Nakano Note (Nakano wa Kangaeru noda) NK 2254 P/2011 U2 (Bressi)
The following improved orbital elements, by S. Nakano, are from 105 observations 2011 Oct. 24 to 2012 Mar. 16. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.50 arc second. See an orbit in NK 2206. Epoch = 2012 Apr. 23.0 TT T = 2012 May 6.48210 +/- 0.58197 (m.e.) TT Peri. = 157.63142 +/- 0.05729 Node = 266.69338 +/- 0.00107 (2000.0) Inc. = 9.62996 +/- 0.00023 q = 4.8376453 +/- 0.0001258 AU e = 0.1108122 +/- 0.0000354 a = 5.4405214 +/- 0.0000475 AU n' = 0.07766821 +/- 0.00000102 P = 12.690 +/- 0.0001663 years (+/- 0.06 day) The predicted orbit for the 2023 return is as follows: T = 2023 Nov. 1.80283 TT Epoch = 2023 Oct. 23.0 TT Peri. = 169.19777 e = 0.1275284 Node = 260.05136 (2000.0) a = 4.7357637 AU Inc. = 9.79535 n'= 0.09563548 q = 4.1318194 AU P = 10.306 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 0.2- 0.4- 111118 157 0.6+ 0.1- 111024 691 0.7- 0.2- 111029 204 0.3+ 0.2- 111118 C32 0.3+ 0.5+ 111024 691 1.9- 0.3- 111029 204 0.5+ 0.1- 111118 C32 0.3+ 0.5+ 111024 691 0.9- 0.1- 111029 H06 0.1- 0.0 111118 C32 0.1+ 0.3+ 111024 291 0.1+ 0.2+ 111029 H06 0.2+ 0.2+ 111118 C32 0.1+ 0.3+ 111024 291 0.3+ 0.1+ 111029 H06 0.4+ 0.1+ 111121 215 0.3+ 0.2- 111024 291 0.1+ 0.4+ 111029 157 0.2- 0.0 111121 215 0.1+ 0.2- 111024 B18 0.7+ 0.2+ 111029 157 0.2- 0.3- 111121 215 0.0 0.4- 111024 B18 0.2+ 0.6+ 111030 D29 1.7+ 0.4- 111121 130 0.6- 0.2- 111024 B18 0.0 0.1+ 111030 D29 0.9+ 0.7- 111121 130 0.2+ 0.4- 111025 291 0.2+ 0.2+ 111030 D29 0.4- 1.1- 111121 130 0.0 0.1+ 111025 291 0.4+ 0.3+ 111031 H06 0.0 0.3+ 111122 372 0.6+ 0.5+ 111025 291 0.3+ 0.1+ 111031 H06 0.2- 0.2+ 111122 372 0.3- 0.4- 111025 F65 0.7+ 0.2+ 111031 H06 0.5- 0.1+ 111122 372 0.2- 0.6- 111025 F65 0.9+ 0.6+ 111031 D29 0.1+ 0.1+ 111122 372 0.4+ 0.6+ 111025 D90 0.6- 0.5- 111031 D29 0.3- 0.3+ 111123 703 0.1- 0.6+ 111025 D90 0.9- 0.6- 111031 D29 0.1- 0.3- 111123 703 1.9- 0.9+ 111025 D90 0.2- 0.1+ 111101 H06 0.3- 0.4+ 111123 703 1.3- 0.6+ 111025 B18 0.9- 0.2- 111101 H06 0.5- 0.2+ 111123 703 (0.3- 2.3+) 111025 B18 0.7- 0.4- 111101 H06 0.3- 0.4+ 111124 H06 0.1+ 0.1- 111025 B18 0.2- 0.1- 111102 H06 0.0 0.2+ 111124 H06 0.2+ 0.2- 111026 291 0.2+ 0.2+ 111102 H06 0.1- 0.1+ 111124 H06 0.4+ 0.2- 111026 291 0.5+ 0.1+ 111104 291 0.2+ 0.3+ 111126 349 0.2+ 0.6- 111026 291 0.6+ 0.3+ 111104 291 0.1- 0.5+ 111126 349 0.8+ 1.1- 111026 H06 0.1+ 0.1- 111104 291 0.0 0.1- 111224 349 0.5+ 0.1- 111026 H06 0.3+ 0.1- 111115 703 0.4+ 0.2- 111224 349 0.9+ 0.6+ 111026 H06 0.4+ 0.2- 111115 703 0.4- 0.9- 111229 J01 0.1+ 0.5- 111027 B82 0.6+ 0.5+ 111115 703 1.5- 0.4- 111229 J01 0.6- 0.1- 111027 B82 0.1+ 0.2- 111115 703 1.1- 0.5- 111229 J01 0.0 0.4+ 111027 B82 0.0 0.5+ 111117 291 0.8+ 0.6+ 2012/ 111027 C32 0.3- 0.4- 111117 291 0.7+ 0.2+ 120116 204 0.2- 0.2- 111027 C32 0.4+ 0.3- 111117 291 0.4+ 0.3+ 120116 204 0.2- 0.1- 111027 C32 0.2+ 0.2- 111117 704 0.3- 0.5+ 120316 G96 0.7- 0.3+ 111027 C32 0.3+ 0.3- 111117 704 0.2+ 0.0 120316 G96 0.4- 0.3- 111028 J01 0.4+ 0.5- 111117 704 1.7- 1.0+ 120316 G96 0.9+ 0.1- 111028 J01 0.0 0.3- 111118 157 0.2+ 0.1+ 120316 G96 0.2+ 0.1+ ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 Apr. 28