OAA computing section circular NK 934B 73P/Schwassmann-Wachmann 3 (Component B)
The following improved orbital elements, by S. Nakano, are from 152 observations 1989 to 2001 using component B observations 1995 Dec. 23-1996 Feb. 16 and 2000 - 2001, 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 +/- 1.11 arc seconds. See a previous orbit in NK 742B. Epoch = 2001 Jan. 11.0 TT T = 2001 Jan. 27.98614 +/- 0.00035 (m.e.) TT Peri. = 198.77742 +/- 0.00031 Node = 69.91831 +/- 0.00030 (2000.0) Inc. = 11.40594 +/- 0.00006 q = 0.9374028 +/- 0.0000009 AU e = 0.6938423 +/- 0.0000003 a = 3.0618297 +/- 0.0000013 AU n' = 0.18396387 +/- 0.00000012 P = 5.358 +/- 0.0000035 years A1 = +1.064 +/- 0.012 A2 = +0.32576 +/- 0.00020 A3 = -0.08104 +/- 0.01243 T = 1990 May 19.30100 TT Epoch = 1990 May 29.0 TT Peri. = 198.80934 e = 0.6939877 Node = 69.93326 (2000.0) a = 3.0596209 AU Inc. = 11.41236 n'= 0.18416311 q = 0.9362817 AU P = 5.352 years T = 1995 Sept.22.88954 TT Epoch = 1995 Oct. 10.0 TT Peri. = 198.77038 e = 0.6948547 Node = 69.94436 (2000.0) a = 3.0568690 AU Inc. = 11.42367 n'= 0.18441185 q = 0.9327891 AU P = 5.345 years The predicted orbit for the 2006 return is as follows: Note Comet will pass 0.064 AU near the Earth on 2006 May 14. T = 2006 June 8.18259 TT Epoch = 2006 May 25.0 TT Peri. = 198.80875 e = 0.6933097 Node = 69.88951 (2000.0) a = 3.0623475 AU Inc. = 11.39788 n'= 0.18391721 q = 0.9391924 AU P = 5.359 years Note only A1 and A2 solution from 1994-2001 gives T= 2006 June 7.74 TT. The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1989/ 950426 360 1.4+ 0.9- 960113 118 0.1+ 2.4- 891205 568 (5.1- 2.7-)Y 950505 118 1.2+ 0.2+ 960114 118 (0.2+ 3.6-) 891205 568 (4.1- 2.3-)Y 950505 118 0.0 0.2+ 960119 691 (1.1- 2.7-) 891205 568 (4.6- 2.1-)Y 950507 118 0.0 0.4+ 960119 691 (1.2- 2.6-) 891205 568 (4.6- 2.8-)Y 950507 118 0.7- 0.4+ 960119 691 (1.4- 2.5-) 891205 568 (3.6- 3.0-)Y 950518 360 1.4+ 0.3+ 960121 691 1.1+ 0.2- 891209 675 0.3+ 1.3- 950518 360 1.3+ 0.2+ 960121 691 0.0 0.9- 891209 675 1.0+ 1.4- 950518 360 1.3+ 0.1+ 960121 691 0.3+ 0.1- 891209 675 1.2+ 1.6- 950523 360 0.6+ 0.8+ 960121 691 0.3- 0.4- 891209 675 0.5+ 1.4- 950523 360 0.4+ 1.1+ 960126 413 0.4+ 2.3- 891212 675 0.6+ 1.2- 950523 360 0.3+ 1.1+ 960126 413 0.1+ 1.2- 891212 675 0.8+ 1.1- 950525 693 0.4- 0.6+ 960127 413 0.3- 2.1- 891212 675 0.0 2.2- 950525 693 0.9+ 1.5+ 960127 413 0.9- 2.2- 891212 675 0.4+ 1.8- 950525 693 1.4+ 1.8+ 960206 118 (0.8- 3.7-) 1990/ 950529 118 0.4+ 0.4- 960206 118 (0.4- 4.3-) 900223 657 (4.2- 3.4+) 950615 118 0.9- 1.2+ 960206 118 (1.5- 5.1-) 900223 657 (3.6- 1.6+) 950617 118 0.6+ 1.7+ 960209 711 (1.3- 2.7-) 900223 657 (2.8- 1.7+) 950620 360 0.4+ 0.7+ 960209 711 (1.0- 2.5-) 900226 801 (2.7- 1.3-) 950620 360 0.2+ 0.7+ 960210 711 (1.0- 2.6-) 900226 801 (2.9- 2.2-) 950620 360 1.1+ 0.9+ 960210 711 (1.9- 3.4-) 900226 657 (4.6- 0.5+) 950628 118 0.2- 1.7+ 960215 693 0.7+ 1.7- 900227 801 1.7- 1.6- 950629 118 0.1- 0.8+ 960215 693 (0.7- 2.7-) 900301 413 0.5- 0.6- 950630 118 1.1+ 1.2+ 960215 693 (1.3- 3.0-) 900301 413 (7.2- 0.7+) 950701 118 0.2+ 1.2+ 960216 693 0.4- 1.8- 900304 413 (3.8- 0.4-) 951006 897 (3.4+ 2.9-)Y 