Nakano Note (Nakano wa Kangaeru noda) NK 4183 141P/Machholz 2-A = P213Rbq (NEOCP)
The following improved orbital elements, by S. Nakano, are from 266 observations 2005 to 2020, 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 +/- 0.94 arc second. Identification suggested by D. Bell. Residuals for re-observations were -18" for Right Ascension and -9" for Declination from the prediction in NK 3435 (= HICQ 2020) with the delta-T correction = +0.025 day. The comet has passed 0.93 AU from Jupiter on 2017 Oct. 13 UT and will pass 0.53 AU from the Earth on 2021 Jan. 19 UT. The comet has missed in 2010 return. 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) and NK 3435. Epoch = 2020 Dec. 17.0 TT T = 2020 Dec. 16.26997 +/- 0.00059 (m.e.) TT Peri. = 153.54399 +/- 0.00019 Node = 241.84951 +/- 0.00012 (2000.0) Inc. = 13.94456 +/- 0.00003 q = 0.8079340 +/- 0.0000004 AU e = 0.7356668 +/- 0.0000009 a = 3.0564980 +/- 0.0000106 AU n' = 0.18444543 +/- 0.00000096 P = 5.344 +/- 0.0000277 years A1 = +0.372 +/- 0.024 A2 = +0.03042 +/- 0.00015 T = 2005 Feb. 28.24835 TT Epoch = 2005 Mar. 11.0 TT Peri. = 149.27843 e = 0.7501302 Node = 246.16572 (2000.0) a = 3.0127704 AU Inc. = 12.79585 n'= 0.18847555 q = 0.7528003 AU P = 5.229 years [ T = 2010 May 24.52279 TT Epoch = 2010 June 13.0 TT Peri. = 149.36131 e = 0.7489010 Node = 246.08989 (2000.0) a = 3.0176926 AU Inc. = 12.80307 n'= 0.18801460 q = 0.7577396 AU P = 5.242 years ] T = 2015 Aug. 25.02115 TT Epoch = 2015 Aug. 6.0 TT Peri. = 149.47494 e = 0.7481753 Node = 246.01793 (2000.0) a = 3.0214359 AU Inc. = 12.80987 n'= 0.18766531 q = 0.7608722 AU P = 5.252 years The predicted orbit for the 2026 return is as follows: T = 2026 Apr. 23.13453 TT Epoch = 2026 Apr. 30.0 TT Peri. = 153.64837 e = 0.7358060 Node = 241.77030 (2000.0) a = 3.0563737 AU Inc. = 13.96016 n'= 0.18445668 q = 0.8074757 AU P = 5.343 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2005/ 150819 A77 0.5+ 2.1+ 150909 A77 0.9+ 1.0- 050227 A71 (4.4+ 1.5+) 150819 H06 0.1- 0.0 150909 A77 0.9+ 0.7- 050313 A71 (8.7+ 1.4+) 150819 H06 0.4- 0.1- 150909 A77 0.9+ 0.6- 050316 349 1.1+ 1.2- 150819 H06 1.1- 0.6+ 150910 C23 2.1- 1.0+ 050316 349 0.5+ 0.9- 150820 C23 0.7+ 1.2- 150910 C23 1.1- 0.1- 050316 349 0.9+ 2.0- 150820 C23 0.9- 1.2+ 150910 C23 0.1+ 0.2+ 050321 349 1.2- 0.3- 150820 C23 2.1+ 0.4- 150910 I81 0.0 0.8- 050321 349 0.8- 0.0 150820 A77 0.9+ 0.2- 150910 I81 1.3+ 1.4- 050326 349 0.3+ 0.1+ 150820 A77 1.2+ 0.1- 150910 I81 2.0+ 1.4- 050326 349 0.3+ 0.3+ 150820 A77 0.3+ 0.3+ 150910 I81 0.5+ 0.8- 050330 360 0.4- 0.6+ 150821 C10 0.8- 0.9+ 150911 160 0.4+ 0.4+ 050330 360 0.3- 0.4- 150821 C10 0.6- 0.0 150911 160 0.3+ 0.2+ 050330 360 0.3+ 0.5+ 150821 C10 0.3- 0.4+ 150911 B96 (0.4+ 3.4+) 050330 360 0.3- 0.4+ 150822 B96 0.6+ 0.0 