OAA computing section circular NK 654 76P/West-Kohoutek-Ikemura
The following improved orbital elements, by S. Nakano, are from 195 observations 1975-1994, 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 +/- 1.07 arc seconds. Epoch = 1994 Jan. 8.0 TT T = 1993 Dec. 25.34675 +/- 0.00061 (m.e.) TT Peri. = 359.97716 +/- 0.00036 Node = 84.16763 +/- 0.00006 (2000.0) Inc. = 30.54099 +/- 0.00006 q = 1.5767849 +/- 0.0000024 AU e = 0.5432827 +/- 0.0000007 a = 3.4524308 +/- 0.0000021 AU n' = 0.15364435 +/- 0.00000014 P = 6.415 +/- 0.0000059 years A1 = -0.039 +/- 0.040 A2 = -0.10017 +/- 0.00104 T = 1975 Feb. 25.78103 TT Epoch = 1975 Mar. 9.0 TT Peri. = 358.01898 e = 0.5817254 Node = 85.34384 (2000.0) a = 3.3430528 AU Inc. = 30.07918 n'= 0.16124610 q = 1.3983142 AU P = 6.112 years T = 1981 Apr. 11.07608 TT Epoch = 1981 Apr. 26.0 TT Peri. = 358.13926 e = 0.5812643 Node = 85.29571 (2000.0) a = 3.3450880 AU Inc. = 30.06515 n'= 0.16109896 q = 1.4007078 AU P = 6.118 years T = 1987 July 27.27194 TT Epoch = 1987 July 24.0 TT Peri. = 359.84589 e = 0.5444076 Node = 84.21319 (2000.0) a = 3.4473417 AU Inc. = 30.57783 n'= 0.15398470 q = 1.5705827 AU P = 6.401 years The predicted orbit for the 2000 return is as follows: T = 2000 June 1.18404 TT Epoch = 2000 May 16.0 TT Peri. = 0.07369 e = 0.5398391 Node = 84.12481 (2000.0) a = 3.4680307 AU Inc. = 30.49972 n'= 0.15260883 q = 1.5958521 AU P = 6.458 years The following residuals in seconds of arc are from the above orbital elements: 19/ 19/ 19/ 741015 809 (9.4+ 11.5+) 931023 411 2.0- 1.2+ 931212 107 0.1- 1.6+ 741015 809(16.3+ 10.4+) 931023 411 2.2- 0.1+ 931215 381 0.2+ 0.6+ 750227 029 (0.6+ 2.6-) 931023 411 1.7- 1.2+ 931215 381 0.1- 0.7+ 750227 029 (3.3+ 1.7-) 931108 658 0.9- 0.1- 931215 381 0.6- 0.3+ 750228 882 (4.2+ 0.9-) 931108 658 0.8- 0.1- 931215 323 1.5+ 0.9+ 750228 882 1.4+ 2.5- 931108 658 0.8- 0.1- 931216 107 0.2+ 0.5+ 750228 372 (6.8+ 0.6+) 931108 107 (3.7- 0.8+) 931216 107 0.2+ 1.3- 750303 380 (3.4+ 1.7+) 931108 107 (4.2- 1.9+) 931216 107 0.5+ 0.6+ 750303 380 (3.1+ 0.5+) 931111 801 1.6- 0.7+ 931217 816 0.5+ 0.4- 750303 372 (5.8+ 0.6+) 931111 801 1.0- 0.3+ 931217 801 0.5+ 0.2- 750303 372 (3.9+ 2.1-) 931114 411 1.3- 1.0+ 931217 816 0.3+ 0.6- 750304 801 0.0 1.0- 931114 411 1.3- 0.6+ 931217 801 0.5+ 0.2- 750305 801 0.0 1.2- 931114 411 1.3- 0.3+ 931217 897 0.6+ 1.6+ 750305 688 (5.4+ 2.9-) 931114 897 2.1- 1.6+ 931217 107 0.1- 0.3+ 750307 691 0.2- 1.3+ 931114 897 (2.3- 1.7+) 931217 107 0.0 0.1+ 