OAA computing section circular NK 756 P/1998 U4 (Spahr)

The following improved orbital elements, by S. Nakano, are from 127 observations 1998 Oct. 27 to 2000 Feb. 10. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.69 arc second. Epoch = 1999 Mar. 3.0 TT T = 1999 Feb. 26.47586 +/- 0.01682 (m.e.) TT Peri. = 251.74458 +/- 0.00254 Node = 181.71715 +/- 0.00016 (2000.0) Inc. = 31.51912 +/- 0.00003 q = 3.8433306 +/- 0.0000165 AU e = 0.3100416 +/- 0.0000082 a = 5.5703803 +/- 0.0000126 AU n' = 0.07496815 +/- 0.00000026 P = 13.147 +/- 0.0000448 years (+/- 0.02 day) The predicted orbit for the 2012 return is as follows: T = 2012 Apr. 3.25623 TT Epoch = 2012 Apr. 23.0 TT Peri. = 247.60519 e = 0.2790544 Node = 180.77283 (2000.0) a = 5.5217227 AU Inc. = 32.47783 n'= 0.07596126 q = 3.9808618 AU P = 12.975 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1998/ 981115 360 0.3+ 0.2+ 990121 046 0.2+ 1.3+ 981027 703 0.4- 0.4+ 981122 900 0.6+ 0.5+ 990121 046 0.5+ 0.4+ 981027 703 0.8- 0.1+ 981122 900 1.0- 0.6+ 990121 046 1.0+ 0.4+ 981027 703 0.4- 0.8+ 981123 372 0.6+ 0.3+ 990204 402 0.9- 0.5- 981028 703 0.3- 0.2- 981123 360 0.5+ 0.7- 990204 402 1.6- 0.4- 981028 703 0.3+ 0.3+ 981123 360 0.4+ 0.3- 990204 402 0.8- 0.3- 981028 703 0.0 0.0 981126 402 0.5+ 0.1- 990214 360 0.5- 0.8+ 981028 691 1.8- 1.1+ 981126 402 0.4+ 0.8- 990214 360 0.7- 0.9+ 981029 703 1.4- 0.3+ 981126 402 0.3+ 0.6- 990216 071 0.2- 1.0+ 981029 703 (2.1- 0.2-) 981127 696 0.1- 0.4- 990216 071 1.1+ 1.0+ 981029 713 0.4- 0.2+ 981130 696 0.0 0.9- 990216 071 1.0+ 0.4+ 981029 703 0.4- 0.2+ 981206 104 0.6- 0.1- 990216 071 0.8+ 0.5+ 981030 734 0.2+ 0.2- 981206 104 0.6+ 0.4+ 990216 071 1.4+ 0.5+ 981030 734 0.4+ 0.2- 981209 761 (3.5+ 2.8-) 990216 071 1.2+ 1.0+ 981030 734 0.0 0.0 981209 761 (2.0+ 2.4-) 990216 071 0.9+ 0.9+ 981030 658 0.4- 0.5- 981209 113 0.4- 0.2- 991109 402 0.9- 0.4- 981030 658 0.4- 0.5- 981209 113 1.6- 1.0+ 991109 402 0.8- 0.7- 981030 587 0.6- 1.1- 981210 118 0.5+ 0.3- 991109 402 0.7- 0.0 981030 587 0.3- 0.7- 981210 118 0.0 0.1+ 991109 402 0.2- 0.0 981031 402 0.1- 0.3+ 981212 402 0.1- 1.2- 991113 695 0.5- 0.9+ 981031 402 0.5+ 0.7+ 981212 402 0.2- 0.6- 991113 695 0.6- 0.7+ 981103 402 1.6+ 0.4- 981212 402 0.3- 1.1- 991116 474(35.4+ 25.8+) 981103 402 1.0+ 0.4- 981213 897 0.1+ 0.0 991116 474(34.4+ 29.9+) 981103 402 0.7+ 0.3+ 981213 897 0.2- 0.3- 991117 474 0.3- 1.8+ 981107 046 0.3- 0.5- 981213 897 1.4- 0.1- 991117 474 0.5- 1.9+ 981107 046 0.7+ 0.1- 981217 360 0.1- 0.3+ 991117 474 (1.4- 2.3+) 981107 046 0.2+ 0.3- 981217 360 0.2+ 0.5+ 991203 360 0.3+ 0.5- 981107 046 0.2- 0.8- 981218 402 0.4- 1.0- 991203 360 0.5- 0.2- 981110 360 0.2+ 0.5- 981218 402 0.1- 1.2- 991203 360 0.1- 0.4- 981110 360 0.1+ 0.4- 981218 402 0.6- 0.7- 991220 897 0.1+ 1.7- 981110 360 0.0 0.3- 981224 402 0.3+ 0.1+ 991220 897 1.9- 0.3- 981111 355 0.7+ 0.3+ 981224 402 0.5+ 0.5+ 991220 897 (2.9- 0.0 ) 981111 897 0.5- 0.6- 981224 402 0.1- 0.4+ 991231 704 0.5+ 0.3- 981111 355 0.2- 1.5+ 1999/ 991231 704 0.0 0.5- 981111 897 0.2- 0.6- 990105 402 1.1+ 1.3+ 991231 704 0.2+ 0.8- 981111 897 0.1+ 0.8- 990105 402 0.2+ 1.0+ 991231 704 0.4+ 0.2- 981112 402 0.0 0.5- 990105 402 0.7+ 0.2+ 2000/ 981112 402 0.3+ 0.7- 990113 372 1.2- 1.4+ 000104 402 0.2- 0.8- 981112 402 0.2+ 0.6- 990114 691 1.0- 0.0 000104 402 1.1+ 0.2- 981112 360 0.8+ 0.9- 990114 691 0.9- 0.0 000118 402 1.4+ 1.0+ 981112 372 1.1- 0.2- 990114 691 1.2- 0.2+ 000118 402 0.8+ 0.1+ 981112 360 0.5+ 0.6- 990118 402 0.9+ 1.4+ 000118 402 0.3- 0.9- 981112 360 0.3+ 0.5- 990118 402 0.7+ 0.7+ 000210 704 0.2+ 0.1- 981114 372 0.4- 0.2+ 990118 402 0.1+ 1.4+ 000210 704 1.2+ 0.5- 981115 372 1.4+ 0.4- 990121 360 0.3- 0.1- 000210 704 0.2+ 0.1- 981115 360 0.5+ 0.1+ 990121 360 0.0 0.2+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2000 Dec. 21

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