Nakano Note (Nakano wa Kangaeru noda) NK 4390 C/2020 U4 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 122 observations 2019 Nov. 9 to 2021 Jan. 3. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.35 arc second. The comet will pass 1.57 AU from Jupiter on 2023 Feb. 10 and 2.40 AU from Saturn on 2024 July 25 UT. See the previous orbits in CBET 4880 (= NK 4232) and NK 4312. Epoch = 2022 Apr. 11.0 TT T = 2022 Apr. 7.99635 +/- 0.00163 (m.e.) TT Peri. = 69.53529 +/- 0.00027 Node = 120.01375 +/- 0.00004 (2000.0) Inc. = 167.03591 +/- 0.00004 q = 5.3536608 +/- 0.0000203 AU e = 1.0013299 +/- 0.0000098 1/a = -0.0002484 +/- 0.0000018 1/AU origin = +0.000017 (Q= 8) future = -0.000119 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2019/ 201024 H06 0.1+ 0.1- 201122 G96 0.3+ 0.1- 191109 F52 0.1- 0.2- 201024 H06 0.3+ 0.0 201122 G96 0.0 0.1- 191128 F52 0.2- 0.2+ 201027 G96 0.2+ 0.1+ 201122 G96 0.1+ 0.0 191128 F52 0.1- 0.0 201027 G96 0.3+ 0.1- 201122 G96 0.1+ 0.1- 191128 F52 0.0 0.1- 201027 G96 0.2+ 0.2- 201127 F52 0.2- 0.0 191128 F52 0.1+ 0.1- 201027 G96 0.0 0.0 201127 F52 0.1+ 0.1+ 191220 F52 0.0 0.1+ 201028 L01 0.1- 0.3- 201127 F52 0.1- 0.2+ 191220 F52 0.2+ 0.2+ 201028 L01 0.0 0.2- 201127 F52 0.0 0.1- 2020/ 201028 L01 0.3+ 0.2- 201208 J43 0.2- 0.1- 200126 F51 0.1- 0.1- 201028 L01 0.1+ 0.1- 201208 J43 0.3- 0.3+ 200126 F51 0.1- 0.1- 201028 L01 0.1- 0.2+ 201208 J43 0.2- 0.1+ 200126 F51 0.1- 0.1- 201028 Z08 0.5+ 0.4- 201208 J43 0.4- 0.4- 200130 F51 0.2- 0.0 201028 Z08 0.1- 0.0 201208 703 0.7+ 1.5- 200130 F51 0.0 0.2- 201109 Q21 1.2+ 0.1- 201208 703 0.9+ 0.7- 200130 F51 0.8+ 0.5+ 201109 Q21 0.9+ 0.1+ 201208 703 0.5+ 0.4+ 200130 F51 0.1- 0.1- 201109 D29 0.6+ 0.1+ 201209 V00 0.2+ 0.1- 200419 F52 0.1- 0.1- 201109 D29 0.6+ 0.4- 201209 V00 0.3+ 0.1+ 200419 F52 0.2- 0.1- 201109 D29 0.3- 0.1- 201209 V00 0.2+ 0.2- 200927 F51 0.1- 0.0 201110 F52 0.0 0.0 201209 V00 0.1+ 0.0 200927 F51 0.1- 0.0 201110 F52 0.2+ 0.1+ 201212 T05 0.0 0.1- 200927 F51 0.2- 0.0 201110 F52 0.2+ 0.0 201212 T05 0.8+ 0.0 200927 F51 0.1- 0.1+ 201110 F52 0.1- 0.1- 201212 T05 0.4+ 0.2- 201003 F51 0.1- 0.1+ 201112 G96 0.6+ 0.1+ 201212 T05 0.2+ 0.4+ 201003 F51 0.1- 0.1+ 201112 G96 0.3+ 0.0 201214 703 0.6- 0.5- 201003 F51 0.1+ 0.0 201112 G96 0.3+ 0.1- 201214 703 0.1- 0.3- 201003 F51 0.0 0.0 201112 G96 0.1+ 0.1- 201214 703 0.5- 0.3+ 201005 F52 0.2+ 0.3- 201115 215 0.9+ 0.5+ 201214 703 0.1+ 0.6- 201013 G96 0.1+ 0.1- 201115 215 0.5+ 0.1- 201216 G96 0.3+ 0.1- 201013 G96 0.2- 0.1- 201115 215 0.4+ 0.4- 201216 G96 0.2+ 0.1- 201013 G96 0.2+ 0.1+ 201118 703 (3.2+ 1.1-) 201216 G96 0.0 0.1+ 201013 G96 0.1+ 0.2+ 201118 703 0.1- 1.1- 201216 G96 0.5+ 0.0 201017 F52 0.0 0.2+ 201118 703 1.6- 0.5- 201222 568 0.4- 0.2+ 201022 F51 0.0 0.1+ 201118 703 0.4- 0.1- 201222 568 0.4- 0.2+ 201022 F51 0.0 0.1+ 201119 I81 0.1- 0.5- 201226 T08 1.1+ 0.9- 201022 F51 0.0 0.1+ 201119 I81 0.0 0.1- 201226 T08 0.6+ 0.2- 201022 F51 0.1- 0.0 201119 I81 0.0 0.0 201226 T08 0.2- 0.5- 201023 F51 0.1- 0.0 201121 I81 0.8+ 0.5- 201226 T08 0.4- 0.1+ 201023 F51 0.0 0.0 201121 I81 0.1- 0.0 2021/ 201023 F51 0.0 0.0 201121 I81 0.4+ 0.4- 210103 T08 0.2+ 0.4- 201023 N51 0.4- 0.1+ 201122 941 0.1+ 0.1- 210103 T08 0.3+ 0.3- 201023 N51 0.4- 0.1+ 201122 941 0.1+ 0.0 210103 T08 1.6+ 0.2- 201023 N51 0.2- 0.0 201122 941 0.3+ 0.0 210103 T08 0.5+ 0.1- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 Jan. 29

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