750307 691 0.2- 1.3+ 931114 360 1.5- 0.1+ 931218 801 0.2+ 0.1+ 750307 372 2.1+ 0.6+ 931114 360 1.5- 0.6+ 931218 801 0.0 0.2+ 750307 372 2.3+ 1.0- 931115 900 1.5- 1.6+ 931218 107 1.1+ 0.0 750308 380 0.8+ 0.3- 931115 900 1.1- 1.1+ 931218 107 1.4+ 0.1+ 750308 380 1.2+ 1.4- 931116 900 1.0- 0.3+ 931219 411 0.8- 0.2- 750310 702 1.7+ 2.2- 931116 900 0.8- 1.3- 931219 411 0.3+ 0.5- 750310 702 1.0+ 0.7- 931116 107 (3.1- 2.0+) 931219 411 0.4+ 0.0 750314 702 1.0+ 2.4- 931117 107 1.4- 0.7+ 931229 897 1.1+ 0.7- 750314 702 (3.1+ 0.7+) 931117 801 1.2- 0.9+ 931229 897 1.5+ 0.3- 750316 372 (3.8+ 0.9-) 931117 801 1.3- 0.6+ 931230 107 1.6+ 1.7- 750316 372 (4.6+ 1.1+) 931118 897 (2.4- 0.4+) 931230 107 2.0+ 1.6- 750316 029 (0.4+ 2.9-) 931118 897 (2.5- 1.0+) 931230 107 1.2+ 1.5- 750320 029 0.7- 2.1- 931118 360 0.6- 0.2+ 931231 897 1.0+ 0.0 750321 029 0.2- 0.7- 931118 360 0.6- 0.2+ 940101 411 1.4+ 0.2+ 750331 029 1.7+ 0.7+ 931119 557 1.3- 0.9+ 940101 411 1.1+ 0.0 750411 774 0.6+ 0.3- 931119 557 1.1- 0.9+ 940101 411 1.0+ 1.0- 750412 210(13.2+ 5.4+) 931119 557 1.2- 1.0+ 940102 411 1.7+ 0.8- 750412 210 (7.9+ 10.5+) 931119 557 1.1- 0.9+ 940102 411 1.8+ 1.0+ 750418 801 1.0- 0.4- 931119 816 0.4- 0.3+ 940102 411 1.4+ 0.6+ 750509 693 0.8+ 1.3+ 931119 816 0.9- 0.1- 940102 900 0.7+ 0.4- 750517 691 0.1+ 2.5+ 931119 816 0.1- 0.5- 940102 900 1.5+ 0.6+ 750517 691 0.3- 2.2+ 931119 107 (2.1- 2.8+) 940104 897 2.1+ 0.6- 750530 801 0.6+ 2.3+ 931119 107 (1.7- 2.2+) 940104 897 2.2+ 1.0- 801009 323 0.3- 0.2- 931120 557 0.8- 0.7+ 940104 897 1.8+ 0.6- 801112 809 0.5- 0.2- 931120 557 0.9- 0.9+ 940104 360 1.3+ 0.8- 801112 809 (0.5- 3.6+) 931120 557 0.9- 0.7+ 940104 360 1.5+ 0.4- 801202 809 2.0- 1.7- 931120 323 0.0 1.6+ 940104 900 1.0+ 0.2- 801202 809 1.1- 0.0 931124 411 0.6- 0.6+ 940104 900 2.1+ 0.3+ 810215 675 (6.1- 9.7-) 931124 411 0.1+ 0.8+ 940108 410 (3.1+ 1.4-) 870927 691 1.6+ 0.5+ 931124 411 0.1- 0.8+ 940108 410 (3.2+ 2.7-) 870927 691 1.9+ 0.9+ 931124 897 (2.5- 1.8+) 940108 605 (3.5+ 1.2-) 871001 372 1.5+ 1.3+ 931124 897 1.4- 0.7+ 940108 605 (4.4+ 2.1-) 871221 691 0.1+ 2.3+ 931125 385 0.7- 0.6+ 940108 605 (4.6+ 1.7-) 871221 691 0.3- 2.0+ 931125 385 0.4- 0.6+ 940111 605 (2.7+ 3.5-) 880115 691 0.8+ 0.6+ 931125 385 0.5- 0.5+ 940111 605 (4.6+ 2.4-) 880115 691 0.5- 1.0+ 931202 107 0.6- 0.6+ 940111 605 (1.4+ 3.5-) 880115 691 1.8+ 0.5- 931204 897 0.8- 0.3+ 940113 107 (3.7+ 1.0-) 880121 691 1.0- 1.1+ 931204 897 1.6- 0.3+ 940113 107 (4.0+ 1.7-) 880121 691 (3.2- 3.5+) 931204 107 