Nakano Note (Nakano wa Kangaeru noda) NK 3977 348P/PANSTARRS

The following improved orbital elements, by S. Nakano, are from 40 observations 2009 to 2017. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.46 arc second. See the previous orbit in NK 3278. Epoch = 2016 June 21.0 TT T = 2016 June 22.14211 +/- 0.00164 (m.e.) TT Peri. = 133.75378 +/- 0.00029 Node = 313.74709 +/- 0.00003 (2000.0) Inc. = 17.58455 +/- 0.00002 q = 2.2121218 +/- 0.0000031 AU e = 0.3009911 +/- 0.0000011 a = 3.1646546 +/- 0.0000068 AU n' = 0.17507115 +/- 0.00000056 P = 5.630 +/- 0.0000181 years T = 2010 Nov. 1.75139 TT Epoch = 2010 Nov. 20.0 TT Peri. = 133.44339 e = 0.3010516 Node = 313.80777 (2000.0) a = 3.1638433 AU Inc. = 17.58406 n'= 0.17513850 q = 2.2113633 AU P = 5.628 years The predicted orbit for the 2022 return is as follows: T = 2022 Feb. 12.52062 TT Epoch = 2022 Mar. 2.0 TT Peri. = 135.66222 e = 0.3068123 Node = 312.94173 (2000.0) a = 3.1504668 AU Inc. = 17.74020 n'= 0.17625511 q = 2.1838650 AU P = 5.592 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2009/ 161204 G96 0.5- 0.1+ 170105 C10 1.6- 1.6+ 090918 568 0.2- 0.1+ 161204 G96 0.5- 0.3+ 170105 C10 (2.1- 1.7+) 090918 568 0.1- 0.1+ 161204 G96 0.2- 0.9- 170105 Q62 0.1+ 0.2- 090918 568 0.0 0.1+ 161224 G96 0.7- 0.4+ 170105 Q62 0.3+ 0.1- 090918 568 0.2- 0.1+ 161224 G96 1.2- 0.1+ 170106 Q21 1.2+ 0.4- 090918 568 0.0 0.1+ 2017/ 170106 Q21 (2.0- 1.3+) 2011/ 170102 F51 0.1+ 0.2+ 170125 G40 1.5- 1.4+ 110113 G96 0.3- 0.3- 170102 F51 0.2+ 0.1- 170125 G40 1.9- 0.9+ 110113 G96 0.3- 0.4- 170102 F51 0.2+ 0.0 170126 F51 0.3+ 0.0 110113 G96 0.3- 0.2- 170102 F51 0.1+ 0.0 170126 F51 0.2+ 0.1+ 110113 G96 0.0 0.1- 170103 568 0.2+ 0.1- 170126 F51 0.1- 0.1+ 110130 F51 0.0 0.1+ 170103 568 0.2+ 0.1- 170127 215 (2.8- 0.8+) 110130 F51 0.1+ 0.0 170103 568 0.2+ 0.1- 170127 215 (2.5- 0.5+) 110130 F51 0.0 0.0 170104 W96 1.5- 0.6+ 170127 215 (2.4- 0.3+) 110130 F51 0.0 0.0 170104 W96 1.7- 0.8+ 170324 695 0.1+ 0.3- 2016/ 170104 W96 (2.3- 1.4+) 170324 695 0.4+ 0.1+ 161204 G96 0.7- 0.5+ 170105 C10 1.5- 0.7+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2019 Dec. 13

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