Nakano Note (Nakano wa Kangaeru noda) NK 4539 C/2020 X4 (Leonard)

The following improved orbital elements, by S. Nakano, are from 112 observations 2020 Dec. 14 to 2021 Sept. 13. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.50 arc second. See orbit in CBET 4909 (= HICQ 2021). Epoch = 2020 Nov. 7.0 TT T = 2020 Nov. 14.29915 +/- 0.01233 (m.e.) TT Peri. = 139.89113 +/- 0.00143 Node = 161.90859 +/- 0.00002 (2000.0) Inc. = 80.48643 +/- 0.00010 q = 5.2057512 +/- 0.0000280 AU e = 0.8791563 +/- 0.0000124 1/a = +0.0232135 +/- 0.0000024 1/AU a = 43.08 AU P = 282.7 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 201219 V06 0.5- 0.6+ 210103 I52 0.0 0.2- 201214 G96 0.4- 0.7+ 201220 H36 0.2+ 0.7+ 210103 I52 0.0 0.0 201214 G96 0.2- 0.2+ 201220 H36 0.1- 0.7+ 210105 H06 1.0- 0.9- 201214 G96 0.1+ 0.1+ 201220 H36 0.1- 0.4+ 210105 H06 1.3- 1.1- 201214 G96 0.5- 0.3+ 201220 I52 0.2- 0.2+ 210612 V00 0.2+ 0.2- 201214 I52 0.2- 0.2+ 201220 I52 0.2- 0.2+ 210612 V00 0.1- 0.2- 201214 I52 0.6- 0.1+ 201220 691 0.2+ 0.4+ 210612 V00 0.2- 0.3- 201214 I52 1.3+ 0.0 201220 I52 0.3- 0.7+ 210612 V00 0.5- 0.6- 201214 I52 0.4+ 0.8- 201220 I52 0.1+ 0.6- 210703 568 0.1+ 0.1- 201214 L06 0.2- 1.1- 201220 691 0.4- 0.8+ 210703 568 0.1+ 0.1- 201214 L06 0.3- 0.9- 201220 691 0.0 0.3+ 210803 F51 0.1+ 0.1+ 201214 L06 1.0- 1.2- 201221 I52 0.4- 0.2- 210803 F51 0.2+ 0.3- 201215 L01 0.1- 0.3+ 201221 I52 0.4+ 0.8- 210803 F51 0.2+ 0.1- 201215 L01 0.1- 0.2+ 201221 I52 0.3+ 0.9- 210803 F51 0.1+ 0.1- 201215 L01 0.1+ 0.3+ 201221 I52 1.3+ 0.4- 210805 F51 0.4- 0.1- 201215 L01 0.6+ 0.4+ 201222 I52 0.9+ 0.6- 210805 F51 0.5- 0.5+ 201215 B96 1.4+ 0.1- 201222 I52 0.1+ 0.2+ 210805 F51 0.0 0.1- 201215 B96 1.3+ 0.2- 201222 I52 0.3+ 0.5+ 210805 F51 0.1- 0.2+ 201216 I52 0.1- 0.6- 201222 I52 0.3+ 0.5+ 210805 568 0.0 0.1+ 201216 I52 0.4- 0.1- 201223 I52 0.1+ 0.4- 210805 568 0.0 0.1+ 201216 I52 0.1- 0.3+ 201223 I52 0.3+ 0.3+ 210808 W16 0.3+ 1.2+ 201216 I52 0.8- 0.7+ 201223 I52 0.5+ 0.1- 210808 W16 1.3+ 0.0 201217 H06 0.6- 0.3+ 201226 691 (2.4+ 1.4-) 210808 W16 0.0 0.1+ 201217 H06 0.6- 0.3+ 201226 691 0.4- 0.4+ 210808 W16 0.8- 0.7- 201217 I52 0.1- 0.3+ 201226 691 0.1+ 0.3- 210908 X03 0.5- 0.7+ 201217 I52 0.2- 0.8+ 201226 N51 0.9+ 1.1- 210908 X03 0.9- 0.6+ 201217 I52 0.6- 0.3+ 201226 N51 0.9+ 1.1- 210908 X03 0.6- 0.5+ 201217 F51 0.5- 0.2+ 201226 N51 0.9+ 1.2- 210909 F51 0.2- 0.0 201217 F51 0.0 0.1- 201226 N51 0.7+ 1.1- 210909 F51 0.1+ 0.1+ 201217 F51 0.1+ 0.0 201226 N51 0.7+ 1.2- 210909 F51 0.1+ 0.0 201217 587 0.7+ 0.6+ 201231 J95 1.2- 0.5- 210910 G96 0.2+ 0.2+ 201217 587 0.8+ 0.4+ 201231 J95 0.8- 0.5- 210910 G96 0.1- 0.1+ 201217 587 0.7+ 1.2+ 201231 J95 0.1- 0.3- 210910 G96 0.4+ 0.3- 201218 215 1.1- 1.7+ 2021/ 210913 F52 0.1- 0.0 201218 215 0.7- 0.9+ 210102 I52 0.8+ 0.9- 210913 F52 0.1+ 0.0 201218 215 0.5+ 0.4- 210102 I52 0.1- 0.2+ 210913 F52 0.3+ 0.1- 201219 V06 0.6- 0.8+ 210102 I52 0.2- 0.1+ 210913 F52 0.1- 0.3- 201219 V06 0.2- 0.0 210103 I52 0.8- 0.6+ 201219 V06 0.1+ 0.2+ 210103 I52 0.1+ 0.2+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 Sept. 26

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