OAA computing section circular NK 940 80P/Peters-Hartley
The following improved orbital elements, by S. Nakano, are from 36 observations 1982 to 1998, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 1.04 arc seconds. Epoch = 1998 Aug. 15.0 TT T = 1998 Aug. 11.63793 +/- 0.00351 (m.e.) TT Peri. = 338.40331 +/- 0.00134 Node = 260.00650 +/- 0.00015 (2000.0) Inc. = 29.85517 +/- 0.00014 q = 1.6239379 +/- 0.0000059 AU e = 0.5980064 +/- 0.0000040 a = 4.0397107 +/- 0.0000107 AU n' = 0.12138882 +/- 0.00000048 P = 8.119 +/- 0.0000322 years A1 = +0.677 +/- 0.296 A2 = -0.07676 +/- 0.00141 T = 1982 May 8.57066 TT Epoch = 1982 Apr. 21.0 TT Peri. = 338.18703 e = 0.5983776 Node = 260.05987 (2000.0) a = 4.0400951 AU Inc. = 29.85440 n'= 0.12137149 q = 1.6225927 AU P = 8.121 years T = 1990 June 23.63574 TT Epoch = 1990 July 8.0 TT Peri. = 338.30093 e = 0.5979180 Node = 260.10408 (2000.0) a = 4.0433476 AU Inc. = 29.83387 n'= 0.12122507 q = 1.6257575 AU P = 8.130 years The predicted orbit for the 2006 return is as follows: T = 2006 Sept.25.82017 TT Epoch = 2006 Sept.22.0 TT Peri. = 338.60926 e = 0.5961529 Node = 259.88159 (2000.0) a = 4.0452200 AU Inc. = 29.89627 n'= 0.12114092 q = 1.6336503 AU P = 8.136 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1982/ 820723 801 0.0 0.7+ 900625 675 0.1+ 0.6- 820711 413 0.5- 1.0+ 820723 707 0.2+ 0.1- 900626 675 0.6+ 2.4- 820713 323 (0.9- 6.4+) 820723 474 1.5+ 0.2- 900627 372 (3.5- 1.1-) 820714 323 1.3+ 1.1- 820723 474 1.3- 1.0+ 900719 372 (4.0- 2.5-) 820715 688 (4.1+ 2.7+) 820724 474 2.1- 0.7+ 900720 474 1.8+ 0.2- 820715 688 (8.1+ 3.0+) 820724 474 1.3- 1.1+ 900720 474 (3.4+ 0.1+) 820715 474 2.2+ 1.3+ 820725 801 0.5+ 0.0 1998/ 820715 474 0.9- 0.6- 820812 675 1.8- 0.6- 980216 568 0.1+ 0.0 820716 707 0.6- 1.1+ 820814 675 1.2- 1.3- 980216 568 0.7- 0.4- 820716 474 0.8- 0.3- 820819 801 1.3+ 1.0+ 980217 568 0.3- 0.2+ 820716 474 0.5+ 1.4- 820911 675 0.3+ 0.3- 980217 568 0.6- 0.4- 820717 707 1.0- 0.3- 1990/ 980218 568 0.9+ 0.0 820719 413 (2.7+ 3.0+) 900526 413 1.6+ 2.5+ 980218 568 0.5+ 0.1+ 820720 323 (1.9+ 4.6+) 900529 413 0.4- 0.2- 980425 426 0.3+ 0.3- 820721 372 (5.4+ 3.7+) 900611 372 2.2- 1.0- 980425 426 0.1+ 0.4+ 820722 474 2.7+ 1.1- 900615 413 0.4- 0.7+ 980425 426 0.3- 0.4+ 820722 474 (0.0 6.1+) 900625 675 (5.3+ 2.4+) ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2003 Apr. 20