OAA computing section circular NK 689 130P/McNaught-Hughes

The following improved orbital elements, by S. Nakano, are from 63 observations 1991-1998, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta. The mean residual is +/- 0.59 arc seconds. Epoch = 1998 Mar. 8.0 TT T = 1998 Feb. 23.78388 +/- 0.00037 (m.e.) TT Peri. = 224.36828 +/- 0.00025 Node = 89.97237 +/- 0.00024 (2000.0) Inc. = 7.30335 +/- 0.00002 q = 2.1162925 +/- 0.0000005 AU e = 0.4041125 +/- 0.0000001 a = 3.5514968 +/- 0.0000003 AU n' = 0.14726072 +/- 0.00000002 P = 6.693 +/- 0.0000009 years T = 1991 June 16.12252 TT Epoch = 1991 July 3.0 TT Peri. = 224.43083 e = 0.4023381 Node = 89.98057 (2000.0) a = 3.5562047 AU Inc. = 7.30028 n'= 0.14696839 q = 2.1254081 AU P = 6.706 years The predicted orbit for the 2004 return is as follows: T = 2004 Oct. 23.28494 TT Epoch = 2004 Nov. 11.0 TT Peri. = 224.12053 e = 0.4058890 Node = 89.88603 (2000.0) a = 3.5418456 AU Inc. = 7.30698 n'= 0.14786304 q = 2.1042495 AU P = 6.666 years The following residuals in seconds of arc are from the above orbital elements: 1991/ 920115 413 1.5+ 1.2+ 970528 691 0.2- 0.2- 910914 675 0.4- 0.0 920115 413 (4.5+ 0.1-) 970528 691 0.1- 0.5- 910914 675 0.6- 0.2- 1993/ 970531 360 1.2+ 0.0 910930 413 0.3- 0.0 930101 691 0.3- 0.3- 970531 360 1.1+ 0.4- 910930 413 0.5+ 0.4- 930101 691 0.3+ 0.5- 970603 691 0.2- 0.3- 911001 413 0.3- 0.3+ 930101 691 0.4+ 0.5- 970603 691 0.0 0.5- 911002 413 0.7- 0.7- 930122 691 0.4- 0.3- 970603 691 0.1- 0.3- 911002 413 (2.4+ 0.3+) 930122 691 0.5- 0.9- 1998/ 911005 413 0.3- 0.1+ 930122 691 0.2+ 0.7- 980728 696 0.1- 0.2+ 911009 801 0.1+ 0.7- 1997/ 980728 696 0.3+ 0.2+ 911009 801 0.5- 0.2- 970416 691 0.0 0.5+ 980728 696 0.0 0.2+ 911009 413 0.5- 0.0 970416 691 0.3- 0.2+ 980804 360 1.1- 0.0 911011 675 (3.1+ 0.5-) 970416 691 0.0 0.1- 980804 360 0.7- 0.1+ 911011 675 (0.1+ 3.0+) 970429 360 0.2+ 0.2+ 980804 360 0.2- 0.4+ 911012 413 0.6+ 0.4+ 970429 360 0.3- 0.2+ 980831 691 0.2- 0.1- 911013 675 0.4+ 1.6- 970429 360 0.7+ 0.7+ 980831 691 0.2- 0.0 911013 675 1.3+ 0.7+ 970503 691 0.9- 0.0 980831 691 0.6- 0.0 911102 413 1.2- 0.6+ 970503 691 1.1- 0.0 980902 402 0.3+ 0.3- 911108 413 0.3- 0.0 970503 691 1.0- 0.1- 980902 402 0.1- 0.4- 911108 413 0.4- 0.2+ 970506 402 0.6+ 1.6- 980902 867 0.3+ 0.5- 911126 413 (2.2+ 0.1-) 970506 402 1.0+ 1.0- 980902 402 0.8+ 0.7+ 911126 413 1.4+ 0.4- 970509 402 (2.2+ 1.2+) 980902 867 0.5+ 0.1- 911127 413 1.3+ 0.1+ 970509 402 1.7- 0.1- 980902 360 0.2+ 0.3- 911127 413 1.3+ 0.2+ 970509 402 (1.9+ 2.7-) 980902 867 0.5+ 0.2- 1992/ 970528 691 0.1- 0.3- 980902 360 0.1+ 0.4- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1998 Sept. 7

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