Nakano Note (Nakano wa Kangaeru noda) NK 2887 198P/ODAS
The following improved orbital elements, by T. Kobayashi, are from 185 observations 1998 to 2011, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 0.58 arc second. The comet was observed only one night in the 2012 return. See the previous orbits in NK 844, NK 1595 and NK 1596 (= MPC 65937). Epoch = 2012 Feb. 3.0 TT T = 2012 Feb. 15.78433 +/- 0.00481 (m.e.) TT Peri. = 69.05520 +/- 0.00298 Node = 358.51358 +/- 0.00292 (2000.0) Inc. = 1.34132 +/- 0.00004 q = 1.9965861 +/- 0.0000187 AU e = 0.4449191 +/- 0.0000047 a = 3.5969281 +/- 0.0000457 AU n' = 0.14447957 +/- 0.00000279 P = 6.822 +/- 0.0001295 years A1 = -2.199 +/- 0.280 A2 = +1.01422 +/- 0.01225 A3 = -1.36752 +/- 0.02247 T = 1998 July 20.94716 TT Epoch = 1998 July 6.0 TT Peri. = 68.72532 e = 0.4481056 Node = 358.90630 (2000.0) a = 3.5772291 AU Inc. = 1.35180 n'= 0.14567464 q = 1.9742527 AU P = 6.766 years T = 2005 May 3.26016 TT Epoch = 2005 Apr. 20.0 TT Peri. = 69.05132 e = 0.4472213 Node = 358.72747 (2000.0) a = 3.5834256 AU Inc. = 1.34835 n'= 0.14529695 q = 1.9808413 AU P = 6.783 years The predicted orbit for the 2018 return is as follows: T = 2018 Dec. 13.88795 TT Epoch = 2018 Dec. 28.0 TT Peri. = 69.26805 e = 0.4432389 Node = 358.30381 (2000.0) a = 3.6028700 AU Inc. = 1.33784 n'= 0.14412230 q = 2.0059377 AU P = 6.839 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1998/ 981221 360 0.1- 0.5+ 990214 693 0.2+ 0.3- 981215 910 0.4+ 0.4- 981222 958 0.6+ 0.9+ 990214 693 0.1+ 0.3- 981215 910 0.1- 0.8- 981222 958 0.8- 0.5+ 990214 360 0.1+ 0.5- 981215 910 0.6+ 0.8- 981222 958 0.4+ 0.1+ 990214 360 0.2+ 0.3- 981216 046 0.5- 0.3+ 981224 360 0.2- 0.2+ 990214 360 0.0 0.7- 981216 046 0.7- 0.6- 981224 360 0.5- 0.6+ 990215 118 0.1+ 0.4- 981216 046 0.6+ 1.0- 981224 360 0.4+ 0.1+ 990215 118 0.2- 0.2+ 981216 557 0.4- 0.4- 981226 910 0.1- 0.2- 990216 691 0.8- 0.5- 981216 910 0.5+ 0.2- 981227 958 (0.1- 4.1+) 990216 691 0.3- 0.0 981216 046 0.5- 1.2- 981227 958 1.9- 0.6+ 990216 691 1.2- 0.3- 981216 046 1.0- 1.4- 981227 402 0.3+ 0.0 990216 615 0.4+ 0.4+ 981216 910 0.3+ 0.1- 981227 402 0.1+ 0.4- 990216 615 0.7+ 0.3- 981216 910 0.1+ 0.4- 981227 402 0.6+ 0.2+ 990216 615 0.2- 0.1+ 981216 910 0.1- 0.5- 1999/ 990216 615 0.3+ 0.2+ 981216 910 0.3- 1.1- 990107 897 1.6- 1.7+ 990216 615 0.2- 0.1+ 981216 586 0.7+ 0.3+ 990107 897 0.1+ 1.4+ 990216 615 0.3- 0.1- 981216 910 0.0 0.6- 990107 897 0.4- 1.6+ 990216 615 0.4- 0.1+ 981216 586 0.6+ 0.5+ 990110 372 0.4- 1.3+ 990216 615 0.9- 0.7+ 981216 586 0.7+ 0.3+ 990113 693 0.6- 0.0 990216 615 0.1+ 0.1+ 981216 586 0.8+ 0.5+ 990113 693 0.7- 0.0 990216 615 0.0 0.5+ 981216 586 0.6+ 0.3+ 990113 693 0.5- 0.1- 990216 615 0.1- 0.5+ 981216 586 0.4+ 0.3+ 990114 910 0.9+ 0.0 990216 615 0.7- 0.3+ 981216 586 0.3+ 0.5+ 990114 910 0.9+ 0.5- 990216 615 0.3- 0.2+ 981216 586 0.4+ 0.5+ 990114 910 