Nakano Note (Nakano wa Kangaeru noda) NK 5044 P/2020 B4 (Sheppard)
The following improved orbital elements, by S. Nakano, are from 20 observations 2018 Jan. 15 to 2022 Apr. 9. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.23 arc second. The 2018 and 2022 observations were reported on 2023 July MPCs. See the previous orbit in CBET 5102 (= NK 4646). Epoch = 2021 Dec. 12.0 TT T = 2021 Nov. 22.80968 +/- 0.02407 (m.e.) TT Peri. = 342.30580 +/- 0.00158 Node = 185.98067 +/- 0.00013 (2000.0) Inc. = 11.60735 +/- 0.00002 q = 6.4399351 +/- 0.0000222 AU e = 0.1917623 +/- 0.0000072 a = 7.9678726 +/- 0.0000760 AU n' = 0.04382183 +/- 0.00000063 P = 22.491 +/- 0.0003216 years (+/- 0.12 day) The predicted orbit for the 2044 return is as follows: T = 2044 June 27.46462 TT Epoch = 2044 July 4.0 TT Peri. = 342.97850 e = 0.1913286 Node = 185.94207 (2000.0) a = 7.9572433 AU Inc. = 11.61229 n'= 0.04390966 q = 6.4347954 AU P = 22.446 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2018/ 200127 807 0.1+ 0.1+ 210207 F51 0.2- 0.2+ 180115 T09 0.1- 0.1+ 200204 F52 0.4+ 0.5+ 210207 F51 0.2- 0.3+ 180116 T09 0.0 0.1- 200211 W84 0.2+ 0.1- 210207 F51 0.2- 0.2+ 2019/ 200211 W84 0.2+ 0.3- 2022/ 191105 F52 0.1+ 0.5- 200323 F51 0.1- 0.0 220408 304 0.1+ 0.1- 191125 F52 0.0 0.0 200512 F52 0.4+ 0.6- 220409 304 0.0 0.0 191129 F52 0.4- 0.4+ 2021/ 220409 304 0.1+ 0.2- 2020/ 210207 F51 0.0 0.1+ 200126 807 0.3- 0.0 210207 F51 0.1- 0.2- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2023 Aug. 1