THE ASTRONOMER Electronic Circular No 675 1992 Oct 14 19.04UT 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 ------------------------------------------------------------------- FG SAGITTAE/TASV 2009+20 Details of the fading of this unique variable located at: RA 20h 09.7m DEC +20 11' [1950] were given in 'The Astronomer' Vol 29 No 341 p115 [1992]. FG Sagittae is the central star of the planetary nebula PK 60-7.1= He 1-5. It rose from 13.7B in 1890 to 9.5B in 1967. A cautionary note was placed in our original announcement regarding a companion of magnitude 14 about 8 arcseconds from FG Sge in PA 100. It is clear from recent results that most observers are now reporting estimates of the companion, which is evidently brighter than originally thought, rather than FG Sge. Bill Worraker, Didcot, has reported visually splitting the pair. By Oct 4.877UT he reports that the eastern object (companion) was 12.5 whereas the western star (FG Sge) had faded and was [13.7. A later report by Nick James indicates he has photographed both stars during full moon and FG Sge is now around magnitude 14. It therefore appears that the numerous estimates of around 12.5 received since late September do not relate to FG Sge. To further complicate the issue, Monsignor R.Royer (USA) has reported in AAVSO Alert Notice 163 that the companion may also vary! He mentions that the companion (hereby designated TASV 2009+20) has brightened from fainter than 13th magnitude this summer to reach approximately 12.1 and then has faded to 12.5. We therefore urge observers to report estimates of both stars using the extended sequence and chart given below: \\\\\\FG Sge c Companion 8" PA100 Var? S,120,10,S P,20h 09.7m +20 11' (1950) -C,20.1989, 20.3356, 2000 O,60,60,9.5,13.6B -S,TA921010 R,9.1,43,90,3 R,11.8,84,70,7 R,12.5,35,48,8 R,12.9,47,52,9 R,13.7,64,76,10 M,10,96,80 M,11,1,94,86,9,114,100 M,12,32,102,60,11,66,67,114,2,33,104,60,3 M,12,90,15,37,119 M,13,61,60 M,13,81,95,4,50,54,5,56,28,39,6,89,58,56,98 M,13,13,42,91,17,5,52,106,56,97,91,99,66,83,62 M,13,43,91,10,104,21,100,31,81,16,117,20,104,102,79 M,13,48,95,96,20,65,86,52,29 M,14,28,95,32,17,64,85,19,10,23,54,108,16 M,14,5,57,100,109 E,52 ////// Basic chart automatically generated by GSC2FIND ver 1.2 FINDERS The '-C' line in the above chart is part of a new finders program under test details of which will be announced shortly. This will still run on older versions although a cautionary error message may also appear after chart display, Guy M Hurst