Nakano Note (Nakano wa Kangaeru noda) NK 4499 P/PANSTARRS (2019 A7 = 2021 K4)
The following improved orbital elements, by S. Nakano, are from 98 observations 2017 to 2021. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.37 arc second. Residuals on recovery observations were +3" mainly for Right Ascension from the prediction in NK 3846 (= HICQ 2020 and HICQ 2021). No required the Delta-T correction. Epoch = 2023 Sept.13.0 TT T = 2023 Sept.12.15705 +/- 0.00575 (m.e.) TT Peri. = 118.77163 +/- 0.00057 Node = 280.42870 +/- 0.00002 (2000.0) Inc. = 17.76736 +/- 0.00001 q = 2.6737822 +/- 0.0000027 AU e = 0.1619652 +/- 0.0000001 a = 3.1905383 +/- 0.0000032 AU n' = 0.17294505 +/- 0.00000026 P = 5.699 +/- 0.0000085 years T = 2018 Jan. 8.33743 TT Epoch = 2018 Jan. 2.0 TT Peri. = 119.61009 e = 0.1607655 Node = 280.52536 (2000.0) a = 3.1886606 AU Inc. = 17.77072 n'= 0.17309783 q = 2.6760339 AU P = 5.694 years The predicted orbit for the 2029 return is as follows: T = 2029 May 17.82957 TT Epoch = 2029 May 24.0 TT Peri. = 118.13397 e = 0.1602554 Node = 280.38533 (2000.0) a = 3.1888823 AU Inc. = 17.77772 n'= 0.17307978 q = 2.6778466 AU P = 5.695 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2017/ 2019/ 190114 L01 0.6+ 0.6- 171001 G96 0.0 0.2- 190108 F51 0.1- 0.1+ 190115 691 0.1- 0.6+ 171001 G96 0.2+ 0.2+ 190108 F51 0.0 0.1- 190115 691 0.3+ 0.0 171001 G96 0.2+ 0.4+ 190108 F51 0.0 0.0 190115 691 0.2- 0.3+ 171001 G96 0.2- 0.0 190108 F51 0.0 0.0 190117 691 0.1- 0.5+ 171003 F51 0.1+ 0.1- 190109 568 0.0 0.1- 190117 691 0.3+ 0.7+ 171003 F51 0.0 0.0 190109 568 0.1+ 0.0 190117 691 0.1+ 0.2+ 171003 F51 0.0 0.1+ 190109 568 0.0 0.0 190117 I52 0.2- 0.6+ 171003 F51 0.0 0.1+ 190110 K41 1.3- 1.5+ 190117 I52 0.2- 0.2+ 171012 G96 0.1- 0.3+ 190110 K41 1.7- 0.6+ 190117 I52 0.5+ 0.0 171012 G96 0.1+ 0.3+ 190110 K41 0.6- 1.1- 190117 I52 0.1+ 0.4+ 171012 G96 0.0 0.2- 190111 G40 0.8+ 0.1- 190127 G96 0.2+ 0.1+ 171012 G96 0.2+ 0.4- 190111 G40 0.8- 0.2- 190127 G96 0.1+ 0.0 171027 F51 0.1+ 0.1- 190111 106 0.2- 0.8+ 190127 G96 0.2- 0.5+ 171027 F51 0.1+ 0.0 190111 106 0.8+ 1.4- 190127 G96 0.2+ 0.2+ 171027 F51 0.0 0.0 190111 I52 1.1- 0.2+ 190204 A71 0.7- 0.3+ 171027 F51 0.1+ 0.0 190111 I52 0.6+ 0.1- 190204 A71 0.1- 0.7+ 171028 G96 0.5- 0.5+ 190111 I52 0.7- 0.5+ 190205 461 0.3+ 0.1+ 171028 G96 0.6+ 0.3- 190111 I52 0.1- 0.1- 190205 461 0.2+ 0.1- 171028 G96 0.0 0.4+ 190112 L27 0.4- 0.4+ 190205 461 0.6+ 0.3+ 171028 G96 0.3+ 0.7+ 190112 L27 0.5- 0.0 190211 G96 0.9+ 0.2+ 171109 F51 0.3+ 0.1+ 190112 L27 1.1- 0.1+ 190211 G96 0.8+ 0.4+ 171109 F51 0.0 0.1- 190112 691 0.4- 0.4+ 190211 G96 0.4+ 0.2+ 171109 F51 0.1- 0.0 190112 691 0.1- 0.3+ 190211 G96 1.0+ 0.8+ 171109 F51 0.2- 0.1+ 190112 691 0.6- 0.3+ 190301 304 0.1+ 0.1- 171121 F51 0.1- 0.1- 190112 I52 0.7- 0.2+ 190301 304 0.0 0.1- 171121 F51 0.2- 0.1- 190112 I52 0.2+ 0.5+ 190301 304 0.1+ 0.1- 171121 F51 0.3- 0.1+ 190112 I52 0.8- 0.6+ 2021/ 171121 F51 0.1- 0.1+ 190112 Q62 0.1- 0.4+ 210517 I11 0.2- 0.1+ 2018/ 190112 Q62 0.0 0.4+ 210517 I11 0.1+ 0.1+ 181216 F51 0.0 0.4- 190112 Q62 0.0 0.2- 210517 I11 0.0 0.1+ 181216 F51 0.1+ 0.0 190113 Q62 0.2- 0.7+ 210613 568 0.0 0.0 181216 F51 0.1- 0.1- 190113 Q62 0.4- 0.8+ 210613 568 0.0 0.0 181216 F51 0.2+ 0.0 190114 L01 0.3+ 1.0- 210613 568 0.0 0.0 ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 Aug. 8