150911 B96 0.1+ 1.2+ 050413 213 (4.3- 0.6+) 150822 B96 0.8- 0.9- 150911 B96 0.2+ 1.4+ 050413 213 (3.9- 0.8+) 150822 B96 0.4- 0.1+ 150911 349 0.5- 1.3+ 2015/ 150822 A77 0.3+ 0.3+ 150911 349 1.1- 0.8+ 150524 C51 1.8- 0.4- 150822 A77 0.4+ 0.1+ 150911 D95 0.4+ 0.7+ 150524 C51 0.5+ 0.5+ 150823 B96 1.3- 0.3+ 150911 D95 0.1+ 0.3+ 150524 C51 0.5- 1.1+ 150823 B96 1.6- 1.2- 150911 D95 0.2+ 0.5- 150524 C51 0.4+ 2.2- 150823 A71 1.1- 0.2+ 150912 160 0.1+ 0.4+ 150525 C51 0.4+ 0.9- 150823 B96 (1.7- 3.2-) 150912 160 0.1- 1.4+ 150525 C51 0.8- 0.2+ 150823 A71 1.7- 0.7+ 150912 160 1.8- 2.2+ 150525 C51 0.7+ 0.8+ 150823 A71 1.3- 0.3+ 150912 349 0.0 0.9+ 150525 C51 1.0- 0.1- 150823 J22 (3.0- 0.2-) 150912 349 0.6+ 0.1+ 150525 C51 0.8- 1.1+ 150823 J22 1.8- 0.7+ 150913 A71 0.5- 0.2- 150525 C51 0.1+ 1.3+ 150823 J22 1.6- 0.2+ 150913 A71 0.4- 0.6+ 150525 C51 0.0 1.8+ 150825 B51 1.0- 0.5+ 150913 A71 0.2+ 0.6+ 150525 C51 0.9- 0.6+ 150825 B51 2.3- 1.7+ 150913 A71 1.0+ 0.3- 150525 C51 1.6- 0.2+ 150826 I81 1.1+ 0.3- 150913 A71 1.4+ 0.2- 150525 C51 1.4+ 0.1+ 150826 I81 0.0 0.2+ 150913 I81 (5.1+ 1.7-) 150525 C51 0.3+ 0.7+ 150826 I81 0.5+ 0.1+ 150913 I81 (4.3+ 1.5-) 150526 C51 1.4- 0.1+ 150826 A71 0.5+ 0.8+ 150913 I81 1.6+ 0.8- 150526 C51 0.8- 0.7- 150826 A71 0.2+ 0.2- 150913 J22 0.6+ 0.7+ 150526 C51 1.7- 1.0- 150826 A71 1.4- 0.6+ 150913 J22 0.3+ 1.0- 150526 C51 0.5- 1.2+ 150826 A71 1.3- 0.4+ 150913 J22 0.1+ 0.4- 150526 C51 0.4- 0.3- 150826 B51 1.1- 0.3+ 150914 A71 0.6- 1.4+ 150526 C51 0.3+ 0.6- 150826 A71 1.0- 1.2+ 150914 A71 0.5+ 0.6- 150526 C51 0.1- 1.2+ 150826 A71 0.9- 0.3- 150914 W96 0.6- 0.3+ 150526 C51 0.1+ 1.1+ 150826 215 1.9- 0.7+ 150914 W96 0.1+ 1.3- 150526 C51 1.0- 1.5+ 150826 A71 0.3+ 0.1+ 150915 H06 2.1+ 0.2+ 150526 C51 1.6- 2.0+ 150826 215 1.0- 0.5+ 150915 H06 1.5+ 0.7+ 150526 C51 0.2- 0.2+ 150826 215 0.9- 0.3+ 150918 A77 1.4+ 2.1+ 150527 C51 0.0 0.5+ 150826 B51 1.3- 0.5+ 150918 A77 1.2+ 0.5- 150527 C51 0.9- 1.0+ 150826 C95 2.3- 1.6+ 150920 G40 0.0 0.2- 150527 C51 0.6- 0.1- 150826 B51 1.7- 0.9+ 150920 G40 0.5+ 0.1- 150527 C51 0.4- 0.4- 150826 C95 1.1- 1.4+ 150920 D95 0.3+ 0.4+ 150527 C51 0.8- 0.3+ 150826 C95 1.6- 1.2+ 150920 D95 0.1- 0.0 150527 C51 1.1- 0.0 150826 A77 0.6+ 0.0 150920 D95 0.1+ 0.0 150527 C51 0.2- 0.5+ 150826 A77 0.7+ 0.0 150921 A71 0.1+ 0.0 150528 C51 1.2- 0.4+ 150826 A77 1.0+ 0.5- 150921 A71 0.9+ 1.3+ 150528 C51 0.1- 0.6+ 150826 J43 1.0- 0.1+ 150921 C23 0.5- 1.1- 150528 C51 0.4- 0.5+ 150826 J43 0.8- 0.5+ 150921 C23 1.0- 0.4- 150528 C51 1.9- 0.8- 150826 J43 0.1- 0.0 150921 C23 0.6- 0.0 150529 C51 0.0 0.5+ 150826 W96 1.4- 0.2- 150921 367 0.3- 0.4+ 150607 160(27.6- 5.6+) 150826 W96 1.4- 2.1+ 150921 367 0.1+ 0.2+ 150607 160(29.9- 5.8+) 150826 H06 1.6- 0.5+ 150921 367 0.5- 0.3+ 150711 215 0.3+ 0.7- 150826 H06 1.9- 1.2+ 150922 