THE ASTRONOMER Electronic Circular No 689 1992 Dec 2 21.01UT 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 TELECOM GOLD: 10074:MIK2885 GMH at UK.AC.RUTHERFORD.STARLINK.ASTROPHYSICS STARLINK: RLSAC::GMH GMH at UK.AC.CAM.ASTRONOMY.STARLINK STARLINK: CAVAD::GMH ------------------------------------------------------------------- PERIODIC SWIFT-TUTTLE (1992t) Graeme Waddington, Oxford e-mails that further integration runs have been on this comet based on orbital elements by Yeomans (MPC 21081) and with a small nongravitional A2 force included. Using A2=-0.00025 (cf P/Halley has A2=0.0155) most apparitions back to 317AD are virtually unaffected. The 188 apparition's perihelion time moves by a month with the result that the -69 April perihelion time is moved to -68 August 30. The oriental records of the comet of -68 are compatible with P/Swift-Tuttle and a perihelion time of about August 25. It seems probable that the -68 and 188 comets are therefore Comet Swift-Tuttle. V795 CYGNI Patrick Schmeer, Germany has reported an outburst of this UGSS star on 1992 Nov 23.760UT at magnitude 12.8 visual. This was subsequently confirmed as follows: 1992 Nov 23.847UT, 13.0: (W.Worraker, Didcot, UK); 25.374UT, V=12.8 (Taichi Kato, Japan). Patrick advises us that the previous recorded maximum was on 1991 Sept 3 at mv=13.3 The position is: RA 19h32m38s DEC +31 25.6'(1950) V407 CYGNI Taichi Kato, Japan e-mails that M.Yamada, Ishikawa, Japan has observed V407 Cygni to be bright: 1992 Nov 22.449UT, 12.6. The brightening was confirmed by Kato on Nov 23 at V=12.0. Subsequently Patrick Schmeer, Germany reported it at magnitude 12.0 on Nov 26.853UT. The star was discovered by C.Hoffmeister on Sonneberg plates with a major outburst in 1936. He classified it as nova-like. The GCVS mentions that there are also light variations of Mira-type superimposed on the rare outburst events. The position is: RA 21h00m26s DEC +45 34.6' (1950) IP PEGASI Professional astronomers using Hubble have asked for immediate advice at the next outburst of IP Pegasi. Please telephone Gary Poyner immediately the star starts to rise. His telephone number is: 021-350-4312. Please also e-mail this box in confirmation. An outburst is likely during this month. Guy M Hurst