OAA computing section circular NK 1398 P/2005 T2 (Christensen)

The following improved orbital elements, by S. Nakano, are from 69 observations 2005 Oct. 7 to Nov. 25. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.62 arc second. See an orbit on YC 2491. Epoch = 2005 Apr. 20.0 TT T = 2005 Apr. 11.26239 +/- 0.03444 (m.e.) TT Peri. = 58.33306 +/- 0.01881 Node = 260.62292 +/- 0.00338 (2000.0) Inc. = 8.33818 +/- 0.00042 q = 2.2108452 +/- 0.0002633 AU e = 0.4220226 +/- 0.0001581 a = 3.8251412 +/- 0.0002984 AU n' = 0.13174461 +/- 0.00001541 P = 7.481 +/- 0.0008753 years (+/- 0.32 day) The predicted orbit for the 2012 return is as follows: T = 2012 Oct. 7.19560 TT Epoch = 2012 Sept.30.0 TT Peri. = 58.65136 e = 0.4219414 Node = 260.45344 (2000.0) a = 3.8216611 AU Inc. = 8.33756 n'= 0.13192461 q = 2.2091442 AU P = 7.471 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2005/ 051010 649 0.7+ 0.2- 051020 673 0.0 0.2- 051007 G96 0.7+ 0.1+ 051010 649 0.1+ 0.8- 051020 673 0.1- 0.1- 051007 G96 0.1+ 0.4+ 051010 649 (0.3+ 2.1-) 051020 673 0.2+ 0.1- 051007 G96 0.0 0.3+ 051010 649 0.6+ 1.2- 051024 413 0.2+ 0.0 051007 G96 0.3- 0.2- 051010 651 1.7+ 0.2+ 051024 413 0.0 0.3- 051007 G96 0.2- 0.7+ 051010 651 1.1+ 1.2- 051026 215 (3.4+ 7.8-) 051007 G96 0.4+ 0.5+ 051010 A50 0.2- 0.0 051029 G96 0.4+ 0.0 051007 G96 1.1- 0.3+ 051010 A50 1.1- 0.1+ 051029 G96 0.2- 0.1- 051007 G96 0.1- 0.5+ 051011 926 0.2+ 0.2- 051029 G96 0.3- 0.4- 051007 G96 0.1- 1.0+ 051011 682 0.7- 0.1+ 051029 G96 0.2- 0.4- 051007 G96 0.1+ 1.1+ 051011 291 0.2+ 0.3- 051030 204 0.1+ 0.3- 051007 G96 0.2- 0.8+ 051011 291 0.1- 0.1- 051030 204 1.3- 0.6- 051007 G96 0.1+ 0.8+ 051011 291 0.1+ 0.2- 051101 213 0.0 0.4+ 051007 G96 0.3- 0.9+ 051011 682 1.8- 0.4- 051101 213 0.2+ 0.7+ 051007 G96 0.5- 0.9+ 051011 682 0.6- 0.8- 051101 213 0.2+ 0.1- 051007 G96 0.2- 1.1+ 051012 152 1.2+ 0.2+ 051106 673 0.3- 0.5+ 051007 G96 0.6- 0.8+ 051012 152 0.5+ 1.7+ 051106 673 0.0 0.3+ 051008 682 0.8- 1.6- 051012 152 1.0+ 0.0 051106 673 0.5- 0.5+ 051008 682 0.8- 1.3- 051012 152 1.0+ 0.0 051106 673 0.4- 0.7+ 051008 682 0.8- 1.3- 051012 152 (2.8+ 0.2+) 051125 G96 0.2+ 0.0 051009 E12 0.3+ 0.0 051014 673 0.2+ 0.1+ 051125 G96 0.3+ 0.1- 051009 J95 0.3- 0.1+ 051014 673 0.1+ 0.2- 051125 G96 0.0 0.5- 051009 J95 0.2- 0.9- 051014 673 0.5+ 0.1+ 051125 G96 0.1+ 0.1+ 051009 J95 0.0 1.1- 051014 673 0.5+ 0.2- 051010 649 0.8+ 1.4- 051020 673 0.2+ 0.4+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2006 Dec. 4

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