OAA computing section circular NK 1216 170P/Christensen (2005 M1)
The following improved orbital elements, by S. Nakano, are from 74 observations 1997 to 2005. 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. Epoch = 2006 Jan. 25.0 TT T = 2006 Jan. 26.77529 +/- 0.01718 (m.e.) TT Peri. = 225.45432 +/- 0.00439 Node = 143.03493 +/- 0.00012 (2000.0) Inc. = 10.12568 +/- 0.00012 q = 2.9297527 +/- 0.0000456 AU e = 0.3037979 +/- 0.0000097 a = 4.2081925 +/- 0.0000209 AU n' = 0.11417228 +/- 0.00000085 P = 8.633 +/- 0.0000644 years T = 1997 June 20.86028 TT Epoch = 1997 June 1.0 TT Peri. = 225.43336 e = 0.3058615 Node = 143.06199 (2000.0) a = 4.1915527 AU Inc. = 10.13939 n'= 0.11485282 q = 2.9095181 AU P = 8.581 years The predicted orbit for the 2014 return is as follows: T = 2014 Sept.18.19329 TT Epoch = 2014 Sept.20.0 TT Peri. = 225.85646 e = 0.3046420 Node = 142.91948 (2000.0) a = 4.1998754 AU Inc. = 10.12808 n'= 0.11451160 q = 2.9204168 AU P = 8.607 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1997/ 050704 413 0.1+ 0.5- 050825 213 0.2- 1.4+ 971031 566 0.7- 0.4+ 050726 213 0.5+ 0.4- 050825 213 0.5- 0.7+ 971031 566 0.6+ 0.9+ 050727 213 0.0 0.1- 050827 644 0.2+ 0.3+ 971031 566 1.0+ 0.4- 050727 213 0.4- 0.6+ 050827 644 0.4+ 0.2+ 971130 566 0.2+ 0.8- 050804 644 0.4+ 0.2+ 050827 644 0.4+ 0.0 971227 566 1.0- 1.5- 050804 644 0.1+ 0.0 050829 704 0.1- 0.3+ 2005/ 050804 644 0.1+ 0.3- 050829 704 1.3+ 0.6+ 050617 G96 0.5- 0.4- 050805 644 0.0 0.1+ 050829 704 0.8+ 0.7+ 050617 G96 0.3- 0.4- 050805 644 0.0 0.0 050829 704 (0.2- 3.3+) 050617 G96 0.0 0.4- 050805 644 0.2+ 0.3- 050829 704 1.5+ 0.2+ 050617 G96 0.2+ 0.7- 050806 644 0.1+ 0.3+ 050829 699 0.6- 0.1+ 050618 734 0.4- 0.3+ 050806 644 0.5+ 0.3- 050829 699 0.4- 0.8- 050618 734 0.1- 1.2- 050806 644 0.0 0.1- 050829 699 0.5- 1.2- 050618 734 (2.7- 1.8-) 050808 D74 0.2- 0.1+ 050829 699 0.0 0.3- 050618 G96 0.3+ 0.2+ 050808 D74 0.9- 0.6+ 050829 615 0.3- 0.7- 050618 G96 0.5+ 0.1- 050808 D74 0.4- 0.9+ 050829 615 0.1- 1.2- 050618 G96 0.7+ 0.3+ 050808 A79 (4.1- 2.6-) 050829 615 0.2+ 0.6+ 050618 G96 0.8+ 0.2+ 050809 A79 (3.0- 8.2-) 050830 615 0.1- 0.4- 050619 474 1.1- 0.2- 050811 673 0.2- 0.0 050830 615 0.1- 0.0 050619 474 0.7- 0.5- 050811 673 0.3+ 0.1+ 050830 615 0.5- 0.4+ 050619 474 1.4- 0.8- 050811 673 0.4+ 0.3+ 050905 703 0.1+ 1.3+ 050619 474 0.2- 1.8- 050811 673 0.3+ 0.1+ 050905 703 (2.9- 0.2-) 050630 G96 0.2- 0.4- 050817 673 0.2- 0.0 050905 703 1.6- 0.3+ 050630 G96 0.4- 0.5- 050817 673 0.0 0.8+ 050905 703 0.2+ 0.9- 050703 413 0.3+ 0.3- 050817 673 1.4- 0.1+ 050905 215 0.7- 0.4- 050703 413 0.1- 0.1- 050817 673 1.3+ 0.7+ 050906 415 0.6+ 0.0 050704 413 0.0 0.5- 050825 213 0.5- 1.6+ 050906 415 1.3+ 0.3+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2005 Sept. 11