OAA computing section circular NK 974 157P/Tritton

The following improved orbital elements, by S. Nakano, are from 95 observations 1978 to 2003. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.63 arc second. Epoch = 2003 Oct. 8.0 TT T = 2003 Sept.24.27451 +/- 0.00198 (m.e.) TT Peri. = 147.41396 +/- 0.00142 Node = 300.73569 +/- 0.00038 (2000.0) Inc. = 7.11888 +/- 0.00008 q = 1.4216059 +/- 0.0000143 AU e = 0.5896832 +/- 0.0000041 a = 3.4646544 +/- 0.0000141 AU n' = 0.15283197 +/- 0.00000093 P = 6.449 +/- 0.0000394 years T = 1977 Oct. 28.37208 TT Epoch = 1977 Oct. 24.0 TT Peri. = 147.27878 e = 0.5872058 Node = 300.92192 (2000.0) a = 3.4792075 AU Inc. = 7.08438 n'= 0.15187405 q = 1.4361968 AU P = 6.490 years [ T = 1984 Apr. 24.23014 TT Epoch = 1984 Apr. 10.0 TT Peri. = 147.18763 e = 0.5859807 Node = 300.95246 (2000.0) a = 3.4834680 AU Inc. = 7.07636 n'= 0.15159551 q = 1.4422229 AU P = 6.502 years ] [ T = 1990 Oct. 20.85482 TT Epoch = 1990 Nov. 5.0 TT Peri. = 147.32807 e = 0.5876738 Node = 300.84753 (2000.0) a = 3.4750753 AU Inc. = 7.09772 n'= 0.15214502 q = 1.4328647 AU P = 6.478 years ] [ T = 1997 Apr. 7.69884 TT Epoch = 1997 Apr. 22.0 TT Peri. = 147.27185 e = 0.5885026 Node = 300.83847 (2000.0) a = 3.4708961 AU Inc. = 7.10582 n'= 0.15241989 q = 1.4282649 AU P = 6.466 years ] The predicted orbit for the 2010 return is as follows: T = 2010 Feb. 20.55034 TT Epoch = 2010 Feb. 13.0 TT Peri. = 148.75270 e = 0.6010099 Node = 300.11214 (2000.0) a = 3.4097688 AU Inc. = 7.27844 n'= 0.15653688 q = 1.3604640 AU P = 6.296 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1978/ 031008 938 0.1+ 0.1- 031010 J95 0.6+ 0.4- 780211 413 1.2- 0.3+ 031008 938 0.2+ 0.4- 031010 938 1.2- 0.4+ 780213 413 0.6+ 1.3- 031008 938 0.1- 0.2- 031010 J95 1.5+ 0.6- 780215 413 (5.4+ 3.1-) 031008 938 0.3+ 0.2- 031010 938 0.3- 0.0 780310 801 1.3+ 0.3+ 031008 938 0.0 0.2- 031010 J95 0.1- 0.4- 780311 801 0.1- 0.1- 031008 349 0.7+ 0.1- 031010 938 0.6- 0.1- 780313 801 1.3- 0.9+ 031008 349 0.3+ 0.0 031010 938 0.7- 0.3+ 780314 801 0.6+ 0.2- 031008 349 0.4+ 0.4+ 031010 938 0.6- 0.0 2003/ 031008 349 0.1+ 0.4+ 031010 938 0.4+ 0.2- 030922 678(13.5- 7.4+) 031008 349 0.4+ 0.0 031010 938 0.6- 0.3+ 030922 678(19.8- 10.1+) 031008 340 0.7+ 0.1+ 031010 938 1.4- 0.5+ 030922 678(19.9- 5.7+) 031008 340 0.2+ 0.1+ 031010 938 0.9- 0.1+ 030922 678(17.0- 4.3+) 031008 340 0.2+ 0.1- 031010 J95 0.4+ 0.3+ 031006 678 (2.6- 0.7+) 031008 355 0.7- 0.2+ 031010 J95 1.0+ 0.6- 031006 678 (1.9- 2.3+) 031008 340 0.7+ 0.1+ 031010 938 0.4- 0.0 031007 620 1.2+ 0.4- 031008 355 0.6- 0.2+ 031010 J95 0.4+ 0.3- 031007 620 1.1+ 0.4- 031008 340 0.3+ 0.1- 031010 J95 1.2+ 0.6- 031007 620 0.9+ 0.5- 031008 340 0.1+ 0.3+ 031010 938 0.8- 0.1- 031007 620 1.0+ 0.6- 031008 355 0.6- 0.3+ 031010 938 1.4- 0.5+ 031007 649 0.6+ 0.2- 031008 355 0.7- 0.1- 031010 938 0.8- 0.2+ 031007 649 0.6+ 0.2- 031008 372 0.7+ 0.1- 031010 938 1.4- 0.4+ 031007 649 0.6+ 0.3- 031008 372 0.1+ 0.3- 031010 938 1.0- 0.4+ 031007 850 0.2+ 0.5- 031008 372 1.3+ 0.5- 031011 620 0.6+ 0.6- 031007 673 (2.8+ 1.3-) 031009 939 1.2- 0.2+ 031013 850 0.1+ 0.4- 031007 673 (3.8+ 1.5-) 031009 939 1.4- 0.7+ 031013 850 0.2+ 0.3+ 031007 673 (3.0+ 1.6-) 031009 939 1.9- 1.0+ 031015 349 1.0- 1.1+ 031007 673 (3.2+ 1.4-) 031009 850 0.1+ 0.1- 031015 349 0.4- 0.8+ 031007 673 (3.0+ 1.8-) 031009 850 0.3+ 0.3+ 031015 349 0.1+ 0.0 031008 938 0.0 0.1- 031009 355 1.4- 0.5+ 031015 349 0.2+ 0.2- 031008 938 0.2- 0.1+ 031009 355 1.3- 0.6+ 031017 340 0.6+ 0.2+ 031008 938 0.2- 0.1- 031009 355 1.7- 0.8+ 031017 340 0.3+ 0.2+ 031008 938 0.3- 0.0 031009 379 0.8+ 0.3- 031017 340 1.0+ 0.7+ 031008 938 0.2- 0.0 031009 379 0.7+ 0.8- 031017 340 0.6+ 0.1- 031008 938 0.2- 0.2+ 031009 379 0.5- 0.3- 031017 340 1.7+ 0.2- 031008 938 0.5+ 0.3- 031009 379 0.4- 0.8+ 031017 340 0.2+ 0.3+ 031008 938 0.1+ 0.3- 031009 379 0.7+ 0.4+ 031008 938 0.2+ 0.3- 031009 379 0.1- 1.1- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2003 Oct. 19

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