OAA computing section circular NK 826 143P/Kowal-Mrkos
The following improved orbital elements, by S. Nakano, are from 81 observations 1984 to 2001. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.73 arc second. Epoch = 2000 June 25.0 TT T = 2000 July 1.79153 +/- 0.00205 (m.e.) TT Peri. = 320.58867 +/- 0.00021 Node = 245.49900 +/- 0.00051 (2000.0) Inc. = 4.68370 +/- 0.00002 q = 2.5467429 +/- 0.0000048 AU e = 0.4090367 +/- 0.0000017 a = 4.3094774 +/- 0.0000034 AU n' = 0.11017097 +/- 0.00000013 P = 8.946 +/- 0.0000107 years T = 1984 June 8.31978 TT Epoch = 1984 May 20.0 TT Peri. = 338.31742 e = 0.4842573 Node = 249.32164 (2000.0) a = 3.7789086 AU Inc. = 2.95385 n'= 0.13416971 q = 1.9489445 AU P = 7.346 years [ T = 1991 Aug. 2.30480 TT Epoch = 1991 Aug. 12.0 TT Peri. = 320.45687 e = 0.4098892 Node = 245.63294 (2000.0) a = 4.2908276 AU Inc. = 4.68685 n'= 0.11089002 q = 2.5320637 AU P = 8.888 years ] The predicted orbit for the 2009 return is as follows: T = 2009 June 12.19441 TT Epoch = 2009 June 18.0 TT Peri. = 320.76037 e = 0.4097999 Node = 245.36896 (2000.0) a = 4.3005837 AU Inc. = 4.68990 n'= 0.11051290 q = 2.5382051 AU P = 8.918 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1984/ 000402 699 0.3- 0.0 000424 360 0.1- 0.2- 840423 675 0.5- 0.2- 000404 704 0.7+ 0.1- 000424 402 1.0+ 0.7+ 840423 675 1.4+ 0.8- 000404 704 0.1+ 0.5+ 000424 402 0.3- 1.8+ 840430 675 1.7+ 2.2+ 000404 704 0.1+ 0.8+ 000426 860 0.4+ 1.3+ 840430 675 (1.8+ 3.3+) 000404 704 0.1+ 0.3- 000426 860 0.2- 1.3+ 840502 046 1.2+ 0.8- 000404 704 0.2+ 0.9+ 000426 699 1.2+ 0.4+ 840502 046 1.6- 0.4- 000408 704 0.1+ 0.1- 000426 699 0.2+ 1.0+ 840519 046 2.0- 0.0 000408 704 0.4+ 0.5+ 000426 699 0.8+ 0.5+ 840519 046 0.1- 0.7+ 000408 704 0.1- 0.3+ 000426 699 0.5+ 0.2+ 2000/ 000408 704 0.4+ 0.4- 000426 118 0.1+ 0.0 000207 704 1.3+ 0.5- 000408 704 0.3- 0.2+ 000426 118 0.2+ 0.0 000207 704 1.7- 0.2+ 000412 557 0.6- 1.8- 000428 860 0.1- 1.4+ 000207 704 0.5+ 1.3- 000412 557 0.7- 1.9- 000428 860 0.5- 1.9+ 000207 704 (0.5- 2.8-) 000412 557 0.8- 1.8- 000428 860 0.1+ 0.3+ 000301 703 0.1+ 0.0 000413 118 0.4+ 0.6- 000501 867 0.1+ 0.4+ 000301 703 0.5+ 0.3- 000413 118 0.1+ 0.1+ 000501 867 0.1- 0.3+ 000301 703 0.4+ 0.2+ 000413 118 1.1- 0.7- 000501 867 0.1+ 0.4- 000301 703 0.3+ 0.1- 000414 046 0.6+ 0.2+ 000508 360 0.1+ 0.2- 000309 704 0.1- 0.2- 000414 046 0.3- 0.4+ 000508 360 0.2- 0.2- 000309 704 0.5+ 0.7+ 000414 046 0.0 0.3- 000606 360 0.5+ 0.2+ 000309 704 0.6+ 0.3+ 000414 046 0.2- 0.6- 000606 360 0.4+ 0.2- 000309 704 0.1- 0.7+ 000414 557 1.1- 1.2- 2001/ 000313 704 0.4- 0.1+ 000414 557 1.1- 2.0- 010624 704 0.1+ 0.8- 000313 704 0.0 0.5+ 000414 557 0.9- 1.4- 010624 704 0.9+ 0.8+ 000313 704 0.3- 0.3+ 000423 867 0.1+ 0.0 010624 704 0.5- 0.4+ 000313 704 0.6- 1.0- 000423 867 0.2+ 0.0 010624 704 0.2+ 0.0 000402 699 0.5- 0.2+ 000423 867 0.1+ 0.2+ 010722 360 0.2- 0.6+ 000402 699 0.0 0.2+ 000424 360 0.1+ 0.1- 010722 360 0.5- 0.2+ 000402 699 1.1- 0.2+ 000424 402 1.2+ 0.9- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2001 Dec. 22