Nakano Note (Nakano wa Kangaeru noda) NK 1774 C/1999 X3 = 2004 E2 = 2008 K10 (SOHO)

The following improved orbital elements, by S. Nakano, are from 25 observations 1999 to 2008. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 5.27 arc seconds. Epoch = 2008 May 14.0 TT T = 2008 May 31.33195 +/- 0.00153 (m.e.) TT Peri. = 353.61000 +/- 0.11637 Node = 323.65090 +/- 0.11585 (2000.0) Inc. = 6.28107 +/- 0.02684 q = 0.0478637 +/- 0.0000784 AU e = 0.9816649 +/- 0.0000300 a = 2.6104950 +/- 0.0023171 AU n' = 0.23367905 +/- 0.00031112 P = 4.218 +/- 0.0056157 years (+/- 2.05 days) T = 1999 Dec. 12.87723 TT Epoch = 1999 Dec. 8.0 TT Peri. = 353.23602 e = 0.9801738 Node = 323.86935 (2000.0) a = 2.6251703 AU Inc. = 6.08721 n'= 0.23172231 q = 0.0520470 AU P = 4.253 years T = 2004 Mar. 12.32674 TT Epoch = 2004 Mar. 16.0 TT Peri. = 353.56654 e = 0.9815261 Node = 323.67472 (2000.0) a = 2.6117423 AU Inc. = 6.25013 n'= 0.23351167 q = 0.0482489 AU P = 4.221 years The predicted orbit for the 2012 return is as follows: T = 2012 Aug. 20.17786 TT Epoch = 2012 Aug. 21.0 TT Peri. = 353.58143 e = 0.9814662 Node = 323.67021 (2000.0) a = 2.6121164 AU Inc. = 6.24036 n'= 0.23346150 q = 0.0484124 AU P = 4.222 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1999/ 040312 249(46.4- 30.0-)Y 080530 249 2.8+ 5.0- Y 991212 249 1.1+ 5.8- Y 040312 249 5.5- 4.3+ Y 080530 249 0.1+ 1.9- Y 991212 249 6.8+ 6.5+ Y 040312 249 7.9+ 13.5+ Y 080530 249 0.4- 0.3- Y 991212 249 5.1- 4.5+ Y 040312 249(21.9- 14.6-)Y 080530 249 0.9+ 1.2- Y 991212 249 2.3- 1.1+ Y 040312 249 3.2- 12.8- Y 080530 249 0.7+ 1.4- Y 991212 249 2.5+ 2.9+ Y 040312 249 7.9+ 6.1- Y 080530 249 3.4+ 5.5- Y 991212 249 5.0- 8.1+ Y 040312 249(10.3+ 15.8+)Y 080531 249 2.6+ 5.5- Y 991212 249 0.9+ 1.9+ Y 040312 249 7.3- 1.4+ Y 080531 249 4.0- 0.3+ Y 991212 249 10.1+ 6.0- Y 2008/ 080531 249 1.5+ 2.0- Y 991212 249 8.7- 0.2+ Y 080530 249 8.6- 3.7+ Y 2004/ 080530 249 1.4+ 5.3+ Y ( ) -------- Rejected Obs.

Managing Director of the Oriental Astronomical Association Late edition Syuichi Nakano 2008 Sept. 30

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