Nakano Note (Nakano wa Kangaeru noda) NK 3840 P/2017 X1 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 81 observations 2017 Dec. 12 to 2019 Apr. 2. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.29 arc second. See the previous orbits in NK 3593, NK 3694 (= HICQ 2019) and NK 3785. Epoch = 2018 June 11.0 TT T = 2018 June 14.52855 +/- 0.00446 (m.e.) TT Peri. = 283.11700 +/- 0.00058 Node = 251.12710 +/- 0.00007 (2000.0) Inc. = 31.31095 +/- 0.00001 q = 4.6625578 +/- 0.0000104 AU e = 0.8511198 +/- 0.0000086 a = 31.3175038 +/- 0.0018040 AU n' = 0.00562372 +/- 0.00000049 P = 175.259 +/- 0.0151455 years (+/- 5.53 days) The predicted orbit for the 2191 return is as follows: T = 2191 May 21.85782 TT Epoch = 2191 May 15.0 TT Peri. = 283.09174 e = 0.8522355 Node = 251.01083 (2000.0) a = 31.5510904 AU Inc. = 31.30350 n'= 0.00556138 q = 4.6621313 AU P = 177.224 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2017/ 171216 I52 0.2+ 0.4+ 180310 474 0.0 0.1- 171212 F51 0.1+ 0.1+ 171216 I52 0.8+ 0.4+ 180406 215 0.1+ 0.0 171212 F51 0.2- 0.1+ 171216 691 0.6+ 0.5+ 180406 215 0.4- 1.1+ 171212 F51 0.0 0.0 171216 691 0.3+ 0.5+ 180406 215 (0.2- 2.3+) 171212 F51 0.2- 0.1+ 171216 691 0.2- 0.4+ 180413 474 0.2- 0.1- 171213 568 0.0 0.1- 171219 691 0.2+ 0.2+ 180413 474 0.2- 0.0 171213 568 0.0 0.1- 171219 691 0.4- 0.3+ 180413 474 0.1+ 0.0 171213 568 0.0 0.1- 171219 691 0.1- 0.2+ 180607 474 0.1+ 0.2- 171214 I52 0.0 0.2+ 2018/ 180607 474 0.0 0.2- 171214 I52 0.4- 0.1+ 180103 F51 0.0 0.1+ 180607 474 0.1+ 0.1- 171214 I52 0.0 0.1+ 180103 F51 0.1+ 0.1+ 180607 474 0.3- 0.2- 171214 I52 0.2- 0.2+ 180103 F51 0.0 0.1+ 180717 474 0.1- 0.1- 171214 Q62 0.3- 0.1+ 180103 F51 0.3+ 0.2- 180717 474 0.1- 0.1- 171214 Q62 0.4- 0.2+ 180103 F51 0.1+ 0.2- 180717 474 0.4- 0.3- 171214 Q62 0.4- 0.2+ 180103 F51 0.1+ 0.3+ 180717 474 0.1- 0.3- 171215 807 0.2- 0.2- 180103 F51 0.1+ 0.3- 2019/ 171215 807 0.1- 0.0 180103 F51 0.1- 0.1+ 190203 474 0.4- 0.4- 171215 807 0.1- 0.0 180114 Q62 0.0 0.0 190203 474 0.2- 0.7- 171215 W87 0.0 0.1- 180114 Q62 0.2+ 0.0 190203 474 0.4+ 0.7- 171215 W87 0.1- 0.2- 180114 Q62 0.4+ 0.1+ 190203 474 0.2+ 0.8- 171215 W87 0.0 0.2- 180211 474 0.0 0.0 190215 Q62 0.1+ 0.8+ 171215 W87 0.1+ 0.1- 180211 474 0.2- 0.1- 190215 Q62 0.0 0.5+ 171215 691 0.1+ 0.1+ 180211 474 0.1- 0.1+ 190215 Q62 0.3- 0.3+ 171215 691 0.1+ 0.1+ 180211 474 0.0 0.0 190402 474 0.2+ 0.2+ 171215 691 0.3+ 0.4- 180213 474 0.0 0.0 190402 474 0.2+ 0.7+ 171215 I52 0.6- 0.7- 180213 474 0.2- 0.1+ 190402 474 0.1- 0.3+ 171215 I52 0.4- 0.5- 180213 474 0.1- 0.1+ 190402 474 0.0 0.1+ 171215 I52 0.2- 1.2- 180310 474 0.1- 0.0 171216 I52 0.5- 0.4+ 180310 474 0.2- 0.1+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2019 June 10

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