Nakano Note (Nakano wa Kangaeru noda) NK 3593 P/2017 X1 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 63 observations 2017 Dec. 12 to 2018 Apr. 13. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.32 arc second. Epoch = 2018 June 11.0 TT T = 2018 June 14.55765 +/- 0.04640 (m.e.) TT Peri. = 283.12252 +/- 0.00685 Node = 251.12561 +/- 0.00060 (2000.0) Inc. = 31.31079 +/- 0.00006 q = 4.6624348 +/- 0.0000891 AU e = 0.8511062 +/- 0.0000190 a = 31.3138345 +/- 0.0040489 AU n' = 0.00562470 +/- 0.00000109 P = 175.228 +/- 0.0339859 years (+/-12.4 days) The predicted orbit for the 2191 return is as follows: T = 2191 May 11.16050 TT Epoch = 2191 May 15.0 TT Peri. = 283.09759 e = 0.8522381 Node = 251.00904 (2000.0) a = 31.5505462 AU Inc. = 31.30353 n'= 0.00556152 q = 4.6619696 AU P = 177.219 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2017/ 171215 691 0.1+ 0.1+ 180103 F51 0.1+ 0.3- 171212 F51 0.2+ 0.1+ 171215 691 0.1+ 0.0 180103 F51 0.2- 0.1+ 171212 F51 0.2- 0.0 171215 691 0.4+ 0.4- 180114 Q62 0.1- 0.0 171212 F51 0.0 0.0 171215 I52 0.5- 0.7- 180114 Q62 0.1+ 0.0 171212 F51 0.2- 0.0 171215 I52 0.4- 0.5- 180114 Q62 0.3+ 0.2+ 171213 568 0.1+ 0.1- 171215 I52 0.2- 1.2- 180211 474 0.0 0.1+ 171213 568 0.1+ 0.1- 171216 I52 0.4- 0.4+ 180211 474 0.2- 0.0 171213 568 0.1+ 0.1- 171216 I52 0.2+ 0.4+ 180211 474 0.1- 0.1+ 171214 I52 0.0 0.2+ 171216 I52 0.8+ 0.3+ 180211 474 0.0 0.0 171214 I52 0.4- 0.1+ 171216 691 0.6+ 0.5+ 180213 474 0.0 0.0 171214 I52 0.1+ 0.1+ 171216 691 0.4+ 0.5+ 180213 474 0.2- 0.1+ 171214 I52 0.2- 0.1+ 171216 691 0.1- 0.4+ 180213 474 0.1- 0.1+ 171214 Q62 0.3- 0.0 171219 691 0.2+ 0.2+ 180310 474 0.0 0.2- 171214 Q62 0.4- 0.2+ 171219 691 0.4- 0.3+ 180310 474 0.1- 0.1- 171214 Q62 0.4- 0.2+ 171219 691 0.1- 0.2+ 180310 474 0.1+ 0.2- 171215 807 0.2- 0.2- 2018/ 180406 215 0.2+ 0.5- 171215 807 0.1- 0.0 180103 F51 0.1- 0.1+ 180406 215 0.3- 0.6+ 171215 807 0.1- 0.0 180103 F51 0.0 0.1+ 180406 215 0.1- 1.8+ 171215 W87 0.0 0.1- 180103 F51 0.1- 0.1+ 180413 474 0.1- 0.6- 171215 W87 0.0 0.2- 180103 F51 0.2+ 0.2- 180413 474 0.1- 0.6- 171215 W87 0.0 0.2- 180103 F51 0.0 0.2- 180413 474 0.2+ 0.5- 171215 W87 0.1+ 0.2- 180103 F51 0.1+ 0.3+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2018 May 17

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