Nakano Note (Nakano wa Kangaeru noda) NK 1780 P/1999 D1 (Hermann)
The following improved orbital elements, by S. Nakano, are from 113 observations 1999 Feb. 15 to Apr. 14. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.80 arc second. Epoch = 1999 Mar. 3.0 TT T = 1999 Feb. 18.02943 +/- 0.00304 (m.e.) TT Peri. = 173.09887 +/- 0.00165 Node = 349.37532 +/- 0.00055 (2000.0) Inc. = 21.52145 +/- 0.00228 q = 1.6545889 +/- 0.0000724 AU e = 0.7127241 +/- 0.0001197 a = 5.7595816 +/- 0.0004187 AU n' = 0.07130462 +/- 0.00000778 P = 13.822 +/- 0.0015071 years (+/- 0.55 day) The predicted orbit for the 2012 return is as follows: T = 2012 Dec. 18.40301 TT Epoch = 2012 Dec. 19.0 TT Peri. = 173.95677 e = 0.7137827 Node = 348.78794 (2000.0) a = 5.7432482 AU Inc. = 21.34837 n'= 0.07160901 q = 1.6438169 AU P = 13.764 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1999/ 990224 120 0.4- 0.6- 990316 372 0.5- 0.7- 990215 411 2.0- 1.1+ 990224 120 0.8- 0.9- 990316 897 0.6- 0.1- 990220 699 0.7+ 1.5+ 990224 120 0.5- 0.6- 990316 897 (0.1+ 3.4+) 990220 699 1.2+ 1.4+ 990224 372 0.4+ 0.9+ 990316 360 0.0 0.3- 990220 699 1.3+ 0.2+ 990224 372 0.3- 0.1- 990316 360 0.1+ 0.2- 990220 557 0.3+ 0.0 990224 046 0.8+ 0.2+ 990316 360 0.3- 0.2+ 990220 557 0.1- 0.6+ 990224 046 0.5+ 0.2- 990317 402 1.3+ 0.5- 990220 557 0.3- 0.6- 990224 046 0.8+ 0.2+ 990317 402 0.7+ 0.8- 990220 557 0.7- 0.2- 990224 046 0.1+ 1.0+ 990317 402 0.1- 1.1+ 990220 557 1.4- 0.5+ 990225 118 0.2+ 1.8- 990318 428 1.6+ 1.6+ 990220 557 0.5- 0.3- 990225 118 0.9- 1.4- 990318 046 0.4+ 0.7- 990221 691 0.9+ 0.2- 990225 118 1.7- 0.7- 990318 046 1.0+ 0.2- 990221 691 0.5+ 0.2- 990225 402 0.6- 1.6- 990318 046 0.7+ 0.3+ 990221 691 0.5+ 0.4- 990225 402 1.2- 1.7- 990318 046 0.6+ 0.9- 990221 897 0.1+ 0.5+ 990225 402 1.6- 1.7- 990322 704 0.1+ 0.7- 990221 897 0.0 1.3+ 990225 897 1.6- 1.5+ 990322 704 0.2- 1.1+ 990221 897 0.4- 1.0+ 990225 897 0.1+ 0.2- 990322 704 0.2+ 1.1+ 990221 372 2.0- 0.1- 990225 897 (0.2+ 3.3+) 990322 704 0.8- 1.9+ 990221 897 0.2+ 0.2+ 990225 897 (3.7- 2.6+) 990322 704 0.5- 0.7+ 990221 372 0.5- 0.6+ 990226 046 0.4+ 0.7+ 990322 897 0.6- 0.3- 990221 372 (0.6+ 3.5+) 990226 046 0.4+ 0.1+ 990322 360 0.0 0.2- 990222 859 0.2- 0.4- 990226 046 0.5+ 1.3+ 990322 360 0.4- 0.2+ 990222 859 0.1+ 0.1- 990226 120 (3.2- 0.6-) 990322 360 0.5- 0.0 990222 859 0.5+ 0.4+ 990226 120 1.3- 2.0- 990322 897 1.0- 0.1- 990222 711 0.5+ 0.5+ 990227 120 (3.1- 2.4-) 990322 897 0.9+ 0.4+ 990222 711 0.5+ 0.5+ 990227 120 (1.2- 2.3-) 990322 372 0.1- 0.7+ 990222 711 0.5+ 0.5+ 990313 113 1.0- 1.0- 990326 860 1.9+ 1.1- 990222 402 1.5+ 0.5- 990313 113 0.7- 1.0- 990326 860 (0.2+ 2.1+) 990222 402 0.0 0.6+ 990313 367 1.3- 0.9- 990326 860 (3.0+ 0.1-) 990222 355 0.9- 0.1- 990313 367 0.7- 0.0 990404 402 0.0 0.0 990222 402 0.6+ 0.1+ 990313 104 0.6+ 1.4- 990404 402 0.4- 1.5+ 990222 355 0.3+ 0.0 990313 104 0.5+ 0.4- 990404 402 1.1- 1.2+ 990222 355 0.0 0.4- 990313 104 0.7+ 0.1- 990407 360 0.5- 0.3+ 990222 372 0.5+ 0.8+ 990315 108 0.6- 1.0+ 990407 360 0.5- 0.2- 990222 372 1.3+ 0.1+ 990315 108 (7.3- 1.9+) 990407 360 0.4- 0.6- 990223 118 1.8+ 0.1- 990315 108 (1.2+ 2.2+) 990414 693 0.4- 0.2+ 990223 118 1.5+ 0.4+ 990315 118 1.1+ 0.6+ 990414 693 0.3- 0.1+ 990223 118 0.3+ 0.3+ 990315 118 0.3+ 0.3- 990414 693 0.4- 0.2- 990223 411 1.4- 0.5+ 990315 118 0.8+ 0.1- 990414 360 0.0 0.8- 990223 411 0.1+ 0.4- 990316 402 0.7+ 0.4+ 990414 360 0.4- 0.0 990223 411 1.1- 0.9- 990316 402 0.8+ 0.1- 990414 360 0.4+ 0.5- 990224 120 0.9- 0.4- 990316 402 1.4+ 0.4- ( ) -------- Rejected Obs.
Managing Director of the Oriental Astronomical Association Syuichi Nakano 2009 Apr. 24