Nakano Note (Nakano wa Kangaeru noda) NK 2387 P/2011 U2 (Bressi)
The following improved orbital elements, by S. Nakano, are from 115 observations 2011 Oct. 24 to 2013 Jan. 19. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.49 arc second. The 2013 January observations show residuals 25" up from an orbit in NK 2254 (= HICQ 2012). Comet has passed 1.13 AU from Jupiter on 2012 Mar. 16 UT. See the previous orbits in NK 2206 and NK 2254. Epoch = 2012 Apr. 23.0 TT T = 2012 May 8.03776 +/- 0.11076 (m.e.) TT Peri. = 157.78482 +/- 0.01070 Node = 266.69281 +/- 0.00029 (2000.0) Inc. = 9.63013 +/- 0.00006 q = 4.8373548 +/- 0.0000206 AU e = 0.1109134 +/- 0.0000124 a = 5.4408137 +/- 0.0000148 AU n' = 0.07766195 +/- 0.00000031 P = 12.691 +/- 0.0000519 years The predicted orbit for the 2023 return is as follows: T = 2023 Nov. 4.39307 TT Epoch = 2023 Oct. 23.0 TT Peri. = 169.38521 e = 0.1275124 Node = 260.04067 (2000.0) a = 4.7367745 AU Inc. = 9.79302 n'= 0.09560487 q = 4.1327771 AU P = 10.309 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2011/ 111029 H06 0.1+ 0.3+ 111121 215 0.2- 0.3- 111024 691 0.7- 0.1- 111029 H06 0.3+ 0.2+ 111121 215 0.3- 0.5- 111024 691 1.9- 0.2- 111029 157 0.3- 0.1+ 111121 130 0.9- 0.3- 111024 691 0.9- 0.0 111029 157 0.3- 0.3- 111121 130 0.1- 0.5- 111024 291 0.1+ 0.3+ 111030 D29 1.6+ 0.4- 111121 130 0.3- 0.0 111024 291 0.3+ 0.2+ 111030 D29 0.8+ 0.7- 111122 372 0.3+ 0.4+ 111024 291 0.2+ 0.5+ 111030 D29 0.5- 1.1- 111122 372 0.5- 0.5- 111024 B18 0.7+ 0.3+ 111031 H06 0.1- 0.4+ 111122 372 0.5- 0.7- 111024 B18 0.2+ 0.7+ 111031 H06 0.3- 0.2+ 111122 372 0.1+ 0.5+ 111024 B18 0.0 0.2+ 111031 H06 0.6- 0.1+ 111123 703 0.4- 0.5+ 111025 291 0.2+ 0.2+ 111031 D29 0.0 0.2+ 111123 703 (2.1- 0.8+) 111025 291 0.4+ 0.4+ 111031 D29 0.4- 0.3+ 111123 703 1.6- 0.5+ 111025 291 0.3+ 0.2+ 111031 D29 0.2- 0.2- 111123 703 (0.5- 2.1+) 111025 F65 0.7+ 0.2+ 111101 H06 0.4- 0.4+ 111124 H06 0.2- 0.2- 111025 F65 0.9+ 0.7+ 111101 H06 0.6- 0.2+ 111124 H06 0.1- 0.3- 111025 D90 0.7- 0.4- 111101 H06 0.4- 0.5+ 111124 H06 0.1+ 0.3- 111025 D90 0.9- 0.5- 111102 H06 0.2- 0.2+ 111126 349 0.0 0.7- 111025 D90 0.2- 0.2+ 111102 H06 0.2- 0.1+ 111126 349 0.5+ 1.2- 111025 B18 0.9- 0.2- 111104 291 0.1+ 0.3+ 111224 349 0.5+ 0.2- 111025 B18 0.7- 0.3- 111104 291 0.2- 0.5+ 111224 349 0.9+ 0.5+ 111025 B18 0.2- 0.0 111104 291 0.1- 0.0 111229 J01 0.1+ 0.6- 111026 291 0.2+ 0.2+ 111115 F51 0.5+ 0.0 111229 J01 0.6- 0.2- 111026 291 0.5+ 0.2+ 111115 703 0.1+ 0.3- 111229 J01 0.0 0.3+ 111026 291 0.5+ 0.4+ 111115 703 0.6- 1.0- 2012/ 111026 H06 0.1+ 0.0 111115 703 1.7- 0.4- 120116 204 0.0 0.2- 111026 H06 0.2+ 0.0 111115 F51 0.5+ 0.0 120116 204 0.0 0.1- 111026 H06 0.4+ 0.1- 111115 703 1.3- 0.5- 120316 G96 0.9- 0.5+ 111027 B82 0.6+ 0.6+ 111117 291 0.5+ 0.6+ 120316 G96 0.6- 0.1- 111027 B82 0.0 0.1- 111117 291 0.4+ 0.1+ 120316 G96 0.7+ 0.1+ 111027 B82 0.0 0.6+ 111117 291 0.2+ 0.2+ 120316 G96 0.1+ 0.3+ 111027 C32 0.3- 0.3- 111117 704 0.6- 0.4+ 2013/ 111027 C32 0.4+ 0.2- 111117 704 0.1- 0.1- 130104 G96 0.6+ 0.0 111027 C32 0.1+ 0.1- 111117 704 1.9- 0.9+ 130104 G96 0.2- 0.2+ 111027 C32 0.3+ 0.2- 111118 157 0.0 0.0 130104 G96 0.0 0.1+ 111028 J01 0.3+ 0.4- 111118 157 0.4+ 0.2- 130104 G96 1.0- 0.7- 111028 J01 0.1- 0.3- 111118 C32 0.0 0.4+ 130104 G96 0.3- 0.9- 111028 J01 0.3- 0.3- 111118 C32 0.0 0.5+ 130119 G96 0.2+ 0.7+ 111029 204 0.2+ 0.1- 111118 C32 0.2- 0.2+ 130119 G96 0.5+ 0.2+ 111029 204 0.4+ 0.0 111118 C32 0.2- 0.2+ 130119 G96 0.1- 0.5+ 111029 H06 0.2- 0.0 111121 215 0.1+ 0.3- 130119 G96 0.4+ 0.0 ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2013 Jan. 29