OAA computing section circular NK 667B 73P/Schwassmann-Wachmann 3 = Nucleus B in 1995/1996
The following improved orbital elements, by S. Nakano, are from 155 observations 1989-1996, excepting 1979 appearance. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 1.32 arc seconds. Epoch = 1995 Oct. 10.0 TT T = 1995 Sept.22.88816 +/- 0.00010 (m.e.) TT Peri. = 198.76774 +/- 0.00029 Node = 69.94563 +/- 0.00024 (2000.0) Inc. = 11.42355 +/- 0.00003 q = 0.9327922 +/- 0.0000012 AU e = 0.6948502 +/- 0.0000010 a = 3.0568338 +/- 0.0000037 AU n' = 0.18441504 +/- 0.00000033 P = 5.345 +/- 0.0000096 years A1 = +1.372 +/- 0.024 A2 = +0.37421 +/- 0.00673 [ T = 1979 Sept. 4.58135 TT Epoch = 1979 Sept. 4.0 TT Peri. = 198.78397 e = 0.6927510 Node = 69.95215 (2000.0) a = 3.0616273 AU Inc. = 11.40971 n'= 0.18398211 q = 0.9406819 AU P = 5.357 years ] T = 1985 Jan. 12.01986 TT Epoch = 1985 Jan. 15.0 TT Peri. = 198.80296 e = 0.6938542 Node = 69.94465 (2000.0) a = 3.0587065 AU Inc. = 11.42045 n'= 0.18424570 q = 0.9364102 AU P = 5.349 years T = 1990 May 19.30157 TT Epoch = 1990 May 29.0 TT Peri. = 198.80810 e = 0.6939740 Node = 69.93486 (2000.0) a = 3.0594824 AU Inc. = 11.41242 n'= 0.18417562 q = 0.9362811 AU P = 5.351 years The predicted orbit for the 2001 return is as follows: T = 2001 Jan. 28.07280 TT Epoch = 2001 Jan. 11.0 TT Peri. = 198.77406 e = 0.6938431 Node = 69.91941 (2000.0) a = 3.0618613 AU Inc. = 11.40572 n'= 0.18396101 q = 0.9374099 AU P = 5.358 years The following residuals in seconds of arc are from the above orbital elements: 1989/ 950426 360 2.1+ 0.8- 951124 897 (3.6+ 0.2-) 891205 568 (7.2- 2.4-)Y 950426 360 1.7+ 1.1- 951124 897 (3.3+ 1.0-) 891205 568 (6.2- 2.0-)Y 950505 118 1.6+ 0.1- 951125 410(10.9+ 1.3+) 891205 568 (6.7- 1.7-)Y 950505 118 0.3+ 0.1- 951125 410(10.6+ 0.7+) 891205 568 (6.7- 2.5-)Y 950507 118 0.4+ 0.1+ 951125 410(10.5+ 0.5+) 891205 568 (5.8- 2.6-)Y 950507 118 0.3- 0.1+ 951127 897 (6.1+ 0.8-) 891209 675 1.8- 0.9- 950518 360 1.6+ 0.0 951127 897 (4.3+ 0.5-) 891209 675 1.2- 1.1- 950518 360 1.6+ 0.1- 951127 897 (3.6+ 0.6-) 891209 675 0.9- 1.3- 950518 360 1.5+ 0.2- 951208 897 (6.4+ 0.1+) 891209 675 1.6- 1.1- 950523 360 0.9+ 0.5+ 951208 897 (5.0+ 0.3-) 891212 675 1.5- 0.9- 950523 360 0.6+ 0.8+ 951208 413 (4.4+ 0.1+) 891212 675 1.4- 0.8- 950523 360 0.6+ 0.8+ 951208 413 (4.5+ 0.1+) 891212 675 2.2- 1.8- 950525 693 0.1- 0.2+ 951209 356 (6.9+ 2.0+) 891212 675 1.7- 1.5- 950525 693 1.2+ 1.2+ 951209 356 (5.9+ 1.1+) 1990/ 950525 693 1.6+ 1.4+ 951209 356 (6.7+ 0.0 ) 900223 657 (6.3- 2.9+) 950529 118 0.6+ 0.7- 951209 356 (6.9+ 1.2+) 900223 657 (5.7- 1.1+) 950615 118 0.8- 0.9+ 951210 360 (4.4+ 0.2+) 900223 657 (4.9- 1.2+) 950617 118 0.7+ 1.4+ 951210 360 (4.6+ 0.3+) 900226 801 (4.8- 1.8-) 950620 360 0.5+ 0.4+ 951211 897 (4.0+ 0.2-) 900226 801 (5.0- 2.7-) 950620 360 0.2+ 0.4+ 951211 897 (5.7+ 1.9-) 900226 657 (6.6- 0.0 ) 950620 360 1.1+ 0.6+ 951218 897 (4.4+ 0.7+) 900227 801 (3.7- 2.2-) 950628 118 0.2- 1.4+ 951218 897 (3.2+ 0.1-) 900301 413 2.5- 1.3- 950629 118 0.1- 0.5+ 951222 897 (7.3+ 0.7-) 900301 413 (9.1- 0.0 ) 950630 118 1.0+ 0.9+ 951222 897 (6.9+ 0.0 ) 900304 413 (5.6- 