Nakano Note (Nakano wa Kangaeru noda) NK 3846 P/2019 A7 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 89 observations 2017 Oct. 1 to 2019 Feb. 11. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.41 arc second. Epoch = 2018 Jan. 2.0 TT T = 2018 Jan. 8.33323 +/- 0.00422 (m.e.) TT Peri. = 119.60916 +/- 0.00094 Node = 280.52535 +/- 0.00003 (2000.0) Inc. = 17.77070 +/- 0.00002 q = 2.6760297 +/- 0.0000042 AU e = 0.1607673 +/- 0.0000029 a = 3.1886624 +/- 0.0000119 AU n' = 0.17309769 +/- 0.00000097 P = 5.694 +/- 0.0000319 years The predicted orbit for the 2023 return is as follows: T = 2023 Sept.12.15466 TT Epoch = 2023 Sept.13.0 TT Peri. = 118.77073 e = 0.1619670 Node = 280.42869 (2000.0) a = 3.1905400 AU Inc. = 17.76734 n'= 0.17294491 q = 2.6737777 AU P = 5.699 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2017/ 181216 F51 0.2+ 0.0 190112 Q62 0.1- 0.4+ 171001 G96 0.1+ 0.2- 181216 F51 0.1- 0.1- 190112 Q62 0.0 0.3+ 171001 G96 0.3+ 0.2+ 181216 F51 0.2+ 0.0 190112 Q62 0.0 0.2- 171001 G96 0.3+ 0.4+ 2019/ 190113 Q62 0.2- 0.6+ 171001 G96 0.1- 0.0 190108 F51 0.1- 0.0 190113 Q62 0.4- 0.7+ 171003 F51 0.2+ 0.2- 190108 F51 0.0 0.1- 190114 L01 0.3+ 1.0- 171003 F51 0.0 0.0 190108 F51 0.0 0.1- 190114 L01 0.6+ 0.6- 171003 F51 0.0 0.0 190108 F51 0.1+ 0.0 190115 691 0.1- 0.5+ 171003 F51 0.1+ 0.1+ 190109 568 0.1+ 0.1- 190115 691 0.3+ 0.0 171012 G96 0.1- 0.3+ 190109 568 0.1+ 0.1- 190115 691 0.2- 0.2+ 171012 G96 0.1+ 0.3+ 190109 568 0.1+ 0.1- 190117 691 0.1- 0.4+ 171012 G96 0.0 0.3- 190110 K41 1.3- 1.5+ 190117 691 0.3+ 0.6+ 171012 G96 0.2+ 0.4- 190110 K41 1.7- 0.5+ 190117 691 0.1+ 0.1+ 171027 F51 0.1+ 0.1- 190110 K41 0.5- 1.2- 190117 I52 0.2- 0.5+ 171027 F51 0.1+ 0.1- 190111 G40 0.8+ 0.2- 190117 I52 0.2- 0.2+ 171027 F51 0.0 0.0 190111 G40 0.8- 0.3- 190117 I52 0.6+ 0.1- 171027 F51 0.2+ 0.0 190111 106 0.2- 0.8+ 190117 I52 0.1+ 0.4+ 171028 G96 0.5- 0.5+ 190111 106 0.8+ 1.5- 190127 G96 0.2+ 0.1+ 171028 G96 0.6+ 0.3- 190111 I52 1.1- 0.2+ 190127 G96 0.1+ 0.1- 171028 G96 0.0 0.4+ 190111 I52 0.6+ 0.1- 190127 G96 0.2- 0.4+ 171028 G96 0.3+ 0.7+ 190111 I52 0.6- 0.5+ 190127 G96 0.2+ 0.1+ 171109 F51 0.3+ 0.1+ 190111 I52 0.1- 0.1- 190204 A71 0.7- 0.2+ 171109 F51 0.1- 0.1- 190112 L27 0.4- 0.4+ 190204 A71 0.1- 0.7+ 171109 F51 0.1- 0.0 190112 L27 0.5- 0.1- 190205 461 0.3+ 0.0 171109 F51 0.2- 0.0 190112 L27 1.1- 0.0 190205 461 0.2+ 0.2- 171121 F51 0.1- 0.1- 190112 691 0.4- 0.4+ 190205 461 0.5+ 0.2+ 171121 F51 0.3- 0.1- 190112 691 0.1- 0.2+ 190211 G96 0.9+ 0.1+ 171121 F51 0.3- 0.1+ 190112 691 0.6- 0.3+ 190211 G96 0.8+ 0.3+ 171121 F51 0.1- 0.1+ 190112 I52 0.7- 0.1+ 190211 G96 0.4+ 0.1+ 2018/ 190112 I52 0.2+ 0.5+ 190211 G96 1.0+ 0.7+ 181216 F51 0.0 0.4- 190112 I52 0.8- 0.5+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2019 June 10

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