Nakano Note (Nakano wa Kangaeru noda) NK 3643 142P/Ge-Wang

The following improved orbital elements, by T. Kobayashi, are from 72 observations 1988 to 2010, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 0.82 arc second. The comet will pass 0.99 AU and 0.71 AU from Jupiter on 2029 Sept. 30 and 2041 Sept. 8 UT, respectively. See the previous orbits in NK 533, NK 1151 and NK 1999. Epoch = 2010 June 13.0 TT T = 2010 May 30.48312 +/- 0.00717 (m.e.) TT Peri. = 175.73306 +/- 0.00216 Node = 176.51893 +/- 0.00060 (2000.0) Inc. = 12.30659 +/- 0.00019 q = 2.4881124 +/- 0.0000399 AU e = 0.5000131 +/- 0.0000068 a = 4.9763549 +/- 0.0001053 AU n' = 0.08878448 +/- 0.00000273 P = 11.101 +/- 0.0003548 years A1 = -2.720 +/- 2.204 A2 = -0.43425 +/- 0.02080 (+/- 0.13 day) T = 1988 May 23.96932 TT Epoch = 1988 June 8.0 TT Peri. = 176.16456 e = 0.5006395 Node = 180.53825 (2000.0) a = 5.0436180 AU Inc. = 11.66706 n'= 0.08701433 q = 2.5185835 AU P = 11.327 years T = 1999 June 21.46411 TT Epoch = 1999 July 1.0 TT Peri. = 177.38842 e = 0.5002217 Node = 177.14419 (2000.0) a = 4.9960095 AU Inc. = 12.17515 n'= 0.08826107 q = 2.4968970 AU P = 11.167 years The predicted orbit for the 2021 return is as follows: T = 2021 May 12.67393 TT Epoch = 2021 May 26.0 TT Peri. = 173.97062 e = 0.4976478 Node = 175.93317 (2000.0) a = 5.0027807 AU Inc. = 12.25078 n'= 0.08808194 q = 2.5131580 AU P = 11.190 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1988/ 991004 360 0.2+ 0.4+ 100725 C51 (1.2+ 3.1-) 881011 675 0.5- 0.2+ 991008 897 1.3- 1.8+ 100725 C51 1.6- 0.8- 881011 675 1.7+ 0.7- 991008 897 0.7- 1.2+ 100725 C51 0.5+ 0.8- 881103 897 (2.4- 1.0-) 991009 704 1.0+ 0.2- 100725 C51 (1.2- 2.1-) 881103 897 1.6- 0.9- 991009 704 0.1- 0.1- 100725 C51 0.5+ 0.4+ 881104 675 1.1+ 1.5- 991009 704 0.7- 0.5+ 100726 C51 1.5- 0.6+ 881104 327 0.2+ 0.5+ 991009 704 0.5+ 0.1+ 100726 C51 1.8+ 0.2+ 881104 327 1.6- 0.8- 991009 372 (0.8+ 5.3-) 100726 C51 1.2- 1.3- 881119 413 0.5+ 0.7+ 991013 118 0.5+ 0.4- 100822 A77 0.1+ 0.4+ 881128 372 0.2- 0.2+ 991013 118 0.1- 1.7- 100822 A77 0.8+ 0.9+ 881128 372 0.4+ 0.8+ 991013 118 0.5- 0.2- 100822 A77 1.3+ 0.5- 881130 372 0.1- 1.1+ 991013 118 1.1+ 0.6- 100918 C10 0.0 0.5+ 881207 801 0.4+ 0.7- 991013 118 0.2+ 1.2- 100918 C10 (3.6+ 1.6-) 881213 801 (3.6+ 1.8+) 991013 118 0.5+ 0.9+ 101008 585 0.5- 1.1- 1999/ 991018 867 0.3+ 0.5- 101008 585 0.4- 1.1- 990915 691 0.1- 0.5+ 991018 867 0.6- 0.3+ 101017 H15 0.3+ 0.1- 990915 691 0.1+ 0.3+ 991018 867 0.5+ 0.1- 101017 H15 0.1- 0.2- 990915 691 1.9+ 0.0 991018 867 0.4- 0.1+ 101017 H15 1.0+ 0.0 990916 691 0.2+ 0.3+ 991021 402 0.2- 0.5+ 101021 160(12.7+ 4.8+) 990916 691 0.3+ 0.7+ 991021 402 0.4- 1.5+ 101021 160(11.6+ 4.9+) 990916 691 0.1+ 0.4+ 991021 402 1.6+ 0.8+ 101021 160(10.5+ 3.9+) 991003 402 0.2+ 0.6- 2010/ 101103 H15 0.2- 0.9- 991003 402 1.7- 0.8- 100724 C51 1.5- 0.3+ 101103 H15 0.5- 0.4+ 991003 402 0.0 0.6+ 100724 C51 (0.0 3.3-) 101103 H15 0.0 1.0- 991003 402 1.6- 0.7- 100724 C51 (2.9- 0.1-) 101103 H15 0.0 0.7+ 991004 703 1.4- 0.8+ 100724 C51 1.7+ 0.3+ 101107 D96(20.5- 0.8-) 991004 703 1.0- 1.3+ 100725 C51 0.4- 1.2- 101112 204 0.3+ 0.1+ 991004 703 0.2- 0.8- 100725 C51 0.3+ 1.6- 101113 H10 0.6- 0.9+ 991004 360 0.1+ 0.5+ 100725 C51 (0.2- 2.3+) 101113 H10 0.6+ 0.9- 991004 360 0.9+ 0.2- 100725 C51 (1.4+ 5.1-) ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2018 Aug. 3

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