1.2-) 950701 118 0.1+ 0.9+ 951223 568 2.1+ 0.4+ 900304 413 (5.5- 1.5-) 951006 897 1.8+ 2.9- Y 951223 568 2.2+ 0.1- 900307 413 0.2- 2.4- 951007 422 2.3- 1.1+ 951224 568 0.5+ 0.3- 900307 413 (4.1- 1.6-) 951007 422 2.5- 0.9+ 951224 568 0.9+ 1.3+ 900320 897 1.2- 1.9- 951009 422 2.1- 1.3+ 951225 568 0.7+ 0.2- 900320 897 1.2- 2.4- 951009 422 1.8- 1.8+ 951225 568 0.5+ 0.3- 900322 801 (3.6- 1.7-) 951009 415 (3.2- 0.5-) 951227 691 0.4- 1.6- 900322 801 1.6- 2.5- 951009 415 2.0- 1.0- 951227 691 0.3+ 1.3- 900322 801 (1.1- 3.6-) 951009 415 2.5- 0.2+ 1996/ 900324 801 1.0- 2.6- 951012 422 2.3- 0.1+ 960111 360 (3.9+ 0.4-) 900326 801 0.6+ 2.6- 951012 422 2.5- 0.1- 960111 360 (3.9+ 0.5-) 900326 801 1.5- 1.8- 951012 372 0.1+ 0.0 960111 360 (3.2+ 0.6-) 900326 323 1.2- 2.7- 951013 372 (4.9- 1.6+) 960113 118 2.4+ 1.5- 900327 657 (0.5+ 4.2-) 951013 372 2.3- 0.8+ 960114 118 2.4+ 2.6- 900327 657 (0.9- 3.8-) 951013 367 1.0- 0.5+ 960119 691 1.3+ 1.6- 900329 801 0.5- 2.1- 951013 367 1.0- 0.3+ 960119 691 1.1+ 1.5- 900329 801 0.6- 2.0- 951013 367 1.5- 0.2- 960119 691 1.0+ 1.5- 900423 801 (4.6+ 1.2-) 951013 367 0.5- 0.0 960121 691 (3.5+ 1.0+) 900425 675(10.4+ 1.8-) 951014 897 0.4+ 2.5+ 960121 691 2.4+ 0.2+ 900426 675 1.8+ 0.5- 951014 897 1.0+ 1.1+ 960121 691 2.7+ 1.0+ 900521 372 1.2- 1.9+ 951014 422 0.9- 0.8+ 960121 691 2.1+ 0.7+ 900620 323 0.8+ 1.3+ 951014 422 0.6- 0.4+ 960126 413 2.9+ 1.1- 900916 801 0.5- 1.5- 951014 422 0.7- 0.5+ 960126 413 2.6+ 0.1+ 900916 801 0.7- 1.7- 951016 422 0.3+ 0.2- 960127 413 2.2+ 0.9- 900918 801 0.7- 1.1- 951016 422 0.4+ 0.0 960127 413 1.7+ 1.0- 900918 801 0.8- 1.4- 951019 323 0.5- 0.1- 960206 118 1.9+ 2.3- 901017 801 0.7+ 0.3- 951023 897 0.6+ 1.0- 960206 118 2.3+ 2.9- 901017 801 0.2- 0.5- 951023 897 0.3- 1.4- 960206 118 (1.2+ 3.7-) 901021 801 0.8- 1.2- 951027 897 0.3+ 1.8- 960209 711 1.5+ 1.2- 901021 801 0.6+ 1.3- 951027 897 0.3- 1.3- 960209 711 1.7+ 1.0- 1994/ 951027 422 0.1+ 0.2- 960210 711 1.8+ 1.1- 941228 493 1.5- 0.1+ 951027 422 0.3+ 0.3- 960210 711 0.8+ 1.9- 941228 493 1.3- 0.4+ 951028 693 1.2- 0.9- 960215 693 (3.5+ 0.1-) 941228 493 1.2- 0.1- 951028 693 2.0- 0.4- 960215 693 2.2+ 1.2- 941229 493 2.1- 0.7+ 951028 693 2.0- 0.4- 960215 693 1.5+ 1.4- 941229 493 1.5- 0.0 951029 413 0.6- 0.2- 960216 693 2.4+ 0.2- 941229 493 1.5- 0.2- 951029 413 0.6- 0.2- 960216 693 (3.4+ 0.3+) 941229 493 1.5- 0.4- 951030 897 0.8- 0.8- 960910 809 0.5- 1.5- 1995/ 951030 897 0.4- 0.8- 960913 809 0.0 1.3- 950128 691 1.0- 1.3+ 951103 323 1.1+ 1.1- 960914 809 0.0 1.7- 950128 691 1.1- 1.3+ 951105 897 2.5+ 1.2- 960914 809 0.0 1.7- 950128 691 1.8- 1.3+ 951105 897 2.9+ 1.1- 960915 809 0.3- 1.5- 950403 360 1.1+ 0.1- 951108 415 (3.8+ 2.6-) 960915 809 0.1- 1.6- 950403 360 0.9+ 0.5- 951112 415 (3.0+ 2.9-) 961118 696 (1.5+ 3.0-) 950403 360 0.9+ 0.3+ 951113 897 1.4+ 0.9- 961118 696 1.2- 2.4- 950420 360 0.1+ 0.9- 951113 897 1.6+ 0.5- 961119 696 0.0 2.0- 950420 360 0.2+ 0.9- 951116 360 2.3+ 0.5- 961214 691 2.1- 1.9- 950420 360 0.1- 1.1- 951116 360 2.5+ 0.6- 961214 691 0.5- 1.7- 950426 360 2.0+ 0.2+ 951118 900 (4.2+ 0.9-) 961214 691 0.9- 0.4- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1998 May 2