OAA computing section circular NK 733 P/1999 X1 (Hug-Bell)
The following improved orbital elements, by S. Nakano, are from 86 observations 1999 Oct. 10 to 2000 Feb. 7. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.77 arc second. Epoch = 1999 July 1.0 TT T = 1999 June 20.83652 +/- 0.00426 (m.e.) TT Peri. = 296.91694 +/- 0.00100 Node = 103.65121 +/- 0.00019 (2000.0) Inc. = 10.96889 +/- 0.00021 q = 1.9367730 +/- 0.0000423 AU e = 0.4727672 +/- 0.0000451 a = 3.6734684 +/- 0.0000883 AU n' = 0.13998762 +/- 0.00000505 P = 7.041 +/- 0.0002539 years (+/- 0.09 day) The predicted orbit for the 2006 return is as follows: T = 2006 July 6.68051 TT Epoch = 2006 July 4.0 TT Peri. = 296.87453 e = 0.4709808 Node = 103.64824 (2000.0) a = 3.6804007 AU Inc. = 10.96304 n'= 0.13959229 q = 1.9470026 AU P = 7.061 years The following residuals in seconds of arc are from the above orbital elements: 1999/ 991215 360 1.3+ 0.2+ 000104 360 0.1+ 0.1- 991010 704 0.1- 0.6+ 991215 360 1.4+ 0.1- 000104 402 0.6+ 0.4- 991010 704 0.3+ 0.3+ 991215 897 1.0- 0.2+ 000104 402 0.2+ 0.2- 991010 704 0.1- 0.7+ 991215 897 0.6- 0.2+ 000104 897 0.8- 0.1+ 991207 704 1.1+ 1.7- 991215 897 (2.3- 0.4-) 000104 402 0.6+ 0.6- 991207 704 0.2+ 0.0 991217 046 0.9+ 0.3- 000104 897 0.4- 0.9- 991207 704 0.1+ 0.7+ 991217 046 0.8- 0.5+ 000105 587 0.1- 0.1+ 991210 734 0.6+ 0.4- 991217 046 0.3- 1.1- 000105 587 0.0 0.2+ 991210 734 0.9+ 0.7- 991217 734 (2.1+ 2.5-) 000106 587 1.2- 0.3- 991210 734 0.1- 0.3- 991217 734 1.1- 0.6- 000107 734 0.1- 1.2- 991210 734 0.3- 0.4- 991217 734 1.2+ 0.4- 000107 734 1.4- 1.1+ 991210 734 0.4+ 0.7- 991217 734 0.6- 0.7- 000107 734 0.6+ 0.6- 991210 734 0.6+ 0.2+ 991219 411 0.1+ 0.1- 000107 734 0.6- 0.6- 991210 734 0.2- 0.1+ 991219 411 1.2+ 1.3+ 000107 587 0.9+ 1.0+ 991210 734 0.3+ 0.2- 991219 411 0.2+ 0.8+ 000107 587 1.5+ 0.1- 991211 557 0.3+ 0.6+ 991226 734 0.4+ 1.9- 000107 587 1.4+ 0.2- 991211 557 0.4+ 0.2+ 991226 734 0.6- 1.8- 000111 695 0.7+ 0.4- 991211 557 0.5+ 0.4+ 991226 734 1.2- 1.9+ 000111 695 (1.1+ 2.5-) 991211 734 0.0 0.6- 991226 734 0.8- 1.7- 000111 695 0.4+ 0.2+ 991211 734 1.5- 0.5+ 991229 402 0.1- 1.1+ 000111 695 0.4+ 0.2- 991211 734 0.1+ 0.5- 991229 402 0.1+ 1.2+ 000116 734 0.6+ 0.1- 991211 734 0.2- 1.5- 991229 402 (1.2- 2.1+) 000116 734 1.8- 0.6+ 991211 734 1.6- 0.5+ 991231 734 (2.1- 0.2+) 000126 402 0.7+ 0.5+ 991211 118 0.1- 0.5- 991231 734 1.5- 0.8+ 000126 402 0.2+ 1.4+ 991211 118 1.0- 0.7+ 2000/ 000126 402 0.3+ 0.3- 991211 118 0.4+ 0.7+ 000103 897 (2.7- 1.9+) 000128 360 0.6+ 0.4+ 991213 734 0.6+ 0.3- 000103 897 1.6- 0.7- 000128 360 0.1- 0.1+ 991213 734 0.8+ 0.6- 000103 897 1.2- 1.0+ 000128 360 0.5+ 0.3- 991213 734 0.1+ 0.4- 000103 372 (5.4- 1.7+) 000207 734 0.3+ 1.1- 991215 372 0.9- 1.0+ 000104 360 0.5+ 0.3+ 000207 734 0.1- 0.0 991215 372 1.2- 1.1+ 000104 897 1.0- 1.0+ 000207 734 0.2- 0.9+ 991215 360 1.0+ 0.6+ 000104 360 0.3+ 0.5+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2000 Nov. 2