OAA computing section circular NK 1374 178P/Hug-Bell (1999 X1 = 2006 O1)
The following improved orbital elements, by S. Nakano, are from 139 observations 1999 to 2006. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.73 arc second. See previous orbits in NK 733 (= HICQ 2006) and YC 2521. Epoch = 2006 July 4.0 TT T = 2006 July 6.55781 +/- 0.00112 (m.e.) TT Peri. = 296.87352 +/- 0.00060 Node = 103.64801 +/- 0.00007 (2000.0) Inc. = 10.96282 +/- 0.00005 q = 1.9469672 +/- 0.0000063 AU e = 0.4709734 +/- 0.0000017 a = 3.6802822 +/- 0.0000046 AU n' = 0.13959902 +/- 0.00000026 P = 7.060 +/- 0.0000132 years T = 1999 June 20.83750 TT Epoch = 1999 July 1.0 TT Peri. = 296.91592 e = 0.4727598 Node = 103.65098 (2000.0) a = 3.6733507 AU Inc. = 10.96867 n'= 0.13999434 q = 1.9367381 AU P = 7.040 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1999/ 991229 402 0.1- 1.0+ 060725 734 0.7- 1.0+ 991010 704 0.2+ 0.5+ 991229 402 0.1+ 1.2+ 060725 734 0.6+ 0.6- 991010 704 0.6+ 0.3+ 991229 402 (1.2- 2.1+) 060730 734 0.9+ 0.1- 991010 704 0.2+ 0.7+ 991231 734 (2.1- 0.2+) 060730 734 0.8+ 0.5- 991207 704 0.9+ 1.6- 991231 734 1.5- 0.8+ 060806 H36 1.3- 0.7- 991207 704 0.0 0.1+ 2000/ 060806 H36 (2.8- 2.6-) 991207 704 0.1- 0.8+ 000103 897 (2.7- 1.9+) 060806 H36 1.0+ 1.1- 991210 734 0.4+ 0.4- 000103 897 1.6- 0.7- 060823 734 0.4+ 0.0 991210 734 0.7+ 0.6- 000103 897 1.1- 1.0+ 060823 734 0.4+ 0.1- 991210 734 0.3- 0.2- 000103 372 (5.4- 1.7+) 060824 734 0.0 0.4- 991210 734 0.5- 0.3- 000104 360 0.6+ 0.2+ 060824 734 0.2+ 0.5- 991210 734 0.2+ 0.6- 000104 897 0.9- 1.0+ 060824 734 0.0 0.4- 991210 734 0.5+ 0.3+ 000104 360 0.4+ 0.5+ 060830 734 0.3+ 0.2- 991210 734 0.4- 0.2+ 000104 360 0.2+ 0.1- 060830 734 0.4+ 0.1- 991210 734 0.1+ 0.1- 000104 402 0.7+ 0.5- 060830 734 0.1+ 0.2- 991211 557 0.1+ 0.6+ 000104 402 0.3+ 0.2- 060902 130 0.5+ 0.4+ 991211 557 0.2+ 0.2+ 000104 897 0.8- 0.1+ 060902 130 0.4- 0.5- 991211 557 0.3+ 0.5+ 000104 402 0.6+ 0.6- 060902 204 0.4- 0.3- 991211 734 0.2- 0.6- 000104 897 0.4- 0.9- 060902 130 0.7- 0.6- 991211 734 1.7- 0.6+ 000105 587 0.0 0.1+ 060902 204 0.2- 0.4- 991211 734 0.1- 0.4- 000105 587 0.1+ 0.2+ 060902 H36 0.9+ 0.0 991211 734 0.4- 1.4- 000106 587 1.2- 0.3- 060902 H36 0.6- 0.4+ 991211 734 1.8- 0.5+ 000107 734 0.0 1.2- 060902 H36 1.2+ 0.2- 991211 118 0.3- 0.4- 000107 734 1.3- 1.0+ 060904 A79 0.4+ 0.9+ 991211 118 1.2- 0.7+ 000107 734 0.7+ 0.7- 060904 A79 1.5- 1.6+ 991211 118 0.3+ 0.8+ 000107 734 0.5- 0.7- 060904 A79 0.0 0.1+ 991213 734 0.4+ 0.2- 000107 587 1.0+ 1.0+ 060905 H36 1.0+ 0.1+ 991213 734 0.6+ 0.6- 000107 587 1.6+ 0.2- 060905 H36 0.0 0.1+ 991213 734 0.1- 0.4- 000107 587 1.5+ 0.2- 060905 H36 0.3- 0.0 991215 372 1.1- 1.0+ 000111 695 0.8+ 0.5- 060919 734 0.1- 0.0 991215 372 1.4- 1.1+ 000111 695 (1.2+ 2.5-) 060919 734 0.2+ 0.2+ 991215 360 0.9+ 0.6+ 000111 695 0.5+ 0.2+ 060919 734 0.5+ 0.1- 991215 360 1.1+ 0.2+ 000111 695 0.6+ 0.3- 060919 734 0.5+ 0.2- 991215 360 1.2+ 0.0 000116 734 0.8+ 0.2- 060919 734 0.9+ 0.0 991215 897 1.2- 0.2+ 000116 734 1.6- 0.5+ 060919 734 0.2+ 0.2+ 991215 897 0.7- 0.2+ 000126 402 1.0+ 0.4+ 060928 H36 1.2- 0.6+ 991215 897 (2.5- 0.4-) 000126 402 0.5+ 1.3+ 060928 H36 0.5+ 0.4+ 991217 046 0.8+ 0.2- 000126 402 0.7+ 0.3- 060928 H36 0.3- 0.1+ 991217 046 0.9- 0.6+ 000128 360 1.0+ 0.3+ 060928 H36 0.3+ 0.2+ 991217 046 0.4- 1.1- 000128 360 0.3+ 0.1+ 060928 H36 0.2- 0.3+ 991217 734 (2.0+ 2.5-) 000128 360 0.9+ 0.4- 060928 H36 0.5+ 0.8+ 991217 734 1.2- 0.6- 000207 734 0.8+ 1.2- 061007 585 0.6- 0.4- 991217 734 1.1+ 0.3- 000207 734 0.4+ 0.1- 061008 585 (2.5- 1.2+) 991217 734 0.8- 0.6- 000207 734 0.2+ 0.8+ 061008 585 0.0 1.4- 991219 411 0.0 0.1- 2006/ 061008 585 (3.6- 0.5-) 991219 411 1.0+ 1.3+ 060716 734 (1.7+ 2.0-) 061012 850 0.3- 0.6+ 991219 411 0.0 0.9+ 060716 734 1.0+ 1.0- 061012 850 0.2- 0.1+ 991226 734 0.3+ 1.9- 060717 734 1.1- 0.3+ 061012 850 0.2+ 0.1+ 991226 734 0.7- 1.8- 060717 734 1.5- 0.0 061013 734 0.7- 0.5- 991226 734 1.3- 1.9+ 060722 734 1.1- 0.7- 061013 734 0.4- 0.6- 991226 734 0.8- 1.7- 060722 734 0.4- 1.6+ 061013 734 0.6+ 1.0+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2006 Oct. 30