Nakano Note (Nakano wa Kangaeru noda) NK 2154 P/1998 Y2 (Li)
The following improved orbital elements, by S. Nakano, are from 134 observations 1998 Sept. 23 to 1999 Apr. 8. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.67 arc second. See same orbit on MPC 34421 (= HICQ 2010/2011). Epoch = 1998 Dec. 13.0 TT T = 1998 Dec. 17.80381 +/- 0.00326 (m.e.) TT Peri. = 318.98002 +/- 0.00129 Node = 91.83202 +/- 0.00117 (2000.0) Inc. = 24.32374 +/- 0.00045 q = 2.5188196 +/- 0.0001214 AU e = 0.5885479 +/- 0.0000133 a = 6.1217816 +/- 0.0000581 AU n' = 0.06507098 +/- 0.00000092 P = 15.147 +/- 0.0002156 years (+/- 0.08 day) The predicted orbit for the 2014 return is as follows: T = 2014 Feb. 3.97780 TT Epoch = 2014 Jan. 23.0 TT Peri. = 319.05418 e = 0.5878798 Node = 91.86432 (2000.0) a = 6.1204096 AU Inc. = 24.35708 n'= 0.06509286 q = 2.5223444 AU P = 15.142 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1998/ 990104 372 (2.3- 0.5-) 990120 610 1.0+ 0.1+ 980923 703 0.6- 1.1+ 990104 372 (3.0- 0.4+) 990120 610 0.7+ 0.3+ 980923 703 0.7- 0.5- 990104 587 0.2+ 0.3+ 990120 046 0.1- 0.3+ 981028 703 0.3+ 0.5+ 990104 587 0.8- 0.3- 990120 046 0.2+ 0.3+ 981028 703 0.9+ 0.2+ 990105 372 1.7- 0.8+ 990120 046 0.0 0.3+ 981029 703 0.4+ 0.1- 990105 402 0.7- 0.1+ 990121 360 0.1+ 0.1+ 981029 703 0.8+ 0.6+ 990105 402 0.7- 0.1+ 990121 360 0.1- 0.2+ 981226 662 0.3- 0.2+ 990105 402 0.7- 0.4+ 990121 360 0.1- 0.3+ 981226 662 0.2- 0.0 990105 351 0.2- 0.7- 990128 367 0.6+ 0.7- 981227 662 0.0 0.5- 990105 351 1.9- 1.1- 990128 367 0.9+ 0.6+ 981227 662 0.2+ 0.7+ 990105 351 0.9- 0.6- 990128 367 1.1+ 0.6- 981227 662 0.7- 0.9+ 990105 367 0.0 0.3- 990204 402 0.8- 0.2- 981228 761 0.2- 0.3+ 990105 367 0.1+ 0.1- 990204 402 0.6- 0.1- 981228 958 (2.5- 0.9+) 990105 367 0.3+ 0.3- 990204 402 0.6- 0.1- 981228 958 (0.9+ 2.4+) 990105 118 0.1+ 0.6- 990205 372 0.8- 1.9+ 981228 761 1.4+ 0.7+ 990105 118 0.4+ 0.8- 990214 900 0.1- 0.7+ 981228 761 (1.4- 2.3+) 990105 540 1.4+ 1.7- 990214 900 (2.6+ 0.9-) 981228 734 0.0 0.0 990105 540 (0.9+ 2.2-) 990214 360 0.3- 0.1+ 981228 734 0.2- 0.3- 990105 540 0.2+ 0.1- 990214 360 0.2- 0.2+ 981228 734 0.2- 0.3- 990105 540 0.6+ 0.3- 990216 071 0.4+ 0.4- 981228 900 (2.3- 1.8+) 990105 504 0.1- 0.9- 990216 071 0.7+ 0.3- 981228 900 (2.1- 1.7-) 990105 504 0.1- 0.9- 990216 071 0.2+ 0.6+ 981228 402 0.2- 0.4- 990105 504 0.4- 0.7- 990216 071 0.2+ 0.4+ 981228 402 0.4- 1.2- 990105 504 0.3- 0.6- 990217 360 0.1- 0.0 981228 402 0.2- 0.7- 990105 504 0.1- 0.7- 990217 360 0.2+ 0.4- 981228 402 0.2+ 0.6- 990106 118 0.0 0.3+ 990217 071 1.1+ 0.1+ 981228 046 0.4- 0.4+ 990106 118 0.0 0.1- 990217 071 0.8+ 0.1+ 981228 046 0.2- 0.4- 990108 372 (1.0- 2.0+) 990217 071 0.5+ 0.0 981228 046 1.1- 0.1- 990109 143 (2.0+ 0.2-) 990217 071 0.2+ 0.1+ 981228 046 0.1+ 1.1- 990109 143 1.0+ 0.1- 990225 046 0.4- 0.5+ 981229 355 0.2- 0.9+ 990110 355 0.4+ 0.8+ 990225 046 0.2- 0.4+ 981229 327 0.2- 0.5+ 990110 355 0.8+ 0.1+ 990225 046 0.4- 0.4+ 981229 355 0.3- 0.9- 990110 355 0.0 0.2+ 990225 046 0.5- 0.2+ 981229 327 0.8- 0.2- 990111 351 1.4+ 0.9- 990226 104 0.5- 0.2+ 981229 327 (0.4- 3.6+) 990111 351 1.4+ 1.8- 990226 104 1.0- 0.8- 981229 611 0.8- 0.8- 990113 360 0.1- 0.4+ 990226 104 1.2- 0.2+ 981229 611 1.2+ 1.2+ 990113 360 0.1- 0.3+ 990226 104 0.6- 0.1- 981229 611 0.4- 0.7- 990113 372 1.4- 1.8+ 990311 118 0.6+ 0.7- 981230 897 0.4- 0.4- 990114 143 0.1- 1.3+ 990311 118 0.3- 0.5- 981230 897 0.3- 1.1- 990114 143 1.0+ 0.6+ 990312 113 0.3+ 0.2+ 981230 897 1.2- 0.7- 990116 118 0.8+ 0.3+ 990312 113 0.8+ 0.0 981231 540 0.2+ 0.4+ 990116 118 0.7+ 0.5+ 990405 118 0.2- 0.3+ 981231 540 0.6- 0.4+ 990117 402 0.1+ 0.2+ 990405 118 0.4- 0.3- 981231 540 1.5+ 0.3- 990117 402 0.0 0.1- 990407 360 0.0 0.3- 981231 046 0.2- 0.4+ 990117 402 0.5+ 0.3+ 990407 360 0.6- 0.1+ 981231 046 0.8- 0.2+ 990117 113 1.4+ 0.4+ 990407 360 0.3- 0.1+ 981231 046 0.9- 1.1+ 990117 113 1.7+ 0.5+ 990408 402 0.4- 0.1+ 981231 046 1.0- 0.6+ 990120 610 (2.1+ 0.4-) 990408 402 0.7+ 0.2- 1999/ 990120 610 1.9+ 0.3- 990408 402 1.3- 0.6+ 990104 372 1.3- 1.1+ 990120 610 1.5+ 0.1- ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Late edition Syuichi Nakano 1999 May 3