OAA computing section circular NK 1120 P/2004 C1 (Larsen)
The following improved orbital elements, by S. Nakano, are from 79 observations 2004 Jan. 23 to Apr. 11. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.68 arc second. Epoch = 2003 Mar. 22.0 TT T = 2003 Mar. 17.36187 +/- 0.16777 (m.e.) TT Peri. = 315.91485 +/- 0.02540 Node = 151.96219 +/- 0.00012 (2000.0) Inc. = 28.92852 +/- 0.00516 q = 4.3579774 +/- 0.0005209 AU e = 0.6143729 +/- 0.0002122 a = 11.3010155 +/- 0.0005631 AU n' = 0.02594346 +/- 0.00000194 P = 37.991 +/- 0.0028393 years (+/- 1.04 day) The predicted orbit for the 2043 return is as follows: T = 2043 June 3.11886 TT Epoch = 2043 May 31.0 TT Peri. = 317.24560 e = 0.6268270 Node = 151.50818 (2000.0) a = 11.6690997 AU Inc. = 28.55797 n'= 0.02472567 q = 4.3545926 AU P = 39.862 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2004/ 040214 673 1.1+ 0.4+ 040221 118 0.3+ 0.7+ 040123 699 0.9- 0.0 040214 673 0.9+ 0.4+ 040225 372 (2.3- 0.4-) 040123 699 1.3- 0.3- 040214 673 0.9+ 0.4+ 040227 372 0.1+ 0.5+ 040123 699 0.0 0.3- 040215 204 0.1- 0.1+ 040314 246 0.6- 0.2+ 040123 699 1.2+ 1.2+ 040215 204 0.2+ 0.2- 040314 246 0.6- 0.4- 040212 691 0.0 0.2- 040215 360 0.3- 0.1+ 040314 246 0.4- 0.2+ 040212 691 0.2+ 0.2+ 040215 360 0.3- 0.2+ 040314 246 0.8- 1.4+ 040212 691 0.1+ 0.3+ 040215 360 0.3- 0.2- 040314 246 0.3- 0.3- 040213 G90 0.5+ 1.2- 040216 372 1.1- 0.8+ 040315 360 1.7+ 0.6+ 040213 H36 1.9- 0.1+ 040217 493 0.3+ 0.4+ 040315 360 0.2- 0.3+ 040213 G90 0.2+ 0.4- 040217 493 0.4+ 0.4+ 040315 360 1.1+ 0.7+ 040213 H36 1.4+ 0.3- 040217 213 (2.2- 0.3-) 040317 691 0.9+ 1.2+ 040213 G90 1.0+ 0.0 040217 213 (2.3- 0.5-) 040317 691 0.1+ 0.3+ 040213 291 0.9- 0.0 040217 213 (2.8- 0.8-) 040317 691 0.5- 1.5- 040213 291 0.7- 0.2- 040217 213 (2.8- 0.8-) 040320 360 0.8+ 0.2+ 040213 H36 0.4+ 1.5- 040217 246 0.1+ 0.9- 040320 360 0.4- 0.5- 040213 291 0.6- 0.4- 040217 246 0.3- 0.4- 040320 360 0.1- 0.8- 040213 854 0.3- 0.8- 040217 246 0.2- 0.4- 040326 691 0.8+ 0.1+ 040213 854 0.3+ 0.6+ 040217 246 0.4+ 0.0 040326 691 0.6+ 0.5+ 040213 673 1.4+ 0.4- 040217 246 0.2- 0.4- 040326 691 0.0 0.4+ 040213 673 0.7+ 0.6- 040218 360 0.4+ 0.0 040326 360 0.1+ 1.5- 040213 673 0.2+ 0.1+ 040218 360 0.2- 0.3+ 040326 360 1.4- 1.1- 040213 673 1.9+ 0.0 040218 360 0.1+ 0.3+ 040326 360 0.5+ 0.8- 040213 213 (3.1- 1.7-) 040218 372 1.1- 0.8+ 040408 360 0.5- 0.1- 040213 213 (2.7- 1.0-) 040219 850 (2.3- 1.6-) 040408 360 0.2- 0.5+ 040213 176 0.5- 0.4+ 040219 850 1.0- 0.8+ 040408 360 0.7+ 0.4+ 040213 213 (2.2- 0.5+) 040219 850 0.3- 0.9- 040411 360 0.2- 0.3- 040213 176 0.4- 0.0 040219 850 (1.9+ 5.0+) 040411 360 0.5- 0.1- 040213 176 0.3- 0.3- 040220 372 1.5- 0.5+ 040411 360 0.0 0.3+ 040213 176 0.2- 0.5- 040220 215 (2.1- 0.8+) 040214 673 1.3+ 0.2+ 040221 118 1.5- 0.5+ ( ) -------- Rejected Obs.
Director, Computing Section Late edition Syuichi Nakano 2004 Apr. 24