Nakano Note (Nakano wa Kangaeru noda) NK 4210 P/2020 R5 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 53 observations 2019 May 30 to 2020 Sept. 17. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.19 arc second. See CBET 4851. Epoch = 2020 May 31.0 TT T = 2020 May 28.08565 +/- 0.00586 (m.e.) TT Peri. = 82.30122 +/- 0.00101 Node = 272.96888 +/- 0.00006 (2000.0) Inc. = 11.45440 +/- 0.00001 q = 3.4130461 +/- 0.0000049 AU e = 0.3144647 +/- 0.0000047 a = 4.9786586 +/- 0.0000347 AU n' = 0.08872286 +/- 0.00000093 P = 11.109 +/- 0.0001161 years (+/- 0.04 day) The predicted orbit for the 2031 return is as follows: T = 2031 July 22.62589 TT Epoch = 2031 Aug. 2.0 TT Peri. = 82.91082 e = 0.3144180 Node = 272.89600 (2000.0) a = 4.9913803 AU Inc. = 11.45431 n'= 0.08838388 q = 3.4220005 AU P = 11.151 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2019/ 190903 F51 0.0 0.2+ 200916 F52 0.2+ 0.1- 190530 F51 0.1+ 0.1- 2020/ 200916 F52 0.1+ 0.1+ 190530 F51 0.1+ 0.1- 200731 G96 0.7- 0.5- 200916 F52 0.0 0.2- 190630 F51 0.0 0.0 200731 G96 0.6- 0.4- 200916 F52 0.1+ 0.2+ 190630 F51 0.1+ 0.0 200731 G96 0.2- 0.2- 200916 F52 0.1+ 0.2+ 190630 F51 0.0 0.1- 200731 G96 0.0 0.2- 200916 F52 0.1- 0.0 190725 F51 0.0 0.1+ 200823 F51 0.1+ 0.0 200916 F52 0.0 0.2- 190725 F51 0.1- 0.1+ 200823 F51 0.1- 0.0 200916 F52 0.1+ 0.0 190725 F51 0.1+ 0.1- 200823 F51 0.0 0.1- 200916 F52 0.1+ 0.1+ 190725 F51 0.1- 0.1- 200823 F51 0.0 0.1+ 200916 F52 0.1- 0.1+ 190729 F52 0.3- 0.1+ 200903 F51 0.0 0.3- 200917 711 0.4- 0.3+ 190729 F52 0.1+ 0.1+ 200903 F51 0.3- 0.4- 200917 711 0.2- 0.1- 190729 F52 0.0 0.2- 200903 F51 0.0 0.1+ 200917 711 0.5- 0.3+ 190729 F52 0.1- 0.1- 200914 F52 0.1- 0.1- 200917 F51 0.1+ 0.1+ 190805 F51 0.1- 0.0 200914 F52 0.1- 0.0 200917 F51 0.1+ 0.1+ 190805 F51 0.1+ 0.1+ 200914 F52 0.2+ 0.1+ 200917 F51 0.1+ 0.1+ 190805 F51 0.2- 0.1- 200914 F52 0.0 0.2+ 200917 F51 0.1+ 0.2+ 190805 F51 0.2+ 0.2- 200916 F52 0.1- 0.2- 190903 F51 0.1+ 0.5+ 200916 F52 0.2- 0.0 ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2020 Sept. 19

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