OAA computing section circular NK 736 P/1999 XN120 (Catalina)

The following improved orbital elements, by S. Nakano, are from 72 observations 1999 Nov. 3 to 2000 Mar. 30. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.64 arc second. Epoch = 2000 May 16.0 TT T = 2000 May 1.56580 +/- 0.06697 (m.e.) TT Peri. = 161.82948 +/- 0.01267 Node = 285.45449 +/- 0.00097 (2000.0) Inc. = 5.03086 +/- 0.00010 q = 3.2862613 +/- 0.0000517 AU e = 0.2131993 +/- 0.0000344 a = 4.1767391 +/- 0.0000464 AU n' = 0.11546438 +/- 0.00000193 P = 8.536 +/- 0.0001423 years (+/- 0.05 day) The predicted orbit for the 2008 return is as follows: T = 2008 Nov. 12.63254 TT Epoch = 2008 Nov. 30.0 TT Peri. = 161.61584 e = 0.2108560 Node = 285.44787 (2000.0) a = 4.1869075 AU Inc. = 5.02635 n'= 0.11504401 q = 3.3040727 AU P = 8.567 years The following residuals in seconds of arc are from the above orbital elements: 1999/ 991210 704 0.1+ 0.6+ 000228 118 0.3- 0.2+ 991103 704 0.7+ 0.1+ 991213 703 0.1- 0.0 000301 402 0.0 1.0+ 991103 704 1.1+ 0.5- 991213 703 1.5- 1.5- 000301 402 0.3+ 0.2- 991103 704 0.5+ 0.4- 991213 703 0.3- 1.0- 000301 402 0.7+ 0.1- 991103 704 0.7+ 0.1+ 991213 703 1.0+ 0.5+ 000301 360 0.6- 0.3- 991109 703 0.7- 0.8+ 991215 704 1.1+ 0.4- 000301 360 0.6- 0.1- 991109 703 0.5- 0.9+ 991215 704 0.5+ 0.6- 000302 118 0.4- 0.3+ 991109 703 0.6- 0.3- 991215 704 1.1- 0.9+ 000302 118 0.3- 0.6+ 991109 703 1.9- 0.6+ 991215 704 0.7+ 0.8- 000304 704 0.2- 0.1+ 991112 699 0.9- 0.9- 2000/ 000304 704 0.2- 0.6- 991112 699 0.2+ 0.3- 000130 704 0.7- 0.5+ 000304 704 0.3+ 0.1- 991112 699 0.6+ 0.2+ 000130 704 0.2- 0.1- 000304 703 0.2+ 1.6+ 991116 704 0.2- 0.2+ 000130 704 0.4+ 0.0 000304 704 0.9+ 0.6- 991116 704 0.1- 0.5- 000130 704 0.3+ 0.3- 000304 703 0.3- 0.9+ 991116 704 0.7+ 1.2- 000130 704 1.0+ 0.2+ 000304 703 0.1- 0.3+ 991116 704 1.1+ 0.6- 000203 704 (1.3- 2.5-) 000304 703 0.4+ 0.1- 991116 704 0.3+ 0.2+ 000203 704 (1.0+ 2.1-) 000309 360 0.1- 0.1- 991119 699 0.6- 1.0+ 000203 704 0.7+ 1.5- 000309 360 0.3- 0.0 991119 699 0.9+ 0.4- 000203 704 (1.7+ 2.6-) 000309 360 0.4- 0.1+ 991119 699 1.5- 0.5+ 000204 118 0.3+ 0.1+ 000317 118 0.4+ 0.8+ 991205 703 0.7- 1.3+ 000204 118 0.1- 0.7+ 000317 118 0.1+ 0.4+ 991205 703 0.9- 0.4+ 000204 118 0.7- 0.2+ 000318 118 0.3+ 1.1- 991205 703 0.6+ 0.3+ 000227 693 0.2- 0.3- 000318 118 0.3+ 1.1- 991205 703 0.1- 0.3+ 000227 693 0.4- 0.3- 000330 360 0.2+ 0.4- 991210 704 1.3+ 0.2+ 000227 693 0.4- 0.3- 000330 360 0.0 0.4- 991210 704 0.3- 0.0 000228 118 0.3- 0.3+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2000 Nov. 3

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