OAA computing section circular NK 649 112P/Urata-Niijima
The following improved orbital elements, by S. Nakano, are from 79 observations 1986-1994. Perturbations by Mercury to Neptune and five minor planets, Ceres, Pallas, Vesta, Iris and Bamberga were taken into account. The mean residual is +/- 0.87 arc second. Epoch = 1993 Aug. 1.0 TT T = 1993 July 13.57581 +/- 0.00085 (m.e.) TT Peri. = 21.48116 +/- 0.00029 Node = 31.91263 +/- 0.00027 (2000.0) Inc. = 24.21404 +/- 0.00013 q = 1.4566423 +/- 0.0000010 AU e = 0.5878659 +/- 0.0000003 a = 3.5343896 +/- 0.0000010 AU n' = 0.14833117 +/- 0.00000006 P = 6.645 +/- 0.0000028 years T = 1986 Nov. 22.93985 TT Epoch = 1986 Nov. 26.0 TT Peri. = 21.39423 e = 0.5891254 Node = 31.97335 (2000.0) a = 3.5271283 AU Inc. = 24.25626 n'= 0.14878947 q = 1.4492074 AU P = 6.624 years The predicted orbit for the 2000 return is as follows: T = 2000 Mar. 4.38478 TT Epoch = 2000 Feb. 26.0 TT Peri. = 21.45672 e = 0.5877730 Node = 31.94393 (2000.0) a = 3.5365526 AU Inc. = 24.20483 n'= 0.14819511 q = 1.4578625 AU P = 6.651 years The following residuals in seconds of arc are from the above orbital elements: 19/ 19/ 19/ 861004 675 (1.8- 3.6+) 861107 372 (2.4+ 1.4-) 861220 887 1.2- 0.3+ 861004 675 0.1+ 1.6- 861108 391 0.6- 0.2+ 861228 801 0.9- 0.3+ 861029 054 1.0+ 0.3+ 861108 391 (3.9+ 3.6-) 861229 691 0.8- 1.3- 861030 887 0.4- 0.5- 861108 561 (5.7- 1.3+) 861229 691 0.6- 1.2- 861030 887 0.3- 1.0+ 861110 561 (2.8+ 0.2-) 861229 691 0.7- 1.1- 861030 887 (3.1- 3.5+) 861111 892 0.7+ 0.1- 861230 691 0.6- 1.0- 861102 881 (0.5+ 3.0-) 861111 892 0.5+ 1.9- 861230 691 0.4- 0.8- 861102 881 2.2+ 1.0- 861121 373 0.0 1.4+ 861230 691 0.6- 0.4+ 861103 372 (4.8+ 1.2+) 861125 372 (2.6+ 1.7-) 870101 887 0.9- 0.6- 861103 372 (4.4+ 3.2+) 861125 372 0.8- 0.7- 870101 887 1.3- 0.2- 861104 561 (0.9- 5.2-) 861126 887 1.7- 1.1+ 870125 691 0.3- 0.6- 861104 561 (2.5- 2.9-) 861126 887 0.3- 1.8+ 870125 691 0.5- 0.7- 861104 373 (2.5+ 1.1+) 861126 881 0.9- 0.0 870125 691 0.2- 0.9- 861104 373 (2.5+ 0.5+) 861126 881 0.1- 0.6+ 870127 801 0.5- 0.8+ 861104 413 1.9+ 0.0 861126 399 0.1- 0.1- 870129 801 0.9- 0.2+ 861104 413 0.2- 0.7+ 861127 010 (1.3+ 4.6-) 870302 691 0.2- 0.1+ 861104 413 0.0 1.0+ 861127 010 (0.8+ 3.7-) 870302 691 0.6+ 0.1- 861104 372 (2.6- 6.7+) 861128 046 1.2+ 0.1+ 870302 691 0.4+ 1.2+ 861104 372 (2.6+ 3.0+) 861128 046 (1.0+ 4.1-) 870327 691 (4.1- 0.3-) 861105 413 0.2+ 0.4- 861128 494 1.2- 0.9+ 870327 691 2.2+ 0.9+ 861105 413 0.4+ 0.7- 861128 494 0.6- 0.1- 870327 691 1.1- 0.6- 861105 881 0.9- 0.9+ 861128 494 0.2+ 0.3+ 931020 691 0.9+ 0.6- 861105 010 (4.3+ 0.0 ) 861130 707 0.3+ 0.2+ 931020 691 0.2- 0.2- 861105 010 (9.4+ 3.3-) 861130 707 0.1- 0.0 931020 691 0.5- 1.0- 861106 688 1.0+ 0.1+ 861201 801 0.6- 0.2+ 931021 691 1.6- 0.4- 861106 688 (4.0+ 2.7-) 861201 691 0.9- 1.0- 931021 691 0.3- 1.2- 861106 657 (1.3- 5.2-) 861201 691 0.5- 1.0- 931210 691 0.8- 1.2- 861106 657 0.9- 0.6- 861201 691 0.6- 0.6- 931210 691 1.6- 0.9- 861106 399 1.7+ 0.5+ 861202 801 0.7- 0.3- 940107 691 (2.8- 1.1-) 861106 391 0.1+ 1.3- 861202 373 0.4- 0.6+ 940107 691 2.1- 0.9- 861106 391 (2.8+ 8.7-) 861202 373 0.8- 1.2+ 940107 691 1.5- 0.4- 861106 323 (2.2+ 2.5-) 861204 691 0.5+ 0.1+ 940406 691 0.1+ 0.2- 861107 691 1.0+ 0.8- 861206 399 1.1+ 1.9+ 940406 691 0.5- 0.2- 861107 691 0.0 0.2+ 861206 399 0.7+ 1.3+ 940406 691 0.4- 0.6- 861107 691 1.1+ 0.5- 861207 881 0.7- 1.5+ 861107 691 1.4+ 0.9- 861220 887 0.1- 1.8- ( ) -------- Rejected Obs.
Director, Computing Section Computed date Syuichi Nakano 1996 Nov. 8