OAA computing section circular NK 1667 C/1999 S2 (McNaught-Watson)

The following improved orbital elements, by S. Nakano, are from 83 observations 1999 Sept. 19 to 2002 Feb. 16. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.66 arc second. See orbits in NK 747 and on MPC 43758. Epoch = 1997 Nov. 8.0 TT T = 1997 Nov. 22.52078 +/- 0.00931 (m.e.) TT Peri. = 223.47565 +/- 0.00094 Node = 74.42730 +/- 0.00014 (2000.0) Inc. = 65.81310 +/- 0.00004 q = 6.4665953 +/- 0.0000773 AU e = 1.0072289 +/- 0.0000331 1/a = -0.0011179 +/- 0.0000051 1/AU origin = +0.000050 (Q= 8) future = -0.000328 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1999/ 991002 834 (2.4+ 0.7-) 000205 428 0.3- 0.8+ 990919 413 1.4- 1.5- 991004 834 1.6- 1.1- 000205 428 (0.4- 2.1+) 990919 413 0.4- 1.2+ 991004 834 1.0+ 0.1+ 000228 413 0.3+ 0.2+ 990921 413 0.1- 0.1- 991004 428 0.4+ 1.0+ 000228 413 0.1+ 0.3- 990921 413 0.1- 0.0 991004 428 1.1+ 0.5+ 000228 413 0.7+ 0.2- 990921 413 0.2- 0.0 991005 413 0.1- 0.1+ 000305 474 0.8- 0.8+ 990921 413 0.2- 0.0 991005 413 0.1- 0.4+ 000305 474 0.3+ 0.7+ 990921 428 0.3- 0.5+ 991005 413 0.0 0.2+ 000305 474 0.0 0.0 990921 428 0.0 0.6- 991011 428 0.3- 1.0+ 000727 474 0.5- 1.1- 990922 467 1.1+ 0.5- 991011 428 0.4+ 0.6- 000727 474 0.7- 0.3- 990922 467 0.8- 0.1- 991015 467 0.7+ 1.2- 001027 428 0.3+ 0.0 990922 467 1.1+ 0.6- 991015 467 0.3- 1.0- 001027 428 0.4- 0.4+ 990922 467 0.3+ 0.5+ 991015 467 0.9- 0.1+ 001222 428 0.3+ 0.6- 990923 467 (1.0- 2.0+) 991015 413 0.2+ 0.1- 001222 428 0.0 0.1- 990923 467 0.6+ 0.8+ 991015 413 0.4+ 0.3+ 2001/ 990923 467 1.7+ 0.9+ 991016 413 0.0 0.1+ 010129 320 0.7+ 0.2+ 990923 428 0.2- 0.1+ 991016 413 0.0 0.2+ 010129 320 0.1+ 1.7+ 990923 428 0.5- 0.1- 991016 413 0.0 0.3+ 010129 320 (1.6+ 4.4+) 990923 428 0.3- 0.3- 991017 413 0.1+ 0.4+ 010130 320 (2.5+ 2.2-) 990924 428 0.4+ 0.4+ 991017 413 0.0 0.2+ 010130 320 (1.7+ 6.2+) 990924 428 0.8+ 0.5+ 991019 428 0.6- 0.1- 010619 320 (3.4+ 2.6-) 990924 428 0.3+ 0.0 991019 428 0.1+ 0.4- 010619 320 0.8+ 1.8- 990927 834 0.1- 1.5- 991107 428 0.6- 0.4+ 010619 320 (2.5- 2.5-) 990927 834 0.9- 0.0 991110 322 (0.5- 3.4-) 010619 320 (4.9+ 8.7-) 990927 834 0.1- 0.1+ 991110 322 (2.5+ 3.1-) 011014 360 0.7+ 1.6- 990927 834 0.5+ 1.7+ 991110 474 0.1- 0.9- 011014 360 0.9- 1.6- 990928 413 0.1- 0.2- 991110 474 0.7- 1.1- 011014 360 (1.2+ 2.4-) 990928 413 0.0 0.2- 991110 474 0.5- 0.6- 011215 474 0.1+ 1.0+ 990928 413 0.2- 0.4- 991115 474 0.1+ 0.5- 011215 474 0.8- 0.5- 990928 413 0.6- 0.5- 991115 474 0.2- 1.0- 011215 474 0.1+ 0.6+ 990930 834 0.0 1.3+ 991122 322 (0.2+ 4.2-) 011215 474 0.6- 1.1+ 990930 428 0.1+ 1.0+ 991122 322 (1.3- 2.1-) 2002/ 990930 428 0.4+ 0.1+ 991205 428 (3.2+ 0.3-) 020216 474 0.7+ 0.6+ 991002 834 0.2+ 0.3- 2000/ 020216 474 0.3+ 0.9+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2008 Sept. 3

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