OAA computing section circular NK 1227 P/2004 F1 (NEAT)
The following improved orbital elements, by S. Nakano, are from 59 observations 2003 Dec. 1 to 2004 Apr. 21. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.56 arc second. See an orbit on YC 2422. Epoch = 2003 Oct. 8.0 TT T = 2003 Oct. 19.78706 +/- 0.00867 (m.e.) TT Peri. = 26.37012 +/- 0.00341 Node = 111.91118 +/- 0.00056 (2000.0) Inc. = 18.27201 +/- 0.00013 q = 2.4507239 +/- 0.0000292 AU e = 0.4515783 +/- 0.0000272 a = 4.4686850 +/- 0.0000511 AU n' = 0.10433607 +/- 0.00000179 P = 9.446 +/- 0.0001619 years (+/- 0.06 day) The predicted orbit for the 2013 return is as follows: T = 2013 Feb. 27.74807 TT Epoch = 2013 Mar. 9.0 TT Peri. = 27.87797 e = 0.4557972 Node = 109.50274 (2000.0) a = 4.4411069 AU Inc. = 18.10144 n'= 0.10530942 q = 2.4168627 AU P = 9.359 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2003/ 040318 246 0.7+ 0.5- 040320 213 0.5- 1.5- 031201 704 0.6- 1.1- 040318 246 0.4+ 0.0 040326 360 0.1- 0.3+ 031201 704 0.4- 0.1+ 040318 J87 0.4+ 0.7+ 040326 372 0.6- 0.0 031201 704 1.0+ 0.3+ 040319 J87 0.4+ 0.5+ 040326 360 0.5- 0.4- 2004/ 040319 J87 0.2+ 0.1+ 040326 360 0.0 0.1- 040216 704 0.2- 0.0 040319 926 0.5+ 0.8- 040408 360 0.5- 0.3+ 040216 704 (2.1+ 2.2+) 040319 926 0.5+ 0.4+ 040408 360 0.5- 0.2- 040216 704 0.5- 0.9+ 040319 926 0.1- 0.6+ 040408 360 0.2+ 0.5+ 040216 704 0.6- 1.0+ 040319 673 0.3+ 0.2- 040409 213 0.3+ 0.5- 040216 704 0.3- 0.0 040319 649 0.4- 0.5- 040411 360 0.1- 0.0 040314 704 1.5+ 0.2+ 040319 673 0.3+ 0.0 040411 360 0.5+ 0.0 040314 704 1.8+ 0.0 040319 673 0.5+ 0.1+ 040411 360 0.3+ 0.2+ 040314 704 (2.2+ 0.3-) 040319 649 0.5- 0.3- 040414 215 1.2- 0.0 040314 704 (2.1- 1.8+) 040319 673 0.4+ 0.2- 040415 850 0.1+ 0.0 040318 703 1.0- 0.3- 040319 649 0.2- 0.3- 040415 850 0.3+ 0.1+ 040318 644 0.4+ 0.4+ 040319 649 0.0 0.4- 040415 850 1.6- 0.8+ 040318 703 1.1- 0.8+ 040319 649 0.4- 0.5- 040420 360 0.2- 0.7- 040318 644 0.5+ 0.0 040319 946 0.2+ 0.0 040420 360 0.0 0.1- 040318 703 1.2- 0.4- 040319 946 0.8- 0.3- 040420 360 0.0 0.4+ 040318 703 (0.2- 2.1-) 040320 360 0.5+ 0.7+ 040421 204 0.0 0.2+ 040318 644 0.4+ 0.0 040320 360 0.1- 0.7+ 040421 204 1.2+ 0.1- 040318 246 0.4+ 0.4- 040320 360 0.1+ 0.4- ( ) -------- Rejected Obs.
Director, Computing Section Late edition Syuichi Nakano 2004 June 2