OAA computing section circular NK 1315 143P/Kowal-Mrkos

The following improved orbital elements, by S. Nakano, are from 87 observations 1984 to 2004. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.72 arc second. See previous orbits in NK 510R and NK 826. Epoch = 2000 June 25.0 TT T = 2000 July 1.78887 +/- 0.00032 (m.e.) TT Peri. = 320.58862 +/- 0.00020 Node = 245.49846 +/- 0.00022 (2000.0) Inc. = 4.68372 +/- 0.00002 q = 2.5467370 +/- 0.0000015 AU e = 0.4090389 +/- 0.0000004 a = 4.3094829 +/- 0.0000009 AU n' = 0.11017075 +/- 0.00000004 P = 8.946 +/- 0.0000029 years T = 1984 June 8.31823 TT Epoch = 1984 May 20.0 TT Peri. = 338.31785 e = 0.4842608 Node = 249.32087 (2000.0) a = 3.7789008 AU Inc. = 2.95386 n'= 0.13417013 q = 1.9489272 AU P = 7.346 years [ T = 1991 Aug. 2.29590 TT Epoch = 1991 Aug. 12.0 TT Peri. = 320.45681 e = 0.4098913 Node = 245.63240 (2000.0) a = 4.2908330 AU Inc. = 4.68687 n'= 0.11088982 q = 2.5320578 AU P = 8.888 years ] The predicted orbit for the 2009 return is as follows: T = 2009 June 12.19815 TT Epoch = 2009 June 18.0 TT Peri. = 320.76031 e = 0.4098020 Node = 245.36841 (2000.0) a = 4.3005894 AU Inc. = 4.68992 n'= 0.11051268 q = 2.5381994 AU P = 8.919 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1984/ 000404 704 0.1+ 0.5+ 000426 860 0.3- 1.3+ 840423 675 0.4- 0.3- 000404 704 0.1+ 0.8+ 000426 699 1.1+ 0.4+ 840423 675 1.5+ 0.9- 000404 704 0.1+ 0.3- 000426 699 0.1+ 1.1+ 840430 675 1.8+ 2.0+ 000404 704 0.2+ 0.9+ 000426 699 0.7+ 0.5+ 840430 675 (1.8+ 3.2+) 000408 704 0.1+ 0.1- 000426 699 0.4+ 0.2+ 840502 046 1.2+ 0.9- 000408 704 0.4+ 0.5+ 000426 118 0.0 0.1+ 840502 046 1.6- 0.6- 000408 704 0.1- 0.3+ 000426 118 0.2+ 0.0 840519 046 2.3- 0.1- 000408 704 0.5+ 0.4- 000428 860 0.1- 1.4+ 840519 046 0.4- 0.6+ 000408 704 0.2- 0.2+ 000428 860 0.5- 1.9+ 2000/ 000412 557 0.6- 1.8- 000428 860 0.0 0.3+ 000207 704 1.5+ 0.4- 000412 557 0.6- 1.9- 000501 867 0.0 0.4+ 000207 704 1.5- 0.2+ 000412 557 0.8- 1.8- 000501 867 0.2- 0.3+ 000207 704 0.6+ 1.2- 000413 118 0.4+ 0.6- 000501 867 0.1+ 0.4- 000207 704 (0.3- 2.7-) 000413 118 0.1+ 0.1+ 000508 360 0.0 0.2- 000301 703 0.2+ 0.0 000413 118 1.1- 0.7- 000508 360 0.4- 0.2- 000301 703 0.6+ 0.3- 000414 046 0.6+ 0.2+ 000606 360 0.2+ 0.3+ 000301 703 0.5+ 0.2+ 000414 046 0.3- 0.4+ 000606 360 0.1+ 0.2- 000301 703 0.4+ 0.0 000414 046 0.0 0.2- 2001/ 000309 704 0.0 0.2- 000414 046 0.2- 0.6- 010624 704 0.2+ 1.0- 000309 704 0.6+ 0.7+ 000414 557 1.1- 1.2- 010624 704 0.9+ 0.6+ 000309 704 0.7+ 0.4+ 000414 557 1.1- 2.0- 010624 704 0.5- 0.1+ 000309 704 0.0 0.8+ 000414 557 0.9- 1.4- 010624 704 0.3+ 0.2- 000313 704 0.4- 0.2+ 000423 867 0.1+ 0.0 010722 360 0.1- 0.4+ 000313 704 0.1+ 0.5+ 000423 867 0.2+ 0.1+ 010722 360 0.5- 0.0 000313 704 0.2- 0.3+ 000423 867 0.1+ 0.2+ 2004/ 000313 704 0.5- 1.0- 000424 360 0.1+ 0.1- 040924 291 0.0 0.3+ 000402 699 0.4- 0.2+ 000424 402 1.1+ 0.9- 040924 291 0.2+ 0.8+ 000402 699 0.0 0.2+ 000424 360 0.2- 0.2- 040924 291 0.1- 0.6+ 000402 699 1.1- 0.2+ 000424 402 0.9+ 0.7+ 041014 691 0.1- 0.4+ 000402 699 0.2- 0.0 000424 402 0.3- 1.9+ 041014 691 0.5- 0.1+ 000404 704 0.7+ 0.1- 000426 860 0.4+ 1.3+ 041014 691 0.9- 0.4+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2006 Apr. 8

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