Nakano Note (Nakano wa Kangaeru noda) NK 2206 P/2011 U2 (Bressi)
The following improved orbital elements, by S. Nakano, are from 98 observations 2011 Oct. 24 to 2012 Jan. 16. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.48 arc second. Epoch = 2012 Apr. 23.0 TT T = 2012 May 5.98415 +/- 1.13929 (m.e.) TT Peri. = 157.58306 +/- 0.11170 Node = 266.69189 +/- 0.00291 (2000.0) Inc. = 9.63031 +/- 0.00067 q = 4.8378683 +/- 0.0004475 AU e = 0.1107508 +/- 0.0001299 a = 5.4403966 +/- 0.0001726 AU n' = 0.07767088 +/- 0.00000372 P = 12.690 +/- 0.0006031 years (+/- 0.22 day) The predicted orbit for the 2023 return is as follows: T = 2023 Oct. 31.81579 TT Epoch = 2023 Oct. 23.0 TT Peri. = 169.11718 e = 0.1274618 Node = 260.05907 (2000.0) a = 4.7356157 AU Inc. = 9.79713 n'= 0.09563996 q = 4.1320055 AU P = 10.305 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2011/ 111028 J01 0.4+ 0.5- 111118 157 0.3+ 0.1+ 111024 691 0.7- 0.2- 111028 J01 0.0 0.4- 111118 157 0.7+ 0.1- 111024 691 1.9- 0.4- 111028 J01 0.2- 0.4- 111118 C32 0.3+ 0.5+ 111024 691 0.9- 0.1- 111029 204 0.3+ 0.2- 111118 C32 0.3+ 0.5+ 111024 291 0.1+ 0.1+ 111029 204 0.5+ 0.1- 111118 C32 0.1+ 0.3+ 111024 291 0.3+ 0.0 111029 H06 0.1- 0.1- 111118 C32 0.1+ 0.3+ 111024 291 0.2+ 0.3+ 111029 H06 0.2+ 0.2+ 111121 215 0.4+ 0.2- 111024 B18 0.7+ 0.2+ 111029 H06 0.4+ 0.1+ 111121 215 0.1+ 0.2- 111024 B18 0.2+ 0.5+ 111029 157 0.2- 0.0 111121 215 0.0 0.4- 111024 B18 0.1+ 0.1+ 111029 157 0.2- 0.4- 111121 130 0.6- 0.2- 111025 291 0.2+ 0.1+ 111031 H06 0.1+ 0.3+ 111121 130 0.2+ 0.4- 111025 291 0.4+ 0.2+ 111031 H06 0.1- 0.2+ 111121 130 0.0 0.1+ 111025 291 0.3+ 0.1+ 111031 H06 0.5- 0.1+ 111122 372 0.6+ 0.6+ 111025 F65 0.7+ 0.1+ 111031 D29 0.2+ 0.1+ 111122 372 0.3- 0.4- 111025 F65 0.9+ 0.5+ 111031 D29 0.3- 0.3+ 111122 372 0.2- 0.6- 111025 D90 0.6- 0.5- 111031 D29 0.0 0.3- 111122 372 0.4+ 0.6+ 111025 D90 0.9- 0.6- 111101 H06 0.3- 0.4+ 111123 703 0.1- 0.6+ 111025 D90 0.2- 0.0 111101 H06 0.5- 0.1+ 111123 703 1.9- 0.9+ 111025 B18 0.9- 0.3- 111101 H06 0.2- 0.4+ 111123 703 1.3- 0.6+ 111025 B18 0.7- 0.5- 111102 H06 0.0 0.2+ 111123 703 (0.3- 2.3+) 111025 B18 0.2- 0.2- 111102 H06 0.0 0.0 111124 H06 0.1+ 0.1- 111026 291 0.3+ 0.1+ 111104 291 0.3+ 0.2+ 111124 H06 0.2+ 0.2- 111026 291 0.5+ 0.0 111104 291 0.0 0.5+ 111124 H06 0.4+ 0.2- 111026 291 0.6+ 0.3+ 111104 291 0.1+ 0.1- 111126 349 0.2+ 0.6- 111026 H06 0.2+ 0.1- 111115 703 0.4+ 0.2- 111126 349 0.8+ 1.0- 111026 H06 0.3+ 0.2- 111115 703 0.3- 0.9- 111224 349 0.5+ 0.2- 111026 H06 0.4+ 0.3- 111115 703 1.5- 0.4- 111224 349 0.9+ 0.5+ 111027 B82 0.6+ 0.5+ 111115 703 1.1- 0.5- 111229 J01 0.1+ 0.6- 111027 B82 0.1+ 0.2- 111117 291 0.8+ 0.6+ 111229 J01 0.6- 0.1- 111027 B82 0.1+ 0.5+ 111117 291 0.7+ 0.2+ 111229 J01 0.0 0.3+ 111027 C32 0.3- 0.5- 111117 291 0.5+ 0.3+ 2012/ 111027 C32 0.4+ 0.4- 111117 704 0.3- 0.5+ 120116 204 0.1- 0.2- 111027 C32 0.2+ 0.2- 111117 704 0.2+ 0.0 120116 204 0.2- 0.1- 111027 C32 0.3+ 0.3- 111117 704 1.6- 1.0+ ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 Feb. 7