0.5- 0.9- 990216 615 0.3- 0.1+ 981216 586 0.8+ 0.5+ 990115 910 0.1+ 0.9- 990216 615 0.2+ 0.5+ 981216 586 0.8+ 0.4+ 990115 910 0.6+ 0.7- 990223 897 (1.1+ 2.6+) 981216 586 0.6+ 0.5+ 990115 910 0.7+ 1.3- 990223 897 (3.1+ 0.2-) 981216 586 0.6+ 0.6+ 990115 910 0.1- 1.5- 990223 897 0.4+ 0.9- 981216 586 0.6+ 0.6+ 990115 910 0.2+ 1.3- 990316 402 0.4- 0.1+ 981216 611 0.2+ 0.7- 990115 910 0.2- 0.5- 990316 402 (0.6- 2.5-) 981217 611 (2.6- 0.8-) 990115 910 0.2- 1.1- 990316 402 (2.0- 1.3-) 981217 586 0.5- 0.2+ 990119 910 0.2+ 0.4+ 990404 402 (2.1- 0.2-) 981217 586 0.2+ 0.3+ 990119 910 0.3+ 0.2+ 990404 402 0.5- 0.5- 981217 046 0.9- 0.3- 990119 910 0.4+ 0.0 990414 693 (2.7- 1.0-) 981217 586 0.1- 0.0 990119 910 0.4- 0.0 990414 693 (5.6- 0.3+) 981217 046 0.8- 0.3+ 990119 910 0.1+ 0.2+ 2005/ 981217 046 0.4+ 0.0 990119 910 0.0 0.2+ 051007 G96 1.5- 1.8- 981217 586 0.0 0.2+ 990119 910 0.1- 0.1+ 051007 G96 0.7- 1.3- 981217 046 0.2+ 0.1+ 990119 910 0.1+ 0.2+ 051007 G96 0.9- 0.9- 981217 046 0.7+ 0.0 990119 910 0.1+ 0.0 051007 G96 1.0+ 1.6- 981217 586 0.4- 0.2+ 990119 910 0.1- 0.6+ 2006/ 981217 586 0.2- 0.3+ 990121 360 0.6+ 0.6- 060130 691 0.1- 0.0 981217 586 0.5- 0.4+ 990121 360 0.5+ 0.2- 060130 691 0.4- 0.3- 981217 586 0.3- 0.3+ 990121 360 0.1+ 0.4- 060130 691 0.4- 0.3- 981217 586 0.4- 0.4+ 990126 402 (2.3+ 0.8+) 060207 691 0.4- 0.2+ 981217 586 0.6- 0.2+ 990126 360 0.3+ 0.1+ 060207 691 0.4- 0.0 981217 586 0.1- 0.4+ 990126 360 0.2- 0.3- 060207 691 0.0 0.1+ 981217 586 0.1+ 0.2+ 990126 360 0.4+ 0.2- 060220 691 0.3+ 0.0 981218 511 0.2+ 0.6+ 990205 897 0.6+ 0.0 060220 691 0.0 0.0 981218 511 0.1+ 0.5+ 990205 897 0.5- 1.2- 060220 691 0.0 0.3+ 981218 511 0.0 0.3+ 990206 402 0.3+ 0.8- 060224 691 0.3+ 0.4+ 981218 511 0.1- 0.4+ 990206 402 0.8+ 0.3- 060224 691 0.3+ 0.2+ 981218 511 0.1- 0.5+ 990206 402 1.2+ 0.4+ 060224 691 0.7+ 0.9- 981218 511 0.1+ 0.5+ 990208 402 1.4+ 0.7- 060302 691 0.2- 0.1+ 981218 511 0.1- 0.5+ 990208 402 1.5+ 0.4- 060302 691 0.6+ 0.5+ 981218 511 0.1- 0.7+ 990208 402 1.3+ 0.7- 060302 691 0.4+ 0.4+ 981218 511 0.1- 0.6- 990212 699 0.6- 0.9+ 060323 G96 1.0- 0.3+ 981218 402 0.8- 0.5+ 990212 699 0.4- 0.1+ 060323 G96 0.6+ 0.2+ 981218 402 0.5- 0.3+ 990212 699 0.1- 0.0 060323 G96 1.0- 0.4+ 981218 402 0.3+ 0.2+ 990213 691 0.5- 0.2- 060323 G96 0.6+ 0.4+ 981218 402 0.4- 0.6+ 990213 691 0.7- 0.2- 060324 G96 0.2+ 0.1+ 981219 897 0.8- 1.6- 990213 691 0.1+ 0.1+ 060324 G96 1.3+ 0.0 981219 897 (3.2- 1.7-) 990213 691 0.3- 0.3- 060324 G96 0.3- 0.1+ 981219 372 (1.1+ 2.2+) 990213 691 0.8- 0.5+ 060324 G96 0.1+ 0.4+ 981219 372 0.7+ 1.8+ 990213 691 0.5- 0.5- 2011/ 981220 897 (3.7- 0.1-) 990213 691 0.8- 0.8+ 110730 958 0.1- 0.2+ 981221 372 (2.5+ 0.5+) 990213 691 0.4- 0.2- 110730 958 (1.8- 3.1-) 981221 360 0.8+ 0.8+ 990213 691 0.5+ 0.6+ 981221 360 0.5+ 0.2+ 990214 693 0.0 0.3- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2015 May 8