Nakano Note (Nakano wa Kangaeru noda) NK 2221 P/2011 Y3 (Boattini)

The following improved orbital elements, by S. Nakano, are from 52 observations 2011 Dec. 25 to 2012 Feb. 20. 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 = 2011 Aug. 27.0 TT T = 2011 Aug. 22.84076 +/- 0.23623 (m.e.) TT Peri. = 340.65602 +/- 0.04965 Node = 84.80427 +/- 0.00062 (2000.0) Inc. = 26.51354 +/- 0.00408 q = 3.4976151 +/- 0.0004683 AU e = 0.7055148 +/- 0.0002558 a = 11.8770501 +/- 0.0008789 AU n' = 0.02407915 +/- 0.00000267 P = 40.932 +/- 0.0045434 years (+/- 1.66 days) The predicted orbit for the 2051 return is as follows: T = 2051 Oct. 16.53477 TT Epoch = 2051 Nov. 5.0 TT Peri. = 340.62058 e = 0.7020795 Node = 84.78097 (2000.0) a = 11.6764707 AU Inc. = 26.55531 n'= 0.02470226 q = 3.4786600 AU P = 39.899 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2011/ 111226 G96 0.6+ 0.0 111227 C32 0.3- 0.1+ 111225 G96 1.0- 0.0 111226 C32 0.1- 0.8- 111227 C32 0.9- 0.0 111225 G96 0.0 0.5+ 111226 C32 1.2+ 0.5+ 111229 C10 0.8- 0.4- 111225 G96 0.6+ 0.1- 111226 C32 0.2- 0.6- 111229 C10 1.1- 0.1+ 111225 G96 1.3- 0.2+ 111226 J87 0.2+ 0.2- 111229 C10 1.8+ 0.5+ 111225 G96 0.1+ 0.4- 111226 J87 0.3+ 0.0 111229 H06 1.2- 0.0 111225 G96 0.5- 0.5- 111226 J87 0.1- 0.0 111229 H06 0.5- 0.7- 111225 G96 0.3- 0.0 111227 291 0.6+ 0.3+ 2012/ 111225 I89 (2.1- 0.3+) 111227 291 0.5+ 0.1+ 120104 G96 0.0 0.1+ 111225 I89 1.1- 0.1+ 111227 291 0.6+ 0.5+ 120104 G96 0.5+ 0.4- 111225 204 1.1+ 0.4- 111227 H06 0.7- 0.2+ 120104 G96 0.2+ 0.2+ 111225 204 0.5+ 0.1- 111227 H06 0.5- 0.2- 120104 G96 0.3+ 0.0 111226 204 0.1+ 0.3- 111227 H06 0.5- 0.4- 120114 H06 0.6+ 0.4+ 111226 H21 1.2+ 0.1- 111227 H06 0.0 0.2+ 120114 H06 0.2- 0.3+ 111226 H21 0.6+ 0.1+ 111227 104 (2.3- 1.4+) 120114 H06 0.5- 0.4+ 111226 H21 0.6+ 0.7+ 111227 104 0.2+ 1.1+ 120117 104 (4.4+ 2.4+) 111226 G96 0.2- 0.3- 111227 104 0.7+ 0.6+ 120117 104 0.2- 1.0- 111226 G96 0.2- 0.4- 111227 C32 0.4+ 0.1+ 120220 C32 0.5+ 0.6- 111226 G96 0.5- 0.0 111227 C32 0.3- 0.1- 120220 C32 0.5- 0.6+ ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 Mar. 27

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