THE ASTRONOMER Electronic Circular No 518 1991 May 05 15.46UT 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 ------------------------------------------------------------------- NOVA HERCULIS 1991 Since the e-chart details published on E513, Rob McNaught has faxed details of photoelectric measurements of comparisons kindly carried out by Tom Harrison of Mount Stromlo Observatory. The following new extended sequence is available: a) New comparisons Comparison Offsets from nova in arcsecs V mag d 95E 91N 12.58 g 93W 4N 13.15 e 40E 55N 13.77 b 97E 19N 13.87 c 110E 70N 14.10 f 57W 6S 14.35 a 127E 21S 14.54 h 8E 29N 15.67 b) Revision to existing comparisons Comparison Old Value New Value Z 13.45 12.9 1 14.02 13.8 2 14.58 14.8 The sequence revisions are under references: TA: GMH 910505 BAA: N/015.02 A new paper version of the (c) chart is available on e-mail request. In order that the editor can undertake a detailed analysis of all observations reported to date, please re-submit all observations by e-mail with date, UT(in decimal), full estimate (eg A(1)v(1)B), reduced magnitude, class, instrument, sequence. If comparisons other than those published in our e-circulars have been used, please send details of their location and your adopted values. Recent visual estimates (not yet reduced to new sequence): 1991 Apr 18.98, 12.4v (Granslo); 19.2, 13.0v (Halbach); 19.97, 12.5v (Granslo); 20.08, 12.8v (Midtskogen); 21.05, 12.5v (Granslo); 21.06, 13.3v (Verdenet); 21.088,13.0v (Schmeer); 22.079,13.1v (Schmeer); 22.17, 12.7v (Pereira); 23.07, 13.3v (Poyner); 23.11, 13.2pv(Mikuz) ; 23.33, 13.2v (McKenna); 23.960,13.5v (Worraker);24.5, 13.3v (Halbach); 26.076,13.9V (Mikuz); SS CYGNI We have received a request from the ROSAT team for all estimates of SS Cygni made during 1990 November and December to assist them with their analysis. Please e-mail observations quoting date, UT decimal and magnitude as soon as possible. UZ BOOTIS Gary Poyner, Birmingham, reports a minor outburst of UZ Boo: 1991 May 1.97UT, 14.8 Guy M Hurst