------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 2539 2009 Apr 08 15.35UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074 INTERNET: GUY@TAHQ.DEMON.CO.UK Backup: gmh@wdcc1.bnsc.rl.ac.uk WORLD WIDE WEB http://www.theastronomer.org ------------------------------------------------------------------- COMET C/2009 F6 (YI-SWAN) Further to the note on TA E-Circular 2538, Brian Marsden provides the following orbital elements and ephemeris for this comet on MPEC 2009-G21: Orbital elements: C/2009 F6 (Yi-SWAN) T 2009 May 8.056 TT MPC q 1.26991 (2000.0) P Q Peri. 130.432 -0.044570 -0.165890 Node 278.927 +0.293971 +0.940278 e 1.0 Incl. 85.724 +0.954774 -0.297252 >From 63 observations 2009 Apr. 6-7. Ephemeris: C/2009 F6 (Yi-SWAN) Date TT R. A. (2000) Decl. Delta r Elong. m1 m2 2009 03 30 23 00.60 +51 32.8 1.780 1.401 51.7 8.7 2009 04 09 00 17.06 +55 33.7 1.764 1.344 49.2 8.5 2009 04 19 01 42.16 +56 33.3 1.793 1.303 45.5 8.4 2009 04 29 03 00.43 +54 29.8 1.859 1.277 40.7 8.4 2009 05 09 04 02.51 +50 26.3 1.954 1.270 35.2 8.5 2009 05 19 04 49.13 +45 30.6 2.066 1.281 29.2 8.7 Dan Green, Central Bureau, reports on IAUC 9035 that Hitoshi Yamaoka, Japan, indicates that he received an e-mailed report on March 28 of the discovery by Dae-am Yi (Yeongwol-kun, Gangwon-do, Korea) of a possible comet with a noticeable greenish coma of diameter about 1' on two 60-s CCD exposures taken about 80 seconds apart with a Canon 5D camera and a 90-mm f/2.8 camera lens. Orbital calculations suggest that this object is identical with C/2009 F6: 2009 UT R.A. (2000) Decl. Mag. Observer Mar. 26.835 22 39 40 +49 49 08 12.5 Yi The comet has consequently been re-named as C/2009 F6 (Yi-SWAN) Guy M Hurst