Nakano Note (Nakano wa Kangaeru noda) NK 2305 P/2010 B2 (WISE)

The following improved orbital elements, by S. Nakano, are from 48 observations 2010 Jan, 22 to Apr. 7. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.38 arc second. Epoch = 2010 Jan. 4.0 TT T = 2009 Dec. 21.91176 +/- 0.00092 (m.e.) TT Peri. = 156.04593 +/- 0.00053 Node = 0.87307 +/- 0.00029 (2000.0) Inc. = 8.93132 +/- 0.00011 q = 1.6164325 +/- 0.0000107 AU e = 0.4802989 +/- 0.0000314 a = 3.1103120 +/- 0.0000608 AU n' = 0.17967934 +/- 0.00000527 P = 5.485 +/- 0.0001610 years (+/- 0.06 day) The predicted orbit for the 2015 return is as follows: T = 2015 June 13.61376 TT Epoch = 2015 June 27.0 TT Peri. = 155.95006 e = 0.4812095 Node = 0.85240 (2000.0) a = 3.1071396 AU Inc. = 8.93841 n'= 0.17995459 q = 1.6119544 AU P = 5.477 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2010/ 100207 568 0.0 0.0 100220 568 0.1- 0.0 100122 C51 0.5- 0.5- 100207 568 0.0 0.0 100313 D90 0.5- 0.1+ 100122 C51 0.1- 1.1- 100207 568 0.0 0.0 100313 D90 0.4- 0.7+ 100122 C51 0.6- 0.8- 100208 291 0.7- 0.3+ 100313 D90 0.4- 0.7+ 100123 C51 0.7- 0.4- 100208 291 0.5- 0.1+ 100317 H06 0.5+ 0.2+ 100123 C51 0.6- 0.4+ 100208 291 0.3+ 0.3- 100317 H06 0.2- 0.6+ 100123 C51 0.4+ 0.1+ 100208 568 0.2+ 0.1- 100319 A79 1.4- 0.9+ 100123 C51 0.4- 0.1- 100208 568 0.2+ 0.1- 100319 A79 1.1- 0.9- 100123 C51 0.5- 0.3+ 100208 568 0.2+ 0.0 100321 I33 0.7+ 0.0 100123 C51 0.1+ 0.2+ 100212 H06 1.0- 0.4- 100321 I33 0.6+ 0.0 100123 C51 0.7- 0.4+ 100212 H06 0.4- 0.2- 100321 I33 0.9+ 0.2- 100123 C51 0.4+ 0.4+ 100212 H06 0.5+ 0.4+ 100321 I33 0.5+ 0.3- 100124 C51 0.5+ 0.1- 100213 204 0.3- 0.6+ 100407 E85 0.3- 0.1+ 100124 C51 0.1+ 1.1+ 100213 204 0.5- 0.1- 100407 E85 0.2- 0.3- 100207 H21 0.9+ 0.5- 100220 E85 (2.9- 0.9-) 100407 E85 0.0 0.4- 100207 H21 0.5+ 0.2+ 100220 E85 0.7- 0.3+ 100407 E85 0.7+ 0.4- 100207 H21 0.3+ 0.9+ 100220 568 0.0 0.0 ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 July 29

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