Nakano Note (Nakano wa Kangaeru noda) NK 2299 P/2007 S1 (Zhao)

The following improved orbital elements, by S. Nakano, are from 72 observations 2007 Sept. 8 to Oct. 16. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.77 arc second. See the previous orbits on YC 2568 and HICQ 2008. Epoch = 2007 Dec. 6.0 TT T = 2007 Dec. 6.84121 +/- 0.16327 (m.e.) TT Peri. = 245.41894 +/- 0.04482 Node = 141.62331 +/- 0.00914 (2000.0) Inc. = 5.97381 +/- 0.00161 q = 2.4946206 +/- 0.0004299 AU e = 0.3434062 +/- 0.0000754 a = 3.7993361 +/- 0.0002070 AU n' = 0.13308911 +/- 0.00001088 P = 7.406 +/- 0.0006053 years (+/- 0.22 day) The predicted orbit for the 2015 return is as follows: T = 2015 May 10.49303 TT Epoch = 2015 May 18.0 TT Peri. = 245.77845 e = 0.3435478 Node = 141.52437 (2000.0) a = 3.7995755 AU Inc. = 5.97333 n'= 0.13307653 q = 2.4942398 AU P = 7.406 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2007/ 070921 D29 0.1- 0.7+ 071007 J47 0.3+ 0.6+ 070908 699 0.8+ 0.7+ 070921 D29 0.7+ 0.4- 071007 J47 0.3- 0.0 070908 699 0.8- 1.0+ 070921 D29 0.6- 0.6- 071007 J47 0.7- 1.0+ 070908 699 0.7+ 0.2+ 070921 349 0.9- 0.0 071009 D29 1.0- 0.3+ 070908 699 0.1+ 0.3- 070921 D29 0.8- 0.0 071009 D29 (2.2- 0.1-) 070915 699 0.2+ 0.2+ 070921 349 0.5- 0.7+ 071009 D29 1.0- 0.4- 070915 699 1.5- 0.1+ 070921 D29 0.3+ 0.9- 071009 D29 0.7- 0.7+ 070915 699 1.8- 0.2+ 070921 D29 0.6- 0.2- 071009 D29 1.5- 1.1- 070917 D29 0.3- 0.0 070921 D29 0.7- 0.2+ 071009 D29 0.5+ 0.7+ 070917 D29 0.3- 0.1+ 070921 D29 0.4+ 0.0 071009 D29 0.9- 0.8+ 070917 D29 0.4- 0.6+ 070921 585 (3.2- 0.2+) 071009 D29 0.4- 0.4+ 070917 D29 1.2+ 1.0- 070921 585 (2.1+ 1.9-) 071009 585 (3.0- 6.0+) 070919 473 0.1+ 0.4+ 070921 585 (3.2+ 0.9-) 071009 585 1.4+ 0.7+ 070919 473 0.3- 0.3+ 070921 585 (0.8+ 4.6-) 071009 585 0.0 1.0- 070919 473 0.4+ 0.5+ 070923 H55 1.0+ 1.9- 071010 355 1.2+ 0.8- 070919 204 1.8- 1.2+ 070923 H55 1.2+ 1.1- 071010 355 1.3+ 1.0- 070920 204 0.7+ 0.0 070923 H55 1.3+ 0.3- 071010 355 1.6+ 0.2- 070920 701 (2.0- 1.7-) 070924 291 1.7+ 0.6+ 071014 246 0.6+ 0.7+ 070920 701 0.6- 1.7- 070924 291 0.3- 0.2- 071014 246 0.2- 0.6+ 070920 701 (3.6+ 3.3+) 070924 291 0.8- 0.3- 071014 246 0.3+ 0.1- 070920 701 1.4- 0.5- 071001 585 (0.1+ 6.3-) 071014 246 0.3+ 0.9- 070920 H06 (2.3+ 0.2-) 071001 585 (0.4+ 6.5-) 071015 A77 0.2+ 0.5+ 070920 H06 1.5+ 0.3+ 071001 585 (2.2- 5.9-) 071015 A77 0.1- 0.3+ 070920 473 (2.7+ 0.1+) 071004 673 0.6+ 0.4- 071015 246 0.1+ 0.5+ 070920 235 0.1- 0.2+ 071004 673 0.8+ 0.4- 071015 246 0.2+ 0.5+ 070920 473 1.0+ 0.2+ 071004 673 0.2+ 0.0 071015 246 1.0- 0.8- 070920 235 0.3+ 0.2- 071004 673 0.3+ 0.4- 071015 246 0.2- 0.3- 070920 473 0.5+ 0.2+ 071005 213 0.8- 1.2+ 071016 A77 (1.5- 2.4+) 070920 235 1.1+ 1.2- 071005 213 0.6- 1.8+ 071016 A77 1.1- 1.2- ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 July 28

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