Nakano Note (Nakano wa Kangaeru noda) NK 2260 P/2011 Y2 (Boattini)

The following improved orbital elements, by S. Nakano, are from 92 observations 2011 Sept. 4 to 2012 Apr. 11. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.46 arc second. See an orbit in NK 2188. Epoch = 2012 Mar. 14.0 TT T = 2012 Mar. 21.69083 +/- 0.00017 (m.e.) TT Peri. = 131.19303 +/- 0.00028 Node = 310.00883 +/- 0.00026 (2000.0) Inc. = 6.35170 +/- 0.00001 q = 1.7871821 +/- 0.0000024 AU e = 0.7127644 +/- 0.0000116 a = 6.2220081 +/- 0.0000406 AU n' = 0.06350504 +/- 0.00000062 P = 15.520 +/- 0.0001518 years (+/- 0.06 day) The predicted orbit for the 2027 return is as follows: T = 2027 Oct. 2.56995 TT Epoch = 2027 Oct. 2.0 TT Peri. = 132.18185 e = 0.7107825 Node = 309.26499 (2000.0) a = 6.2166377 AU Inc. = 6.39372 n'= 0.06358735 q = 1.7979606 AU P = 15.500 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 H21 0.0 0.4- 111230 G83 0.3+ 0.3+ 110904 F51 0.0 0.1+ 111226 H21 0.4- 0.3- 111230 G83 0.0 0.1+ 110904 F51 0.0 0.1+ 111226 H21 0.3+ 0.3- 111230 G83 0.0 0.6+ 110904 F51 0.1- 0.2+ 111226 H21 0.2+ 0.6- 111230 G83 0.5+ 0.2+ 111016 691 0.4- 0.3- 111226 H21 0.5+ 0.3- 111230 G83 0.1- 0.2+ 111016 691 0.2+ 0.0 111226 G96 0.0 0.1+ 111230 G83 0.0 0.1- 111016 691 1.1- 0.4- 111226 G96 0.6- 0.3- 111230 G83 0.3+ 0.6+ 111030 G96 0.3- 0.5- 111226 G96 0.4- 0.3- 111230 G83 0.2+ 0.2- 111030 G96 0.0 0.2- 111226 G96 0.9+ 0.1+ 2012/ 111030 G96 0.2- 0.1- 111227 291 0.2- 0.3+ 120104 G96 0.2- 0.2+ 111030 G96 0.5- 0.0 111227 291 0.3- 0.3+ 120104 G96 0.0 0.2- 111224 G96 0.2+ 0.4- 111227 291 0.6- 0.2+ 120104 G96 0.4- 0.4+ 111224 G96 0.6+ 0.2- 111227 104 1.0+ 0.3+ 120104 G96 0.6+ 0.4- 111224 G96 0.2+ 0.0 111227 104 0.3- 0.1+ 120112 H06 0.3+ 0.4+ 111224 G96 0.6+ 0.0 111227 104 1.7+ 0.3- 120112 H06 0.4- 0.4+ 111224 G96 0.6+ 0.2- 111227 595 0.2+ 1.1- 120112 H06 0.0 0.1+ 111224 G96 0.4+ 0.4- 111227 595 0.8+ 0.8- 120112 H06 0.3+ 0.1+ 111224 G96 0.1+ 0.1- 111227 C32 0.1+ 0.0 120115 215 0.6+ 0.7- 111224 G96 0.1- 0.3- 111227 C32 0.1- 1.1+ 120115 215 0.3+ 0.8- 111225 G96 0.6+ 0.3- 111227 C32 0.3+ 0.2- 120115 215 0.2- 1.1- 111225 G96 0.3- 0.5+ 111227 C32 0.9+ 1.0- 120219 H06 0.8- 0.7+ 111225 H21 0.1+ 0.0 111228 291 0.4- 0.5+ 120219 H06 0.5- 0.6+ 111225 G96 0.3+ 0.0 111228 G96 0.4- 0.1+ 120219 H06 1.0- 0.1- 111225 H21 0.3+ 0.0 111228 291 1.0- 0.0 120219 H06 1.2- 0.2- 111225 G96 0.4+ 0.1- 111228 291 1.2- 0.4+ 120316 G96 0.3- 0.0 111225 H21 0.2- 1.1- 111228 G96 0.4+ 0.3- 120316 G96 0.1- 0.1+ 111225 204 0.3+ 0.3- 111228 G96 0.1- 0.0 120316 G96 0.3- 0.0 111225 I89 1.3- 0.2- 111228 G96 0.5+ 0.0 120316 G96 0.6- 0.1+ 111225 I89 0.2- 0.0 111230 G83 0.2- 0.1+ 120411 H06 1.0+ 1.4+ 111225 I89 0.1+ 0.2- 111230 G83 0.1- 0.0 120411 H06 1.0+ 1.6+ 111225 204 0.2+ 0.4+ 111230 G83 0.1- 0.2+ 111225 204 0.2+ 0.3+ 111230 G83 0.1- 1.3+ ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 May 3

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