THE ASTRONOMER Electronic Circular No 572 1991 October 21 15.56UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP, England. Telephone: (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 ------------------------------------------------------------------- LD 22 Mike Collins, Sandy, reports that he has discovered a variable star in Cygnus on photographs taken for the UK Nova/Supernova Patrol on 1991 October 3.9UT. The star is located at: RA 20h 18m 58s DEC +49 33' (1950) and was estimated at 10.2. The object has been identified as LD 22, the 22nd star in a series announced by Lennart Dahlmark of Sweden on IBVS 2157 (1982). It is listed there as having a range of 12.2-[15.0v and B-V in excess of 2 magnitudes which probably explains the much brighter estimate by Mike Collins being based on Kodak 2415 film. The editor estimates the following magnitudes from atlases: Lick 1954 Sept 3 [15 B(Not recorded) Stellarum 1969 July 14 14:B Papadopoulos 1976 July 26 12.4pv Mike Collins notes that the star is not catalogued in the GSC or the IRAS PSC. The e-mail chart below adopts the new format detailed on E567. \\\\\\ LD22(c) preliminary S,90,10,S P,20h 18m 58s +49 33' (1950) O,44,46,10.2,? -S,TA 911020 R,10.2,56,49,A,B R,11.6,30,36,B,B R,12.3,63,51,C,B R,12.7,62,25,D,B R,13.3,44,23,E,B M,9,80,52 M,12,40,83,13,65,53,83,86,87,67,8 M,12,77,53,64,89,58,88 M,13,67,74,86,47,38,25,14,57,45,78, M,13,68,58,6,84,35,48,83,51,28,37,66,44,9,61 M,13,67,39,6,84,42,75 M,13,34,31 M,14,66,56,66,4,3,32,11,60,38,64,39,47 E,37 ////// Basic chart automatically generated by GSC2FIND ver 1.0 SUPERNOVA 1991bb IN UGC 2892 J. Mueller reports her discovery of a supernova (mag about 18) in UGC 2892 (R.A. = 3h50m.7, Decl. = +18 57', equinox 1950.0), found on a red plate taken by J. D. Mendenhall and Mueller on Oct. 13 with the 1.2-m Oschin Telescope in the course of the second Palomar Sky Survey. SN 1991bb is located 9".4 east and 2" north of the galaxy nucleus. A. V. Filippenko and T. Matheson, University of California at Berkeley, report that broadband CCD images of UGC 2892 obtained on Oct. 14 UT with the Nickel 1-m reflector at Lick Observatory confirm the presence of the candidate. The object appears bluer than the nearby galactic nucleus, and it may be brighter than reported by Mueller. At their request, R. Cohen, R. Lyons, and E. M. Burbidge (University of California at San Diego) obtained a CCD spectrum (range 310-870 nm, resolution 1 nm) with the Shane 3-m reflector at Lick. Preliminary inspection of the uncalibrated spectrum shows that the object is indeed a supernova, probably of type Ia; a reasonably deep absorption trough near 620 nm is present. IAUC 5365 Guy M Hurst