Nakano Note (Nakano wa Kangaeru noda) NK 1744 212P/NEAT (2000 YN30)

The following improved orbital elements, by S. Nakano, are from 60 observations 2000 to 2009. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.64 arc second. Epoch = 2008 Nov. 30.0 TT T = 2008 Dec. 3.26907 +/- 0.00040 (m.e.) TT Peri. = 15.04842 +/- 0.00021 Node = 98.92899 +/- 0.00004 (2000.0) Inc. = 22.39793 +/- 0.00004 q = 1.6544645 +/- 0.0000013 AU e = 0.5788759 +/- 0.0000003 a = 3.9286860 +/- 0.0000011 AU n' = 0.12657068 +/- 0.00000005 P = 7.787 +/- 0.0000033 years T = 2001 Feb. 25.74671 TT Epoch = 2001 Feb. 20.0 TT Peri. = 15.00615 e = 0.5803430 Node = 98.95738 (2000.0) a = 3.9175491 AU Inc. = 22.43946 n'= 0.12711079 q = 1.6440271 AU P = 7.754 years The predicted orbit for the 2016 return is as follows: T = 2016 Sept.10.41332 TT Epoch = 2016 Sept. 9.0 TT Peri. = 15.08064 e = 0.5800968 Node = 98.88610 (2000.0) a = 3.9165054 AU Inc. = 22.42818 n'= 0.12716160 q = 1.6445532 AU P = 7.751 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2000/ 010121 699 0.2+ 1.1+ 081225 H45 0.2- 0.0 001201 608 0.6- 0.5- 010121 699 0.5+ 0.7+ 081225 H45 0.0 0.1- 001201 608 0.5- 0.6- 010217 704 0.6+ 1.0- 081225 H45 0.0 0.3- 001201 608 0.3- 0.0 010217 704 0.2+ 1.2- 081225 H45 0.1- 0.0 001226 608 0.5- 0.4- 010217 704 1.2+ 1.3- 081225 H45 0.0 0.0 001226 608 0.5- 0.1+ 010221 704 0.3+ 0.4- 081225 H45 0.1+ 0.0 001226 608 0.6- 0.3- 010221 704 0.1- 0.5- 081228 H45 0.3+ 0.5- 001229 608 0.4+ 0.4- 010221 704 0.4+ 0.4- 081228 H45 0.2+ 0.2- 001229 608 1.0+ 0.4- 2008/ 081228 H45 0.3+ 0.4- 001229 608 0.2+ 0.5- 081030 691 0.1- 0.4+ 081228 H45 0.2+ 0.6+ 2001/ 081030 691 0.0 0.5+ 081228 H45 0.2- 0.3+ 010104 608 1.5+ 0.0 081030 691 0.1- 0.2+ 081230 H45 0.0 0.1- 010104 608 1.3+ 0.5+ 081103 691 0.4- 0.2+ 081230 H45 0.6+ 0.3- 010104 608 1.3+ 0.0 081103 691 0.6- 0.3+ 081230 H45 0.1+ 0.2- 010120 608 0.4+ 0.9+ 081103 691 0.6- 0.6+ 081230 H45 0.4+ 0.1+ 010120 608 0.1- 1.9+ 081108 691 1.5- 0.6+ 081230 H45 0.2- 0.3- 010120 608 (0.7+ 3.0+) 081108 691 0.9- 0.4+ 2009/ 010121 691 1.0- 1.6- 081108 691 0.3- 0.6+ 090116 704 0.9+ 0.7- 010121 699 0.3- 0.4+ 081203 704 0.1- 0.3- 090116 704 0.5+ 0.0 010121 691 0.8- 0.1+ 081203 704 1.1+ 0.4+ 090116 704 1.8- 0.1+ 010121 699 1.4- 0.8+ 081203 704 0.6+ 0.0 090117 J24 (4.6+ 5.1+) 010121 691 0.9- 0.1+ 081203 704 1.1+ 0.2+ 090117 J24 0.3- 1.6+ ( ) -------- Rejected Obs.

Managing Director of the Oriental Astronomical Association Syuichi Nakano 2009 Jan. 23

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