2018 March 23, 13:30:23 UT Orbital elements: C/2018 F1 (Grauer) Epoch 2018 Dec. 8.0 TT = JDT 2458460.5 T 2018 Dec. 14.07469 TT Sato q 2.9930745 (2000.0) P Q z +0.0030728 Peri. 71.62159 -0.34604382 +0.93760112 +/-0.0000341 Node 177.29205 -0.86156995 -0.33192182 e 0.9908029 Incl. 46.07235 +0.37141741 +0.10359561 From 60 observations 2017 Dec. 22-2018 Mar. 22, mean residual 0".34. Epoch 2018 May 2.0 TT = JDT 2458240.5 T 2018 Dec. 14.09567 TT Sato q 2.9930453 (2000.0) P Q z +0.0031224 Peri. 71.61560 -0.34598434 +0.93762898 +/-0.0000341 Node 177.30554 -0.86154038 -0.33178617 e 0.9906545 Incl. 46.08329 +0.37154140 +0.10377785 Residuals in seconds of arc 171222 F51 0.1- 0.0 180317 I52 0.0 0.2+ 180318 G96 0.1- 0.0 171222 F51 0.1+ 0.1- 180317 I52 0.1- 0.1+ 180318 G96 0.0 0.1+ 171222 F51 0.0 0.2- 180317 I52 0.2+ 0.2+ 180318 G96 0.1- 0.2+ 171222 F51 0.0 0.1+ 180317 F51 0.4+ 0.1+ 180318 G96 0.1- 0.2- 180117 F51 0.1+ 0.1- 180317 F51 0.3+ 0.0 180319 G40 0.0 0.3- 180117 F51 0.1- 0.4+ 180317 I52 0.3+ 0.1+ 180319 G40 0.3- 0.1+ 180223 G96 0.0 0.1+ 180317 I52 0.3+ 0.3- 180319 W96 0.0 0.3+ 180223 G96 0.1- 0.1+ 180317 I52 0.5- 0.1- 180319 W96 0.3+ 0.2+ 180223 G96 0.0 0.2- 180317 I52 0.3- 0.1+ 180319 W96 0.4+ 0.1+ 180223 G96 0.1- 0.1+ 180317 B49 1.0- 0.4- 180319 I52 0.9+ 0.6- 180310 F51 0.3+ 0.0 180317 B49 1.0- 0.5- 180319 I52 0.3+ 0.0 180310 F51 0.3+ 0.0 180317 B49 1.0- 0.7- 180319 I52 0.2+ 0.2- 180310 F51 0.3+ 0.0 180318 850 0.8- 0.9- 180319 I52 0.2+ 0.2+ 180317 G96 0.0 0.0 180318 850 0.0 0.2- 180319 F51 0.3+ 0.1+ 180317 G96 0.0 0.0 180318 850 0.1+ 0.8+ 180319 F51 0.3+ 0.2+ 180317 G96 0.2- 0.1- 180318 850 0.8+ 0.2- 180319 F51 0.4+ 0.2+ 180317 G96 0.2- 0.6+ 180318 I52 0.3- 0.1+ 180319 F51 0.3+ 0.1+ 180317 F51 0.3+ 0.0 180318 I52 0.4- 0.7- 180322 Q11 0.3- 0.2+ 180317 F51 0.4+ 0.1+ 180318 I52 0.4- 0.2+ 180322 Q11 0.4- 0.1+ 180317 I52 0.3+ 0.1+ 180318 I52 0.2- 0.5+ 180322 Q11 0.1- 0.2+ 2018 March 20, 00:47:05 UT Orbital elements: C/2018 F1 (Grauer) Epoch 2018 Mar. 23.0 TT = JDT 2458200.5 T 2018 Dec. 14.11528 TT Sato q 2.9930489 (2000.0) P Q z +0.0031629 Peri. 71.61712 -0.34594314 +0.93764470 +/-0.0000356 Node 177.30684 -0.86153550 -0.33173697 e 0.9905333 Incl. 46.08657 +0.37159107 +0.10379308 DIS = 4.5 AU, 1/a = , Q = 629.3 AU Epoch 2018 Dec. 28.0 TT = JDT 2458480.5 T 2018 Dec. 14.07503 TT Sato q 2.9931263 (2000.0) P Q z +0.0030768 Peri. 71.62172 -0.34605881 +0.93759490 +/-0.0000356 Node 177.29053 -0.86156394 -0.33194312 e 0.9907908 Incl. 46.07209 +0.37141740 +0.10358362 From 57 observations 2017 Dec. 22-2018 Mar. 19, mean residual 0".34. --