960216 693 0.5+ 1.2- 900304 413 (3.6- 0.7-) 951007 422 0.7- 1.2+ 960910 809 (8.7- 4.6-) 900307 413 1.5+ 1.5- 951007 422 0.9- 1.0+ 960913 809 (8.3- 4.6-) 900307 413 2.4- 0.7- 951009 422 0.5- 1.3+ 960914 809 (8.4- 4.9-) 900320 897 0.3- 0.2- 951009 422 0.1- 1.9+ 960914 809 (8.3- 4.9-) 900320 897 0.3- 0.7- 951009 415 1.6- 0.4- 960915 809 (8.6- 4.8-) 900322 801 (2.9- 0.1+) 951009 415 0.4- 0.9- 960915 809 (8.4- 4.9-) 900322 801 0.8- 0.7- 951009 415 0.9- 0.3+ 961118 696 (8.3- 7.6-) 900322 801 0.4- 1.8- 951012 422 0.7- 0.3+ 961118 696(11.0- 7.0-) 900324 801 0.5- 0.7- 951012 422 0.9- 0.1+ 961119 696 (9.8- 6.5-) 900326 801 0.9+ 0.5- 951012 372 1.7+ 0.1+ 961214 691(11.0- 6.5-) 900326 801 1.2- 0.3+ 951013 372 (3.3- 1.8+) 961214 691 (9.4- 6.4-) 900326 323 0.9- 0.5- 951013 372 0.7- 1.0+ 961214 691 (9.9- 5.1-) 900327 657 0.6+ 2.0- 951013 367 0.6+ 0.7+ 2000/ 900327 657 0.7- 1.6- 951013 367 0.6+ 0.5+ 001119 118 1.4- 2.0+ 900329 801 0.6- 0.2+ 951013 367 0.1+ 0.1- 001119 118 (1.0- 2.5+) 900329 801 0.6- 0.3+ 951013 367 1.0+ 0.2+ 001119 118 2.1- 2.1+ 900423 801 2.0+ 2.1+ 951014 897 (2.0+ 2.7+) 001128 349 (1.3+ 3.4+) 900425 675 (7.7+ 1.4+) 951014 897 (2.6+ 1.3+) 001128 349 (0.5- 2.9+) 900426 675 (0.8- 2.7+) 951014 422 0.7+ 1.0+ 001128 349 (0.5- 3.7+) 900521 372 (2.1- 3.6+) 951014 422 1.0+ 0.6+ 001203 349 (2.6+ 1.2+) 900620 323 1.1+ 1.8+ 951014 422 0.9+ 0.7+ 001203 349 2.3- 1.5+ 900916 801 0.7+ 2.0- 951016 422 1.8+ 0.1+ 001203 349 (0.9+ 2.8+) 900916 801 0.5+ 2.2- 951016 422 1.9+ 0.2+ 001204 300 2.0+ 0.7- 900918 801 0.4+ 1.7- 951019 323 1.0+ 0.2+ 001204 300 0.5+ 1.2+ 900918 801 0.4+ 1.9- 951023 897 1.9+ 0.6- 001204 300 1.0+ 1.4- 901017 801 1.6+ 0.9- 951023 897 1.0+ 0.9- 001208 349 0.5+ 0.4+ 901017 801 0.7+ 1.1- 951027 897 1.5+ 1.3- 001208 349 0.2- 2.2+ 901021 801 0.1+ 1.9- 951027 897 0.9+ 0.8- 001220 118 (5.7+ 0.4-) 901021 801 1.4+ 1.9- 951027 422 1.3+ 0.3+ 001220 118 (5.5+ 0.2+) 1994/ 951027 422 1.5+ 0.3+ 001220 118 (5.5+ 0.1-) 941228 493 1.7- 0.1+ 951028 693 0.0 0.4- 001226 349 (7.6+ 0.1-) 941228 493 1.5- 0.4+ 951028 693 0.8- 0.1+ 001226 349 (7.7+ 0.9-) 941228 493 1.4- 0.1- 951028 693 0.8- 0.1+ 001226 349 (8.8+ 0.5-) 941229 493 2.3- 0.7+ 951029 413 0.5+ 0.4+ 001229 349(10.3+ 0.9-) 941229 493 1.7- 0.0 951029 413 0.6+ 0.3+ 001229 349 (8.7+ 0.9-) 941229 493 1.7- 0.3- 951030 897 0.4+ 0.2- 001229 349 (9.1+ 2.2-) 941229 493 1.7- 0.4- 951030 897 0.7+ 0.2- 2001/ 1995/ 951223 568 0.4+ 0.0 010720 309 1.3+ 1.2+ 950128 691 1.2- 1.3+ 951223 568 0.6+ 0.5- 010720 309 1.3+ 1.3+ 950128 691 1.3- 1.4+ 951224 568 1.2- 0.7- 010720 309 1.4+ 1.2+ 950128 691 2.0- 1.4+ 951224 568 0.8- 0.9+ 010720 309 1.1+ 1.1+ 950403 360 0.8+ 0.1+ 951225 568 1.0- 0.6- 010720 309 2.2+ 1.2+ 950403 360 0.6+ 0.3- 951225 568 1.2- 0.6- 010720 309 1.9+ 0.5+ 950403 360 0.5+ 0.6+ 951227 691 2.1- 2.0- 010727 309 1.0+ 1.5+ 950420 360 0.3- 0.7- 951227 691 1.5- 1.7- 010727 309 0.6+ 1.4+ 950420 360 0.2- 0.6- 1996/ 010727 309 1.1+ 1.0+ 950420 360 0.4- 0.8- 960111 360 1.7+ 1.3- 010914 309 1.1- 0.1+ 950426 360 1.6+ 0.4+ 960111 360 1.7+ 1.4- 010914 309 1.2- 0.0 950426 360 1.7+ 0.5- 960111 360 1.0+ 1.5- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2003 Apr. 14