OAA computing section circular NK 1695 208P/McMillan (2008 U1 = 29N28W = 2A218D) [Temporary numbered]
The following improved orbital elements, by S. Nakano, are from 103 observations 2000 - 2008. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.66 arc second. The 2000 observations as shown below were found in one night observations by Nakano. The positions run off R.A. +0.45 and Decl. +0.12 deg from an orbit determined by the arc of 2008 Sept. 20 - Nov. 21. The delta-T correction was +1.19 days. 29N28W C2000 09 23.20248 23 09 38.53 -09 03 32.6 18.1 R 699 29N28W C2000 09 23.21798 23 09 37.84 -09 03 39.7 699 29N28W C2000 09 23.23342 23 09 37.45 -09 03 43.4 699 29N28W C2000 09 23.24886 23 09 36.96 -09 03 50.6 699 2A218D C2000 10 02.18685 23 05 32.41 -09 50 41.0 18.3 R 699 2A218D C2000 10 02.20628 23 05 32.03 -09 50 44.1 699 2A218D C2000 10 02.22565 23 05 31.36 -09 50 51.9 699 2A218D C2000 10 02.24506 23 05 31.00 -09 50 57.4 699 Epoch = 2008 May 14.0 TT T = 2008 May 13.25731 +/- 0.01882 (m.e.) TT Peri. = 310.48359 +/- 0.00211 Node = 36.41779 +/- 0.00038 (2000.0) Inc. = 4.41283 +/- 0.00045 q = 2.5248273 +/- 0.0000872 AU e = 0.3744070 +/- 0.0000126 a = 4.0358946 +/- 0.0000400 AU n' = 0.12156102 +/- 0.00000181 P = 8.108 +/- 0.0001206 years (+/- 0.04 day) T = 2000 Dec. 8.97447 TT Epoch = 2000 Dec. 2.0 TT Peri. = 217.37681 e = 0.3506717 Node = 152.99709 (2000.0) a = 4.1479280 AU Inc. = 7.14334 n'= 0.11666948 q = 2.6933671 AU P = 8.448 years The predicted orbit for the 2016 return is as follows: T = 2016 July 1.58562 TT Epoch = 2016 June 21.0 TT Peri. = 310.52189 e = 0.3721989 Node = 36.41615 (2000.0) a = 4.0526027 AU Inc. = 4.40585 n'= 0.12081004 q = 2.5442284 AU P = 8.158 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2000/ 081025 B37 0.4+ 0.3+ 081104 850 0.0 0.2- 000923 699 1.2+ 0.5+ 081025 B37 0.7+ 0.5+ 081107 204 0.5+ 0.1+ 000923 699 1.6- 1.2- 081026 B37 1.2+ 0.1+ 081108 204 0.5+ 0.0 000923 699 0.0 0.4+ 081026 204 0.3+ 0.0 081108 691 0.3+ 0.4+ 000923 699 0.1+ 1.4- 081026 204 0.3+ 0.0 081108 691 0.6- 0.2+ 001002 699 0.2+ 0.7+ 081026 673 0.4+ 0.3+ 081108 691 0.1+ 0.3+ 001002 699 (1.8+ 3.0+) 081026 704 0.8+ 0.4+ 081113 473 0.7+ 0.1- 001002 699 0.8- 0.6+ 081026 673 0.2+ 0.1+ 081114 473 0.8- 0.1+ 001002 699 1.1+ 0.5+ 081026 704 0.3+ 0.6+ 081114 473 0.8- 0.0 2008/ 081026 673 0.0 0.1+ 081114 J47 0.1+ 0.8- 080920 691 0.4+ 0.4- 081026 673 0.3- 0.0 081116 104 1.1+ 1.3+ 080920 691 0.9- 1.0- 081026 704 0.6+ 0.6+ 081116 104 1.5+ 0.6+ 080920 691 0.2- 0.5- 081026 704 0.1+ 0.6- 081116 104 0.1+ 0.9+ 081006 691 (2.2- 0.8-) 081026 704 1.0+ 0.3+ 081118 H45 0.6- 0.4- 081006 691 1.5- 1.2- 081026 104 0.4- 0.5+ 081118 H45 0.1+ 0.5- 081006 691 1.0- 0.4- 081026 104 0.3+ 0.1- 081118 H45 0.1- 0.3+ 081010 691 1.6- 0.6- 081026 104 0.2- 0.0 081118 H45 0.1+ 0.2+ 081010 691 1.1- 0.4- 081026 473 0.3+ 0.2- 081118 H45 0.5+ 0.6- 081010 691 0.9- 0.5- 081027 372 0.2+ 1.4+ 081118 585 (4.0+ 2.1-) 081019 291 0.7- 0.0 081027 372 0.7- 0.1- 081118 585 (2.3+ 2.1-) 081019 291 0.8- 0.1+ 081027 372 0.7- 0.5+ 081118 585 0.5+ 1.9- 081019 291 1.1- 0.3+ 081027 349 0.3- 0.2+ 081118 585 (0.4- 2.3-) 081020 G96 0.4+ 0.3- 081027 349 0.2- 0.1+ 081118 585 (1.2+ 2.2-) 081020 G96 0.5+ 0.2- 081027 349 0.7- 0.3- 081119 850 1.2+ 0.2- 081020 G96 0.6+ 0.1- 081030 703 0.5+ 1.0- 081119 850 0.6+ 0.1+ 081020 G96 0.3+ 0.2- 081030 703 0.4- 0.4- 081119 850 0.1- 0.3- 081021 691 1.2- 0.4- 081030 703 0.5- 0.4- 081119 900 0.1- 0.2- 081021 691 1.4- 1.0- 081030 850 0.1+ 0.2+ 081119 900 0.7+ 0.4- 081021 691 1.3- 0.2- 081030 850 0.7- 0.1+ 081119 130 1.9+ 0.5+ 081025 215 0.1- 0.1+ 081030 850 1.2- 0.4+ 081119 130 1.6+ 0.7+ 081025 215 0.4+ 0.2- 081101 704 0.4+ 0.6+ 081125 372 0.5+ 1.4- 081025 215 0.4+ 0.3- 081101 704 0.1- 1.2+ 081125 372 0.7- 0.5+ 081025 B49 0.3- 0.0 081101 704 0.2- 1.5+ 081127 E85 0.4- 0.5- 081025 213 0.3+ 0.8- 081101 704 1.1+ 1.3+ 081127 E85 0.0 0.9+ 081025 B49 0.8- 0.5+ 081101 704 0.5- 1.3+ 081127 E85 0.5- 0.2- 081025 213 0.6+ 0.6- 081102 B49 (0.1+ 2.2-) 081128 J79 0.8+ 0.1- 081025 473 0.0 0.1- 081104 850 0.1- 0.3- 081025 473 0.0 0.1- 081104 850 0.4+ 0.0 ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2008 Dec. 2