OAA computing section circular NK 1148 P/1997 C1 (Gehrels)

The following improved orbital elements, by S. Nakano, are from 156 observations 1997 Feb. 1 to 1998 Feb. 2. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.69 arc second. Epoch = 1996 Feb. 7.0 TT T = 1996 Jan. 29.22036 +/- 0.00543 (m.e.) TT Peri. = 211.34395 +/- 0.00322 Node = 225.92070 +/- 0.00232 (2000.0) Inc. = 2.86787 +/- 0.00002 q = 3.5650897 +/- 0.0000820 AU e = 0.4688641 +/- 0.0000166 a = 6.7121988 +/- 0.0000388 AU n' = 0.05667700 +/- 0.00000049 P = 17.390 +/- 0.0001507 years (+/- 0.06 day) The predicted orbit for the 2013 return is as follows: T = 2013 July 8.67847 TT Epoch = 2013 July 7.0 TT Peri. = 210.93530 e = 0.4749796 Node = 225.29181 (2000.0) a = 6.8597293 AU Inc. = 2.85497 n'= 0.05485846 q = 3.6014979 AU P = 17.966 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1997/ 970204 360 0.7+ 0.8- 970301 402 0.0 0.2+ 970201 691 (2.6- 0.1-) 970204 360 0.6+ 0.2- 970301 402 0.4- 1.6+ 970201 691 1.8- 0.4- 970205 402 0.3+ 0.1- 970301 402 0.4- 0.3- 970201 691 1.8- 0.4- 970205 402 1.0+ 1.0- 970301 360 0.1- 0.5+ 970202 046 0.7- 0.2- 970205 402 0.6+ 0.6- 970301 360 0.2+ 0.4+ 970202 046 0.4- 0.5- 970206 683 0.6+ 0.5+ 970301 360 0.5- 0.2+ 970202 046 0.4+ 0.4- 970206 683 0.9+ 0.6+ 970302 046 1.5- 0.6+ 970202 046 0.2- 0.1+ 970206 683 0.8+ 0.6+ 970302 046 1.3- 0.6+ 970202 046 1.0- 0.2- 970206 385 0.2- 0.4+ 970303 557 0.1+ 0.3+ 970202 046 0.5+ 0.4- 970206 385 0.0 0.1+ 970303 557 0.1+ 0.1+ 970202 046 0.4+ 0.7- 970206 596 0.2+ 0.5- 970305 360 0.8+ 0.0 970202 046 1.0- 0.3- 970206 596 0.7+ 1.0+ 970305 360 0.3+ 0.1- 970202 709 0.1+ 0.7- 970206 596 0.8+ 0.3+ 970305 360 0.6+ 0.0 970202 709 0.2+ 0.8- 970206 596 1.5+ 0.4+ 970305 402 0.3+ 0.9+ 970202 709 0.2+ 0.4- 970206 046 0.7+ 0.3+ 970305 402 1.1+ 0.3- 970202 709 0.5+ 0.5- 970206 046 0.8+ 0.4+ 970305 867 0.5+ 0.1+ 970202 709 0.2+ 0.5- 970206 046 1.4+ 0.6+ 970305 867 0.3+ 0.2+ 970202 709 0.2+ 0.6- 970207 683 0.2+ 1.1+ 970305 867 0.2+ 0.0 970202 709 0.5+ 0.4- 970207 683 0.2+ 1.0+ 970307 360 0.7+ 0.4- 970202 367 0.4- 0.0 970207 683 0.5+ 0.8+ 970307 360 0.7+ 0.1- 970202 367 1.4- 1.3- 970207 691 (2.1- 0.0 ) 970307 360 1.0+ 0.4- 970202 327 (2.5- 1.7-) 970207 691 1.6- 0.1+ 970311 