OAA computing section circular NK 653 17P/Holmes

The following improved orbital elements, by S. Nakano, are from 69 observations 1964-1993, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 0.79 arc second. Epoch = 1993 Apr. 3.0 TT T = 1993 Apr. 10.74504 +/- 0.00121 (m.e.) TT Peri. = 23.22257 +/- 0.00037 Node = 328.04608 +/- 0.00011 (2000.0) Inc. = 19.17033 +/- 0.00003 q = 2.1767580 +/- 0.0000017 AU e = 0.4104141 +/- 0.0000005 a = 3.6920114 +/- 0.0000011 AU n' = 0.13893431 +/- 0.00000006 P = 7.094 +/- 0.0000032 years A1 = +0.144 +/- 0.040 A2 = +0.03021 +/- 0.00104 T = 1964 Nov. 15.92802 TT Epoch = 1964 Nov. 21.0 TT Peri. = 21.79281 e = 0.3788960 Node = 330.26077 (2000.0) a = 3.7786751 AU Inc. = 19.52377 n'= 0.13418215 q = 2.3469501 AU P = 7.345 years T = 1972 Jan. 30.82001 TT Epoch = 1972 Feb. 13.0 TT Peri. = 23.42681 e = 0.4136378 Node = 328.16851 (2000.0) a = 3.6754888 AU Inc. = 19.22385 n'= 0.13987220 q = 2.1551676 AU P = 7.046 years T = 1979 Feb. 22.66161 TT Epoch = 1979 Feb. 16.0 TT Peri. = 23.59075 e = 0.4131163 Node = 328.08745 (2000.0) a = 3.6804575 AU Inc. = 19.21037 n'= 0.13958905 q = 2.1600004 AU P = 7.061 years T = 1986 Mar. 14.13432 TT Epoch = 1986 Mar. 31.0 TT Peri. = 23.33002 e = 0.4118149 Node = 328.04969 (2000.0) a = 3.6866934 AU Inc. = 19.19086 n'= 0.13923504 q = 2.1684580 AU P = 7.079 years The predicted orbit for the 2000 return is as follows: T = 2000 May 11.82238 TT Epoch = 2000 May 16.0 TT Peri. = 23.34808 e = 0.4120208 Node = 328.01009 (2000.0) a = 3.6829381 AU Inc. = 19.18781 n'= 0.13944805 q = 2.1654911 AU P = 7.068 years The following residuals in seconds of arc are from the above orbital elements: 19/ 19/ 19/ 640716 689 1.5+ 0.5- 730130 691 0.6+ 0.4+ 861227 691 0.6- 1.1- 640716 689 1.0+ 0.1+ 730130 691 1.2+ 2.0+ 861229 691 0.1+ 1.4- 640717 689 0.2- 1.0- 790720 801 (5.4- 2.6+) 861229 691 0.2+ 0.7- 640717 689 0.7+ 0.9- 790730 372 (2.9- 6.3+) 861229 691 0.3- 1.0- 640911 689 0.6+ 0.2- 790731 801 (5.6+ 11.5+) 930524 372 1.9- 0.7+ 640911 689 1.3+ 0.8- 790901 801 1.5+ 1.2+ 930525 372 (4.2- 2.0-) 640929 689 0.3- 0.3+ 790917 801 0.3- 0.1+ 930721 691 1.4- 0.2- 640929 689 0.1+ 0.2- 800211 801 0.0 0.5+ 930722 360 0.7+ 0.5+ 641028 689 0.0 0.1+ 860609 675 0.5- 0.4+ 930722 360 0.7+ 0.3+ 641028 689 1.4- 1.0- 860609 675 (7.4- 35.8+) 930822 691 1.6- 0.1+ 641128 689 0.9+ 0.1+ 860609 675 0.2- 0.4+ 930822 691 1.6- 0.3- 650102 689 2.1- 0.1- 860610 675 0.4- 0.6+ 930822 691 1.2- 0.5- 710620 693 0.6+ 1.2+ 860610 675 (9.9+ 11.1-) 930824 360 0.7+ 0.5+ 710627 691 0.2- 0.8+ 860610 675 0.4- 0.6+ 930824 360 0.2- 0.4+ 710627 691 0.0 1.5+ 860611 675 0.5+ 0.4+ 930915 658 0.1+ 0.6+ 710921 691 1.4- 0.0 860611 675(14.0+ 0.6-) 930915 658 0.0 0.1+ 710921 691 1.6- 0.1- 860611 675 0.8+ 0.4+ 930915 658 0.1+ 0.5+ 710922 691 1.1- 0.3- 860927 691 0.8+ 0.7- 930926 360 0.1- 0.1- 711015 691 0.5+ 0.9+ 861025 691 (1.3+ 2.4+) 930926 360 0.4+ 0.3- 711016 691 0.9+ 0.1+ 861025 691 1.9+ 2.1+ 931011 360 0.0 0.1- 720913 691 0.6- 0.9- 861025 691 (1.8+ 2.3+) 931011 360 1.4+ 0.1- 720913 691 0.0 0.4- 861030 691 1.0- 0.4+ 931019 360 0.3+ 0.1- 721003 691 0.1+ 0.1- 861030 691 0.3- 0.6- 931019 360 0.5+ 0.2- 721003 691 0.0 0.5+ 861030 691 0.4- 0.1- 931020 657 0.4+ 0.4- 721213 691 0.0 0.2+ 861227 691 0.7- 1.3- 931020 657 0.2- 0.0 721213 691 0.9- 0.5+ 861227 691 0.7- 0.6- 931020 657 1.1+ 0.6+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1997 May 3

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