OAA computing section circular NK 1580 187P/LINEAR

The following improved orbital elements, by S. Nakano, are from 79 observations 1999 to 2008. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.64 arc second. See orbits in NK 1020 (= HICQ 2007) and YC 2550 (first linkage). Epoch = 2008 Oct. 21.0 TT T = 2008 Oct. 6.48774 +/- 0.02028 (m.e.) TT Peri. = 131.97693 +/- 0.00375 Node = 112.00201 +/- 0.00020 (2000.0) Inc. = 13.73254 +/- 0.00003 q = 3.6933193 +/- 0.0000469 AU e = 0.1705419 +/- 0.0000099 a = 4.4526892 +/- 0.0000174 AU n' = 0.10489880 +/- 0.00000062 P = 9.396 +/- 0.0000552 years T = 1999 May 12.26439 TT Epoch = 1999 May 22.0 TT Peri. = 132.20050 e = 0.1694642 Node = 112.01802 (2000.0) a = 4.4703353 AU Inc. = 13.71661 n'= 0.10427830 q = 3.7127734 AU P = 9.452 years The predicted orbit for the 2018 return is as follows: T = 2018 May 26.48838 TT Epoch = 2018 June 11.0 TT Peri. = 133.23685 e = 0.1560186 Node = 109.98081 (2000.0) a = 4.5981377 AU Inc. = 13.60214 n'= 0.09996112 q = 3.8807429 AU P = 9.860 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1999/ 990612 557 0.1- 0.1- 990615 360 0.1+ 0.1+ 990512 704 0.3+ 1.0+ 990612 120 1.2- 1.7- 990708 360 0.4+ 0.5- 990512 704 1.9- 0.4+ 990612 557 0.3- 0.1+ 990708 360 0.5+ 0.3- 990512 704 2.0- 0.4- 990613 859 (7.1+ 3.6-) 990721 699 0.1+ 0.5+ 990517 704 0.2- 0.4+ 990613 859 (7.6+ 3.7-) 990721 699 1.1+ 0.5+ 990517 704 1.5- 0.3+ 990613 859 (6.1+ 6.7-) 990721 699 0.2- 0.3- 990517 704 (1.7- 2.3+) 990613 120 0.1+ 0.1- 990731 402 0.8+ 1.2+ 990606 699 0.6- 0.8+ 990613 120 0.3- 0.2+ 990731 402 (1.6+ 2.4-) 990606 699 0.0 0.9+ 990613 120 0.2+ 0.2- 990731 402 1.6+ 1.1- 990606 699 0.3- 0.1- 990613 120 1.2+ 0.0 2007/ 990608 704 0.3- 0.4- 990614 704 0.2+ 0.4+ 070309 G96 0.5- 0.4- 990608 704 1.1+ 0.1- 990614 704 1.7+ 0.3+ 070309 G96 0.1+ 0.4+ 990608 704 0.3+ 0.3+ 990614 704 1.6+ 0.3- 070309 G96 0.2+ 0.3+ 990608 704 0.9- 0.9- 990614 704 0.0 0.1+ 070309 G96 0.0 0.1+ 990610 704 0.1+ 0.1+ 990614 704 (0.1+ 2.1-) 070310 G96 0.0 0.4- 990610 704 0.1- 0.0 990614 704 0.2+ 0.9- 070310 G96 0.2- 0.3- 990610 704 0.1- 0.1- 990614 704 0.2+ 0.5- 070310 G96 0.2- 0.1+ 990610 704 0.1- 0.2- 990614 704 0.6- 0.7- 070407 G96 0.5+ 1.0+ 990610 704 0.5+ 0.1- 990614 734 0.8+ 0.7+ 070407 G96 0.2+ 0.5- 990612 428 1.3- 1.3- 990614 704 0.2- 0.2+ 070407 G96 0.1- 0.4+ 990612 428 1.2- 1.0- 990614 734 0.7+ 1.2+ 070407 G96 0.2+ 0.2- 990612 120 0.1+ 0.4- 990614 704 0.1- 0.5+ 071231 691 0.6- 0.1+ 990612 120 0.5- 1.3- 990614 734 0.3+ 0.6+ 071231 691 0.3- 0.3- 990612 120 1.0- 0.8- 990614 734 0.9+ 0.9+ 071231 691 0.2- 0.2+ 990612 046 0.2+ 0.1+ 990614 402 0.3- 1.0- 2008/ 990612 046 0.3- 0.3+ 990614 402 0.4+ 0.3- 080116 691 0.3+ 0.4- 990612 046 0.3+ 1.1+ 990614 402 0.5+ 0.4- 080116 691 0.2+ 0.2- 990612 046 0.1+ 1.0+ 990614 402 0.2- 0.7- 080116 691 0.3+ 0.2+ 990612 046 0.2+ 1.0+ 990615 360 0.1+ 0.0 990612 046 0.2- 0.9+ 990615 360 0.1- 0.1- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2008 Feb. 15

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