OAA computing section circular NK 881 P/2002 A1 (LINEAR)

The following improved orbital elements, by S. Nakano, are from 62 observations 2001 Dec. 13 to 2002 Feb. 6. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.56 arc second. See an orbit of P/2002 A2 in NK882. Epoch = 2001 Nov. 27.0 TT T = 2001 Dec. 3.00104 +/- 0.50524 (m.e.) TT Peri. = 19.18522 +/- 0.07156 Node = 82.19135 +/- 0.01046 (2000.0) Inc. = 14.23189 +/- 0.00688 q = 4.7119640 +/- 0.0010882 AU e = 0.7411569 +/- 0.0001447 a = 18.2039396 +/- 0.0006050 AU n' = 0.01268984 +/- 0.00000063 P = 77.669 +/- 0.0038719 years (+/- 1.41 day) The predicted orbit for the 2066 return is as follows: T = 2066 Apr. 13.00141 TT Epoch = 2066 Apr. 20.0 TT Peri. = 19.02193 e = 0.7068438 Node = 81.00062 (2000.0) a = 15.9712265 AU Inc. = 14.03170 n'= 0.01544176 q = 4.6820634 AU P = 63.827 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2001/ 020109 621 0.4- 0.3- 020116 046 0.1- 0.5- 011213 704 0.2+ 0.2+ 020109 621 0.5- 0.5- 020116 046 0.2+ 0.1+ 011213 704 0.2- 0.0 020110 046 0.1+ 0.2- 020116 046 1.3+ 0.3+ 011213 704 1.1- 0.7- 020110 046 0.4- 0.1+ 020116 170 (0.6+ 2.0+) 011213 704 0.2+ 0.9+ 020110 046 0.1+ 0.3+ 020116 170 1.6- 1.3+ 011217 704 1.3+ 0.3+ 020110 046 0.7- 0.2- 020118 966 0.2+ 0.3+ 011217 704 0.2+ 0.1- 020111 696 0.1+ 0.1- 020118 966 0.3+ 0.1- 011217 704 0.0 0.1- 020111 696 0.6+ 0.6+ 020118 966 1.2+ 0.4+ 011217 704 (3.2- 0.2-) 020111 413 0.0 0.1+ 020118 587 0.5- 0.7+ 2002/ 020111 413 0.4+ 0.0 020118 587 0.1- 0.7+ 020108 704 0.2- 0.7+ 020111 413 0.0 0.2- 020118 170 1.7+ 0.7+ 020108 704 0.4- 0.2+ 020111 413 0.2+ 0.2- 020118 170 0.4- 0.4+ 020108 704 1.0- 0.6- 020112 204 0.2- 0.8+ 020119 341 0.0 0.1- 020108 704 0.8+ 1.0+ 020112 204 (2.2- 6.9+) 020119 341 0.7+ 0.1+ 020108 704 0.8+ 0.5+ 020113 204 0.6- 1.1- 020119 341 0.1- 0.3- 020109 046 0.0 0.2- 020113 360 0.2+ 1.0- 020201 402 0.9- 0.1+ 020109 046 0.2+ 0.2+ 020113 360 0.1+ 0.7- 020201 402 1.1- 1.1- 020109 046 0.1- 0.3- 020113 372 0.5- 0.4- 020201 402 0.2- 0.4+ 020109 046 0.2- 0.0 020113 372 0.4+ 0.2+ 020206 360 0.3+ 0.1+ 020109 046 0.3- 0.2- 020114 966 1.1- 0.5- 020206 360 0.2+ 0.2- 020109 046 0.2+ 0.1+ 020114 170 0.4- 0.5- 020206 360 1.0+ 0.7+ 020109 621 0.2- 0.3- 020114 170 0.5+ 0.6- 020109 621 0.0 0.0 020116 046 0.3- 1.0- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2002 Oct. 31

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