OAA computing section circular NK 1664 P/1998 U4 (Spahr)

The following improved orbital elements, by S. Nakano, are from 134 observations 1997 Oct. 29 to 2001 Apr. 15. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.68 arc second. See orbits on MPC 32866, MPC 33189, MPC 33451, MPC 36653 and NK 756. Epoch = 1999 Mar. 3.0 TT T = 1999 Feb. 26.51243 +/- 0.00120 (m.e.) TT Peri. = 251.75001 +/- 0.00018 Node = 181.71692 +/- 0.00006 (2000.0) Inc. = 31.51911 +/- 0.00002 q = 3.8433454 +/- 0.0000020 AU e = 0.3100204 +/- 0.0000029 a = 5.5702302 +/- 0.0000042 AU n' = 0.07497118 +/- 0.00000009 P = 13.146 +/- 0.0000150 years The predicted orbit for the 2012 return is as follows: T = 2012 Apr. 3.53342 TT Epoch = 2012 Apr. 23.0 TT Peri. = 247.67005 e = 0.2788930 Node = 180.77301 (2000.0) a = 5.5194954 AU Inc. = 32.48189 n'= 0.07600725 q = 3.9801468 AU P = 12.967 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1997/ 981115 372 1.3+ 0.4- 990121 046 1.3+ 0.3+ 971029 566 0.4+ 1.1+ 981115 360 0.3+ 0.1+ 990204 402 0.5- 0.6- 971029 566 1.1- 0.2- 981115 360 0.1+ 0.2+ 990204 402 1.2- 0.4- 971029 566 0.2- 0.8+ 981122 900 0.5+ 0.4+ 990204 402 0.4- 0.4- 971029 566 0.1+ 0.5+ 981122 900 1.1- 0.5+ 990214 360 0.1+ 0.7+ 971227 566 0.9+ 1.3+ 981123 372 0.5+ 0.2+ 990214 360 0.2- 0.9+ 1998/ 981123 360 0.3+ 0.8- 990216 071 0.3+ 1.0+ 981027 703 0.7- 0.4+ 981123 360 0.3+ 0.4- 990216 071 1.6+ 0.9+ 981027 703 1.0- 0.2+ 981126 402 0.4+ 0.2- 990216 071 1.6+ 0.4+ 981027 703 0.7- 0.8+ 981126 402 0.3+ 0.9- 990216 071 1.4+ 0.5+ 981028 703 0.5- 0.1- 981126 402 0.2+ 0.7- 990216 071 1.9+ 0.5+ 981028 703 0.1+ 0.4+ 981127 696 0.2- 0.5- 990216 071 1.8+ 1.0+ 981028 703 0.2- 0.0 981130 696 0.1- 1.0- 990216 071 1.4+ 0.9+ 981028 691 1.0- 1.2+ 981206 104 0.7- 0.2- 991109 402 1.0- 0.4- 981029 703 1.7- 0.4+ 981206 104 0.6+ 0.3+ 991109 402 0.9- 0.7- 981029 703 (2.3- 0.1-) 981209 761 (3.5+ 2.9-) 991109 402 0.8- 0.1+ 981029 713 0.6- 0.2+ 981209 761 (2.0+ 2.5-) 991109 402 0.3- 0.1+ 981029 703 0.6- 0.2+ 981209 113 0.4- 0.3- 991113 695 0.6- 1.0+ 981030 734 0.0 0.1- 981209 113 1.6- 0.9+ 991113 695 0.8- 0.8+ 981030 734 0.2+ 0.1- 981210 118 0.4+ 0.4- 991116 474(35.3+ 25.9+) 981030 734 0.2- 0.1+ 981210 118 0.1- 0.0 991116 474(34.2+ 30.0+) 981030 658 0.6- 0.5- 981212 402 0.1- 1.3- 991117 474 0.4- 1.9+ 981030 658 0.6- 0.5- 981212 402 0.2- 0.8- 991117 474 (0.7- 2.0+) 981030 587 0.9- 1.1- 981212 402 0.3- 1.2- 991117 474 (1.6- 2.4+) 981030 587 0.5- 0.6- 981213 897 0.1+ 0.1- 991203 360 0.0 0.3- 981031 402 0.4- 0.3+ 981213 897 0.2- 0.5- 991203 360 0.8- 0.0 981031 402 0.3+ 0.7+ 981213 897 1.4- 0.2- 991203 360 0.4- 0.2- 981103 402 1.4+ 0.4- 981217 360 0.1- 0.2+ 991220 897 0.3- 1.4- 981103 402 0.8+ 0.3- 981217 360 0.2+ 0.4+ 991220 897 (2.3- 0.0 ) 981103 402 0.5+ 0.3+ 981218 402 0.4- 1.1- 991220 897 (3.3- 0.3+) 981107 046 0.5- 0.5- 981218 402 0.1- 1.3- 991231 704 0.1+ 0.0 981107 046 0.5+ 0.2- 981218 402 0.6- 0.9- 991231 704 0.4- 0.1- 981107 046 0.0 0.3- 981224 402 0.4+ 0.0 991231 704 0.1- 0.5- 981107 046 0.4- 0.8- 981224 402 0.5+ 0.4+ 991231 704 0.1+ 0.1+ 981110 360 0.0 0.6- 981224 402 0.1- 0.3+ 2000/ 981110 360 0.1- 0.4- 1999/ 000104 402 0.5- 0.5- 981110 360 0.2- 0.4- 990105 402 1.2+ 1.2+ 000104 402 0.8+ 0.1+ 981111 355 0.5+ 0.3+ 990105 402 0.4+ 0.9+ 000118 402 1.1+ 1.3+ 981111 897 0.7- 0.6- 990105 402 0.9+ 0.2+ 000118 402 0.5+ 0.4+ 981111 355 0.4- 1.4+ 990113 372 1.0- 1.3+ 000118 402 0.6- 0.7- 981111 897 0.4- 0.6- 990114 691 0.2+ 0.0 000210 704 0.0 0.0 981111 897 0.1- 0.9- 990114 691 0.4+ 0.1- 000210 704 1.0+ 0.3- 981112 402 0.2- 0.5- 990114 691 0.0 0.1+ 000210 704 0.0 0.1+ 981112 402 0.1+ 0.8- 990118 402 1.1+ 1.4+ 2001/ 981112 402 0.0 0.6- 990118 402 1.0+ 0.6+ 010217 608 0.5+ 0.1- 981112 360 0.6+ 1.0- 990118 402 0.4+ 1.3+ 010217 608 1.3+ 0.3- 981112 372 1.3- 0.3- 990121 360 0.0 0.1- 010217 608 0.1- 0.3+ 981112 360 0.3+ 0.6- 990121 360 0.3+ 0.2+ 010415 608 0.1+ 0.1- 981112 360 0.1+ 0.5- 990121 046 0.5+ 1.3+ 981114 372 0.5- 0.2+ 990121 046 0.8+ 0.3+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2008 Sept. 2

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