OAA computing section circular NK 815 P/2000 S4 (LINEAR-Spacewatch)

The following improved orbital elements, by S. Nakano, are from 37 observations 2000 Sept. 1 to Nov. 21. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.76 arc second. Epoch = 2000 Oct. 23.0 TT T = 2000 Oct. 19.08388 +/- 0.00661 (m.e.) TT Peri. = 172.31859 +/- 0.00258 Node = 174.64483 +/- 0.00077 (2000.0) Inc. = 28.32624 +/- 0.00052 q = 2.2654186 +/- 0.0004624 AU e = 0.6818523 +/- 0.0000443 a = 7.1206516 +/- 0.0002471 AU n' = 0.05187098 +/- 0.00000270 P = 19.001 +/- 0.0009890 years (+/- 0.36 day) The predicted orbit for the 2019 return is as follows: T = 2019 Sept.23.11812 TT Epoch = 2019 Oct. 4.0 TT Peri. = 173.08650 e = 0.6813288 Node = 173.79907 (2000.0) a = 7.1088734 AU Inc. = 28.37762 n'= 0.05199995 q = 2.2653930 AU P = 18.954 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2000/ 001002 691 0.3- 0.0 001007 691 0.2- 0.9- 000901 704 0.6- 0.5+ 001002 691 0.2- 0.8- 001007 691 0.1+ 0.6- 000901 704 0.1- 1.0- 001002 691 0.2- 0.3- 001007 691 0.2+ 0.4- 000901 704 0.5+ 0.0 001003 691 1.0- 0.8- 001021 691 (2.7- 0.6-) 000901 704 0.4+ 0.0 001003 691 0.4+ 0.1- 001021 691 0.9- 0.1- 000901 704 0.3- 0.6- 001003 691 0.3- 0.4- 001021 691 0.7- 0.2+ 000923 704 0.7+ 0.2+ 001003 691 0.1- 0.3+ 001029 691 1.2+ 1.7- 000923 704 0.3+ 1.8+ 001003 691 0.2- 0.9- 001029 691 1.1+ 1.6+ 000923 704 0.6+ 0.3- 001003 691 0.4+ 0.1+ 001029 691 (2.7+ 0.3-) 000923 704 0.4- 1.1+ 001004 691 0.2+ 0.1+ 001121 691 0.1+ 1.9- 000926 704 0.0 0.2- 001004 691 0.2+ 0.1+ 001121 691 (2.7+ 2.0+) 000926 704 0.7- 1.2+ 001004 691 0.5+ 0.3- 001121 691 1.2- 0.6+ 000926 704 (1.7+ 2.4+) 001004 691 0.2+ 0.3- 001121 691 1.6- 0.3+ 000926 704 0.1- 1.7+ 001004 691 0.1+ 0.2+ 001121 691 1.9+ 1.5+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2000 Oct. 30

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