OAA computing section circular NK 1384 P/2005 JN (Spacewatch)
The following improved orbital elements, by S. Nakano, are from 27 observations 2005 Apr. 4 to May 25. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.60 arc second. See an orbit on YC 2470. Epoch = 2005 July 9.0 TT T = 2005 June 20.35418 +/- 0.06165 (m.e.) TT Peri. = 153.64728 +/- 0.02272 Node = 70.80018 +/- 0.00255 (2000.0) Inc. = 8.85682 +/- 0.00060 q = 2.2756048 +/- 0.0001539 AU e = 0.3494278 +/- 0.0000812 a = 3.4978515 +/- 0.0001420 AU n' = 0.15066141 +/- 0.00000917 P = 6.542 +/- 0.0003983 years (+/- 0.15 day) The predicted orbit for the 2012 return is as follows: T = 2012 Jan. 6.10810 TT Epoch = 2011 Dec. 25.0 TT Peri. = 153.56659 e = 0.3476637 Node = 70.78986 (2000.0) a = 3.5040335 AU Inc. = 8.85042 n'= 0.15026288 q = 2.2858081 AU P = 6.559 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2005/ 050503 691 0.1+ 0.0 050513 703 0.8+ 0.1- 050404 703 1.5- 0.4- 050504 691 0.2- 0.1- 050513 703 (0.7+ 3.1-) 050404 703 0.6+ 1.4- 050504 691 0.0 0.4- 050513 703 0.3- 1.2- 050404 703 0.8+ 0.3+ 050504 691 0.2- 0.4- 050515 644 0.8- 0.0 050404 703 0.9- 0.7+ 050509 683 0.3+ 0.2- 050515 644 0.3- 0.1+ 050415 699 0.2- 1.5+ 050509 683 (2.2- 0.5+) 050515 644 0.3- 0.1+ 050415 699 0.2+ 0.1+ 050509 683 0.3+ 1.5+ 050517 J78 (2.2+ 1.6-) 050415 699 (2.4+ 0.6-) 050512 693 0.4- 0.3- 050525 213 0.5+ 0.6+ 050415 699 1.7+ 0.2+ 050512 693 0.5- 0.4- 050525 213 0.2+ 0.4+ 050503 691 0.0 0.2- 050512 693 0.3- 0.4- 050525 213 0.2+ 0.2+ 050503 691 0.2+ 0.1+ 050513 703 0.1+ 0.2- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2006 Dec. 3