OAA computing section circular NK 1271 111P/Helin-Roman-Crockett
The following improved orbital elements, by S. Nakano, are from 126 observations 1989 to 2001. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.86 arc second. See an orbit in NK 797 (= HICQ 2002). Epoch = 2004 Dec. 21.0 TT T = 2004 Dec. 27.15929 +/- 0.00115 (m.e.) TT Peri. = 10.56557 +/- 0.00038 Node = 91.93769 +/- 0.00035 (2000.0) Inc. = 4.23300 +/- 0.00003 q = 3.4733871 +/- 0.0000012 AU e = 0.1402634 +/- 0.0000003 a = 4.0400597 +/- 0.0000005 AU n' = 0.12137309 +/- 0.00000002 P = 8.120 +/- 0.0000015 years T = 1988 Sept.13.30749 TT Epoch = 1988 Aug. 27.0 TT Peri. = 10.21567 e = 0.1414062 Node = 92.00779 (2000.0) a = 4.0421092 AU Inc. = 4.23397 n'= 0.12128079 q = 3.4705299 AU P = 8.127 years T = 1996 Oct. 31.78984 TT Epoch = 1996 Nov. 13.0 TT Peri. = 10.13333 e = 0.1387098 Node = 91.98928 (2000.0) a = 4.0516112 AU Inc. = 4.23110 n'= 0.12085439 q = 3.4896132 AU P = 8.155 years The predicted orbit for the 2013 return is as follows: T = 2013 Jan. 30.66251 TT Epoch = 2013 Jan. 28.0 TT Peri. = 3.37927 e = 0.1096296 Node = 89.79427 (2000.0) a = 4.1603830 AU Inc. = 4.22882 n'= 0.11614596 q = 3.7042819 AU P = 8.486 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 897 0.9- 1.1- 960919 696 0.7- 0.3- 890102 675 (5.0+ 1.3+) 890206 897 2.0- 0.6- 960919 696 0.2+ 0.8- 890103 675 0.7- 2.1+ 890207 657 1.0- 0.7- 960922 691 0.8- 0.7- 890103 675 0.3+ 0.6+ 890208 801 1.1+ 0.2+ 960922 691 0.0 0.3- 890104 010 0.8- 0.7+ 890211 675 1.0+ 1.2+ 961117 691 0.0 0.0 890106 801 0.9+ 0.6+ 890211 675 0.8+ 0.4+ 961117 691 0.7- 0.0 890107 675 1.1+ 1.6+ 890225 046 1.3+ 0.7- 961214 691 0.2+ 0.8+ 890108 372 (4.6- 3.2-)Y 890225 046 1.3+ 0.1- 961214 691 0.0 0.6+ 890109 400 0.7- 0.1- 890301 675 0.8+ 0.6- 961214 691 0.1+ 0.7+ 890109 400 1.3+ 0.9+ 890303 801 1.3+ 0.9+ 961214 402 0.3- 0.0 890111 801 1.4+ 0.1- 890305 675 2.1+ 1.7- 961214 402 0.3+ 0.1+ 890112 372 1.5- 0.7- 890305 046 1.6+ 0.6- 961214 402 0.7- 0.4+ 890112 372 0.5- 0.2- 890305 046 (2.8+ 0.7-) 1997/ 890113 400 0.1- 1.3+ 890308 897 1.9- 0.6- 970111 360 0.2- 0.8+ 890113 400 0.9- 0.8- 890310 801 0.6- 0.3- 970111 360 0.3+ 0.5- 890114 293 0.2+ 0.3+ 890310 373 1.9+ 1.1- 970112 867 1.2+ 0.3- 890115 674 0.2- 1.5+ 890310 373 0.0 0.5- 