OAA computing section circular NK 854 P/1998 W2 (Hergenrother)
The following improved orbital elements, by S. Nakano, are from 65 observations 1998 Nov. 21 to 1999 Apr. 15. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.63 arc second. Epoch = 1998 Dec. 13.0 TT T = 1998 Dec. 5.94743 +/- 0.00095 (m.e.) TT Peri. = 13.88939 +/- 0.00074 Node = 356.50199 +/- 0.00031 (2000.0) Inc. = 21.92928 +/- 0.00007 q = 1.4202019 +/- 0.0000065 AU e = 0.6084328 +/- 0.0000276 a = 3.6269689 +/- 0.0000706 AU n' = 0.14268829 +/- 0.00000416 P = 6.907 +/- 0.0002016 years (+/- 0.07 day) The predicted orbit for the 2005 return is as follows: T = 2005 Nov. 2.17239 TT Epoch = 2005 Nov. 6.0 TT Peri. = 13.88004 e = 0.6074804 Node = 356.50300 (2000.0) a = 3.6323519 AU Inc. = 21.89383 n'= 0.14237122 q = 1.4257692 AU P = 6.923 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1998/ 981125 402 1.0- 0.9- 1999/ 981121 703 0.2+ 1.1+ 981125 402 0.1- 0.4- 990105 402 0.3- 0.0 981121 703 (2.6+ 1.8+) 981128 402 0.7+ 0.6+ 990105 402 (2.1+ 0.1+) 981122 703 (4.4+ 0.9-) 981128 402 1.2+ 0.1+ 990105 402 0.1- 0.7+ 981122 703 (4.4+ 1.0-) 981128 402 0.3- 0.9- 990113 360 0.2- 0.4+ 981122 703 0.4+ 0.5+ 981128 426 1.8+ 1.1- 990113 360 0.7- 0.2- 981123 693 0.2- 0.3+ 981128 426 1.0+ 1.0- 990113 360 0.7+ 0.4+ 981123 693 0.7- 0.2+ 981128 426 0.1+ 0.1+ 990114 693 0.4- 0.2+ 981123 693 0.6- 0.0 981213 693 1.0- 0.2+ 990114 693 0.6- 0.0 981123 693 0.3- 0.4+ 981213 693 1.2- 0.1- 990114 693 0.2- 0.0 981123 691 0.0 0.1- 981216 402 (2.3+ 1.2+) 990115 693 0.5+ 1.2- 981123 691 0.0 0.6+ 981216 402 0.6+ 0.3- 990115 693 0.8+ 0.5- 981123 360 0.2- 0.2- 981216 402 0.6- 0.5+ 990115 693 0.5+ 0.6- 981123 360 0.5- 0.0 981216 402 1.0- 0.8- 990213 693 0.3- 1.3+ 981123 360 0.3+ 0.1- 981217 402 0.7+ 0.5+ 990213 693 0.1+ 0.6+ 981124 691 0.2- 0.1+ 981217 402 0.6+ 0.2- 990213 693 0.2- 0.1+ 981124 691 0.6- 0.2- 981217 402 0.1- 1.8- 990214 693 0.5- 0.5- 981124 691 0.0 0.5+ 981219 691 0.5- 0.1- 990214 693 0.1- 0.5+ 981124 709 0.6+ 0.2+ 981219 691 0.9- 0.6- 990214 693 0.0 0.1+ 981124 709 0.1- 0.2+ 981223 402 (2.4+ 0.2+) 990412 693 1.1- 0.3+ 981124 709 0.4+ 0.3+ 981223 402 1.0+ 1.1- 990412 693 0.7- 0.1- 981124 709 0.9- 0.1- 981223 402 (2.2+ 0.6+) 990415 693 0.3+ 0.3- 981124 709 0.1+ 0.2+ 981223 402 (2.6+ 0.2-) 990415 693 0.9+ 0.1+ 981124 426 0.3- 1.0+ 981223 118 1.0+ 0.6+ 990415 693 0.6+ 0.1+ 981124 426 0.7- 0.2+ 981223 118 0.8+ 0.1- 981125 402 (0.2- 3.2-) 981223 118 1.7+ 1.1+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2002 May 8