Nakano Note (Nakano wa Kangaeru noda) NK 3442 P/WISE (2010 P4 = 2017 S1)

The following improved orbital elements, by S. Nakano, are from 66 observations 2010 to 2017. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.57 arc second. Residuals from the prediction by S. Nakano in HICQ 2017 were -185" for Right Ascension and -184" for Declination with the delta-T correction = +0.083 day. See the previous orbits in NK 2016, NK 2725 and HICQ 2017. Epoch = 2017 Sept. 4.0 TT T = 2017 Aug. 18.42936 +/- 0.00077 (m.e.) TT Peri. = 354.15587 +/- 0.00042 Node = 2.23392 +/- 0.00010 (2000.0) Inc. = 24.07883 +/- 0.00006 q = 1.8607419 +/- 0.0000064 AU e = 0.4978765 +/- 0.0000017 a = 3.7057457 +/- 0.0000048 AU n' = 0.13816265 +/- 0.00000027 P = 7.134 +/- 0.0000139 years T = 2010 July 6.07905 TT Epoch = 2010 July 23.0 TT Peri. = 354.24766 e = 0.4987354 Node = 2.21333 (2000.0) a = 3.7036121 AU Inc. = 24.10179 n'= 0.13828206 q = 1.8564898 AU P = 7.128 years The predicted orbit for the 2024 return is as follows: T = 2024 Oct. 3.76239 TT Epoch = 2024 Oct. 17.0 TT Peri. = 354.28244 e = 0.4991378 Node = 2.17736 (2000.0) a = 3.6969518 AU Inc. = 24.10946 n'= 0.13865591 q = 1.8516635 AU P = 7.108 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2010/ 100812 291 0.1+ 0.6+ 101018 F65 0.3- 0.0 100806 C51 0.5+ 0.9- 100812 291 1.7- 0.2+ 101018 F65 0.3+ 0.2+ 100806 C51 0.5+ 1.2- 100813 H36 1.0- 0.4- 101029 F65 0.3+ 0.2+ 100806 C51 0.3- 0.8+ 100813 H36 (0.1- 3.1-) 101029 F65 0.5+ 0.3+ 100806 C51 0.4- 0.0 100813 291 0.9- 1.1+ 101029 F65 0.3+ 0.2+ 100807 C51 0.7- 1.8- 100813 291 0.9- 0.5+ 101029 F65 0.3+ 0.3+ 100807 C51 1.1+ 0.1- 100813 291 1.2- 0.4+ 101031 585 0.1+ 0.5+ 100807 C51 1.1- 0.2- 100816 H21 0.5+ 0.2- 101031 585 0.7+ 0.9- 100807 C51 0.2+ 1.4- 100816 H21 0.1+ 0.2- 101031 585 0.2- 0.5+ 100807 C51 0.0 0.4- 100912 H06 0.5+ 0.6+ 101105 204 0.5- 0.4- 100807 C51 0.2+ 0.7+ 100912 H06 1.1+ 1.2+ 101105 204 0.3- 0.4- 100807 C51 1.6- 0.3+ 101006 H06 0.2- 0.5- 101108 F65 0.3- 0.6- 100807 C51 0.2+ 0.6- 101006 H06 0.4- 0.4- 101108 F65 0.3+ 0.1+ 100807 C51 (4.4+ 1.6+) 101006 H06 0.6- 0.4- 101108 F65 0.3- 0.1- 100807 C51 0.0 0.7+ 101006 F65 0.0 0.6+ 2011/ 100807 C51 (2.1+ 0.2-) 101006 F65 0.3+ 0.7+ 110102 372 0.0 0.1+ 100808 C51 0.0 0.5+ 101007 H06 0.1+ 0.3- 110102 372 0.3- 0.0 100811 291 0.8+ 0.7+ 101007 H06 0.1+ 0.2- 110102 372 0.7- 0.8- 100811 291 0.2+ 0.5+ 101007 H06 0.4+ 0.1- 2017/ 100811 291 0.7- 0.1+ 101010 215 0.1+ 0.1- 170920 J04 0.3+ 0.4- 100812 H21 0.4+ 0.3- 101012 H06 0.4- 0.1+ 170920 J04 0.4+ 0.3- 100812 H21 1.3+ 0.3+ 101012 H06 0.1- 0.0 170920 J04 0.3+ 0.5- 100812 H21 0.1+ 0.8+ 101012 H06 0.1+ 0.1- 170920 Z84 0.2+ 0.1- 100812 291 0.5+ 0.3+ 101018 F65 0.4+ 0.4+ 170920 Z84 0.2+ 0.1- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2017 Oct. 2

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