2020 March 31. 13:02:26 UT Orbital elements: C/2019 S4 (Lemmon) Epoch 2020 Apr. 21.0 TT = JDT 2458960.5 T 2020 Apr. 7.94370 TT Sato q 3.4416981 (2000.0) P Q z +0.0041596 Peri. 71.35578 +0.17416671 -0.41760451 +/-0.0000078 Node 63.16845 -0.12879702 -0.90750273 e 0.9856839 Incl. 92.02444 +0.97625677 -0.04522462 From 71 observations 2019 Sept. 17-2020 Feb. 20, mean residual 0".40. Epoch 2020 Mar. 12.0 TT = JDT 2458920.5 T 2020 Apr. 7.94076 TT Sato q 3.4416986 (2000.0) P Q z +0.0041415 Peri. 71.35518 +0.17417135 -0.41759673 +/-0.0000078 Node 63.16881 -0.12878726 -0.90750677 e 0.9857461 Incl. 92.02457 +0.97625723 -0.04521547 Residuals in seconds of arc 190917 G96 0.1+ 0.3- 190930 I52 0.0 0.3- 191124 461 0.2- 0.1+ 190917 G96 0.4- 0.5- 190930 I52 0.3+ 0.1- 191124 461 0.2- 0.1+ 190917 G96 0.4- 0.3- 191002 711 0.2- 0.1- 191124 461 0.2- 0.0 190917 G96 0.0 0.1- 191002 711 0.1+ 0.3- 191124 461 0.2- 0.1+ 190917 G96 0.0 0.1+ 191002 711 0.0 0.4- 191124 461 0.1- 0.2+ 190917 G96 0.6+ 0.4+ 191002 I52 0.1+ 0.1+ 191124 461 0.1- 0.2+ 190917 G96 0.5+ 0.7+ 191002 I52 0.2+ 0.1+ 191217 H06 0.1- 0.2+ 190917 G96 0.8+ 1.6+ 191002 I52 0.1+ 0.6- 191217 H06 0.1+ 0.3+ 190918 G96 0.6- 0.3- 191002 I52 0.1+ 0.6- 191226 461 0.2+ 0.0 190918 G96 0.6- 0.1+ 191003 I52 0.0 0.9- 191226 461 0.4+ 0.0 190918 G96 0.2+ 0.3- 191003 I52 0.5+ 0.8- 191226 461 0.2+ 0.1- 190918 G96 0.5- 0.6- 191003 I52 0.2+ 0.6- 191229 215 0.1+ 0.2+ 190919 G96 0.3+ 0.2+ 191003 I52 0.1- 1.0- 191229 215 0.7+ 0.6- 190919 G96 0.0 0.3+ 191024 568 0.0 0.3+ 191229 215 0.4- 0.6+ 190919 G96 0.1+ 0.1- 191024 568 0.1- 0.4+ 191231 461 0.4- 0.3+ 190920 L01 0.5- 0.1+ 191024 568 0.0 0.3+ 191231 461 0.1- 0.3+ 190920 L01 0.5- 0.1- 191027 C95 0.0 0.0 200101 461 0.1- 0.2+ 190920 L01 0.1- 0.2+ 191027 C95 0.7- 0.5+ 200101 461 0.1- 0.3+ 190927 K88 0.1- 0.3+ 191027 C95 0.3+ 0.0 200101 L27 0.6+ 0.4- 190927 K88 0.1+ 0.1+ 191030 Q11 0.0 0.3- 200101 L27 0.9+ 1.4- 190927 K88 0.0 0.2+ 191030 Q11 0.0 0.1+ 200220 461 0.4- 0.0 190927 H06 0.4- 1.0+ 191030 Q11 0.1+ 0.1+ 200220 461 0.2- 0.1- 190927 H06 0.2+ 0.9+ 191102 H06 0.1+ 0.4+ 200220 461 0.1- 0.0 190930 I52 0.4- 0.3- 191102 H06 0.3- 0.4+ 2020 January 9, 05:23:53 UT Orbital elements: Comet A/2019 S4 Epoch 2020 Apr. 21.0 TT = JDT 2458960.5 T 2020 Apr. 7.94912 TT Sato q 3.4416587 (2000.0) P Q z +0.0041814 Peri. 71.35671 +0.17415397 -0.41761828 +/-0.0000134 Node 63.16791 -0.12880934 -0.90749572 e 0.9856092 Incl. 92.02386 +0.97625742 -0.04523812 From 68 observations 2019 Sept. 17-2020 Jan. 1, mean residual 0".40. 2020 January 8, 02:07:58 UT Orbital elements: Comet A/2019 S4 Epoch 2020 Apr. 21.0 TT = JDT 2458960.5 T 2020 Apr. 7.95220 TT Sato q 3.4416483 (2000.0) P Q z +0.0041466 Peri. 71.35830 +0.17415114 -0.41760751 +/-0.0000349 Node 63.16868 -0.12883797 -0.90749917 e 0.9857288 Incl. 92.02470 +0.97625415 -0.04526846 From 54 observations 2019 Sept. 17-Nov. 24, mean residual 0".38. --