OAA computing section circular NK 1251 P/2004 X1 (LINEAR)

The following improved orbital elements, by S. Nakano, are from 86 observations 2004 Dec. 7 to 2005 Feb. 6. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.71 arc second. See orbits on YC 2451 and YC 2452. Epoch = 2004 Nov. 11.0 TT T = 2004 Nov. 1.92563 +/- 0.00230 (m.e.) TT Peri. = 345.44725 +/- 0.00472 Node = 7.14113 +/- 0.00267 (2000.0) Inc. = 5.14153 +/- 0.00014 q = 0.7824320 +/- 0.0000135 AU e = 0.7265763 +/- 0.0000742 a = 2.8616097 +/- 0.0002719 AU n' = 0.20360501 +/- 0.00002901 P = 4.841 +/- 0.0006898 years (+/- 0.25 day) The predicted orbit for the 2009 return is as follows: T = 2009 Sept. 3.32892 TT Epoch = 2009 Sept. 6.0 TT Peri. = 345.44513 e = 0.7272896 Node = 7.11532 (2000.0) a = 2.8609378 AU Inc. = 5.14812 n'= 0.20367675 q = 0.7802075 AU P = 4.839 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2004/ 041211 599 1.4+ 1.2+ 041215 246 0.1- 0.1+ 041207 704 (3.1+ 1.3-) 041211 599 0.2- 0.1- 041215 246 0.2- 0.1+ 041207 704 (0.3+ 3.0-) 041212 704 0.9+ 1.1+ 041215 246 0.6- 0.0 041207 704 1.8+ 0.3+ 041212 704 0.6+ 1.4- 041219 J95 0.8+ 0.4+ 041207 704 (1.5+ 2.4+) 041212 704 0.1+ 0.3+ 041219 J95 (2.3+ 1.2-) 041209 703 1.3+ 0.2- 041212 704 0.7- 0.1+ 041222 213 0.7- 0.2+ 041209 703 0.6+ 0.1- 041212 704 (3.8+ 0.2+) 041222 213 1.1- 0.3+ 041209 703 0.1- 0.5- 041212 704 0.8+ 0.2+ 041222 213 0.9- 0.1+ 041209 703 1.3- 1.7- 041212 704 0.2- 0.8- 041227 213 1.9+ 0.5- 041209 246 0.8+ 0.0 041212 704 0.5- 0.3- 041227 213 1.5+ 0.5- 041209 246 0.8- 0.8- 041212 246 0.6- 1.6+ 041230 349 1.8+ 0.5+ 041209 246 0.0 0.6+ 041212 246 0.6- 0.7- 041230 349 0.3- 0.1+ 041209 246 0.7- 0.0 041212 246 0.8- 0.1+ 041230 349 0.6- 0.5+ 041209 246 0.7- 0.4- 041212 246 0.6- 0.1- 041231 104 1.2+ 1.5+ 041209 246 1.3- 0.4- 041212 246 0.1+ 0.4+ 041231 104 0.4+ 0.2+ 041209 246 0.6- 0.4- 041212 246 0.8+ 0.5+ 041231 104 1.0+ 1.7- 041209 246 0.8- 0.2- 041212 104 0.2- 0.3- 2005/ 041210 704 (2.4+ 1.6+) 041212 104 0.0 1.2- 050101 J87 0.2- 0.7- 041210 704 1.4+ 1.3+ 041212 104 1.0- 0.6- 050101 J87 0.6- 0.5+ 041210 704 1.1+ 1.5+ 041212 104 0.0 0.4+ 050101 J87 0.1+ 0.0 041210 448 0.2+ 0.4- 041213 246 0.3+ 0.6+ 050107 704 (2.5- 1.4+) 041210 448 0.2+ 0.5- 041213 246 0.1+ 0.1+ 050107 704 (0.9+ 2.6+) 041210 704 0.6+ 1.0+ 041213 246 0.3+ 0.3+ 050107 704 1.4- 0.6+ 041210 448 0.0 0.5- 041213 246 0.1+ 1.0+ 050107 704 1.2- 0.9- 041210 704 0.1- 0.2+ 041213 246 0.3- 0.3+ 050109 213 0.1+ 0.7- 041211 246 0.1+ 0.4- 041213 246 1.1+ 0.2+ 050109 213 0.1- 0.6- 041211 246 0.3+ 1.1- 041214 215 0.4- 0.3- 050109 213 0.6- 0.0 041211 246 0.3+ 0.9- 041215 246 1.1- 0.4+ 050111 118 0.3+ 0.3+ 041211 246 0.7- 0.4- 041215 246 0.4- 0.3+ 050111 118 0.4- 0.1+ 041211 130 0.6+ 0.2- 041215 246 0.1+ 1.0+ 050111 118 0.0 0.1- 041211 599 0.6+ 0.1- 041215 246 1.1- 0.4+ 050206 118 0.4+ 0.2+ 041211 599 0.5- 0.8- 041215 246 0.7- 0.8+ 050206 118 0.0 0.3- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2005 Oct. 21

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