2018 January 17, 22:21:18 UT Orbital elements: C/2018 A1 (PANSTARRS) Epoch 2017 Oct. 14.0 TT = JDT 2458040.5 T 2017 Oct. 20.58161 TT Sato q 2.4192462 (2000.0) P Q n 0.00782214 Peri. 96.43787 +0.13129956 -0.93856498 a 25.1334554 Node 336.62450 +0.22003818 +0.34149750 e 0.9037440 Incl. 53.55214 +0.96661452 +0.04975166 P 126.00 From 36 observations 2018 Jan. 6-12, mean residual 0".35. Epoch 2018 Feb. 11.0 TT = JDT 2458160.5 T 2017 Oct. 20.58130 TT Sato q 2.4192520 (2000.0) P Q n 0.00783334 Peri. 96.43922 +0.13129093 -0.93855803 a 25.1094973 Node 336.62284 +0.22003291 +0.34151841 e 0.9036519 Incl. 53.55276 +0.96661689 +0.04973932 P 125.82 Residuals in seconds of arc 180106 F51 0.3+ 0.4- 180108 L04 0.1- 0.3- 180110 G40 0.3- 0.2- 180106 F51 0.6+ 0.0 180108 K88 0.6- 0.3- 180110 G40 0.5+ 0.3+ 180106 F51 0.5+ 0.0 180108 K88 0.4- 0.1+ 180111 G40 0.4+ 0.4- 180106 F51 0.6+ 0.1- 180108 K88 0.2- 0.0 180111 G40 0.1+ 0.4- 180107 J95 0.3- 0.1- 180109 033 0.1+ 0.0 180112 349 0.2- 0.2- 180107 J95 0.1- 0.3- 180109 033 0.2+ 0.1+ 180112 349 0.4- 0.1+ 180107 J95 0.7- 0.1+ 180109 033 0.3+ 0.1- 180112 Q11 0.0 0.5+ 180107 J95 0.2- 0.2+ 180109 033 0.2+ 0.2- 180112 Q11 0.0 0.5+ 180107 J95 0.1- 0.4+ 180109 033 0.3+ 0.2- 180115 Q11 0.3+ 0.3+ 180108 H36 0.4+ 0.1+ 180109 033 0.4+ 0.1- 180115 Q11 0.2+ 0.1+ 180108 H36 0.2- 0.4+ 180110 033 0.1+ 0.1+ 180117 Q11 0.2- 0.2- 180108 H36 1.4- 0.8+ 180110 033 0.3+ 0.1- 180117 Q11 (0.2+ 0.4+) 180108 L04 0.3- 0.1+ 180110 033 0.5+ 0.2- 180117 Q11 0.1- 0.3- 180108 L04 0.6- 0.1+ 180110 033 0.3+ 0.3- 2018 January 12, 00:42:38 UT Orbit-1 Orbital elements: C/2018 A1 (PANSTARRS) T 2017 Nov. 16.61990 TT Sato q 2.6391159 (2000.0) P Q Peri. 108.92365 -0.05305917 -0.92299258 Node 332.91270 +0.24330888 +0.35822784 e 1.0 Incl. 56.82844 +0.96849652 -0.14056140 From 32 observations 2018 Jan. 6-11, mean residual 0".54. Orbit-2 Orbital elements: C/2018 A1 (PANSTARRS)1 T 2017 Oct. 12.05343 TT Sato q 2.3699706 (2000.0) P Q n 0.00770432 Peri. 92.38505 +0.19229300 -0.93222957 a 25.3890524 Node 337.43126 +0.20652792 +0.34382511 e 0.9066538 Incl. 53.00942 +0.95935896 +0.11283757 P 127.93 From 32 observations 2018 Jan. 6-11, mean residual 0".29. --