Nakano Note (Nakano wa Kangaeru noda) NK 4034 P/2018 A5 (PANSTARRS)
The following improved orbital elements, by S. Nakano, are from 36 observations 2016 Dec. 23 to 2018 Jan. 20. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.25 arc second. Orbit accuracy depends on one night observations on 2016 Dec. 23. Epoch = 2017 Sept. 4.0 TT T = 2017 Sept.23.82697 +/- 0.00090 (m.e.) TT Peri. = 359.68067 +/- 0.00025 Node = 87.82944 +/- 0.00005 (2000.0) Inc. = 23.57630 +/- 0.00005 q = 2.6938241 +/- 0.0000022 AU e = 0.5231593 +/- 0.0000040 a = 5.6493162 +/- 0.0000471 AU n' = 0.07340240 +/- 0.00000092 P = 13.427 +/- 0.0001679 years (+/- 0.06 day) The predicted orbit for the 2031 return is as follows: T = 2031 Feb. 2.71963 TT Epoch = 2031 Jan. 14.0 TT Peri. = 359.53566 e = 0.5235357 Node = 87.71290 (2000.0) a = 5.6289796 AU Inc. = 23.60737 n'= 0.07380054 q = 2.6820078 AU P = 13.355 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2016/ 171224 F51 0.1+ 0.2- 180115 568 0.0 0.1+ 161223 W84 0.1+ 0.1+ 171224 F51 0.0 0.0 180115 568 0.0 0.1+ 161223 W84 0.1- 0.2- 171224 F51 0.0 0.0 180115 568 0.0 0.1+ 2017/ 2018/ 180117 033 0.1- 0.0 171121 F51 0.1+ 0.1- 180113 F51 0.1+ 0.1- 180117 033 0.0 0.1+ 171121 F51 0.3- 0.0 180113 F51 0.1+ 0.1+ 180117 033 0.1- 0.1- 171121 F51 0.1+ 0.0 180113 F51 0.1+ 0.1- 180117 033 0.2- 0.0 171121 F51 0.1+ 0.1+ 180113 F51 0.0 0.1- 180117 033 0.2- 0.1- 171213 F51 0.0 0.2+ 180115 711 0.1+ 0.3+ 180117 033 0.0 0.1- 171213 F51 0.0 0.0 180115 711 0.2+ 0.3+ 180120 F51 0.1- 0.0 171213 F51 0.0 0.0 180115 711 0.1+ 0.4+ 180120 F51 0.0 0.0 171213 F51 0.2- 0.0 180115 H06 1.2- 0.1- 180120 F51 0.0 0.1- 171224 F51 0.1+ 0.1- 180115 H06 1.4- 0.1+ 180120 F51 0.0 0.0 ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2020 Feb. 7