Nakano Note (Nakano wa Kangaeru noda) NK 4389 P/2020 U2 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 105 observations 2020 Sept. 17 to 2021 Jan. 8. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.37 arc second. See an orbit in CBET 4878. Epoch = 2020 Dec. 17.0 TT T = 2020 Dec. 25.70173 +/- 0.00269 (m.e.) TT Peri. = 84.64580 +/- 0.00173 Node = 342.90121 +/- 0.00034 (2000.0) Inc. = 6.42109 +/- 0.00003 q = 1.8488700 +/- 0.0000094 AU e = 0.5104913 +/- 0.0000051 a = 3.7769910 +/- 0.0000437 AU n' = 0.13427191 +/- 0.00000233 P = 7.340 +/- 0.0001275 years (+/- 0.05 day) The predicted orbit for the 2028 return is as follows: T = 2028 May 2.26266 TT Epoch = 2028 Apr. 19.0 TT Peri. = 84.83777 e = 0.5107445 Node = 342.76327 (2000.0) a = 3.7763292 AU Inc. = 6.41927 n'= 0.13430720 q = 1.8475898 AU P = 7.338 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 201025 F51 0.0 0.0 201216 G96 0.2- 0.1+ 200917 F51 0.3+ 0.0 201025 F51 0.1- 0.0 201216 G96 0.1- 0.1+ 200917 F51 0.2+ 0.1+ 201026 N51 0.1+ 0.1- 201222 T08 0.4+ 0.3- 200917 F51 0.4+ 0.2+ 201026 N51 0.0 0.2- 201222 T08 0.4+ 0.4+ 200920 G96 0.1+ 1.2+ 201026 N51 0.0 0.1- 201222 T08 0.2+ 0.2- 200920 G96 0.9- 0.7+ 201026 N51 0.0 0.2- 201222 T08 0.2- 0.3- 200920 G96 0.7- 0.1- 201026 N51 0.1+ 0.2- 201224 658 0.1+ 0.2+ 200921 G96 0.1- 0.2+ 201026 N51 0.1+ 0.3- 201224 658 0.0 0.3+ 200921 G96 0.6+ 0.3+ 201109 215 0.4+ 0.3- 201224 658 0.2- 0.3+ 200921 G96 0.6- 0.3- 201109 215 0.4- 0.1- 201224 658 0.0 0.3+ 200921 F52 0.2+ 0.4+ 201109 215 0.5- 0.1+ 201224 658 0.1+ 0.3+ 201008 F52 0.3+ 0.1+ 201110 F52 0.2- 0.2- 201224 658 0.3+ 0.5+ 201013 G96 0.4+ 0.4+ 201110 F52 0.2- 0.0 201229 T05 1.0+ 0.2- 201013 G96 0.7- 0.0 201110 F52 0.1+ 0.0 201229 T05 0.2- 0.1- 201013 G96 0.6- 0.6- 201112 G96 0.2- 0.0 201229 T05 0.2+ 0.4+ 201013 G96 0.8- 0.7- 201112 G96 0.1+ 0.3- 201229 T05 0.0 0.7- 201017 F51 0.1- 0.0 201112 G96 0.2- 0.1- 2021/ 201017 F51 0.1- 0.1+ 201112 G96 0.8- 0.2+ 210102 703 1.5+ 0.2+ 201017 F51 0.4- 0.2- 201116 F51 0.1- 0.0 210102 703 1.1+ 0.3- 201017 F51 0.0 0.1+ 201116 F51 0.2- 0.0 210102 703 0.9+ 0.4+ 201019 F52 0.1+ 0.0 201116 F51 0.1- 0.2+ 210102 703 1.0+ 0.4+ 201019 F52 0.1+ 0.0 201116 F51 0.2- 0.1+ 210103 T08 0.0 0.0 201019 F52 0.1- 0.1- 201123 G96 0.4- 0.0 210103 T08 0.5+ 0.2+ 201019 F52 0.1+ 0.2- 201123 G96 0.1- 0.3- 210103 T08 0.6+ 0.0 201020 F51 0.1+ 0.1- 201123 G96 0.2+ 0.3- 210103 T08 0.6+ 0.2+ 201020 F51 0.1- 0.0 201123 G96 0.2- 0.3+ 210104 H06 0.3+ 0.2+ 201020 F51 0.0 0.3- 201212 T05 0.4- 0.4- 210104 H06 0.5+ 0.3+ 201020 F51 0.0 0.1- 201212 T05 0.0 0.6+ 210104 H06 0.8+ 0.0 201021 L01 0.1+ 0.3- 201212 T05 0.1- 0.1- 210104 H06 0.5+ 0.0 201021 L01 0.2+ 0.4+ 201212 T05 0.2+ 0.4- 210105 F52 0.0 0.0 201021 L01 0.0 0.4- 201214 T08 0.4- 0.3+ 210105 F52 0.1- 0.1+ 201022 H06 0.0 0.5- 201214 T08 0.3+ 0.4- 210105 F52 0.1- 0.0 201022 H06 0.1- 0.3+ 201214 T08 0.3+ 0.2- 210105 F52 0.2- 0.0 201023 F51 0.0 0.0 201214 T08 0.2+ 0.4- 210108 P87 1.6+ 0.4+ 201023 F51 0.1- 0.1+ 201216 G96 0.1- 0.0 210108 P87 0.8+ 0.4+ 201025 F51 0.1- 0.1- 201216 G96 0.2- 0.1+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 Jan. 29

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