Nakano Note (Nakano wa Kangaeru noda) NK 2549 P/Li (1998 Y2 = 2013 O1)
The following improved orbital elements, by S. Nakano, are from 154 observations 1998 to 2013. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.68 arc second. The recovery observations show the residuals of -710" (R. A.) and -420" (Decl.) for the prediction in MPC 34421 (= NK 2154 = HICQ 2013) with the delta-T correction = +0.84 day. Epoch = 2014 Jan. 23.0 TT T = 2014 Feb. 4.82741 +/- 0.00218 (m.e.) TT Peri. = 319.05789 +/- 0.00053 Node = 91.86360 +/- 0.00007 (2000.0) Inc. = 24.35753 +/- 0.00004 q = 2.5223570 +/- 0.0000027 AU e = 0.5879152 +/- 0.0000004 a = 6.1209655 +/- 0.0000015 AU n' = 0.06508399 +/- 0.00000002 P = 15.144 +/- 0.0000055 years T = 1998 Dec. 17.81318 TT Epoch = 1998 Dec. 13.0 TT Peri. = 318.98341 e = 0.5885850 Node = 91.83130 (2000.0) a = 6.1224038 AU Inc. = 24.32417 n'= 0.06506106 q = 2.5188488 AU P = 15.149 years The predicted orbit for the 2029 return is as follows: T = 2029 Mar. 4.43185 TT Epoch = 2029 Mar. 5.0 TT Peri. = 319.63894 e = 0.5891218 Node = 90.86872 (2000.0) a = 6.0937799 AU Inc. = 24.30672 n'= 0.06552001 q = 2.5038012 AU P = 15.043 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1998/ 990105 402 0.8- 0.5+ 990128 367 1.2+ 0.6- 980923 703 0.4- 1.3+ 990105 351 0.3- 0.6- 990204 402 0.6- 0.3- 980923 703 0.5- 0.3- 990105 351 (2.1- 1.0-) 990204 402 0.5- 0.2- 981028 703 0.3+ 0.4+ 990105 351 1.0- 0.5- 990204 402 0.5- 0.2- 981028 703 1.0+ 0.1+ 990105 367 0.1- 0.2- 990205 372 0.7- 1.8+ 981029 703 0.5+ 0.2- 990105 367 0.0 0.0 990206 897 0.9- 0.3- 981029 703 0.8+ 0.5+ 990105 367 0.2+ 0.3- 990206 897 0.5+ 0.0 981226 662 0.5- 0.3+ 990105 118 0.0 0.5- 990214 900 0.1+ 0.6+ 981226 662 0.4- 0.0 990105 118 0.2+ 0.7- 990214 900 (2.8+ 1.0-) 981227 662 0.2- 0.4- 990105 540 1.2+ 1.7- 990214 360 0.1- 0.0 981227 662 0.0 0.8+ 990105 540 (0.8+ 2.2-) 990214 360 0.0 0.1+ 981227 662 0.9- 1.0+ 990105 540 0.1+ 0.0 990216 071 0.6+ 0.6- 981228 761 0.4- 0.4+ 990105 540 0.5+ 0.2- 990216 071 0.9+ 0.4- 981228 958 (2.8- 1.0+) 990105 504 0.3- 0.8- 990216 071 0.4+ 0.5+ 981228 958 (0.7+ 2.5+) 990105 504 0.2- 0.9- 990216 071 0.4+ 0.3+ 981228 761 1.2+ 0.7+ 990105 504 0.5- 0.7- 990217 360 0.1+ 0.1- 981228 761 (1.6- 2.4+) 990105 504 0.5- 0.5- 990217 360 0.5+ 0.5- 981228 734 0.2- 0.0 990105 504 0.3- 0.6- 990217 071 1.3+ 0.1- 981228 734 0.4- 0.3- 990106 118 0.2- 0.4+ 990217 071 1.1+ 0.0 981228 734 0.5- 