OAA computing section circular NK 941 112P/Urata-Niijima

The following improved orbital elements, by S. Nakano, are from 84 observations 1986 to 1999. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.97 arc second. Epoch = 2000 Feb. 26.0 TT T = 2000 Mar. 4.39406 +/- 0.00099 (m.e.) TT Peri. = 21.45824 +/- 0.00023 Node = 31.94385 +/- 0.00005 (2000.0) Inc. = 24.20469 +/- 0.00004 q = 1.4578628 +/- 0.0000010 AU e = 0.5877733 +/- 0.0000003 a = 3.5365564 +/- 0.0000009 AU n' = 0.14819488 +/- 0.00000006 P = 6.651 +/- 0.0000026 years T = 1986 Nov. 22.94190 TT Epoch = 1986 Nov. 26.0 TT Peri. = 21.39575 e = 0.5891258 Node = 31.97328 (2000.0) a = 3.5271317 AU Inc. = 24.25612 n'= 0.14878925 q = 1.4492074 AU P = 6.624 years T = 1993 July 13.58140 TT Epoch = 1993 Aug. 1.0 TT Peri. = 21.48268 e = 0.5878663 Node = 31.91255 (2000.0) a = 3.5343930 AU Inc. = 24.21391 n'= 0.14833096 q = 1.4566423 AU P = 6.645 years The predicted orbit for the 2006 return is as follows: T = 2006 Oct. 29.57587 TT Epoch = 2006 Nov. 1.0 TT Peri. = 21.44813 e = 0.5864884 Node = 31.92806 (2000.0) a = 3.5420838 AU Inc. = 24.16746 n'= 0.14784812 q = 1.4646927 AU P = 6.666 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1986/ 861108 391 (3.6+ 3.6-) 861230 691 0.4- 1.2- 861004 675 1.7- 1.9+ 861108 561 (6.0- 1.2+) 861230 691 0.2- 1.1- 861004 675 (0.3+ 3.2-) 861110 561 (2.5+ 0.2-) 861230 691 0.4- 0.1+ 861029 054 0.8+ 0.1- 861111 892 0.5+ 0.0 1987/ 861030 887 0.7- 0.8- 861111 892 0.3+ 1.8- 870101 887 0.7- 0.8- 861030 887 0.6- 0.7+ 861121 373 0.2- 1.6+ 870101 887 1.1- 0.4- 861030 887 (3.3- 3.2+) 861125 372 (2.5+ 1.5-) 870125 691 0.4- 1.2- 861102 881 (0.3+ 3.2-) 861125 372 0.9- 0.5- 870125 691 0.6- 1.2- 861102 881 1.9+ 1.2- 861126 887 1.8- 1.3+ 870125 691 0.2- 1.5- 861103 372 (4.5+ 1.0+) 861126 887 0.4- 1.9+ 870127 801 0.6- 0.3+ 861103 372 (4.2+ 3.0+) 861126 881 1.0- 0.1+ 870129 801 1.1- 0.4- 861104 561 (1.2- 5.4-) 861126 881 0.2- 0.8+ 870302 691 1.2- 0.4- 861104 561 (2.7- 3.1-) 861126 399 0.2- 0.1+ 870302 691 0.3- 0.6- 861104 373 2.2+ 0.9+ 861127 010 (1.3+ 4.4-) 870302 691 0.6- 0.7+ 861104 373 2.3+ 0.4+ 861127 010 (0.7+ 3.6-) 870327 691 (5.5- 0.3-) 861104 413 1.7+ 0.1- 861128 046 1.1+ 0.3+ 870327 691 0.7+ 0.9+ 861104 413 0.5- 0.5+ 861128 046 (1.0+ 3.9-) 870327 691 (2.6- 0.6-) 861104 413 0.2- 0.9+ 861128 494 1.3- 0.9+ 1993/ 861104 372 (2.9- 6.6+) 861128 494 0.7- 0.1+ 931020 691 (3.3+ 1.0-) 861104 372 (2.4+ 2.9+) 861128 494 0.1+ 0.5+ 931020 691 2.3+ 0.6- 861105 413 0.0 0.5- 861130 707 0.2+ 0.4+ 931020 691 2.0+ 1.4- 861105 413 0.2+ 0.8- 861130 707 0.1- 0.1+ 931021 691 0.8+ 0.8- 861105 881 1.1- 0.8+ 861201 801 0.6- 0.4+ 931021 691 2.1+ 1.7- 861105 010 (4.1+ 0.1-) 861201 691 0.9- 0.9- 931210 691 0.1- 1.2- 861105 010 (9.2+ 3.4-) 861201 691 0.5- 0.9- 931210 691 1.0- 0.9- 861106 688 0.7+ 0.1+ 861201 691 0.6- 0.4- 1994/ 861106 688 (3.7+ 2.8-) 861202 801 0.7- 0.1- 940107 691 (2.7- 0.8-) 861106 657 (1.6- 5.3-) 861202 373 0.4- 0.8+ 940107 691 2.1- 0.5- 861106 657 1.2- 0.7- 861202 373 0.8- 1.3+ 940107 691 1.4- 0.1- 861106 399 1.5+ 0.4+ 861204 691 0.5+ 0.2+ 940406 691 0.3+ 0.8+ 861106 391 0.2- 1.3- 861206 399 1.2+ 2.0+ 940406 691 0.3- 0.8+ 861106 391 (2.5+ 8.7-) 861206 399 0.8+ 1.4+ 940406 691 0.2- 0.4+ 861106 323 (2.0+ 2.6-) 861207 881 0.6- 1.6+ 1999/ 861107 691 0.8+ 0.9- 861220 887 0.1+ 1.9- 990908 250 0.2- 1.0+ 861107 691 0.3- 0.2+ 861220 887 0.9- 0.2+ 991113 695 1.7- 0.1- 861107 691 0.8+ 0.5- 861228 801 0.7- 0.1+ 991113 695 0.7- 0.2+ 861107 691 1.1+ 0.9- 861229 691 0.6- 1.5- 991113 695 0.9- 0.9- 861107 372 2.1+ 1.5- 861229 691 0.3- 1.4- 861108 391 0.8- 0.2+ 861229 691 0.5- 1.3- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2003 Apr. 20

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