Nakano Note (Nakano wa Kangaeru noda) NK 2262 258P/PANSTARRS (2012 H1 = 2002 obs. = 2003 obs.)

The following improved orbital elements, by S. Nakano, are from 35 observations 2002 to 2012. 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. The delta-T correction for an orbit on HICQ 2012 was -0.59 day for 2002/2003 observations with RunOff +0.13 deg (R. A.) and -0.04 deg (Decl.) for 2002 observations. Epoch = 2011 Mar. 20.0 TT T = 2011 Mar. 18.75832 +/- 0.00613 (m.e.) TT Peri. = 25.77213 +/- 0.00112 Node = 126.34380 +/- 0.00036 (2000.0) Inc. = 6.74531 +/- 0.00001 q = 3.4793834 +/- 0.0000074 AU e = 0.2091825 +/- 0.0000017 a = 4.3997296 +/- 0.0000030 AU n' = 0.10679848 +/- 0.00000011 P = 9.229 +/- 0.0000095 years T = 2002 Jan. 9.16602 TT Epoch = 2002 Jan. 6.0 TT Peri. = 25.87042 e = 0.2109180 Node = 126.36014 (2000.0) a = 4.3815634 AU Inc. = 6.75258 n'= 0.10746336 q = 3.4574129 AU P = 9.172 years The predicted orbit for the 2020 return is as follows: T = 2020 June 19.61715 TT Epoch = 2020 May 31.0 TT Peri. = 26.11836 e = 0.2091209 Node = 126.24752 (2000.0) a = 4.4021090 AU Inc. = 6.74585 n'= 0.10671191 q = 3.4815360 AU P = 9.236 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2002/ 2012/ 120428 568 0.2- 0.2- 020311 644 0.2+ 0.2+ 120328 G96 0.8- 0.4+ 120428 568 0.1- 0.0 020311 644 0.2- 0.0 120328 G96 0.3- 0.4- 120428 568 0.1- 0.0 020311 644 0.1+ 0.0 120328 G96 0.2- 0.2+ 120428 568 0.1- 0.0 2003/ 120328 G96 0.8- 0.3- 120430 291 0.1+ 0.1- 030527 691 0.8+ 0.8+ 120329 691 0.2+ 0.7- 120430 291 0.7+ 0.3+ 030527 691 0.1- 0.2+ 120329 691 1.2- 0.7- 120430 291 0.0 0.1+ 030527 691 0.7- 0.5- 120329 691 0.4- 0.3+ 120502 H06 1.6- 1.2+ 2011/ 120427 F51 0.2+ 0.2+ 120502 H06 1.0- 0.8+ 110207 G96 0.0 0.3+ 120427 F51 0.1- 0.0 120502 H06 0.6- 0.3+ 110207 G96 0.1+ 0.8- 120427 F51 0.1+ 0.1+ 120521 F51 0.2+ 0.0 110207 G96 0.2- 0.7+ 120427 F51 0.1- 0.0 120521 F51 0.2+ 0.2- 110207 G96 0.0 0.0 120428 568 0.1- 0.1- 120521 F51 0.5+ 0.0 ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 May 27

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