J22 0.2+ 0.2+ 150711 215 0.7+ 0.3- 150826 367 1.1- 0.6+ 150922 J22 0.1+ 0.3+ 150711 215 2.4+ 0.1+ 150826 367 0.9- 0.8+ 150922 J22 1.2- 1.7+ 150714 A77 (2.4+ 3.1-) 150826 367 1.0- 0.6+ 150927 C23 2.5- 0.4+ 150714 A77 1.9+ 0.5- 150827 A77 0.2- 0.4- 150927 C23 1.2+ 0.3- 150716 A77 (4.7+ 0.4-) 150827 A77 0.4- 0.6- 150927 C23 0.1+ 1.1+ 150716 A77 2.2+ 0.4- 150827 A77 0.2+ 0.0 150927 C23 1.7+ 0.5- 150716 A77 (5.4+ 0.1-) 150828 A71 2.2- 1.0+ 150928 C10 0.7+ 0.1+ 150716 W96 (4.3+ 1.5-) 150828 A71 0.7- 0.1- 150928 C10 0.4+ 0.0 150716 W96 2.5+ 1.6- 150828 A71 0.9+ 0.0 150930 G40 0.8+ 0.5- 150717 A77 (3.2+ 0.6-) 150829 C23 0.9- 0.5+ 150930 G40 1.5+ 0.1- 150717 A77 (4.8+ 1.3-) 150829 C23 0.1- 0.1+ 151003 349 2.6+ 0.7- 150718 C10 (3.4+ 4.1-) 150829 C23 1.3- 1.0+ 151003 349 (3.4+ 1.8-) 150718 C10 (1.8+ 3.1-) 150829 J22 1.3+ 0.2- 151009 585 1.2+ 0.9- 150718 C10 2.0+ 1.6+ 150829 J22 0.3- 0.0 151009 585 1.4+ 1.3- 150718 C10 1.0+ 0.8- 150829 J22 0.3- 0.1- 151009 367 1.6+ 0.1- 150718 C10 2.3+ 2.2- 150830 213 1.1+ 1.5- 151009 367 1.6+ 0.9+ 150718 A77 (5.4+ 0.7-) 150830 213 0.9+ 1.4- 151011 C10 (3.0+ 0.3-) 150718 C10 1.2+ 1.8- 150830 213 0.7+ 0.2- 151011 C10 (0.4+ 6.2+) 150718 A77 (4.4+ 2.6-) 150830 G40 0.8- 1.1+ 151016 585 (2.8+ 0.6-) 150718 349 1.3+ 0.5- 150830 G40 0.5- 0.6+ 151016 585 (2.9+ 1.4-) 150718 349 1.9+ 0.2+ 150830 G40 0.7- 0.9+ 151016 585 (2.8+ 1.9-) 150723 W96 1.8+ 1.1- 150831 C10 1.2- 0.2- 151016 D95 2.3+ 1.5- 150723 W96 (0.6+ 4.6-) 150831 C10 1.2- 2.3+ 151016 D95 2.4+ 0.7- 150725 367 0.2- 1.4- 150831 C10 1.4- 1.4+ 151017 367 2.0+ 0.7- 150725 367 0.0 2.0- 150903 W96 0.2- 0.6- 151017 367 2.6+ 0.0 150727 372 0.4- 1.8- 150905 U69 0.6+ 0.8+ 151020 160 1.7+ 0.4- 150727 372 0.2- 2.0- 150905 U69 1.3- 0.3+ 151020 160 2.3+ 0.4+ 150728 G40 0.7- 0.8- 150905 U69 0.1- 0.2- 151020 160 (3.7+ 2.0+) 150728 G40 0.2- 0.3- 150907 A71 0.3- 0.3+ 2020/ 150728 G40 0.5- 0.8- 150907 A71 0.0 0.3- 200813 F52 0.1- 0.1+ 150813 215 0.7- 0.1- 150907 A71 0.2- 0.3- 200813 F52 0.0 0.0 150813 215 0.4- 0.9+ 150907 A71 0.5+ 1.2+ 200813 F52 0.2- 0.0 150813 215 0.7- 0.5+ 150907 A71 0.5- 0.5+ 200815 H21 0.1- 0.1+ 150816 I81 2.6+ 1.2- 150907 I81 1.0+ 0.6- 200815 H21 0.2- 0.3+ 150816 I81 2.7+ 1.3- 150907 A71 0.4- 0.1+ 200815 H21 0.3- 0.1+ 150816 I81 2.4+ 0.8- 150907 I81 2.6+ 0.8- 200816 711(37.9- 0.1+) 150817 152 1.7+ 2.7- 150907 I81 1.8+ 1.1- 200816 711(38.9- 0.4+) 150817 152 2.6- 1.5+ 150907 160 0.1+ 0.3- 200816 711(40.0- 0.6+) 150817 152 1.6- 1.8+ 150907 160 0.3- 2.4+ 200816 J04 0.1- 0.2+ 150818 152 0.8- 0.8+ 150907 160 0.8+ 2.7+ 200816 J04 0.3+ 0.0 150819 A71 1.3+ 0.4+ 150909 215 0.4+ 0.0 200816 J04 0.2- 0.1+ 150819 A71 1.6+ 0.2+ 150909 215 0.3+ 0.1+ 150819 A77 0.2+ 0.6+ 150909 215 1.7- 0.4+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2020 Aug. 18