1.2- 0.8+ 940114 605 1.8+ 0.3- 880412 691 0.9- 0.6+ 931204 107 1.3+ 0.8+ 940114 605 (3.7+ 0.7-) 880412 691 0.0 0.5- 931205 411 0.6- 0.9+ 940114 605 (5.8+ 1.4-) 880412 691 0.9- 1.4- 931205 411 0.6- 0.8+ 940114 605 (6.0+ 0.2-) 930720 691 0.3- 1.2- 931205 411 0.5- 1.2+ 940115 410 (3.8+ 0.2-) 930720 691 0.3+ 0.2+ 931207 411 0.2- 0.2+ 940115 410 (3.0+ 0.8-) 930721 691 (0.0 2.5-) 931207 411 0.2- 0.8+ 940115 897 (2.6+ 0.5-) 930721 691 (2.4- 1.6-) 931207 411 0.1- 0.3+ 940115 897 (2.5+ 0.3-) 930721 691 (1.7- 2.4-) 931207 887 0.1+ 1.0+ 940115 107 (3.7+ 1.6-) 930822 691 (2.3- 1.4-) 931207 887 0.5- 0.5+ 940115 107 (4.1+ 1.3-) 930822 691 (3.0- 2.1-) 931207 887 0.2- 1.3+ 940116 605 (6.0+ 2.6-) 930822 691 (3.4- 1.5-) 931207 887 0.7- 0.7+ 940116 605 (4.6+ 3.8-) 930822 691 (2.3- 1.1-) 931208 900 0.5- 1.2+ 940118 107 (4.3+ 1.5-) 930824 360 1.8- 2.0- 931208 900 1.6- 1.7+ 940118 107 (3.6+ 0.2+) 930824 360 1.7- 1.8- 931208 411 0.0 0.3+ 940129 595 1.8+ 1.7- 930827 360 1.1- 1.7- 931208 411 0.1+ 1.1+ 940129 595 1.2+ 0.8- 930827 360 1.1- 1.6- 931208 411 0.3- 0.5+ 940130 897 (3.1+ 0.8-) 930926 411 (2.7- 0.1-) 931209 411 0.3- 1.5+ 940130 897 2.1+ 1.1- 930926 411 (2.7- 1.4-) 931209 411 0.4- 0.5+ 940201 657 2.0+ 1.0- 930926 411 (2.8- 1.0-) 931209 411 0.2- 1.2+ 940201 657 1.6+ 1.2- 930926 360 1.6- 0.8- 931211 411 0.1+ 0.4+ 940201 657 2.0+ 0.6- 930926 360 1.8- 0.7- 931211 411 0.5+ 0.5+ 940203 360 0.9+ 0.9- 931011 900 (5.5- 3.8+) 931211 411 0.1+ 0.5+ 940203 360 0.8+ 1.0- 931011 900 (6.0- 0.0 ) 931211 897 1.1- 0.2- 940215 801 (1.8+ 3.6-) 931011 360 1.7- 0.0 931211 897 0.8- 0.5+ 940215 801 (1.7+ 2.7-) 931011 360 2.0- 0.2- 931211 887 0.6- 1.3+ 940215 046 2.2+ 2.0- 931012 801 2.1- 0.9+ 931211 887 1.1+ 0.3- 940215 046 (0.0 3.9-) 931012 801 (2.4- 1.3+) 931211 887 0.8- 1.2+ 940215 046 (0.5+ 4.0-) 931014 801 2.1- 0.8- 931211 107 0.2+ 0.7+ 940217 897 (3.7+ 1.3-) 931014 801 0.5- 0.7- 931211 107 0.3- 1.3+ 940217 897 (2.3+ 0.7-) 931015 107 (5.6- 1.2-) 931212 411 0.3- 0.2- 940302 360 0.2+ 1.3- 931016 107 (3.4- 0.6-) 931212 411 0.2- 0.1+ 940302 360 0.3+ 1.4- 931022 691 2.0- 0.0 931212 411 0.2- 0.2- 940306 897 (4.5+ 2.2-) 931022 691 1.1- 0.4+ 931212 360 0.2- 0.3+ 940306 897 1.0+ 2.2- 931022 360 1.3- 0.2+ 931212 360 0.2- 0.2+ 940306 897 (4.3+ 3.4-) 931022 360 1.0- 0.2+ 931212 900 0.9- 0.6+ 940330 360 0.9+ 1.5- 931023 107 (2.3- 2.6+) 931212 900 1.5- 0.6+ 940330 360 0.2- 1.2- 931023 107 1.7- 1.6- 931212 107 0.3- 0.8+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1997 May 3