------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 3021 2014 Aug 18 15.52UT 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 A1 (SIDING SPRING) Information for our southern hemisphere subscribers: Orbital elements (M.P.E.C. 2014-P53): Epoch 2014 Oct. 30.0 TT = JDT 2456960.5 T 2014 Oct. 25.30499 TT MPC q 1.3987340 (2000.0) P Q z -0.0003098 Peri. 2.42298 +0.49139137 -0.56134703 +/-0.0000008 Node 300.97632 -0.81156363 -0.57259434 e 1.0004333 Incl. 129.04336 -0.31606801 +0.59751589 >From 771 observations 2012 Oct. 4-2014 Aug. 11, mean residual 0".5. 1/a_orig = +0.000038 AU^{-1}, 1/a_fut = +0.000128 AU^{-1}. Epoch 2014 May 23.0 TT = JDT 2456800.5 T 2014 Oct. 25.32361 TT MPC q 1.3986992 (2000.0) P Q z -0.0005773 Peri. 2.43785 +0.49126815 -0.56128422 +/-0.0000010 Node 300.97728 -0.81170327 -0.57235997 e 1.0008075 Incl. 129.02739 -0.31590095 +0.59779938 >From 763 observations 2012 Oct. 4-2014 Aug. 7, mean residual 0".5. Epoch 2014 Dec. 9.0 TT = JDT 2457000.5 T 2014 Oct. 25.30421 TT MPC q 1.3987321 (2000.0) P Q z -0.0002979 Peri. 2.42238 +0.49139685 -0.56134131 +/-0.0000008 Node 300.97629 -0.81155786 -0.57260246 e 1.0004167 Incl. 129.04330 -0.31607433 +0.59751349 >From 771 observations 2012 Oct. 4-2014 Aug. 11, mean residual 0".5. Ephemeris: Date TT R. A. (2000) Decl. Delta r Elong. m1 2014 08 14 03 01 25.9 -51 24 54 1.1567 1.7377 106.2 8.7 2014 08 15 02 58 32.4 -52 34 55 1.1358 1.7296 107.1 8.7 2014 08 16 02 55 17.9 -53 47 13 1.1156 1.7215 107.9 8.6 2014 08 17 02 51 39.5 -55 01 47 1.0959 1.7135 108.7 8.5 2014 08 18 02 47 33.4 -56 18 32 1.0769 1.7056 109.4 8.5 2014 08 19 02 42 55.6 -57 37 21 1.0586 1.6977 110.1 8.4 2014 08 20 02 37 40.8 -58 58 03 1.0409 1.6899 110.8 8.4 2014 08 21 02 31 43.1 -60 20 26 1.0241 1.6822 111.4 8.3 2014 08 22 02 24 54.9 -61 44 11 1.0081 1.6745 112.0 8.3 2014 08 23 02 17 07.5 -63 08 54 0.9929 1.6669 112.5 8.2 2014 08 24 02 08 10.1 -64 34 03 0.9786 1.6594 113.0 8.2 2014 08 25 01 57 49.9 -65 58 57 0.9653 1.6519 113.4 8.1 2014 08 26 01 45 51.9 -67 22 44 0.9529 1.6445 113.7 8.1 2014 08 27 01 31 58.6 -68 44 19 0.9416 1.6372 114.0 8.0 2014 08 28 01 15 50.7 -70 02 19 0.9313 1.6300 114.1 8.0 2014 08 29 00 57 08.6 -71 15 01 0.9221 1.6229 114.2 7.9 2014 08 30 00 35 35.2 -72 20 22 0.9141 1.6158 114.2 7.9 2014 08 31 00 11 01.1 -73 16 01 0.9072 1.6088 114.0 7.9 Guy M Hurst