Nakano Note (Nakano wa Kangaeru noda) NK 4871 P/2021 L4 (PANSTARRS)
The following improved orbital elements, by S. Nakano, are from 44 observations 2021 June 2 to 2022 Sept. 17. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.20 arc second. See an orbit in CBET 4986. Epoch = 2019 Aug. 25.0 TT T = 2019 Sept. 5.67082 +/- 0.00705 (m.e.) TT Peri. = 234.92067 +/- 0.00105 Node = 243.23503 +/- 0.00003 (2000.0) Inc. = 16.95981 +/- 0.00001 q = 2.7899344 +/- 0.0000080 AU e = 0.1191413 +/- 0.0000015 a = 3.1672892 +/- 0.0000106 AU n' = 0.17485276 +/- 0.00000088 P = 5.637 +/- 0.0000283 years The predicted orbit for the 2025 return is as follows: T = 2025 Apr. 15.02266 TT Epoch = 2025 May 5.0 TT Peri. = 233.02185 e = 0.1160796 Node = 243.14769 (2000.0) a = 3.1702454 AU Inc. = 16.96570 n'= 0.17460824 q = 2.8022445 AU P = 5.645 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2021/ 210616 Y00 1.0+ 0.4- 210902 309 0.2- 0.3+ 210602 691 0.5+ 0.3- 210616 Y00 0.5+ 0.5- 210902 309 0.2+ 0.2+ 210602 691 0.2- 0.6- 210616 Y00 0.2+ 0.3- 210902 309 0.0 0.1+ 210602 691 0.4- 0.2- 210626 Z23 0.4- 0.2+ 2022/ 210609 F51 0.1- 0.4+ 210626 Z23 0.3+ 0.0 220525 568 0.1- 0.1- 210609 F51 0.1+ 0.1+ 210627 Z23 0.2- 0.1+ 220525 568 0.0 0.0 210609 F51 0.3+ 0.0 210627 Z23 0.2+ 0.0 220720 568 0.0 0.0 210609 F51 0.2+ 0.2+ 210708 309 0.1- 0.0 220720 568 0.0 0.0 210614 F51 0.1+ 0.2+ 210708 309 0.3- 0.0 220720 568 0.0 0.1- 210614 F51 0.1- 0.2+ 210712 309 0.1- 0.3+ 220823 568 0.0 0.1- 210614 F51 0.2+ 0.2+ 210712 309 0.1- 0.2+ 220823 568 0.1+ 0.0 210614 568 0.2- 0.2+ 210726 250 0.2- 0.2+ 220917 568 0.0 0.1+ 210614 568 0.2- 0.1+ 210726 250 0.2- 0.2+ 220917 568 0.0 0.0 210614 568 0.2- 0.1+ 210726 250 0.1- 0.2+ 220917 568 0.0 0.0 210615 Q62 0.2- 0.7- 210726 250 0.2- 0.2+ 210615 Q62 0.4- 0.4- 210726 250 0.3- 0.1+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2022 Dec. 11