OAA computing section circular NK 763 C/2000 O1 (Koehn)

The following improved orbital elements, by S. Nakano, are from 55 observations 1998 Dec. 14 to 2000 Nov. 22. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.77 arc second. Epoch = 2000 Jan. 17.0 TT T = 2000 Jan. 27.39543 +/- 0.00512 (m.e.) TT Peri. = 55.11310 +/- 0.00048 Node = 88.86221 +/- 0.00013 (2000.0) Inc. = 148.09758 +/- 0.00005 q = 5.9216471 +/- 0.0000258 AU e = 1.0006946 +/- 0.0000269 1/a = -0.0001173 +/- 0.0000045 1/AU origin = +0.000042 (Q= 7) future = +0.000117 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1998/ 991213 704 1.0+ 0.8- 000823 402 0.2+ 0.8+ 981214 704 0.4+ 1.7- 2000/ 000823 402 0.4+ 1.3+ 981214 704 1.3+ 0.4- 000720 699 1.5+ 0.9+ 000823 402 0.9+ 0.8+ 981214 704 1.7- 0.7+ 000720 699 (2.7+ 0.2+) 000824 352 1.7+ 0.5- 981214 704 (1.4- 2.2-) 000720 699 0.8- 1.0- 000824 352 0.5+ 1.3- 981217 704 0.9+ 0.0 000720 699 0.5+ 0.5- 000829 402 0.7- 0.8+ 981217 704 0.8+ 0.0 000722 611 1.4+ 0.9+ 000829 402 0.8+ 0.6- 981217 704 0.4+ 0.5+ 000722 611 0.1- 0.7- 000829 402 0.4- 0.2- 981217 704 0.9- 1.5+ 000722 046 0.1- 1.0+ 000925 106 1.7- 0.6- 981217 704 0.1+ 0.0 000722 046 0.0 0.4+ 000925 106 0.3+ 0.7+ 1999/ 000723 739 (5.4+ 1.1-) 000925 106 0.2+ 0.3- 991031 704 1.4- 0.2+ 000723 739 1.6- 0.8- 000926 360 0.5- 0.1- 991031 704 0.5- 0.6- 000723 557 0.0 0.2+ 000926 360 0.6- 0.2- 991031 704 1.4- 0.8- 000723 557 0.7+ 0.5+ 000926 360 0.4- 0.2+ 991101 704 0.5- 0.3+ 000724 658 1.4- 0.2+ 000927 118 1.2+ 0.5- 991101 704 0.2- 0.3+ 000724 658 0.8- 0.2- 000927 118 1.0+ 0.0 991101 704 0.4- 0.2- 000728 402 0.2- 0.7- 001122 360 0.6- 0.5- 991101 704 0.3- 1.0- 000728 402 0.2+ 0.5+ 001122 360 0.1+ 0.4+ 991213 704 0.8+ 0.6+ 000728 402 0.9+ 0.9+ 001122 360 0.4- 0.3- 991213 704 0.4+ 0.2- 000823 360 0.6- 0.2- 991213 704 1.0+ 0.8+ 000823 360 1.2- 0.2- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2000 Dec. 21

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