------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 3128 2015 Dec 17 22.05UT 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/2013 US10 (Catalina) This comet is now well placed for monitoring by the Northern hemisphere observers from whom impressive images are being received showing interesting configuration of tails. It will pass within 1 degree of Arcturus in early January making it easy to find although it is also bright with recent estimates in the 2015 December issue of 'The Astronomer' (in press) indicating magnitude 6 by the end of November. Further observations are encouraged: T 2015 Nov. 15.7204 TT MPC q 0.822975 (2000.0) P Q z -0.000391 Peri. 340.3582 -0.9056043 -0.4205005 +/-0.000001 Node 186.1441 -0.2858727 +0.5088429 e 1.000322 Incl. 148.8785 -0.3133011 +0.7511712 Date TT R. A. (2000) Decl. Delta r Elong. Phase m1 2015 12 16 14 17 33.7 -01 02 37 1.2337 0.9976 52.0 51.0 4.8 2015 12 17 14 17 28.0 -00 09 39 1.2120 1.0079 53.4 51.6 4.9 2015 12 18 14 17 21.9 +00 45 17 1.1902 1.0184 54.9 52.2 4.9 2015 12 19 14 17 15.4 +01 42 18 1.1684 1.0290 56.3 52.7 4.9 2015 12 20 14 17 08.2 +02 41 32 1.1466 1.0399 57.8 53.2 4.9 2015 12 21 14 17 00.3 +03 43 07 1.1249 1.0508 59.3 53.6 4.9 2015 12 22 14 16 51.6 +04 47 12 1.1032 1.0620 60.9 54.0 4.9 2015 12 23 14 16 41.9 +05 53 55 1.0816 1.0732 62.4 54.3 4.9 2015 12 24 14 16 31.0 +07 03 28 1.0601 1.0846 64.0 54.6 4.9 2015 12 25 14 16 18.9 +08 15 59 1.0388 1.0962 65.6 54.8 4.9 2015 12 26 14 16 05.3 +09 31 40 1.0177 1.1079 67.2 54.9 4.9 2015 12 27 14 15 50.0 +10 50 39 0.9969 1.1196 68.9 55.0 4.9 2015 12 28 14 15 32.8 +12 13 10 0.9764 1.1315 70.5 55.0 4.9 2015 12 29 14 15 13.4 +13 39 21 0.9563 1.1435 72.2 55.0 4.9 2015 12 30 14 14 51.6 +15 09 24 0.9365 1.1556 74.0 54.9 4.9 2015 12 31 14 14 27.0 +16 43 30 0.9172 1.1678 75.7 54.7 4.9 Guy M Hurst