OAA computing section circular NK 889 C/1999 K2 (Ferris)

The following improved orbital elements, by S. Nakano, are from 95 observations 1999 May 14 to Aug. 22. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.69 arc second. Epoch = 1999 Apr. 12.0 TT T = 1999 Apr. 10.44530 +/- 0.06782 (m.e.) TT Peri. = 4.56013 +/- 0.00777 Node = 300.31745 +/- 0.00074 (2000.0) Inc. = 82.18792 +/- 0.00251 q = 5.2901285 +/- 0.0001803 AU e = 0.9657250 +/- 0.0001685 1/a = +0.0064790 +/- 0.0000319 1/AU origin = +0.006912 (Q= 6) future = +0.007099 P = 1917.5 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1999/ 990528 046 0.8- 0.8- 990716 071 0.3+ 1.4+ 990514 704 1.3+ 1.3- 990528 046 0.2- 0.4+ 990716 071 0.0 1.4+ 990514 704 1.7+ 0.8- 990530 046 0.1+ 0.5+ 990716 143 0.9- 0.7- 990514 704 0.3+ 0.4+ 990530 046 0.9+ 1.1+ 990716 143 0.5+ 1.0- 990514 704 (2.1+ 1.4+) 990530 046 0.9+ 0.9+ 990716 143 0.8+ 1.8- 990519 699 1.5- 0.9- 990530 046 0.6- 0.1- 990718 113 (0.4- 3.0+) 990519 699 1.6- 0.6- 990530 046 0.7+ 0.1- 990718 113 0.2- 0.1- 990519 699 1.1- 0.7- 990531 402 0.8- 1.3+ 990722 704 0.0 1.0+ 990520 860 0.1+ 0.4- 990531 402 0.4- 0.7+ 990722 704 0.1+ 1.0- 990520 860 0.1+ 0.7- 990531 402 0.7- 0.7+ 990722 704 0.1- 1.2- 990520 699 0.6- 1.0- 990609 699 0.9+ 0.3- 990723 402 0.0 0.3+ 990520 688 0.3+ 0.4+ 990609 699 (0.9+ 2.1-) 990723 402 0.1+ 0.1- 990520 699 0.3- 0.1- 990609 699 0.6+ 0.7- 990723 402 0.6+ 0.0 990520 699 1.0- 0.1- 990611 867 0.4+ 0.5+ 990802 159 0.3- 0.5- 990520 688 0.6+ 0.2+ 990611 867 0.9+ 0.6+ 990802 159 0.7- 0.9- 990521 704 (0.0 2.6-) 990611 867 0.7+ 0.4+ 990802 159 0.4- 1.0- 990521 704 0.2+ 0.9- 990614 402 0.1+ 0.6+ 990802 159 1.0- 0.3- 990521 704 (2.2- 1.3-) 990614 402 0.2- 0.0 990802 159 0.5- 0.0 990521 704 0.1+ 0.8+ 990614 402 0.0 0.6+ 990805 159 0.8+ 0.4- 990521 327 0.3- 0.1- 990623 701 0.0 0.8- 990805 159 0.5+ 0.3- 990521 327 0.5- 0.4- 990623 701 0.1+ 1.7- 990805 159 0.0 0.6+ 990521 327 0.1- 0.1- 990623 701 0.2+ 1.1- 990805 159 1.9- 0.2+ 990522 046 0.0 0.6+ 990706 844 0.3- 0.3+ 990807 159 0.1+ 0.4+ 990522 046 0.1- 0.4+ 990706 844 0.1- 1.8- 990807 159 1.0+ 0.6+ 990522 046 0.4+ 0.4- 990706 844 (0.8+ 3.9+) 990807 159 0.4+ 1.3+ 990522 046 0.2+ 0.3+ 990708 360 0.1+ 0.4+ 990807 159 0.9+ 0.7+ 990522 118 0.0 0.3- 990708 360 0.1+ 0.2+ 990807 159 0.1+ 0.1+ 990522 118 0.3- 0.4- 990713 704 0.3+ 0.3+ 990810 557 0.0 0.0 990522 118 0.4- 0.1- 990713 704 1.4- 0.5+ 990810 557 0.1+ 0.2+ 990522 693 0.1+ 0.6+ 990713 704 1.1- 0.8- 990810 557 0.2+ 0.2+ 990522 693 0.1+ 0.6+ 990713 704 0.4- 0.9- 990822 113 0.7+ 0.6+ 990522 693 0.1+ 0.5+ 990713 704 0.1- 0.2+ 990822 113 0.1- 0.6- 990523 897 (0.7+ 2.6+) 990715 118 (0.7- 2.8-) 990822 113 0.5- 0.0 990523 897 0.5- 0.8+ 990715 118 (0.6- 3.7-) 990829 402 (1.1- 2.9-) 990523 897 1.4+ 1.7+ 990716 071 0.2+ 1.3+ 990528 046 0.4- 0.4- 990716 071 0.9+ 0.6+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2002 Dec. 10

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