OAA computing section circular NK 797 111P/Helin-Roman-Crockett
The following improved orbital elements, by S. Nakano, are from 118 observations 1989-1998. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.84 arc second. Epoch = 1996 Nov. 13.0 TT T = 1996 Oct. 31.78565 +/- 0.00111 (m.e.) TT Peri. = 10.13280 +/- 0.00038 Node = 91.98916 +/- 0.00035 (2000.0) Inc. = 4.23110 +/- 0.00003 q = 3.4896122 +/- 0.0000012 AU e = 0.1387100 +/- 0.0000003 a = 4.0516111 +/- 0.0000005 AU n' = 0.12085439 +/- 0.00000002 P = 8.155 +/- 0.0000014 years T = 1988 Sept.13.30351 TT Epoch = 1988 Aug. 27.0 TT Peri. = 10.21516 e = 0.1414064 Node = 92.00766 (2000.0) a = 4.0421091 AU Inc. = 4.23396 n'= 0.12128079 q = 3.4705289 AU P = 8.127 years The predicted orbit for the 2004 return is as follows: T = 2004 Dec. 27.15514 TT Epoch = 2004 Dec. 21.0 TT Peri. = 10.56505 e = 0.1402636 Node = 91.93756 (2000.0) a = 4.0400597 AU Inc. = 4.23300 n'= 0.12137309 q = 3.4733862 AU P = 8.120 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1989/ 890206 657 (0.8+ 2.5-) 951028 693 0.8+ 0.6+ 890102 675 (4.9+ 1.3+) 890206 657 (4.1+ 1.4+) 951028 693 0.6+ 0.0 890103 675 0.7- 2.0+ 890206 675 1.0- 1.8+ 951028 693 0.7+ 0.4+ 890103 675 0.3+ 0.6+ 890206 675 0.5- 0.1+ 951116 360 0.8+ 1.2+ 890104 010 0.9- 0.7+ 890206 897 0.9- 1.1- 951116 360 0.6+ 0.2- 890106 801 0.9+ 0.6+ 890206 897 2.0- 0.6- 951116 360 0.1- 0.6+ 890107 675 1.0+ 1.6+ 890207 657 1.0- 0.7- 1996/ 890108 372 (4.6- 3.2-)Y 890208 801 1.1+ 0.2+ 960919 696 0.2- 0.4- 890109 400 0.8- 0.1- 890211 675 0.9+ 1.2+ 960919 696 0.8- 0.3- 890109 400 1.2+ 0.9+ 890211 675 0.7+ 0.4+ 960919 696 0.1+ 0.9- 890111 801 1.3+ 0.1- 890225 046 1.2+ 0.8- 960922 691 0.9- 0.7- 890112 372 1.5- 0.7- 890225 046 1.3+ 0.1- 960922 691 0.1- 0.3- 890112 372 0.5- 0.2- 890301 675 0.8+ 0.6- 961117 691 0.2- 0.1- 890113 400 0.2- 1.3+ 890303 801 1.3+ 0.9+ 961117 691 0.9- 0.0 890113 400 1.0- 0.8- 890305 675 2.1+ 1.7- 961214 691 0.0 0.8+ 890114 293 0.1+ 0.3+ 890305 046 1.5+ 0.6- 961214 691 0.1- 0.6+ 890115 674 0.3- 1.5+ 890305 046 (2.7+ 0.7-) 961214 691 0.0 0.7+ 890116 897 2.0- 0.4+ 890308 897 1.9- 0.6- 961214 402 0.5- 0.0 890116 897 2.1- 0.7+ 890310 801 0.7- 0.3- 961214 402 0.1+ 0.0 890125 046 1.7+ 0.1- 890310 373 1.8+ 1.1- 961214 402 0.9- 0.4+ 890125 046 1.6+ 0.0 890310 373 0.0 0.5- 1997/ 890126 046 0.5- 1.0- 890329 373 (5.0+ 1.3+) 970111 360 0.4- 0.8+ 890126 046 1.2- 0.2+ 890329 373 (6.0+ 0.8-) 970111 360 0.2+ 0.5- 890127 887 0.5+ 1.7+ 890403 801 1.6+ 1.3- 970112 867 1.0+ 0.3- 890127 887 1.1- 0.0 890405 675 1.3- 1.5- 970112 867 0.0 0.8- 890127 887 0.2+ 1.6- 890407 675 1.0- 1.5- 970112 867 0.3- 0.7- 890127 887 0.6+ 0.6- 890408 675 0.4+ 1.3- 970116 691 0.7- 0.1- 890127 046 (1.0- 2.2-) 890508 801 (3.9+ 1.3+) 970116 691 0.9- 0.2- 890127 046 0.4- 1.2- 1993/ 970116 402 0.5- 0.0 890128 897 (2.4- 0.2+) 930625 691 (2.9- 0.5-) 970116 402 0.3- 0.1+ 890128 405 1.8- 1.0+ 930625 691 (4.5- 0.5-) 970116 402 1.2- 1.1+ 890128 405 (7.2- 0.3+) 930626 691 0.6+ 1.0- 970201 360 0.6+ 0.4+ 890128 405 (4.7- 0.0 ) 930626 691 1.0+ 0.4+ 970201 360 0.5- 0.5- 890128 897 1.1- 1.6- 930626 691 0.4- 0.0 1998/ 890129 400 (2.0- 3.4+) 930626 691 0.4+ 0.4+ 980225 954 0.5+ 0.2+ 890129 400 0.2+ 1.1+ 930720 691 2.0- 0.1- 980225 954 0.5+ 0.1+ 890129 400 1.2+ 0.0 930720 691 1.4- 0.0 980225 954 0.5+ 0.2+ 890129 405 (0.5- 2.9-) 930720 691 0.7+ 0.4+ 980225 954 0.5+ 0.2+ 890129 405 1.7+ 0.6+ 1994/ 980225 954 0.5+ 0.2+ 890130 400 0.1- 0.9+ 940906 691 1.6- 0.8+ 980225 954 0.5+ 0.0 890130 400 0.4- 0.0 940906 691 1.0- 0.3+ 980225 954 0.5+ 0.1+ 890131 046 (4.2+ 2.2-) 940906 691 0.9- 0.3- 980225 954 0.7+ 0.1+ 890201 405 (0.7- 2.2-) 1995/ 980225 954 0.7+ 0.1+ 890201 405 1.1+ 0.6- 950902 691 0.3+ 0.5+ 980225 954 0.7+ 0.1+ 890201 046 (4.2- 3.4+) 950902 691 0.2+ 0.6+ 980225 954 0.7+ 0.1+ 890201 046 (4.6- 5.3+) 950902 691 0.9+ 0.2+ 980225 954 0.7+ 0.1+ 890203 400 (3.5+ 3.0+) 950902 691 0.5+ 0.3+ 980228 691 0.5- 0.6+ 890203 400 (4.0+ 2.8+) 951021 691 0.6+ 0.2- 980228 691 0.3- 1.1+ 890204 801 0.3- 0.9- 951021 691 0.2+ 0.2- 980228 691 0.2- 0.7+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2001 Apr. 28