OAA computing section circular NK 802 P/2001 J1 (NEAT)
The following improved orbital elements, by S. Nakano, are from 55 observations 2000 Oct. 7 to 2001 May 27. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.86 arc second. Epoch = 2001 Apr. 1.0 TT T = 2001 Mar. 14.10555 +/- 0.00059 (m.e.) TT Peri. = 271.02538 +/- 0.00103 Node = 200.79540 +/- 0.00135 (2000.0) Inc. = 10.15958 +/- 0.00061 q = 0.9370699 +/- 0.0000072 AU e = 0.7583227 +/- 0.0000388 a = 3.8773597 +/- 0.0001609 AU n' = 0.12909218 +/- 0.00000803 P = 7.635 +/- 0.0004751 years (+/- 0.17 day) The predicted orbit for the 2008 return is as follows: T = 2008 Nov. 6.79565 TT Epoch = 2008 Oct. 21.0 TT Peri. = 271.17649 e = 0.7571733 Node = 200.67046 (2000.0) a = 3.8881551 AU Inc. = 10.15188 n'= 0.12855492 q = 0.9441478 AU P = 7.667 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2000/ 010513 734 1.0+ 0.9- 010516 046 (2.5- 0.4+) 001007 691 0.2- 0.4- 010513 734 0.0 1.0- 010516 046 1.5+ 0.6+ 001007 691 0.1+ 0.2+ 010513 734 (0.8- 2.3-) 010517 926 (1.3+ 2.0-) 001007 691 0.1+ 0.1+ 010513 118 1.1+ 1.3- 010517 926 1.8- 1.4- 2001/ 010513 118 1.5+ 0.6+ 010517 926 1.2- 1.8+ 010511 608 0.4- 0.6+ 010513 118 0.3+ 0.3- 010517 926 0.3- 0.6+ 010511 608 0.3- 0.5+ 010513 046 0.3+ 1.0+ 010517 926 0.4+ 0.9+ 010511 608 0.8- 0.2- 010513 046 (0.1- 2.2+) 010517 867 0.5- 0.1+ 010511 557 (2.0+ 0.8-) 010513 046 (0.9+ 2.6+) 010517 867 1.0- 0.2+ 010511 557 0.8+ 0.7- 010513 046 (2.2- 2.2+) 010517 867 0.9+ 0.4- 010511 557 1.3- 0.4- 010513 046 (4.7+ 2.6+) 010517 402 (7.6+ 2.9-) 010511 046 (3.6- 3.0+) 010514 649 0.0 0.1+ 010517 402 (1.2- 2.8-) 010511 046 (3.4- 1.6+) 010514 649 1.4+ 0.2- 010517 402 1.9- 0.9- 010511 046 1.7- 1.3- 010514 649 0.4+ 0.0 010517 402 0.5- 0.4+ 010511 046 0.1+ 1.3- 010515 926 1.3- 1.4+ 010519 360 0.6- 0.7- 010511 046 0.6+ 1.2- 010515 926 (0.9- 2.1+) 010519 360 0.5- 0.3- 010512 649 0.1- 0.3+ 010515 926 1.4- 1.2+ 010519 360 1.0- 1.0- 010512 649 0.9+ 0.3+ 010515 926 0.6- 1.0+ 010519 300 0.4+ 0.5+ 010512 046 1.4+ 0.4- 010515 926 1.5- 1.4+ 010519 300 (2.9+ 3.8-) 010512 046 0.5- 0.6+ 010516 360 0.3- 0.6+ 010519 046 (1.2+ 2.6-) 010512 046 (2.0- 0.3+) 010516 360 0.8+ 0.9+ 010519 046 (1.3+ 2.3-) 010512 046 0.3+ 0.1+ 010516 360 1.0+ 0.0 010519 046 0.0 0.6- 010512 118 (3.1- 0.4+) 010516 046 (0.3- 2.1+) 010519 046 1.1+ 0.6- 010512 201 (2.3+ 1.0-) 010516 046 1.8+ 0.3- 010527 290 0.0 0.5- 010512 118 0.4- 1.2- 010516 046 1.0+ 1.7+ 010527 290 0.4+ 0.4- 010512 201 (6.1+ 1.5+) 010516 046 0.5+ 0.3+ 010527 290 0.0 0.5- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2001 July 2