Nakano Note (Nakano wa Kangaeru noda) NK 3443 P/Spacewatch (2006 UR111 = 2017 S4)

The following improved orbital elements, by S. Nakano, are from 48 observations 2006 to 2017. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.31 arc second. Residuals from an orbit in MPO 170157 were -0.57 deg for Right Ascension and -0.12 deg for Declination with the delta-T correction = +2.33 days. Epoch = 2018 July 21.0 TT T = 2018 July 2.49395 +/- 0.00357 (m.e.) TT Peri. = 219.20570 +/- 0.00157 Node = 203.27642 +/- 0.00021 (2000.0) Inc. = 13.88284 +/- 0.00013 q = 2.7805060 +/- 0.0000397 AU e = 0.4378059 +/- 0.0000080 a = 4.9458114 +/- 0.0000202 AU n' = 0.08960820 +/- 0.00000055 P = 10.999 +/- 0.0000672 years T = 2007 July 2.64751 TT Epoch = 2007 June 29.0 TT Peri. = 219.21212 e = 0.4365641 Node = 203.43788 (2000.0) a = 4.9454017 AU Inc. = 13.87621 n'= 0.08961933 q = 2.7864170 AU P = 10.998 years The predicted orbit for the 2029 return is as follows: T = 2029 June 21.93730 TT Epoch = 2029 July 3.0 TT Peri. = 219.13691 e = 0.4384647 Node = 203.15261 (2000.0) a = 4.9317410 AU Inc. = 13.89697 n'= 0.08999195 q = 2.7693466 AU P = 10.952 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2006/ 070109 G96 0.5- 0.1- 170922 T05 0.0 0.2+ 061011 691 0.2+ 0.2+ 070109 G96 0.6+ 0.1+ 170922 T05 0.9+ 0.8- 061011 691 0.1+ 0.4+ 070109 G96 0.2+ 0.3- 170924 703 0.1+ 0.0 061011 691 0.3+ 1.0+ 2017/ 170924 703 0.4+ 0.1+ 061019 691 0.1+ 0.4+ 170911 F51 0.1+ 0.2+ 170924 703 0.5+ 0.3+ 061019 691 0.1+ 0.3+ 170911 F51 0.0 0.2+ 170924 703 0.2+ 0.2- 061019 691 0.1+ 1.0+ 170911 F51 0.2- 0.2+ 170924 F51 0.0 0.1- 061021 691 0.7- 0.3+ 170911 F51 0.0 0.1+ 170924 F51 0.0 0.1- 061021 691 0.0 0.3+ 170916 F51 0.0 0.1- 170924 F51 0.0 0.1- 061021 691 0.0 0.2+ 170916 F51 0.0 0.1- 170924 F51 0.0 0.2- 061023 691 0.1- 0.1- 170916 F51 0.0 0.0 170925 568 0.0 0.1- 061023 691 0.2- 0.0 170916 F51 0.0 0.0 170925 568 0.0 0.1- 061023 691 0.1- 0.0 170918 703 0.1- 0.4- 170925 568 0.0 0.1- 061024 644 0.5- 0.0 170918 703 0.3- 0.4- 170927 F51 0.0 0.1+ 061024 644 0.2- 0.4+ 170918 703 0.8- 0.4- 170927 F51 0.1- 0.0 061024 644 0.1- 0.1+ 170918 703 0.3+ 0.1- 170927 F51 0.0 0.0 2007/ 170922 T05 0.5+ 0.6+ 070109 G96 0.0 0.2- 170922 T05 (0.6- 2.4-) ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2017 Oct. 2

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