2021 October 30, 08:17:44 UT Orbital elements: C/2021 T4 (Lemmon) Epoch 2023 Aug. 4.0 TT = JDT 2460160.5 T 2023 July 31.35591 TT Sato q 1.4834887 (2000.0) P Q z -0.0001343 Peri. 329.79846 +0.28303136 -0.90347782 +/- 0.00028 Node 257.88496 -0.80086832 -0.40729820 e 1.0001992 Incl. 160.77765 -0.52773402 +0.13355150 From 69 observations 2021 Aug. 7-Oct. 29, mean residual 0".42. Epoch 2021 Nov. 2.0 TT = JDT 2459520.5 T 2023 July 31.48028 TT Sato q 1.4826860 (2000.0) P Q z -0.0000269 Peri. 329.76212 +0.28218891 -0.90367388 +/- 0.00028 Node 257.80219 -0.80091535 -0.40672770 e 1.0000399 Incl. 160.75969 -0.52811364 +0.13396306 Residuals in seconds of arc 210807 F51 0.1- 0.1- 211009 595 0.5+ 0.6- 211016 104 0.2- 0.7- 210807 F51 0.2+ 0.2+ 211009 I93 0.1- 0.3- 211016 157 0.1+ 0.2+ 210807 F51 0.1- 0.0 211009 595 0.3+ 0.2- 211017 F52 0.5- 0.1- 210807 F51 0.0 0.1- 211009 H06 0.3+ 0.0 211017 F52 0.3- 0.0 210905 F52 0.1+ 0.0 211009 H06 0.2+ 0.0 211017 F52 0.4- 0.0 210905 F52 0.3+ 0.2+ 211009 G02 0.2+ 0.4+ 211027 V06 0.1- 0.0 210909 G96 0.4- 0.3+ 211010 G02 0.4+ 0.2- 211027 V06 0.1+ 0.1+ 210909 G96 0.3- 0.7- 211011 X02 0.1+ 0.5- 211027 V06 0.2- 0.0 210909 G96 0.2+ 0.2+ 211011 X02 0.1- 0.4- 211027 F51 0.3- 0.1- 210915 F52 0.1- 0.1- 211012 L01 0.7- 0.1- 211027 F51 0.4- 0.1- 210915 F52 0.1- 0.1- 211012 L01 0.6+ 0.0 211028 L06 0.1+ 0.4+ 211002 F51 0.0 0.2+ 211012 L01 0.0 1.0+ 211028 L06 0.2- 0.8- 211007 G96 0.1+ 0.0 211012 L01 0.1- 0.3+ 211028 G96 0.2+ 0.1- 211007 G96 0.2- 0.3- 211013 204 0.2+ 0.3+ 211028 G96 0.2+ 0.2- 211007 G96 0.3+ 0.3- 211013 204 0.2+ 0.3- 211028 G96 0.2- 0.1- 211007 G96 0.1+ 0.1- 211015 204 0.4+ 0.1- 211028 G96 0.1- 0.2- 211008 G96 0.1- 0.0 211015 204 0.1+ 0.0 211028 246 0.0 1.6+ 211008 G96 0.3+ 0.1+ 211015 G96 0.3+ 0.0 211028 246 (2.7+ 0.8+) 211008 G96 0.3+ 0.2+ 211015 G96 0.1+ 0.3- 211028 246 1.8+ 0.0 211008 G96 0.4+ 0.3- 211015 G96 0.4- 0.5- 211029 Q11 0.1- 0.3- 211008 N51 0.4- 1.5+ 211015 G96 0.2- 0.0 211029 Q11 0.3- 0.3- 211008 N51 1.9- 0.8+ 211016 104 0.5- 0.3+ 211029 Q11 0.0 0.0 211009 I93 0.7+ 0.2- 211016 157 0.0 0.5+ 211009 I93 0.3+ 0.7- 211016 104 0.6- 0.4+ 2021 October 29, 06:30:04 UT Orbital elements: C/2021 T4 (Lemmon) Epoch 2023 Aug. 4.0 TT = JDT 2460160.5 T 2023 July 31.42913 TT Sato q 1.4833702 (2000.0) P Q z -0.0000411 Peri. 329.80757 +0.28287198 -0.90352462 +/-0.0002979 Node 257.88410 -0.80093456 -0.40716258 e 1.0000610 Incl. 160.77705 -0.52771894 +0.13364839 From 66 observations 2021 Aug. 7-Oct. 28, mean residual 0".43. --