Nakano Note (Nakano wa Kangaeru noda) NK 2226 P/2012 BJ98

The following improved orbital elements, by S. Nakano, are from 84 observations 2011 Dec. 29 to 2012 Apr. 12. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.55 arc second. Epoch = 2012 Sept.30.0 TT T = 2012 Sept.20.43023 +/- 0.01300 (m.e.) TT Peri. = 72.96898 +/- 0.00076 Node = 124.03010 +/- 0.00038 (2000.0) Inc. = 2.63692 +/- 0.00016 q = 2.1565833 +/- 0.0000942 AU e = 0.8737739 +/- 0.0001137 a = 17.0850859 +/- 0.0009020 AU n' = 0.01395656 +/- 0.00000111 P = 70.620 +/- 0.0055925 years (+/- 2.04 days) The predicted orbit for the 2083 return is as follows: T = 2083 Dec. 7.43064 TT Epoch = 2083 Dec. 7.0 TT Peri. = 73.19475 e = 0.8747164 Node = 123.79977 (2000.0) a = 17.2964371 AU Inc. = 2.63231 n'= 0.01370153 q = 2.1669594 AU P = 71.934 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2011/ 120224 G96 0.4- 0.0 120321 B82 1.0+ 0.4+ 111229 691 0.9- 1.7- 120301 G96 0.5- 0.4+ 120323 C10 0.4+ 0.9- 111229 691 0.4+ 0.3- 120301 G96 0.7- 0.2+ 120323 C10 0.5+ 0.4+ 111229 691 0.5+ 0.3+ 120301 G96 0.8- 0.2+ 120324 E07 0.3+ 0.2- 2012/ 120301 G96 0.3- 0.2- 120324 E07 0.1- 0.1- 120106 691 0.3- 0.6+ 120301 204 0.2+ 0.1- 120325 D88 0.9+ 1.0+ 120106 691 0.7- 0.1- 120301 204 0.2- 0.3- 120325 D88 1.3+ 0.6+ 120106 691 0.2+ 0.2+ 120302 204 0.0 0.7- 120325 C10 0.5- 0.5+ 120114 691 0.7- 0.2+ 120312 H06 0.0 0.7+ 120325 C10 0.8- 0.4+ 120114 691 1.5- 0.5+ 120312 H06 0.1- 0.1+ 120325 C10 0.5+ 1.0- 120114 691 0.5- 0.1+ 120314 130 0.2+ 0.6- 120326 215 1.2+ 0.2- 120126 G96 0.5- 0.1+ 120314 130 0.1+ 0.3- 120326 215 1.0+ 0.1- 120126 G96 0.3- 0.0 120314 130 0.2- 0.5- 120326 215 0.7+ 1.6+ 120126 G96 0.1- 0.2+ 120315 511 0.2+ 0.1- 120327 J87 0.2- 0.1- 120126 G96 0.3+ 0.1+ 120315 511 0.1+ 0.4+ 120327 J87 0.2- 0.2- 120126 F51 0.3+ 0.0 120316 511 0.1- 0.1- 120327 J87 0.1- 0.0 120126 F51 0.2+ 0.2+ 120316 511 0.5+ 0.1- 120403 D90 1.4+ 1.9- 120126 F51 0.4+ 0.1- 120319 C32 0.1- 0.0 120403 D90 0.2- 1.1- 120131 703 0.6- 0.9- 120319 C32 0.2- 0.2+ 120404 F51 0.4- 0.2+ 120131 703 1.8- 0.8- 120319 C32 0.1- 0.3+ 120404 F51 0.6- 0.1+ 120131 703 1.0- 0.7- 120319 C10 0.6- 0.7+ 120407 213 0.6+ 0.4- 120131 703 0.3- 0.5- 120319 C10 0.0 0.0 120407 213 0.7+ 0.4- 120210 G96 0.1+ 0.3+ 120320 118 0.2+ 0.1- 120407 213 0.7+ 0.4- 120210 G96 0.0 0.4+ 120320 118 0.4+ 0.1- 120410 D90 0.2+ 0.5- 120210 G96 0.0 0.5+ 120321 118 0.3+ 0.2- 120410 D90 0.5+ 0.3- 120210 G96 0.7- 0.2+ 120321 118 0.2+ 0.0 120410 D90 0.9+ 0.5- 120224 G96 0.2- 0.0 120321 118 0.1- 0.0 120412 H06 0.4+ 0.2+ 120224 G96 0.5- 0.0 120321 B82 0.6+ 0.4- 120412 H06 0.2+ 0.4+ 120224 G96 0.1- 0.2+ 120321 B82 0.4+ 0.1- ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 Apr. 15

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