Nakano Note (Nakano wa Kangaeru noda) NK 2188 P/2011 Y2 (Boattini)

The following improved orbital elements, by S. Nakano, are from 59 observations 2011 Sept. 4 to Dec. 28. 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 = 2012 Mar. 14.0 TT T = 2012 Mar. 21.69640 +/- 0.00368 (m.e.) TT Peri. = 131.18974 +/- 0.00236 Node = 310.00972 +/- 0.00090 (2000.0) Inc. = 6.35175 +/- 0.00006 q = 1.7872738 +/- 0.0000595 AU e = 0.7126470 +/- 0.0000589 a = 6.2197856 +/- 0.0002075 AU n' = 0.06353908 +/- 0.00000318 P = 15.512 +/- 0.0007762 years (+/- 0.28 day) The predicted orbit for the 2027 return is as follows: T = 2027 Sept.29.55458 TT Epoch = 2027 Oct. 2.0 TT Peri. = 132.17867 e = 0.7106616 Node = 309.26572 (2000.0) a = 6.2144951 AU Inc. = 6.39379 n'= 0.06362024 q = 1.7980918 AU P = 15.492 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2011/ 111225 G96 0.4- 0.6+ 111226 G96 0.8+ 0.2+ 110904 F51 0.0 0.0 111225 H21 0.0 0.1+ 111227 291 0.3- 0.4+ 110904 F51 0.0 0.0 111225 G96 0.1+ 0.1+ 111227 291 0.4- 0.4+ 110904 F51 0.1- 0.1+ 111225 H21 0.1+ 0.1+ 111227 291 0.7- 0.4+ 111016 691 0.0 0.2- 111225 G96 0.3+ 0.0 111227 104 1.0+ 0.4+ 111016 691 0.7+ 0.1+ 111225 H21 0.4- 1.0- 111227 104 0.4- 0.2+ 111016 691 0.6- 0.3- 111225 204 0.2+ 0.2- 111227 104 1.7+ 0.1- 111030 G96 0.0 0.4- 111225 I89 1.4- 0.1- 111227 595 0.2+ 0.9- 111030 G96 0.2+ 0.0 111225 I89 0.3- 0.1+ 111227 595 0.8+ 0.7- 111030 G96 0.1+ 0.0 111225 I89 0.0 0.1- 111227 C32 0.1+ 0.1+ 111030 G96 0.3- 0.2+ 111225 204 0.1+ 0.5+ 111227 C32 0.1- 1.2+ 111224 G96 0.0 0.4- 111225 204 0.0 0.4+ 111227 C32 0.3+ 0.0 111224 G96 0.4+ 0.1- 111226 H21 0.1- 0.3- 111227 C32 0.8+ 0.9- 111224 G96 0.0 0.1+ 111226 H21 0.5- 0.2- 111228 291 0.4- 0.6+ 111224 G96 0.4+ 0.1+ 111226 H21 0.2+ 0.2- 111228 G96 0.4- 0.2+ 111224 G96 0.4+ 0.1- 111226 H21 0.1+ 0.4- 111228 291 1.0- 0.2+ 111224 G96 0.2+ 0.3- 111226 H21 0.4+ 0.2- 111228 291 1.2- 0.5+ 111224 G96 0.1- 0.0 111226 G96 0.1- 0.2+ 111228 G96 0.3+ 0.1- 111224 G96 0.3- 0.2- 111226 G96 0.7- 0.2- 111228 G96 0.1- 0.1+ 111225 G96 0.5+ 0.2- 111226 G96 0.5- 0.2- 111228 G96 0.4+ 0.1+

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 Jan. 2

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