OAA computing section circular NK 1629 P/2007 T4 (Gibbs)

The following improved orbital elements, by S. Nakano, are from 64 observations 2007 Oct. 12 to 2008 Apr. 25. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.70 arc second. See an orbit in NK 1569. Epoch = 2007 Aug. 8.0 TT T = 2007 July 20.72539 +/- 0.00107 (m.e.) TT Peri. = 42.51846 +/- 0.00073 Node = 37.22916 +/- 0.00027 (2000.0) Inc. = 23.87179 +/- 0.00003 q = 2.0088374 +/- 0.0000188 AU e = 0.6174233 +/- 0.0000280 a = 5.2508101 +/- 0.0000738 AU n' = 0.08191522 +/- 0.00000173 P = 12.032 +/- 0.0002537 years (+/- 0.09 day) The predicted orbit for the 2019 return is as follows: T = 2019 July 23.65091 TT Epoch = 2019 July 16.0 TT Peri. = 42.42395 e = 0.6180854 Node = 37.05886 (2000.0) a = 5.2499296 AU Inc. = 23.85877 n'= 0.08193583 q = 2.0050246 AU P = 12.029 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2007/ 071014 B15 0.5+ 0.1+ 071103 850 1.4- 0.2+ 071012 703 0.3+ 0.7- 071014 B15 0.2+ 0.2- 071107 734 0.0 0.5- 071012 703 0.2- 0.0 071014 G96 0.3- 0.2+ 071107 734 0.8+ 0.7- 071012 703 0.2+ 0.0 071014 G96 0.4- 0.4+ 071107 734 0.2- 0.6+ 071012 703 1.0- 0.3+ 071014 G96 0.1+ 0.1- 071113 703 1.3+ 0.7+ 071012 703 0.2+ 1.3- 071014 G96 0.7- 0.9+ 071113 703 0.6- 0.3+ 071012 703 0.3- 0.7+ 071014 673 1.6+ 1.1- 071113 703 1.2- 0.2+ 071012 703 0.1- 0.5- 071014 673 0.4+ 1.2- 071117 213 0.9- 1.3+ 071012 703 1.1+ 0.0 071015 G96 0.4- 0.4+ 071117 213 0.6- 0.5+ 071012 703 0.6- 0.2+ 071015 G96 0.2+ 0.2- 071117 213 0.9- 0.5+ 071012 703 0.3+ 0.5+ 071015 G96 0.2+ 0.2- 071231 349 0.5+ 0.7- 071012 703 1.5- 0.9+ 071015 G96 1.0- 0.5+ 071231 349 0.9+ 0.4- 071012 703 1.5- 0.3+ 071015 673 0.2- 0.5- 2008/ 071013 703 0.8+ 0.9+ 071015 673 1.1+ 0.8- 080101 349 0.3- 0.8- 071013 703 0.8+ 0.7+ 071015 673 0.7+ 1.0- 080101 349 0.1+ 0.6- 071013 703 0.4+ 0.6+ 071015 673 0.6+ 0.6- 080208 215 0.6+ 0.1- 071013 703 0.9+ 0.2+ 071016 204 0.6+ 0.5- 080212 204 0.5- 0.7- 071013 703 0.9- 1.1+ 071022 204 0.0 0.4+ 080212 204 0.2- 0.0 071013 703 0.4- 1.1+ 071023 734 0.6+ 0.1- 080404 204 0.3- 0.3+ 071013 703 1.9- 0.6+ 071023 734 1.0+ 0.8- 080404 204 0.8- 0.0 071013 703 0.6- 0.3+ 071023 734 0.2+ 0.8- 080425 G96 0.9+ 0.9+ 071014 B15 0.5+ 0.4- 071103 850 1.2+ 0.8- 080425 G96 0.2- 0.5+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2008 May 30

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