Nakano Note (Nakano wa Kangaeru noda) NK 4212 P/2020 S1 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 27 observations 2020 July 30 to Sept. 17. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.31 arc second. See CBET 4853. Epoch = 2021 Jan. 26.0 TT T = 2021 Jan. 17.01237 +/- 0.05095 (m.e.) TT Peri. = 254.89579 +/- 0.01297 Node = 129.45997 +/- 0.00137 (2000.0) Inc. = 13.73430 +/- 0.00043 q = 2.9471809 +/- 0.0001217 AU e = 0.5071968 +/- 0.0000434 a = 5.9804417 +/- 0.0005815 AU n' = 0.06739135 +/- 0.00000983 P = 14.625 +/- 0.0021332 years (+/- 0.78 day) The predicted orbit for the 2035 return is as follows: T = 2035 Sept.16.65807 TT Epoch = 2035 Sept.30.0 TT Peri. = 254.79544 e = 0.5092741 Node = 129.14452 (2000.0) a = 6.0493076 AU Inc. = 13.70580 n'= 0.06624385 q = 2.9685519 AU P = 14.878 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 200828 F52 0.2- 0.8- 200916 F51 0.1- 0.1- 200730 F52 0.3+ 0.2+ 200909 F51 0.1- 0.2+ 200916 F51 0.1+ 0.1- 200730 F52 0.2+ 0.2- 200909 F51 0.0 0.3- 200917 568 0.0 0.1- 200730 F52 0.5- 0.0 200909 F51 0.1+ 0.3+ 200917 568 0.0 0.1- 200822 F52 0.3- 0.0 200909 F51 0.0 0.1- 200917 F51 0.0 0.0 200822 F52 0.1- 0.0 200915 G96 0.4+ 0.4- 200917 F51 0.0 0.1+ 200822 F52 0.1+ 0.3+ 200915 G96 0.0 0.2+ 200917 F51 0.1+ 0.1+ 200822 F52 0.1+ 0.3+ 200915 G96 0.2- 1.7+ 200917 F51 0.2- 0.0 200828 F52 0.1+ 0.1+ 200916 F51 0.1+ 0.0 200828 F52 0.3+ 0.1+ 200916 F51 0.0 0.0 ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2020 Sept. 19

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