970112 867 0.1+ 0.8- 890116 897 2.0- 0.4+ 890329 373 (5.1+ 1.3+) 970112 867 0.1- 0.7- 890116 897 2.0- 0.7+ 890329 373 (6.0+ 0.8-) 970116 691 0.5- 0.1- 890125 046 1.8+ 0.1- 890403 801 1.7+ 1.3- 970116 691 0.7- 0.1- 890125 046 1.6+ 0.0 890405 675 1.3- 1.5- 970116 402 0.3- 0.0 890126 046 0.4- 1.0- 890407 675 0.9- 1.4- 970116 402 0.2- 0.1+ 890126 046 1.1- 0.2+ 890408 675 0.5+ 1.3- 970116 402 1.0- 1.1+ 890127 887 0.6+ 1.7+ 890508 801 (3.9+ 1.3+) 970201 360 0.7+ 0.5+ 890127 887 1.0- 0.0 1993/ 970201 360 0.4- 0.4- 890127 887 0.3+ 1.6- 930625 691 (4.0- 0.8-) 1998/ 890127 887 0.7+ 0.6- 930625 691 (5.6- 0.8-) 980225 954 0.2+ 0.3+ 890127 046 0.9- 2.2- 930626 691 0.5- 1.3- 980225 954 0.2+ 0.2+ 890127 046 0.4- 1.2- 930626 691 0.1- 0.1+ 980225 954 0.2+ 0.3+ 890128 897 (2.3- 0.3+) 930626 691 1.5- 0.3- 980225 954 0.2+ 0.3+ 890128 405 1.8- 1.0+ 930626 691 0.7- 0.1+ 980225 954 0.2+ 0.2+ 890128 405 (7.1- 0.4+) 930720 691 (3.2- 0.4-) 980225 954 0.2+ 0.1+ 890128 405 (4.6- 0.0 ) 930720 691 (2.6- 0.3-) 980225 954 0.2+ 0.2+ 890128 897 1.1- 1.6- 930720 691 0.5- 0.1+ 980225 954 0.4+ 0.2+ 890129 400 (1.9- 3.5+) 1994/ 980225 954 0.4+ 0.2+ 890129 400 0.3+ 1.1+ 940906 691 (2.5- 0.4+) 980225 954 0.4+ 0.2+ 890129 400 1.2+ 0.0 940906 691 1.9- 0.1- 980225 954 0.4+ 0.2+ 890129 405 (0.4- 2.9-) 940906 691 1.7- 0.6- 980225 954 0.4+ 0.2+ 890129 405 1.8+ 0.6+ 1995/ 980228 691 0.8- 0.7+ 890130 400 0.0 0.9+ 950902 691 0.0 0.4+ 980228 691 0.5- 1.2+ 890130 400 0.4- 0.0 950902 691 0.1- 0.6+ 980228 691 0.5- 0.8+ 890131 046 (4.2+ 2.2-) 950902 691 0.6+ 0.1+ 2001/ 890201 405 0.6- 2.2- 950902 691 0.2+ 0.3+ 010727 809 1.5+ 0.1- 890201 405 1.2+ 0.6- 951021 691 0.3+ 0.3- 010727 809 1.5+ 0.0 890201 046 (4.1- 3.4+) 951021 691 0.1- 0.3- 010727 809 1.6+ 0.1+ 890201 046 (4.5- 5.3+) 951028 693 0.4+ 0.6+ 010727 809 1.4+ 0.3- 890203 400 (3.6+ 3.0+) 951028 693 0.3+ 0.0 010727 809 1.6+ 0.2+ 890203 400 (4.1+ 2.8+) 951028 693 0.4+ 0.4+ 010919 809 0.3- 0.3- 890204 801 0.3- 0.8- 951116 360 0.5+ 1.2+ 010920 809 0.6- 0.1+ 890206 657 (0.8+ 2.5-) 951116 360 0.3+ 0.2- 010920 809 1.6- 0.2+ 890206 657 (4.1+ 1.4+) 951116 360 0.4- 0.6+ 010920 809 0.1+ 0.5- 890206 675 0.9- 1.8+ 1996/ 890206 675 0.4- 0.1+ 960919 696 0.1- 0.4- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2005 Oct. 26