0.2- 990106 118 0.1- 0.0 990217 071 0.8+ 0.1- 981228 900 (2.5- 1.9+) 990108 372 (1.1- 2.1+) 990217 071 0.4+ 0.0 981228 900 (2.3- 1.6-) 990109 143 1.9+ 0.1- 990225 046 0.1- 0.4+ 981228 402 0.4- 0.3- 990109 143 0.9+ 0.1- 990225 046 0.0 0.3+ 981228 402 0.6- 1.1- 990110 355 0.3+ 0.9+ 990225 046 0.1- 0.2+ 981228 402 0.4- 0.6- 990110 355 0.7+ 0.2+ 990225 046 0.2- 0.1+ 981228 402 0.0 0.5- 990110 355 0.1- 0.3+ 990226 104 0.2- 0.0 981228 046 0.6- 0.5+ 990111 351 1.3+ 0.9- 990226 104 0.7- 1.0- 981228 046 0.5- 0.3- 990111 351 1.3+ 1.7- 990226 104 1.0- 0.0 981228 046 1.3- 0.0 990113 360 0.2- 0.5+ 990226 104 0.3- 0.3- 981228 046 0.1- 1.0- 990113 360 0.2- 0.4+ 990311 118 0.9+ 1.0- 981229 355 0.4- 1.0+ 990113 372 1.5- 1.9+ 990311 118 0.0 0.8- 981229 327 0.4- 0.6+ 990114 143 0.2- 1.4+ 990312 113 0.7+ 0.1- 981229 355 0.5- 0.8- 990114 143 1.0+ 0.6+ 990312 113 1.1+ 0.3- 981229 327 1.0- 0.1- 990116 118 0.7+ 0.3+ 990405 118 0.2+ 0.2- 981229 327 (0.6- 3.7+) 990116 118 0.6+ 0.5+ 990405 118 0.0 0.8- 981229 611 1.0- 0.7- 990117 402 0.1+ 0.2+ 990407 360 0.3+ 0.8- 981229 611 1.0+ 1.3+ 990117 402 0.0 0.0 990407 360 0.3- 0.4- 981229 611 0.6- 0.6- 990117 402 0.4+ 0.4+ 990407 360 0.0 0.4- 981230 897 0.6- 0.3- 990117 897 (1.5- 2.1-) 990408 402 0.0 0.5- 981230 897 0.5- 1.0- 990117 897 1.3+ 0.6+ 990408 402 1.0+ 0.7- 981230 897 1.4- 0.6- 990117 113 1.4+ 0.4+ 990408 402 0.9- 0.1+ 981231 540 0.0 0.5+ 990117 113 1.7+ 0.6+ 2013/ 981231 540 0.8- 0.5+ 990120 610 (2.1+ 0.4-) 130509 Q62 1.3+ 0.5+ 981231 540 1.3+ 0.2- 990120 610 1.9+ 0.2- 130509 Q62 0.6+ 0.5+ 981231 046 0.3- 0.5+ 990120 610 1.5+ 0.1- 130716 I47 1.0+ 0.4- 981231 046 1.0- 0.3+ 990120 610 1.0+ 0.1+ 130716 I47 0.2- 0.2- 981231 046 1.1- 1.2+ 990120 610 0.7+ 0.3+ 130716 I47 1.3- 0.0 981231 046 1.2- 0.7+ 990120 046 0.1- 0.4+ 130724 E12 1.2- 0.4+ 1999/ 990120 046 0.2+ 0.3+ 130724 E12 0.2- 0.0 990104 372 1.5- 1.2+ 990120 046 0.0 0.3+ 130726 E12 0.1- 1.0- 990104 372 (2.5- 0.4-) 990121 360 0.1+ 0.2+ 130726 E12 0.5+ 0.9- 990104 372 (3.1- 0.5+) 990121 360 0.1- 0.2+ 130726 E12 0.1- 0.9- 990104 587 0.1+ 0.4+ 990121 360 0.1- 0.3+ 130727 W86 0.2+ 0.2- 990104 587 0.9- 0.2- 990128 897 1.0- 0.2- 130727 W86 0.3+ 0.3- 990105 372 1.9- 0.9+ 990128 897 0.6+ 0.4- 130727 W86 0.6+ 0.2- 990105 402 0.8- 0.2+ 990128 367 0.7+ 0.7- 130727 W86 0.5+ 0.2- 990105 402 0.8- 0.1+ 990128 367 1.0+ 0.6+ 130727 W86 0.7+ 0.3- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2013 Aug. 14