OAA computing section circular NK 792 130P/McNaught-Hughes
The following improved orbital elements, by S. Nakano, are from 91 observations 1991-1999. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.53 arc second. See an orbit on NK 689 (= MPC 32411). Epoch = 1998 Mar. 8.0 TT T = 1998 Feb. 23.78489 +/- 0.00033 (m.e.) TT Peri. = 224.36799 +/- 0.00021 Node = 89.97299 +/- 0.00020 (2000.0) Inc. = 7.30335 +/- 0.00002 q = 2.1162929 +/- 0.0000004 AU e = 0.4041124 +/- 0.0000001 a = 3.5514969 +/- 0.0000003 AU n' = 0.14726072 +/- 0.00000002 P = 6.693 +/- 0.0000007 years T = 1991 June 16.12345 TT Epoch = 1991 July 3.0 TT Peri. = 224.43054 e = 0.4023380 Node = 89.98118 (2000.0) a = 3.5562048 AU Inc. = 7.30028 n'= 0.14696838 q = 2.1254085 AU P = 6.706 years The predicted orbit for the 2004 return is as follows: T = 2004 Oct. 23.28615 TT Epoch = 2004 Nov. 11.0 TT Peri. = 224.12024 e = 0.4058889 Node = 89.88665 (2000.0) a = 3.5418459 AU Inc. = 7.30698 n'= 0.14786302 q = 2.1042501 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(") 1991/ 970416 691 0.3+ 0.5+ 980902 402 0.4+ 0.7+ 910914 675 0.4- 0.0 970416 691 0.0 0.2+ 980902 867 0.1+ 0.1- 910914 675 0.6- 0.2- 970416 691 0.3+ 0.1- 980902 360 0.2- 0.3- 910930 413 0.3- 0.0 970429 360 0.6- 0.2+ 980902 867 0.1+ 0.1- 910930 413 0.5+ 0.4- 970429 360 1.1- 0.2+ 980902 360 0.2- 0.4- 911001 413 0.3- 0.3+ 970429 360 0.1- 0.7+ 980916 693 0.2+ 0.0 911002 413 0.6- 0.7- 970503 691 0.7- 0.0 980916 693 0.1+ 0.0 911002 413 (2.4+ 0.3+) 970503 691 0.9- 0.0 980916 693 0.1- 0.1+ 911005 413 0.3- 0.2+ 970503 691 0.8- 0.2- 981024 360 0.8+ 0.4- 911009 801 0.1+ 0.7- 970506 402 0.2- 1.6- 981024 360 0.7+ 0.5- 911009 801 0.5- 0.2- 970506 402 0.2+ 1.0- 981025 402 0.3+ 0.1- 911009 413 0.5- 0.0 970509 402 1.4+ 1.2+ 981025 402 0.2+ 0.5- 911011 675 (3.2+ 0.5-) 970509 402 (2.5- 0.2-) 981025 402 0.4- 0.3- 911011 675 (0.1+ 3.0+) 970509 402 (1.1+ 2.7-) 981029 704 0.0 1.3+ 911012 413 0.6+ 0.4+ 970528 691 0.1+ 0.3- 981029 704 0.1- 0.6- 911013 675 0.4+ 1.6- 970528 691 0.1+ 0.3- 981029 704 0.3- 0.5- 911013 675 1.3+ 0.7+ 970528 691 0.1+ 0.5- 981029 704 0.5- 0.2- 911102 413 1.2- 0.7+ 970531 360 0.4+ 0.0 981029 704 (5.2- 0.1+) 911108 413 0.4- 0.1+ 970531 360 0.3+ 0.5- 981112 360 0.3+ 0.2+ 911108 413 0.4- 0.3+ 970603 691 0.0 0.3- 981112 360 0.0 0.3+ 911126 413 (2.1+ 0.0 ) 970603 691 0.3+ 0.5- 981113 867 0.1- 0.0 911126 413 1.3+ 0.3- 970603 691 0.2+ 0.3- 981113 867 0.0 0.0 911127 413 1.3+ 0.1+ 1998/ 981113 867 0.2- 0.1+ 911127 413 1.2+ 0.2+ 980728 696 0.3- 0.2+ 981123 693 0.3+ 0.3+ 1992/ 980728 696 0.1+ 0.2+ 981123 693 0.4+ 0.2+ 920115 413 1.3+ 1.2+ 980728 696 0.2- 0.2+ 981123 693 0.4+ 0.3+ 920115 413 (4.3+ 0.1-) 980804 360 1.3- 0.0 981126 402 0.3+ 0.5+ 1993/ 980804 360 0.9- 0.1+ 981126 402 0.3- 0.2+ 930101 691 0.4- 0.1- 980804 360 0.4- 0.4+ 981126 402 0.1- 1.3+ 930101 691 0.3+ 0.4- 980831 691 0.5+ 0.0 981219 691 0.2- 0.0 930101 691 0.4+ 0.3- 980831 691 0.5+ 0.0 981219 691 0.4+ 0.2+ 930122 691 0.4- 0.2- 980831 691 0.2+ 0.1+ 981219 691 0.5+ 0.0 930122 691 0.5- 0.8- 980902 402 0.0 0.3- 1999/ 930122 691 0.2+ 0.6- 980902 402 0.5- 0.4- 990115 693 1.0- 1.3- 1997/ 980902 867 0.0 0.5- 990115 693 0.9- 0.4- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2001 Apr. 28