Nakano Note (Nakano wa Kangaeru noda) NK 4556 142P/Ge-Wang
The following improved orbital elements, by S. Nakano, are from 71 observations 1999 to 2021, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of sublimating molecule = CO (or N2) using Yabushita's theory (MN 283, 347). The mean residual is +/- 0.78 arc second. Residuals of re-observations on 2021 October and November were -37" for Right Ascension and -7" for Declination from the prediction in NK 3643 (= HICQ 2020/2021) with the delta-T correction = +0.03 day. The comet will pass 0.99 AU from Jupiter on 2029 Sept. 30, 1.88 AU from Saturn on 2038 Apr. 7 and 0.71 AU from Jupiter on 2041 Sept. 8 UT. The observations on 2020 July 18 (Q68), 2021 Aug. 16 (213) and 2021 Sept. 8 (X03) don't belong with this comet. See the previous orbits in NK 533, NK 1151, NK 1999 and NK 3643. Epoch = 2021 May 26.0 TT T = 2021 May 12.70891 +/- 0.02010 (m.e.) TT Peri. = 173.97057 +/- 0.00696 Node = 175.93197 +/- 0.00104 (2000.0) Inc. = 12.25042 +/- 0.00040 q = 2.5130680 +/- 0.0001321 AU e = 0.4976888 +/- 0.0000285 a = 5.0030103 +/- 0.0003864 AU n' = 0.08807588 +/- 0.00001022 P = 11.190 +/- 0.0012960 years Y1 = -0.809 +/- 0.566 Y2 = -0.00721 +/- 0.00576 (+/- 0.47 day) T = 1999 June 21.43658 TT Epoch = 1999 July 1.0 TT Peri. = 177.38044 e = 0.5002556 Node = 177.14289 (2000.0) a = 4.9961983 AU Inc. = 12.17466 n'= 0.08825607 q = 2.4968223 AU P = 11.168 years T = 2010 May 30.47111 TT Epoch = 2010 June 13.0 TT Peri. = 175.72915 e = 0.5000506 Node = 176.51743 (2000.0) a = 4.9765647 AU Inc. = 12.30615 n'= 0.08877886 q = 2.4880307 AU P = 11.102 years The predicted orbit for the 2032 return is as follows: T = 2032 June 20.34484 TT Epoch = 2032 June 17.0 TT Peri. = 174.57178 e = 0.4969156 Node = 172.46085 (2000.0) a = 5.0854692 AU Inc. = 11.56431 n'= 0.08594241 q = 2.5584202 AU P = 11.468 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1999/ 991018 867 0.8+ 0.3- 101021 160(12.7+ 4.9+) 990915 691 0.5- 0.7+ 991018 867 0.2- 0.1- 101021 160(11.5+ 5.0+) 990915 691 0.4- 0.5+ 991021 402 0.1+ 0.2+ 101021 160(10.4+ 3.9+) 990915 691 1.4+ 0.3+ 991021 402 0.1- 1.3+ 101103 H15 0.2- 0.9- 990916 691 0.2- 0.5+ 991021 402 1.9+ 0.5+ 101103 H15 0.5- 0.3+ 990916 691 0.1- 0.9+ 2010/ 101103 H15 0.0 1.1- 990916 691 0.3- 0.6+ 100724 C51 0.7- 0.7+ 101103 H15 0.1+ 0.6+ 991003 402 0.2+ 0.6- 100724 C51 (3.6+ 1.2+) 101107 D96(20.5- 0.9-) 991003 402 1.7- 0.7- 100724 C51 (2.1- 0.0 ) 101112 204 0.4+ 0.1- 991003 402 0.1- 0.7+ 100724 C51 (2.4+ 0.5+) 101113 H10 0.6- 0.7+ 991003 402 1.7- 0.7- 100725 C51 0.1+ 0.7- 101113 H10 0.7+ 1.1- 991004 703 1.4- 0.9+ 100725 C51 0.8+ 1.1- 2020/ 991004 703 1.0- 1.3+ 100725 C51 (0.3+ 2.6+) 200718 Q68(12.0- 1.3-) 991004 703 0.2- 0.7- 100725 C51 (1.9+ 4.7-) 200718 Q68(10.8- 0.6-) 991004 360 0.1+ 0.5+ 100725 C51 (0.7+ 2.6-) 200718 Q68 (6.2+ 6.2+) 991004 360 0.8+ 0.1- 100725 C51 0.2- 1.2- 2021/ 991004 360 0.1+ 0.5+ 100725 C51 0.6+ 0.7+ 210816 213(60.5- 8.6+) 991008 897 1.3- 1.8+ 100725 C51 1.0- 1.7- 210816 213 (9.2- 42.2-) 991008 897 0.7- 1.2+ 100725 C51 1.0+ 0.8+ 210908 X03(34.9+ 1.5-) 991009 704 1.1+ 0.2- 100726 C51 1.5- 0.2+ 210908 X03(34.9+ 1.6-) 991009 704 0.1- 0.1- 100726 C51 1.8+ 0.3+ 210908 X03(34.5+ 0.2-) 991009 704 0.6- 0.4+ 100726 C51 0.7- 0.9- 211003 F51 0.5+ 0.3- 991009 704 0.6+ 0.1+ 100822 A77 0.0 0.8+ 211003 F51 0.7+ 0.1- 991009 372 (0.9+ 5.3-) 100822 A77 0.7+ 1.3+ 211003 F51 0.5+ 0.1- 991013 118 0.6+ 0.5- 100822 A77 1.2+ 0.1- 211011 215 0.4+ 0.9- 991013 118 0.0 1.8- 100918 C10 0.3- 0.8+ 211011 215 0.4- 0.1+ 991013 118 0.4- 0.3- 100918 C10 (3.3+ 1.3-) 211011 215 1.5- 0.3+ 991013 118 1.2+ 0.7- 101008 585 0.6- 0.9- 211106 X03 0.6- 0.2- 991013 118 0.3+ 1.3- 101008 585 0.5- 0.9- 211106 X03 1.1+ 1.7+ 991013 118 0.7+ 0.8+ 101017 H15 0.2+ 0.0 211106 X03 0.6- 0.3- 991018 867 0.5+ 0.7- 101017 H15 0.1- 0.0 211106 X03 0.0 0.2- 991018 867 0.3- 0.1+ 101017 H15 0.9+ 0.2+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 Nov. 16