory, reports that he, E. Cappellaro, and S.Benetti observed this object on June 26.87 UT with the Mt. Ekar 1.8-m telescope (+ CCD) under less-than-ideal photometric conditions, finding magnitudes V = 16.0, R = 15.6 and offset 10".1 east, 11".5 north. IAUC 5040 TA INDEX We are delighted to welcome Patrick Schmeer of Federal Republic of Germany back to the group. He can be contacted from JANET using MAIL: CBS%EARN-RELAY::EARN.DKLUNI01::KPHY17 Veikko Makela, of Helsinki, Finland becomes the first from that country to join the group and will receive messages on behalf of URSA Astronomical Association. Address via JANET is: CBS%EARN-RELAY::FI.HELSINKI.CC::PVTMAKELA Guy M Hurst