402 0.2+ 0.0 970202 327 (1.9- 2.1-) 970207 691 1.7- 0.2+ 970311 402 1.1+ 0.3+ 970202 327 (1.3- 2.3-) 970207 596 (2.9+ 0.9+) 970311 402 0.3- 1.0+ 970202 327 1.8- 1.3- 970207 596 0.3- 1.0+ 970315 691 1.1+ 0.2- 970202 046 0.2+ 0.1- 970207 596 0.9+ 0.7- 970315 691 0.9+ 0.1- 970202 046 0.5- 0.0 970209 360 0.9+ 0.0 970315 691 0.8+ 0.3- 970202 046 1.0+ 0.5- 970209 360 0.8+ 0.1+ 970330 587 0.7- 1.0+ 970202 540 (2.9- 1.4+) 970209 360 0.8+ 0.2+ 970330 587 0.2- 1.6+ 970202 540 1.5- 0.0 970209 402 0.3+ 0.2+ 970331 360 0.1+ 0.0 970202 540 0.6- 0.3+ 970209 402 0.2+ 0.3+ 970331 360 0.2- 0.2+ 970202 966 1.1- 0.1- 970210 046 0.0 0.9+ 970331 360 0.7- 0.4- 970202 966 (2.3- 2.4+) 970210 046 0.1+ 0.3+ 970331 867 0.5- 0.4- 970203 966 1.1- 0.5+ 970210 046 0.2- 0.2+ 970331 867 0.8- 0.2+ 970203 966 0.8+ 1.9+ 970211 691 0.4+ 0.4- 970331 867 1.0- 0.4+ 970203 118 0.4- 0.2- 970211 691 0.5+ 0.0 970401 587 1.1- 0.7+ 970203 691 0.8+ 0.9- 970211 691 0.3+ 0.1- 970501 691 0.1+ 0.6- 970203 691 0.9+ 1.0- 970211 385 0.7- 0.9+ 970501 691 0.1+ 0.1- 970203 691 0.7+ 1.4- 970211 385 1.7- 0.1+ 970504 360 1.1+ 0.0 970203 897 0.8- 1.4+ 970211 897 1.1- 0.5- 970504 360 1.2+ 0.7- 970203 897 0.5+ 0.5- 970211 897 0.1- 1.1+ 970504 360 0.1- 0.6- 970203 897 0.4- 0.2+ 970211 897 1.0- 0.1+ 970607 691 1.1- 0.5+ 970203 355 0.3+ 0.6+ 970213 402 0.6+ 0.3+ 970607 691 0.8- 0.4+ 970203 355 0.6- 0.9- 970213 402 0.2- 1.1+ 970607 691 0.2+ 0.2- 970203 557 0.2+ 0.3- 970215 691 0.1+ 0.7- 970614 691 0.3- 0.5+ 970203 557 0.0 0.6- 970215 691 0.1+ 0.7- 970614 691 1.5+ 0.1+ 970203 557 0.3- 0.7- 970215 691 0.1- 0.8- 970614 691 0.5- 0.7- 970203 557 0.1+ 0.4- 970223 658 0.7- 0.4- 971231 691 1.1+ 0.2+ 970204 897 1.3- 0.7+ 970223 658 0.1- 1.3- 971231 691 1.0- 0.1- 970204 897 0.4+ 0.8+ 970223 658 0.2- 0.1- 971231 691 1.6+ 0.7+ 970204 327 1.1+ 0.4+ 970224 658 0.3- 0.2+ 1998/ 970204 327 0.4- 0.1+ 970224 658 0.5- 0.4- 980202 691 1.2- 0.1+ 970204 327 0.6- 0.0 970224 658 0.0 0.3- 980202 691 0.9- 1.4- 970204 327 0.4+ 0.3+ 970224 360 0.0 0.8- 980202 691 0.4+ 0.2- 970204 897 1.4- 0.0 970224 360 0.5+ 0.0 970204 360 0.4+ 0.2- 970224 360 0.3- 0.2- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2005 Jan. 5

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