Nakano Note (Nakano wa Kangaeru noda) NK 3678 P/2018 K1 (Weiland)

The following improved orbital elements, by S. Nakano, are from 107 observations 2017 Nov. 6 to 2018 July 13. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.52 arc second. The comet will pass 2.81 AU from Jupiter on 2018 Sept. 26 and 0.66 AU from Saturn on 2178 June 2 UT. See the previous orbit in NK 3610. Epoch = 2018 Mar. 23.0 TT T = 2018 Apr. 6.89479 +/- 0.00153 (m.e.) TT Peri. = 325.00131 +/- 0.00070 Node = 260.00191 +/- 0.00007 (2000.0) Inc. = 164.19265 +/- 0.00007 q = 1.8791609 +/- 0.0000072 AU e = 0.9371268 +/- 0.0000333 a = 29.8881239 +/- 0.0158946 AU n' = 0.00603193 +/- 0.00000478 P = 163.398 +/- 0.1305127 years (+/-47.7 days) The predicted orbit for the 2181 return is as follows: T = 2181 May 14.60007 TT Epoch = 2181 May 27.0 TT Peri. = 325.20275 e = 0.9404941 Node = 260.16826 (2000.0) a = 31.1231701 AU Inc. = 164.30607 n'= 0.00567647 q = 1.8520116 AU P = 173.630 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2017/ 180526 Q62 1.6- 0.0 180528 W96 1.3+ 0.2- 171106 F51 0.1- 0.0 180526 E23 0.8- 0.2+ 180528 W96 0.5- 1.2+ 171106 F51 0.0 0.0 180526 E23 0.1+ 1.2- 180528 W96 0.5+ 1.6+ 171106 F51 0.1+ 0.1- 180526 E23 0.2+ 0.5- 180528 W96 0.8- 0.0 2018/ 180526 Q62 0.4+ 0.5+ 180528 W96 0.5+ 0.1- 180524 F51 0.2+ 0.1+ 180526 Q62 0.0 0.3+ 180528 W96 1.2+ 0.1+ 180524 F51 0.2+ 0.2+ 180526 Q62 0.1+ 0.4+ 180528 Y00 0.3- 0.1- 180525 T08 0.3- 0.6- 180526 Q62 0.5- 0.0 180528 Y00 0.9- 0.1- 180525 T08 0.7- 1.0- 180526 Q62 0.3- 0.5+ 180528 Y00 0.3- 0.1- 180525 T08 0.6- 0.8- 180526 Q62 0.3- 0.3- 180528 Y00 0.2- 0.3- 180525 T08 0.7- 0.4- 180526 349 0.3+ 0.6- 180528 Q62 0.2+ 0.2- 180525 T08 0.5- 0.2- 180526 349 0.4+ 0.6- 180528 Q62 0.3- 0.1- 180525 T08 0.3- 0.2- 180526 372 0.2+ 0.1+ 180528 Q62 0.0 0.3+ 180525 T08 0.7+ 0.3- 180526 372 0.2+ 0.1+ 180529 H47 1.0- 0.3- 180525 Q62 0.3+ 0.3+ 180526 Q62 0.5+ 0.3+ 180529 H47 0.2+ 0.0 180525 Q62 0.6+ 0.0 180526 Q62 0.6- 0.4+ 180530 Y00 0.3+ 0.0 180525 Q62 0.8+ 0.1+ 180526 Q62 0.2+ 0.2+ 180530 Y00 0.4- 1.1- 180525 Q62 0.2+ 0.1- 180526 Q62 0.4- 0.1+ 180530 691 0.0 0.2+ 180525 Q62 0.1+ 0.0 180526 Q62 0.3+ 0.2+ 180530 691 0.6- 0.0 180525 Q62 0.1+ 0.3+ 180526 Q62 0.8- 0.6- 180607 D95 (1.2+ 2.4+) 180526 I47 0.7- 0.4+ 180526 Q62 0.2+ 0.1+ 180607 D95 1.0+ 0.5+ 180526 I47 0.4- 0.4- 180526 Q62 0.6+ 0.1+ 180607 Q23 0.8+ 0.4+ 180526 W88 0.5+ 0.3+ 180526 Q62 0.3+ 0.4+ 180607 Q23 0.7+ 0.1+ 180526 W88 0.4- 0.6- 180527 Y00 0.1- 1.1- 180607 349 0.2+ 0.5- 180526 W88 0.8+ 0.2+ 180527 Y00 1.1- 1.1- 180607 349 0.1- 0.4- 180526 W88 0.0 0.4- 180527 W88 0.4- 0.6- 180607 349 0.6+ 0.0 180526 W88 0.1- 0.3- 180527 W88 0.5- 0.2- 180607 349 0.2+ 0.2+ 180526 Q62 1.7+ 0.4- 180527 H06 1.5+ 0.0 180612 372 0.7- 0.2+ 180526 Q62 0.2+ 0.5+ 180527 H06 0.1- 0.3+ 180612 372 0.5- 0.1- 180526 Q62 0.7+ 0.9+ 180527 I52 0.7+ 0.5+ 180612 Q11 0.6- 0.2+ 180526 Q62 1.6- 0.2+ 180527 I52 0.3+ 0.0 180612 Q11 0.4- 0.1+ 180526 Q62 1.3- 0.3+ 180527 I52 0.6+ 0.1+ 180612 Q11 0.3- 0.1+ 180526 Q62 0.1+ 0.1+ 180527 W88 0.2- 0.6- 180613 D81 0.6+ 1.2+ 180526 Q62 1.2- 0.6+ 180527 I52 0.3+ 0.1+ 180613 D81 1.0+ 0.9- 180526 Q62 0.7- 0.9- 180527 W88 0.0 0.6- 180713 Q11 0.4- 0.1+ 180526 E23 0.9- 1.6+ 180527 W88 0.4- 0.6- 180713 Q11 0.2- 0.3- 180526 E23 0.0 0.7- 180528 W96 0.8- 0.6+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2018 Aug. 12

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