OAA computing section circular NK 820 P/2001 H5 (NEAT)
The following improved orbital elements, by S. Nakano, are from 43 observations 2001 Mar. 20 to June 26. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.55 arc second. Epoch = 2001 Jan. 11.0 TT T = 2001 Jan. 28.69489 +/- 0.01671 (m.e.) TT Peri. = 224.87423 +/- 0.00774 Node = 329.56562 +/- 0.00159 (2000.0) Inc. = 8.39954 +/- 0.00012 q = 2.3966468 +/- 0.0000736 AU e = 0.6000307 +/- 0.0000480 a = 5.9920774 +/- 0.0001239 AU n' = 0.06719515 +/- 0.00000208 P = 14.668 +/- 0.0004548 years (+/- 0.17 day) The predicted orbit for the 2015 return is as follows: T = 2015 Oct. 21.76184 TT Epoch = 2015 Oct. 25.0 TT Peri. = 224.73280 e = 0.6003076 Node = 328.69393 (2000.0) a = 6.0939177 AU Inc. = 8.38149 n'= 0.06551778 q = 2.4356923 AU P = 15.043 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2001/ 010424 046 0.4- 0.3+ 010512 360 0.6+ 0.7- 010320 704 0.4- 0.8- 010425 808 0.5+ 1.8+ 010513 402 0.1+ 0.4+ 010320 704 0.3+ 0.6- 010425 808 0.2- 1.9+ 010513 402 0.7- 1.2+ 010320 704 0.6- 0.0 010425 926 1.4+ 0.3- 010513 402 0.1+ 0.1+ 010320 704 1.3+ 0.7- 010425 926 0.0 0.3- 010514 428 0.8- 0.4+ 010320 704 0.3- 0.8+ 010425 428 0.2+ 0.5+ 010514 428 0.4- 0.4- 010424 644 0.5- 0.2+ 010425 428 0.2+ 0.1+ 010519 360 0.0 1.0- 010424 644 0.1- 0.0 010426 360 0.4+ 0.1+ 010519 360 0.4- 0.3- 010424 644 0.0 0.0 010426 360 0.0 0.4- 010523 118 0.0 0.8- 010424 046 0.4+ 0.5- 010427 428 0.1- 0.1+ 010523 118 0.4- 1.0- 010424 046 0.7+ 0.4- 010427 428 0.3- 0.0 010526 428 0.0 0.3+ 010424 046 0.2- 0.2- 010427 428 0.5- 0.1+ 010526 428 0.5- 0.1- 010424 046 0.2- 0.1+ 010502 428 0.4- 0.1- 010626 413 0.8+ 0.2+ 010424 046 0.0 0.3+ 010502 428 0.4- 0.3- 010626 413 0.3+ 0.2+ 010424 046 0.1- 0.1- 010512 360 0.8+ 0.5- ( ) -------- Rejected Obs.
Director, Computing Section Late edition Syuichi Nakano 2001 Nov. 3