OAA computing section circular NK 806 P/2001 F1 (NEAT)

The following improved orbital elements, by S. Nakano, are from 123 observations 2001 Mar. 24 to July 23. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.66 arc second. Epoch = 2000 Dec. 2.0 TT T = 2000 Nov. 21.83414 +/- 0.11897 (m.e.) TT Peri. = 80.69849 +/- 0.01752 Node = 92.83834 +/- 0.00129 (2000.0) Inc. = 19.08703 +/- 0.00013 q = 4.1525670 +/- 0.0001388 AU e = 0.3557187 +/- 0.0000212 a = 6.4452698 +/- 0.0000469 AU n' = 0.06023410 +/- 0.00000066 P = 16.363 +/- 0.0001787 years (+/- 0.07 day) The predicted orbit for the 2017 return is as follows: T = 2017 May 4.94355 TT Epoch = 2017 May 7.0 TT Peri. = 80.42471 e = 0.3596979 Node = 92.65806 (2000.0) a = 6.5340942 AU Inc. = 19.05356 n'= 0.05901005 q = 4.1837942 AU P = 16.702 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2001/ 010401 867 0.2+ 0.1+ 010510 118 0.2- 0.6- 010324 608 1.1+ 0.9+ 010401 867 0.1+ 0.4+ 010511 170 0.5- 0.0 010324 608 0.9+ 1.6+ 010402 046 0.7- 0.1+ 010512 360 0.9+ 0.1- 010324 608 1.0+ 1.3+ 010402 046 0.5- 0.4+ 010512 360 1.0+ 0.0 010325 859 0.5+ 0.3+ 010402 046 0.2+ 0.5+ 010513 402 0.8+ 0.3- 010325 859 0.3- 0.5- 010402 046 0.4+ 0.7+ 010513 402 0.3- 1.0+ 010325 859 0.0 0.7+ 010403 402 0.4- 0.2- 010513 402 1.3+ 0.9+ 010325 854 1.7+ 0.2+ 010403 402 0.2- 0.0 010520 046 0.7- 0.1- 010325 854 0.5- 0.6- 010403 402 1.4- 0.1+ 010520 046 1.4- 0.4- 010326 649 0.2- 0.2+ 010404 402 0.5- 0.6- 010520 046 0.4- 0.2+ 010326 649 1.3- 0.2+ 010404 402 0.8- 0.3- 010521 699 0.7- 0.0 010326 649 0.2- 0.4+ 010404 402 0.0 0.3- 010521 699 0.5+ 0.7- 010326 649 0.1- 0.1+ 010413 372 0.4- 0.5+ 010521 699 0.4- 0.4- 010327 649 0.7+ 0.2+ 010414 170 1.0- 0.2+ 010521 699 0.6+ 1.3- 010327 649 0.1- 0.9+ 010414 170 0.2+ 0.0 010525 118 1.1- 0.8+ 010327 649 0.5- 0.5+ 010414 170 1.6+ 0.3- 010525 118 1.2+ 1.0- 010327 608 0.9+ 0.8- 010414 170 1.1- 0.3- 010525 118 0.2+ 0.1+ 010327 608 0.5+ 1.3- 010415 372 1.3- 0.2+ 010607 170 0.5- 1.1- 010327 608 0.3+ 0.9- 010419 341 0.2+ 0.7+ 010607 170 0.3- 0.7- 010328 684 0.5- 0.1+ 010419 341 0.2+ 0.3- 010607 170 (3.0+ 0.2-) 010328 684 0.3- 0.2- 010419 341 0.2- 0.5+ 010609 682 1.2+ 0.3- 010328 850 1.0+ 0.4+ 010419 341 0.3+ 0.9- 010609 682 0.5+ 0.3+ 010328 684 0.7- 0.2- 010419 372 0.4+ 0.4+ 010611 360 0.6+ 0.3+ 010328 850 (2.3+ 3.0+) 010419 402 1.3+ 0.1- 010611 360 0.4+ 0.7+ 010328 422 (3.1- 2.6-) 010419 402 1.5+ 0.9+ 010611 360 0.5- 0.1+ 010328 422 (3.8- 1.3-) 010419 402 1.0+ 0.8- 010614 644 0.7+ 0.7+ 010328 422 0.5- 0.5- 010419 360 0.5+ 0.5- 010614 644 0.3+ 0.2- 010328 046 1.6- 0.2+ 010419 360 0.7+ 0.6- 010614 644 0.2+ 0.0 010328 046 0.2- 0.6- 010421 170 (3.2- 0.1-) 010616 699 0.1+ 0.4+ 010328 046 0.1- 0.4- 010423 170 0.6- 0.2+ 010616 699 0.2- 0.1- 010328 046 0.8- 0.5- 010425 170 (2.6- 1.5+) 010616 699 0.9- 0.9+ 010328 046 0.7- 0.0 010426 118 0.8+ 1.1- 010616 699 0.9- 0.5+ 010329 684 0.8- 0.1+ 010426 118 0.6+ 0.1- 010616 170 (0.8+ 2.7-) 010329 684 0.6- 0.0 010428 170 0.1+ 0.3- 010616 170 0.2- 1.3- 010329 608 1.1+ 1.2- 010428 170 1.6- 0.2+ 010623 504 0.7+ 0.6+ 010329 608 0.8+ 0.9- 010429 046 0.7- 0.1+ 010623 504 0.2+ 0.2+ 010329 608 0.3+ 0.7- 010429 046 0.2+ 0.2+ 010623 504 0.7- 1.1+ 010331 360 0.1- 0.4- 010429 046 0.6+ 0.4+ 010624 644 0.0 0.3- 010331 360 0.1- 0.5- 010502 682 0.3+ 1.9+ 010624 644 0.2- 0.4- 010331 046 0.5+ 0.2+ 010502 682 0.5+ 1.2+ 010624 644 0.6- 0.6- 010331 046 0.3- 0.1+ 010508 170 0.7- 0.0 010723 360 0.1+ 0.1+ 010331 046 0.0 0.5- 010508 170 1.0- 0.1- 010723 360 0.5+ 0.3- 010331 046 0.3+ 0.1- 010508 170 1.4- 0.0 010723 360 0.1- 0.1+ 010401 867 0.6+ 0.3+ 010510 118 0.4- 0.5- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2001 July 31

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