OAA computing section circular NK 726 141P/Machholz 2-D

The following improved orbital elements, by S. Nakano, are from 110 observations 1994-1999, 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 +/- 1.02 arc seconds. See an old version orbit and a note on IAUC 7299. Epoch = 1999 Dec. 8.0 TT T = 1999 Dec. 9.95702 +/- 0.00125 (m.e.) TT Peri. = 149.29143 +/- 0.00083 Node = 246.13430 +/- 0.00050 (2000.0) Inc. = 12.81205 +/- 0.00014 q = 0.7490077 +/- 0.0000063 AU e = 0.7510682 +/- 0.0000055 a = 3.0088875 +/- 0.0000237 AU n' = 0.18884050 +/- 0.00000223 P = 5.219 +/- 0.0000617 years A1 = +2.165 +/- 0.240 A2 = +0.60515 +/- 0.07036 T = 1994 Sept.19.20781 TT Epoch = 1994 Sept. 5.0 TT Peri. = 149.25987 e = 0.7500790 Node = 246.17816 (2000.0) a = 3.0111518 AU Inc. = 12.78759 n'= 0.18862754 q = 0.7525501 AU P = 5.225 years The following residuals in seconds of arc are from the above orbital elements: 1994/ 940924 372 0.2- 0.3+ 991021 402 0.2+ 0.3- 940830 557 0.1+ 0.2- 940924 372 0.3+ 1.0- 991023 402 0.1- 0.2- 940830 557 0.1+ 0.5- 940925 372 0.6- 0.5+ 991023 402 1.2+ 0.4+ 940830 557 0.3- 0.0 940925 372 1.6+ 0.5- 991023 402 1.5+ 0.3- 940830 557 0.5+ 0.3- 940925 372 0.6+ 0.4+ 991023 402 0.6+ 0.5+ 940830 557 0.2+ 0.4- 940925 372 (1.3+ 3.1+) 991023 402 0.5- 0.5+ 940830 557 0.1+ 1.1- 940927 657 (2.7- 1.6+) 991025 402 0.9+ 0.8+ 940830 657 (2.8- 0.1+) 940927 657 2.2- 1.3+ 991025 402 0.6+ 0.1+ 940830 657 (3.7- 1.9-) 940927 657 (2.6- 1.6+) 991025 867 0.2- 0.8+ 940830 657 1.0+ 0.1+ 941002 360 (3.3- 2.5+) 991025 402 1.4+ 1.7- 940830 657 (0.5- 3.3-) 941002 360 1.3- 1.6+ 991025 402 2.0+ 0.1- 940901 658 (2.7- 1.0+) 941002 372 0.9+ 1.6+ Y 991025 402 0.2+ 0.8- 940901 658 (5.5- 2.1+) 941005 557 (1.9- 2.4+) 991025 867 1.3- 0.8+ 940901 360 (3.7- 0.9+) 941007 557 2.1- 1.1+ 991029 402 1.1- 0.0 940901 360 2.1- 0.3- 941007 557 1.6- 1.3+ 991029 402 0.9+ 1.2+ 940902 557 (2.4- 0.7+) 941007 557 (2.6- 1.6+) 991029 402 1.3+ 0.2- 940902 557 1.6- 0.8+ 941007 046 0.9- 1.1+ 991029 402 0.6+ 0.1- 940902 557 1.5+ 0.1+ 941007 046 (3.6- 1.3+) 991029 402 0.8- 0.0 940903 410 (3.0- 1.4+) 941007 046 (5.1- 1.2+) 991029 402 0.3- 0.5- 940903 410 (5.3- 1.7+) 941007 046 (2.7- 0.9-) 991101 540 (2.3+ 0.9+) 940903 410 (3.6- 0.1-) 941007 675 (3.8- 2.5+) 991101 540 0.7+ 1.7+ 940903 360 0.5- 1.0+ 941007 675 2.0- 1.0+ 991101 540 1.0+ 0.8+ 940903 360 1.5- 0.1- 941010 675 (4.0- 0.6-) 991101 540 1.2+ 0.7+ 940904 557 0.9- 1.8+ 941010 675 (3.6- 1.2+) 991101 540 2.2+ 0.7+ 940904 557 1.3- 1.7+ 941011 557 0.8- 0.2+ 991102 372 (0.7- 2.5+) 940904 557 0.7- 0.6+ 941011 557 0.0 0.6- 991102 413 0.0 0.7- 940904 675 (1.1- 6.3+) 941011 557 0.6+ 0.2- 991102 372 (1.2- 2.4+) 940905 540 (4.9- 0.0 ) 941014 360 1.5+ 0.6+ 991103 402 (2.3- 0.9-) 940906 675 (3.6- 1.8+) 941014 360 1.8+ 0.5- 991103 360 0.7- 0.3- 940908 540 1.2+ 1.0- 941016 540 (9.8- 8.8+) 991103 402 0.4- 0.7- 940908 540 (0.7+ 2.5-) 941016 540(10.0- 4.7+) 991103 402 1.7- 0.5- 940908 360 1.3+ 1.7- 941018 557 1.6+ 1.2- 991103 360 1.0- 0.3- 940908 360 1.4+ 1.5- 941018 557 1.8- 1.3+ 991103 367 0.1+ 0.6+ 940910 557 0.6+ 0.1- 941018 557 (3.1- 0.9+) 991103 367 1.8+ 0.9+ 940910 557 0.6- 1.2- 941018 557 2.0- 0.0 991103 367 0.6- 0.2- 940910 557 1.4+ 0.0 941018 557 (6.3- 1.1+) 991104 360 0.1+ 0.7+ 940910 557 (3.4+ 1.7-) 941022 897 1.8- 0.2+ 991104 360 0.1- 0.2+ 940910 557 1.5+ 0.3- 941022 897 2.0- 1.1- 991104 360 0.7+ 0.4- 940910 816 (3.5+ 0.7-) 941102 557 1.0- 0.9+ 991104 413 0.4- 0.3- 940910 816 0.8- 1.3+ 941102 557 0.7- 0.3- 991105 402 (2.3+ 1.0-) 940913 360 (3.2+ 2.1-) 941102 557 1.4+ 0.2- 991105 402 1.9- 0.9- 940913 360 (2.5+ 2.3-) 941109 691 1.6+ 0.4+ 991105 402 0.5- 1.0- 940916 372 (4.5- 0.0 ) 941109 691 0.0 1.0- 991107 402 1.0- 0.7- 940916 372 (4.1- 0.3+)Y 941110 691 (4.9+ 0.1-) 991107 402 2.0- 0.2- 940916 372 1.6- 0.0 Y 941110 691 (2.5+ 1.3+) 991107 402 0.8- 1.2- 940916 372 1.0- 0.4+ 941208 691 (4.4+ 1.8+) 991109 372 (1.5- 4.7+) 940923 557 1.7+ 1.1- 941208 691 (0.9+ 4.2+) 991110 360 1.5- 0.2- 940923 557 2.0+ 1.1- 941208 691 1.0+ 1.1- 991110 360 0.5- 0.8- 940923 557 1.9+ 0.8- 1999/ 991110 360 1.0- 0.7- 940923 557 1.8+ 0.9- 991017 413 1.0- 0.4+ 991113 402 1.7+ 0.6+ 940923 557 2.0+ 1.3- 991017 413 1.3- 0.0 991113 402 0.7+ 0.1- 940924 372 0.2- 0.7+ 991017 413 1.6- 1.0+ 991113 402 0.0 0.1- 940924 372 0.9+ 0.8- 991021 402 (2.7- 1.3-) 940924 372 0.2+ 0.1+ 991021 402 (2.5- 0.1-) ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1999 Nov. 21

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