OAA computing section circular NK 734 P/1999 XB69 (LINEAR)

The following improved orbital elements, by S. Nakano, are from 57 observations 1999 Nov. 14 to 2000 May 1. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.52 arc second. Epoch = 2000 Feb. 26.0 TT T = 2000 Feb. 17.03896 +/- 0.00051 (m.e.) TT Peri. = 220.18092 +/- 0.00029 Node = 256.16672 +/- 0.00006 (2000.0) Inc. = 11.33642 +/- 0.00004 q = 1.6392616 +/- 0.0000031 AU e = 0.6319763 +/- 0.0000074 a = 4.4542282 +/- 0.0000202 AU n' = 0.10484443 +/- 0.00000071 P = 9.401 +/- 0.0000639 years (+/- 0.02 day) The predicted orbit for the 2009 return is as follows: T = 2009 July 25.90778 TT Epoch = 2009 July 28.0 TT Peri. = 220.32572 e = 0.6307853 Node = 256.05288 (2000.0) a = 4.4746953 AU Inc. = 11.30583 n'= 0.10412592 q = 1.6521233 AU P = 9.466 years The following residuals in seconds of arc are from the above orbital elements: 1999/ 000105 704 0.2- 0.1+ 000203 402 (8.9+ 8.4+) 991114 704 0.8+ 0.4+ 000105 704 0.0 1.0- 000226 413 0.0 0.3- 991114 704 0.5+ 0.7+ 000105 704 0.4- 0.3- 000226 413 0.1- 0.2- 991114 704 0.5- 0.8+ 000105 704 0.8- 0.7- 000227 693 0.2- 0.4- 991114 704 0.0 0.4+ 000106 704 0.2- 0.5+ 000227 693 0.2- 0.3- 991116 704 0.2+ 0.7- 000106 704 0.2- 0.1+ 000301 402 1.3+ 0.2+ 991116 704 0.1- 1.1- 000106 704 0.4- 0.1+ 000301 402 0.2+ 0.2- 991116 704 0.3- 0.4- 000106 704 0.5- 0.2+ 000301 402 0.2- 1.9- 991116 704 0.0 1.9- 000106 704 0.1- 0.2- 000301 360 0.3+ 0.3+ 991207 704 0.3+ 0.0 000113 046 0.9+ 0.0 000301 360 0.1+ 0.3+ 991207 704 0.3- 0.5+ 000113 046 0.1- 0.2- 000301 360 0.1- 0.4+ 991207 704 0.0 0.2- 000113 046 0.5- 0.3+ 000330 360 0.3- 0.3+ 991207 704 0.3+ 0.5+ 000113 046 1.3+ 1.0+ 000330 360 0.3+ 0.0 991207 704 0.2+ 0.2- 000113 046 0.3+ 0.4+ 000424 360 0.3- 0.2- 991208 704 0.0 0.1- 000113 046 0.6- 0.6+ 000424 360 0.6- 0.3- 991208 704 0.2- 0.3+ 000113 046 0.2- 0.3+ 000424 360 0.9- 1.1- 991208 704 0.1+ 0.1+ 000113 046 0.2- 0.3- 000501 695 0.8+ 0.7+ 991208 704 0.0 0.3+ 000113 046 0.0 0.1- 000501 695 0.7+ 0.5+ 991208 704 0.0 0.4+ 000113 046 0.2+ 0.3+ 000501 695 0.3- 0.9+ 2000/ 000113 046 0.2+ 0.0 000105 704 0.1+ 0.2- 000203 402 (8.9+ 3.4+) ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2000 Nov. 3

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