Nakano Note (Nakano wa Kangaeru noda) NK 4522 P/2021 R1 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 70 observations 2020 Aug. 10 to 2021 Sept. 5. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.26 arc second. The comet has passed 0.99 AU from Saturn on 1976 Oct. and 1.81 AU from Jupiter on 2020 Oct. 25 UT. See an orbit in CBET 5030 (same orbit). Epoch = 2021 Dec. 12.0 TT T = 2021 Dec. 17.58978 +/- 0.02705 (m.e.) TT Peri. = 220.31497 +/- 0.00310 Node = 143.40871 +/- 0.00006 (2000.0) Inc. = 5.52130 +/- 0.00001 q = 4.8855916 +/- 0.0000508 AU e = 0.4200264 +/- 0.0000101 a = 8.4238179 +/- 0.0001714 AU n' = 0.04031258 +/- 0.00000123 P = 24.449 +/- 0.0007460 years (+/- 0.27 day) The predicted orbit for the 2045 return is as follows: T = 2045 June 1.21826 TT Epoch = 2045 May 20.0 TT Peri. = 220.48450 e = 0.4013826 Node = 142.86102 (2000.0) a = 8.1382273 AU Inc. = 5.57100 n'= 0.04245309 q = 4.8716846 AU P = 23.216 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 210720 F51 0.2- 0.0 210818 F51 0.1- 0.0 200810 F51 0.0 0.2+ 210720 F51 0.1- 0.1- 210818 F51 0.1+ 0.1+ 200810 F51 0.0 0.2+ 210731 F51 0.1+ 0.1- 210827 F51 0.0 0.1+ 200811 F51 0.0 0.0 210731 F51 0.1- 0.0 210827 F51 0.0 0.2+ 200811 F51 0.4+ 0.0 210731 F51 0.1+ 0.2+ 210827 F51 0.2+ 0.1+ 200811 F51 0.2+ 0.0 210731 F51 0.0 0.0 210827 F51 0.0 0.0 200811 F51 0.5- 0.2- 210804 F51 0.1+ 0.0 210904 F51 0.1- 0.2+ 200817 F51 0.2+ 0.0 210804 F51 0.1+ 0.0 210904 F51 0.1- 0.0 200817 F51 0.1+ 0.3- 210804 F51 0.1+ 0.0 210904 F51 0.0 0.1+ 200817 F51 0.1- 0.1+ 210804 F51 0.1+ 0.0 210904 F51 0.1+ 0.1+ 200822 F51 0.1- 0.2- 210811 F51 0.0 0.1- 210904 F51 0.1+ 0.0 200822 F51 0.2- 0.5- 210811 F51 0.0 0.1+ 210904 F51 0.2+ 0.0 200907 F51 0.1+ 0.0 210811 F51 0.1+ 0.0 210904 A71 0.8- 0.5- 200907 F51 0.0 0.1+ 210811 F51 0.2+ 0.1+ 210904 A71 1.6- 0.1- 200912 F52 0.1- 0.0 210812 F51 0.1- 0.0 210905 L01 0.6- 0.7- 200912 F52 0.1- 0.4+ 210812 F51 0.1- 0.1- 210905 L01 0.6- 0.3+ 200912 F52 0.2- 0.0 210812 F51 0.1- 0.2- 210905 L01 0.3- 0.2- 200912 F52 0.3- 0.3+ 210812 F51 0.1+ 0.1- 210905 F51 0.0 0.0 200916 F51 0.0 0.1+ 210817 F51 0.1+ 0.2+ 210905 F51 0.0 0.0 200916 F51 0.3+ 0.0 210817 F51 0.1+ 0.1- 210905 F51 0.0 0.1+ 200916 F51 0.1+ 0.1- 210817 F51 0.0 0.0 210905 F51 0.1+ 0.0 2021/ 210817 F51 0.0 0.2- 210905 A71 1.0- 0.9- 210720 F51 0.0 0.0 210818 F51 0.2- 0.0 210905 A71 0.3- 0.4- 210720 F51 0.1+ 0.0 210818 F51 0.3- 0.2- 210905 A71 0.1- 0.1+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 Sept. 8

Back to Nakano Note Page