Nakano Note (Nakano wa Kangaeru noda) NK 4340 141P/Machholz 2 - D (Component D in 1999, Component H in 2015)
The following improved orbital elements, by S. Nakano, are from 130 observations 1999 to 2021, component D in 1999, H in 2015 and Outer component in 2020. Planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II were taken into account. The mean residual is +/- 1.44 arc seconds. The comet has passed 0.93 AU from Jupiter on 2017 Oct. 14.0 UT. As written on NK 2996, component H in 2015 is identical with component D in 1994 and 1999. Corresponding with this, Outer component in 2020 is this nucleus D. Unfortunately orbit be no longer linked with 1994 observations and the residuals in 2020 are not so good. See the previous orbits in NK 642, NK 725, NK 726 (Nucleus D), MPC 35815, MPC 36175, MPC 36213, NK 842A, NK 842D (= MPC 37026, MPC 45656), NK 1173, NK 1458 (= MPC 59599), NK 2918, NK 2988, NK 2995, NK 2996 (Nucleus H), NK 3435 (HICQ 2020), NK 4183 (= CBET 4834) and NK 4339 (Nucleus I). Epoch = 2020 Dec. 17.0 TT T = 2020 Dec. 14.92239 +/- 0.00047 (m.e.) TT Peri. = 153.54047 +/- 0.00091 Node = 241.83987 +/- 0.00054 (2000.0) Inc. = 13.94928 +/- 0.00025 q = 0.8080285 +/- 0.0000021 AU e = 0.7355572 +/- 0.0000011 a = 3.0555893 +/- 0.0000149 AU n' = 0.18452771 +/- 0.00000135 P = 5.341 +/- 0.0000392 years A1 = +0.451 +/- 0.056 A2 = -0.03498 +/- 0.00028 T = 1999 Dec. 9.95921 TT Epoch = 1999 Dec. 8.0 TT Peri. = 149.29158 e = 0.7510439 Node = 246.13993 (2000.0) a = 3.0085178 AU Inc. = 12.81211 n'= 0.18887531 q = 0.7489890 AU P = 5.218 years T = 2005 Feb. 28.66128 TT Epoch = 2005 Mar. 11.0 TT Peri. = 149.26877 e = 0.7500652 Node = 246.16535 (2000.0) a = 3.0123616 AU Inc. = 12.79617 n'= 0.18851391 q = 0.7528939 AU P = 5.228 years [ T = 2010 May 24.51107 TT Epoch = 2010 June 13.0 TT Peri. = 149.35069 e = 0.7488267 Node = 246.08981 (2000.0) a = 3.0170927 AU Inc. = 12.80335 n'= 0.18807068 q = 0.7578132 AU P = 5.241 years ] T = 2015 Aug. 24.42119 TT Epoch = 2015 Aug. 6.0 TT Peri. = 149.46413 e = 0.7480949 Node = 246.01789 (2000.0) a = 3.0207340 AU Inc. = 12.81015 n'= 0.18773072 q = 0.7609384 AU P = 5.250 years Epoch changed orbit for 2021 January is as follows: T = 2020 Dec. 14.92251 TT Epoch = 2021 Jan. 26.0 TT Peri. = 153.54047 e = 0.7355838 Node = 241.83967 (2000.0) a = 3.0558900 AU Inc. = 13.94914 n'= 0.18450047 q = 0.8080269 AU P = 5.342 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1999/ 991110 360 0.2- 1.5- 150826 367 0.2+ 0.2+ 991017 413 0.5- 1.5+ 991110 360 0.7- 1.4- 150826 N55 (1.2- 4.3+) 991017 413 0.7- 1.1+ 991113 402 2.2+ 0.4- 150826 N55 (0.3+ 4.1+) 991017 413 1.0- 2.0+ 991113 897 (3.6+ 1.0+) 150826 N55 1.1+ 2.3+ 991021 402 2.4- 0.5- 991113 402 1.1+ 1.1- 150827 L51 1.3- 1.6+ 991021 402 2.2- 0.7+ 991113 402 0.5+ 1.1- 150827 L51 1.7- 0.6+ 991021 402 0.6+ 0.5+ 991113 897 (6.7+ 0.5+) 150827 L51 1.7- 0.5+ 991023 402 0.2+ 0.4+ 991118 349 0.9+ 1.8- 150827 L51 1.5- 1.0- 991023 402 1.5+ 1.1+ 991118 349 0.6+ 0.1- 150827 A77 (3.0+ 4.7-) 991023 402 1.8+ 0.3+ 991126 046 (1.4+ 4.5-) 150827 A77 1.9+ 1.8- 991023 402 0.9+ 1.1+ 991126 046 (1.6- 3.5-) 150827 G40 3.1- 1.0+ 991023 402 0.3- 1.2+ 991126 046 1.7- 2.6- 150827 G40 2.2- 0.5- 991025 897 1.5+ 0.7+ 991126 046 (3.6+ 3.7-) 150827 G40 0.0 0.2- 991025 897 1.4- 1.5+ 2015/ 150827 G40 2.1- 0.6+ 991025 402 1.0+ 1.3+ 150817 152 3.0- 1.0+ 150827 N55 1.5+ 1.9- 991025 402 0.8+ 0.6+ 150818 152 1.2+ 1.2+ 150827 N55 1.9+ 2.0- 991025 867 0.0 1.2+ 150819 H06(10.1+ 9.7-) 150827 N55 1.8+ 2.1- 991025 402 1.6+ 1.2- 150819 H06 (9.4+ 9.8-) 150828 A71 (7.1- 3.0+) 991025 402 2.2+ 0.4+ 150819 H06(10.3+ 10.4-) 150828 A71 0.4- 0.8+ 991025 402 0.4+ 0.4- 150822 L51 (3.6- 5.1+) 150828 A71 0.8- 3.3+ 991025 867 1.1- 1.3+ 150822 L51 (1.6+ 7.0+) 150828 A71 0.9- 0.1+ 991028 897 3.3- 1.7- 150823 L51 (1.5- 3.8-) 150828 A71 (5.6- 1.8+) 991028 897 1.5- 1.1- 150823 L51 2.5- 0.5- 150828 G40 1.4+ 1.4- 991029 402 1.1- 0.2+ 150824 W96 0.6+ 2.2- 150828 G40 1.9+ 1.6+ 991029 402 0.9+ 1.4+ 150824 W96 (7.0- 3.9-) 150828 G40 2.0+ 0.1+ 991029 402 1.4+ 0.0 150824 W96 (7.8- 4.9-) 150829 C23 1.6+ 0.7- 991029 402 0.7+ 0.1+ 150824 N55 (4.7+ 1.2-) 150829 C23 (6.4- 1.0+) 991029 402 0.7- 0.2+ 150824 N55 3.1+ 1.1+ 150829 G40 2.0- 0.6+ 991029 402 0.2- 0.3- 150824 N55 1.0+ 3.4+ 150829 G40 0.2- 0.2+ 991101 540 2.4+ 0.9+ 150825 L51 3.2+ 2.1- 150830 G40 1.6+ 0.1- 991101 540 0.8+ 1.6+ 150825 L51 (4.5+ 1.9-) 150830 G40 2.3- 0.7+ 991101 540 1.0+ 0.8+ 150825 L51 (4.1+ 0.7-) 150831 C10 2.4+ 0.0 991101 540 1.2+ 0.6+ 150825 G40 (4.4+ 1.7+) 150831 C10 (5.7- 2.3-) 991101 540 2.2+ 0.7+ 150825 G40 (4.3+ 0.3+) 150901 L51 1.8- 0.8+ 991102 372 0.7- 2.4+ 150825 W96 1.2- 1.6- 150901 L51 (5.0+ 1.3+) 991102 413 0.0 0.8- 150825 W96 2.0- 0.5+ 150901 L51 (4.6+ 0.6+) 991102 372 1.2- 2.3+ 150825 W96 0.4- 2.2+ 150901 L51 (5.8- 0.9+) 991103 402 2.3- 1.1- 150826 L51 0.4+ 2.2- 150905 L51 (0.9- 4.9+) 991103 360 0.6- 0.5- 150826 L51 2.9+ 0.0 150905 L51 (0.3+ 5.9+) 991103 402 0.4- 0.9- 150826 L51 0.4+ 2.3- 150906 L51 1.5- 0.3+ 991103 402 1.6- 0.7- 150826 A71 1.7- 1.1- 150906 L51 2.5- 0.8+ 991103 360 0.9- 0.5- 150826 A71 1.3- 0.9+ 150906 L51 2.8- 2.1+ 991103 367 0.1+ 0.4+ 150826 215 2.1+ 0.1- 150912 349 (0.0 5.5-) 991103 367 1.8+ 0.7+ 150826 215 3.1+ 0.3- 150912 349 1.7+ 2.9- 991103 367 0.6- 0.4- 150826 215 1.1+ 0.9+ 150915 H06(14.6+ 16.6-) 991104 360 0.2+ 0.4+ 150826 B49 1.7+ 0.4- 150915 H06(14.8+ 16.9-) 991104 360 0.0 0.1- 150826 B49 0.5+ 1.8- 2020/ 991104 360 0.8+ 0.7- 150826 B49 0.6+ 1.9- 201207 A71 1.5+ 0.2+ 991104 413 0.3- 0.6- 150826 J43 1.0- 1.8+ 201207 A71(13.2+ 7.1+) 991105 402 2.4+ 1.3- 150826 J43 0.3+ 0.7- 201208 194 (4.1+ 6.6-) 991105 402 1.8- 1.2- 150826 J43 1.5+ 0.8- 201208 194 0.9+ 1.1+ 991105 402 0.4- 1.4- 150826 G40 0.7- 1.1+ 201218 A71 3.1- 1.4- 991106 349 0.7+ 0.4- 150826 G40 (0.5+ 3.5+) 201218 A71 (4.2+ 5.5+) 991106 349 0.7- 2.2- 150826 G40 0.5- 0.9- 201231 A71 0.9- 2.1- 991107 402 0.8- 1.2- 150826 W96 1.9- 2.5+ 2021/ 991107 402 1.8- 0.7- 150826 W96 (3.9- 2.3+) 210101 A71 (2.9- 6.9+) 991107 402 0.6- 1.8- 150826 H06 0.4- 2.0+ 210101 A71 1.8+ 3.2+ 991109 372 (1.3- 4.0+) 150826 H06 (5.3- 0.3+) 991110 360 1.3- 1.0- 150826 367 3.2+ 1.0- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 Jan. 5