THE ASTRONOMER Electronic Circular No 437 1990 Aug 19 11.58UT 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 --------------------------------------------------------------------- DWARF NOVA IN PAVO J. Maza, Astronomy Department, University of Chile; and M. Hamuy, Cerro Tololo Interamerican Observatory, report: "M.Wischnjewsky has discovered an apparent dwarf nova in Pavo. The object, which was recorded at estimated mpg = 14.5 on a 15-min 103a-O plate taken by Hamuy and L. Wells with the Curtis Schmidt telescope on July 21.086 UT, coincides in position with a star of mag 20 on the ESO Quick Blue Sky Survey plate: R.A. = 19h11m33s.5, Decl. = -62 41'10" (equinox 1950.0). A spectrum (range 630-950 nm) was obtained on July 26 by M. Phillips with the CTIO 4-m telescope; the object had faded several magnitudes by this date and showed broad H-alpha emission. A search by S. Barros of plates obtained between 1979 May and 1984 Sept. with the 0.70-m Maksutov camera at the Cerro Roble Observatory revealed two previous outbursts. The first occurred on 1983 Sept.1, when the object was observed at estimated mpg = 14.5 for three consecutive nights; on plates taken a month later, the object had disappeared (mpg >/= 20). The second outburst was recorded in a plate taken on 1984 Mar. 2, on which the object was observed at estimated mpg = 16; on 1984 Mar. 4, the object had again faded to mpg >/= 20." IAUC 5073 SUPERNOVA 1990V IN NGC 7564 J. Mueller reports her discovery of a supernova in NGC 7564 (R.A. = 23h13m.1, Decl. = +7 01', equinox 1950.0), located 11".4 east and 16".1 south of the galaxy's center. The SN appears at mag about 18 on a blue plate taken July 29 UT with the 1.2-m Oschin Schmidt telescope in the course of the second Palomar Sky Survey. A spectrum (range 380-550 and 590-790 nm) obtained on Aug. 15 by M. Strauss and S. Strauss on the 5-m Hale Telescope (+ double spectro- graph) shows the presence of broad H-alpha (FWHM about 10 000 km/s) and H-beta, confirming the object as a type-II SN. IAUC 5074 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." IAUC 5076 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. IAUC 5076 UU AQUILAE Stefan Korth, W.Germany, e-mails that this UG star was seen on 1990 Aug 12.912UT at 11.4 but fainter than 14.0 on Aug 10.898UT. He last saw the star in November 1989. Guy M Hurst