OAA computing section circular NK 1200 146P/Shoemaker-LINEAR

The following improved orbital elements, by S. Nakano, are from 46 observations 1984 to 2001. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.85 arc second. See a previous orbit on MPC 41388. Epoch = 2000 June 25.0 TT T = 2000 July 14.31011 +/- 0.00042 (m.e.) TT Peri. = 317.77043 +/- 0.00026 Node = 55.35790 +/- 0.00010 (2000.0) Inc. = 21.61651 +/- 0.00007 q = 1.3192701 +/- 0.0000045 AU e = 0.6667725 +/- 0.0000011 a = 3.9590673 +/- 0.0000048 AU n' = 0.12511655 +/- 0.00000023 P = 7.878 +/- 0.0000144 years T = 1984 Sept.26.69050 TT Epoch = 1984 Sept.17.0 TT Peri. = 317.59666 e = 0.6666824 Node = 55.49967 (2000.0) a = 3.9606512 AU Inc. = 21.58652 n'= 0.12504150 q = 1.3201546 AU P = 7.882 years [ T = 1992 Aug. 21.58399 TT Epoch = 1992 Aug. 6.0 TT Peri. = 317.65316 e = 0.6656521 Node = 55.43037 (2000.0) a = 3.9709002 AU Inc. = 21.57055 n'= 0.12455771 q = 1.3276623 AU P = 7.913 years ] The predicted orbit for the 2008 return is as follows: T = 2008 May 21.39260 TT Epoch = 2008 May 14.0 TT Peri. = 316.83934 e = 0.6479385 Node = 53.56832 (2000.0) a = 4.0268815 AU Inc. = 23.07879 n'= 0.12196937 q = 1.4177100 AU P = 8.081 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1984/ 000928 684 0.2+ 0.4- 001106 704 0.9+ 1.0+ 841118 688 (2.4+ 8.3-) 000928 684 0.7- 0.5+ 001106 402 1.2+ 0.2- 841118 688 (1.0- 8.7-) 000929 046 0.2+ 0.1+ 001106 402 0.4+ 0.5+ 841121 675 0.7+ 0.7- 000929 046 0.9+ 0.6+ 001106 402 (8.5- 2.8+) 841121 675 0.2- 2.4- 000929 046 0.1- 0.5+ 001128 360 0.9+ 0.2+ 841127 688 (1.5- 3.6+) 000929 046 0.6+ 0.1- 001128 360 0.1- 0.3+ 841127 688 (1.6+ 7.6-) 000929 046 0.0 0.1+ 001204 402 0.3- 0.1+ 841128 372 0.2+ 0.2+ Y 000929 046 0.0 0.3+ 001204 402 1.1+ 0.2- 841130 675 1.5- 2.3- 000929 118 0.9- 0.7+ 001204 402 0.2+ 0.2- 841130 675 (3.6- 0.9-) 000929 118 1.1- 1.0+ 001205 360 0.7+ 0.3+ 841218 801 1.2+ 2.2+ 000929 557 1.0- 0.1+ 001205 360 0.4+ 0.1+ 841220 707 2.3+ 2.2+ 000929 557 0.3- 0.2+ 001229 360 0.0 0.4- 2000/ 000929 557 0.9- 0.1+ 001229 360 0.3- 0.1- 000927 704 (3.6- 3.0-) 001001 704 0.6+ 0.7+ 001230 699 1.5- 1.3- 000927 704 (3.7- 3.2-) 001001 704 0.3+ 0.6+ 001230 699 (0.5- 2.1-) 000927 704 0.7- 1.0- 001001 704 1.7- 1.3+ 001230 699 0.5- 0.4+ 000927 704 (4.6- 0.8-) 001002 704 (2.0+ 3.1+) 001230 699 (2.2- 1.2-) 000928 704 (3.0- 2.5+) 001002 704 0.9+ 0.1- 2001/ 000928 704 0.6+ 0.0 001002 704 1.6- 0.7+ 010220 867 0.2- 0.6- 000928 704 0.1- 0.7+ 001106 704 (2.0+ 0.5+) 010220 867 0.2- 1.4- 000928 684 0.3- 0.1- 001106 704 0.1- 0.7+ 010220 867 0.0 0.8- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2005 July 4

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