Nakano Note (Nakano wa Kangaeru noda) NK 1747 215P/NEAT (2002 O8 = 2009 B5)

The following improved orbital elements, by S. Nakano, are from 99 observations 2001 to 2009. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.59 arc second. The delta-T correction is -0.31 day for the prediction in NK 1459 (= HICQ 2008/2009). Also see an orbits in NK 969. Epoch = 2010 June 13.0 TT T = 2010 June 8.03884 +/- 0.00119 (m.e.) TT Peri. = 222.45278 +/- 0.00017 Node = 75.44083 +/- 0.00011 (2000.0) Inc. = 12.78996 +/- 0.00002 q = 3.2133782 +/- 0.0000011 AU e = 0.2011137 +/- 0.0000002 a = 4.0223221 +/- 0.0000004 AU n' = 0.12217682 +/- 0.00000002 P = 8.067 +/- 0.0000013 years T = 2002 May 8.61618 TT Epoch = 2002 May 6.0 TT Peri. = 222.28117 e = 0.1992605 Node = 75.50161 (2000.0) a = 4.0330079 AU Inc. = 12.78565 n'= 0.12169156 q = 3.2293888 AU P = 8.099 years The predicted orbit for the 2019 return is as follows: T = 2019 Nov. 18.03553 TT Epoch = 2019 Nov. 13.0 TT Peri. = 262.02425 e = 0.1674844 Node = 56.69256 (2000.0) a = 4.3299839 AU Inc. = 10.58135 n'= 0.10938925 q = 3.6047791 AU P = 9.010 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2001/ 020804 474 0.3+ 0.2- 020909 372 0.9+ 1.1+ 010522 691 0.1- 0.4+ 020804 474 0.1- 0.2- 020910 428 1.1+ 0.2+ 010522 691 0.1+ 0.0 020804 428 0.6- 0.4+ 020910 428 1.3+ 0.0 010522 691 0.1- 0.5+ 020804 428 0.5- 0.2- 021008 322 (6.2+ 4.9-) 010611 691 0.5+ 0.8+ 020804 474 0.0 0.0 021009 322 (2.5+ 1.9+) 010611 691 0.1+ 0.5+ 020804 474 0.2- 0.1- 021009 322 0.3+ 0.2- 010611 691 0.7+ 0.0 020804 474 0.1+ 0.3- 021009 322 (1.6- 5.0-) 2002/ 020805 644 0.3- 0.0 021026 704 0.9- 1.0- 020516 608 0.0 0.3+ 020805 644 0.5- 0.1+ 021026 704 1.6+ 0.4- 020516 608 0.8- 0.3- 020805 644 0.2- 0.2+ 021026 704 0.4+ 0.6+ 020516 608 0.2- 0.2+ 020805 428 0.1- 0.1+ 021026 704 (0.0 2.1-) 020705 704 0.1- 0.2- 020805 428 0.1+ 0.0 021106 360 0.5+ 0.3+ 020705 704 1.1- 0.4- 020807 360 0.5+ 0.2- 021106 360 0.9+ 0.1+ 020705 704 1.0- 1.3- 020807 360 0.0 0.6- 2003/ 020716 644 0.2- 0.2- 020807 360 0.2+ 0.5- 030926 360 0.1- 0.1+ 020716 644 0.1+ 0.1- 020807 213 1.5- 0.3+ 030926 360 1.3- 1.2- 020716 644 0.4- 0.2- 020807 213 (0.4+ 2.2+) 030926 360 (1.7- 2.4-) 020729 644 0.0 0.0 020807 213 (5.6- 2.1-) 030930 360 0.4+ 0.3+ 020729 644 0.1- 0.2+ 020807 213 (2.2- 0.3-) 031002 360 0.7+ 0.1+ 020729 644 0.2+ 0.1+ 020813 644 0.0 0.3+ 031002 360 0.3- 0.1- 020803 644 0.2- 0.2- 020813 644 0.2- 0.3+ 031002 360 0.2+ 0.2+ 020803 644 1.0- 0.7+ 020813 644 0.7+ 0.0 031019 360 0.3+ 0.8+ 020803 644 0.1- 0.1+ 020813 322 0.2- 0.2- 031019 360 0.6- 0.0 020803 620 1.3- 0.4- 020813 322 0.3- 0.5- 031024 360 0.2- 0.0 020803 620 (2.5- 3.9-) 020813 322 0.6- 0.1+ 031024 360 0.3- 0.4+ 020803 118 1.2- 0.6- 020813 170 1.1+ 0.9- 031024 360 0.8- 0.4+ 020803 118 0.9- 0.4+ 020813 170 0.6+ 1.8+ 031027 699 1.5- 0.4+ 020803 118 1.0- 0.1- 020814 213 0.1- 0.1- 031027 699 0.8+ 1.0+ 020804 844 0.4- 0.3+ 020814 213 (3.6- 0.2-) 031027 699 1.0- 0.1+ 020804 844 0.2- 1.1+ 020814 213 0.4+ 0.6+ 031027 699 0.1- 0.4+ 020804 844 0.6- 0.1- 020828 322 0.4+ 0.6- 031101 204 0.2+ 0.0 020804 844 0.9+ 0.4- 020828 322 0.4+ 0.2- 031119 204 1.1+ 1.3+ 020804 734 0.0 0.1- 020828 322 0.6+ 0.5- 2009/ 020804 734 0.4+ 0.2- 020903 428 1.4+ 0.2+ 090122 H36 0.3+ 0.3- 020804 474 0.2- 0.4- 020903 428 1.3+ 0.2+ 090122 H36 1.4+ 1.0+ 020804 474 0.1+ 0.3- 020908 360 0.8+ 0.0 090202 H36 0.0 0.6+ 020804 474 0.1- 0.3- 020908 360 0.6+ 0.5- 090202 H36 0.5- 0.9+ 020804 474 0.3+ 0.2- 020909 372 0.3+ 0.9+ ( ) -------- Rejected Obs.

Managing Director of the Oriental Astronomical Association Syuichi Nakano 2009 Feb. 16

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