OAA computing section circular NK NK742B 73P/Schwassmann-Wachmann 3 (Component B)
The following improved orbital elements, by S. Nakano, are from 152 observations 1989-2000, using Component B observations 1995 Dec. 23 - 1996 Feb. 16 and 2000, 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 +/- 0.93 arc second. Epoch = 2001 Jan. 11.0 TT T = 2001 Jan. 27.98606 +/- 0.00023 (m.e.) TT Peri. = 198.77439 +/- 0.00023 Node = 69.92042 +/- 0.00019 (2000.0) Inc. = 11.40637 +/- 0.00004 q = 0.9374036 +/- 0.0000004 AU e = 0.6938379 +/- 0.0000005 a = 3.0617884 +/- 0.0000018 AU n' = 0.18396759 +/- 0.00000016 P = 5.358 +/- 0.0000048 years A1 = +1.202 +/- 0.018 A2 = +0.32631 +/- 0.00012 A3 = -0.20686 +/- 0.01241 T = 1990 May 19.30131 TT Epoch = 1990 May 29.0 TT Peri. = 198.80825 e = 0.6939829 Node = 69.93458 (2000.0) a = 3.0595756 AU Inc. = 11.41235 n'= 0.18416720 q = 0.9362826 AU P = 5.352 years T = 1995 Sept.22.88903 TT Epoch = 1995 Oct. 10.0 TT Peri. = 198.76800 e = 0.6948503 Node = 69.94621 (2000.0) a = 3.0568268 AU Inc. = 11.42395 n'= 0.18441567 q = 0.9327899 AU P = 5.344 years The predicted orbit for the 2006 return is as follows. The comet will pass 0.064 AU near the Earth on 2006 May 14: T = 2006 June 8.18356 TT Epoch = 2006 May 25.0 TT Peri. = 198.80451 e = 0.6933054 Node = 69.89208 (2000.0) a = 3.0623072 AU Inc. = 11.39858 n'= 0.18392084 q = 0.9391931 AU P = 5.359 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1989/ 950128 691 1.4- 2.1+ 951028 693 0.9- 0.4+ 891205 568 (5.8- 1.2-)Y 950403 360 1.2+ 0.3+ 951028 693 1.0- 0.4+ 891205 568 (4.8- 0.8-)Y 950403 360 1.0+ 0.1- 951029 413 0.4+ 0.7+ 891205 568 (5.3- 0.6-)Y 950403 360 0.9+ 0.8+ 951029 413 0.5+ 0.6+ 891205 568 (5.3- 1.3-)Y 950420 360 0.1+ 0.6- 951030 897 0.2+ 0.1+ 891205 568 (4.3- 1.5-)Y 950420 360 0.2+ 0.6- 951030 897 0.6+ 0.1+ 891209 675 0.3- 0.3+ 950420 360 0.1- 0.8- 951223 568 0.7+ 1.6+ 891209 675 0.3+ 0.1+ 950426 360 2.0+ 0.4+ 951223 568 0.9+ 1.1+ 891209 675 0.5+ 0.1- 950426 360 2.1+ 0.5- 951224 568 0.9- 0.9+ 891209 675 0.2- 0.1+ 950426 360 1.7+ 0.9- 951224 568 (0.4- 2.5+) 891212 675 0.0 0.3+ 950505 118 1.5+ 0.1+ 951225 568 0.7- 1.0+ 891212 675 0.1+ 0.4+ 950505 118 0.3+ 0.1+ 951225 568 0.9- 1.0+ 891212 675 0.7- 0.7- 950507 118 0.3+ 0.2+ 951227 691 1.8- 0.4- 891212 675 0.2- 0.3- 950507 118 0.4- 0.2+ 951227 691 1.2- 0.1- 1990/ 950518 360 1.6+ 0.0 1996/ 900223 657 (4.7- 4.7+) 950518 360 1.5+ 0.0 960111 360 2.0+ 0.5+ 900223 657 (4.0- 2.9+) 950518 360 1.5+ 0.1- 960111 360 2.1+ 0.4+ 900223 657 (3.2- 3.0+) 950523 360 0.8+ 0.5+ 960111 360 1.3+ 0.4+ 900226 801 (3.2- 0.0 ) 950523 360 0.6+ 0.8+ 960113 118 0.5+ 0.6- 900226 801 (3.4- 0.9-) 950523 360 0.5+ 0.8+ 960114 118 0.5+ 1.7- 900226 657 (5.0- 1.8+) 950525 693 0.1- 0.2+ 960119 691 0.8- 0.8- 900227 801 2.1- 0.4- 950525 693 1.1+ 1.2+ 960119 691 0.9- 0.7- 900301 413 0.9- 0.6+ 950525 693 1.6+ 1.4+ 960119 691 1.0- 0.7- 900301 413 (7.6- 1.9+) 950529 118 0.6+ 0.8- 960121 691 1.4+ 1.7+ 900304 413 (4.1- 0.7+) 950615 118 0.8- 0.7+ 960121 691 0.3+ 1.0+ 900304 413 (4.0- 0.4+) 950617 118 0.7+ 1.2+ 960121 691 0.6+ 1.8+ 900307 413 1.2+ 0.4- 950620 360 0.5+ 0.2+ 960121 691 0.0 1.5+ 900307 413 (2.7- 0.4+) 950620 360 0.2+ 0.2+ 960126 413 0.7+ 0.3- 900320 897 0.3- 0.4+ 950620 360 1.1+ 0.4+ 960126 413 0.4+ 0.8+ 900320 897 0.3- 0.1- 950628 118 0.2- 1.1+ 960127 413 0.0 0.2- 900322 801 (2.7- 0.6+) 950629 118 0.1- 0.2+ 960127 413 0.5- 0.3- 900322 801 0.7- 0.2- 950630 118 1.0+ 0.6+ 960206 118 0.5- 1.7- 900322 801 0.3- 1.3- 950701 118 0.1+ 0.6+ 960206 118 0.1- 2.3- 900324 801 0.3- 0.3- 951006 897 (2.9+ 3.0-)Y 960206 118 (1.2- 3.1-) 900326 801 1.2+ 0.3- 951007 422 1.1- 1.1+ 960209 711 0.9- 0.7- 900326 801 0.9- 0.5+ 951007 422 1.4- 0.9+ 960209 711 0.7- 0.5- 900326 323 0.6- 0.3- 951009 422 0.9- 1.3+ 960210 711 0.6- 0.6- 900327 657 1.0+ 1.8- 951009 422 0.6- 1.8+ 960210 711 1.6- 1.3- 900327 657 0.4- 1.4- 951009 415 2.1- 0.5- 960215 693 1.0+ 0.4+ 900329 801 0.1- 0.3+ 951009 415 0.8- 0.9- 960215 693 0.3- 0.7- 900329 801 0.2- 0.4+ 951009 415 1.3- 0.2+ 960215 693 1.0- 1.0- 900423 801 (3.9+ 0.6+) 951012 422 1.1- 0.2+ 960216 693 0.1- 0.2+ 900425 675 (9.7+ 0.2-) 951012 422 1.3- 0.1+ 960216 693 0.9+ 0.8+ 900426 675 1.2+ 1.1+ 951012 372 1.3+ 0.1+ 960910 809 (7.2- 1.3-) 900521 372 1.0- 2.3+ 951013 372 (3.7- 1.8+) 960913 809 (6.8- 1.2-) 900620 323 1.4+ 1.4+ 951013 372 1.1- 1.0+ 960914 809 (6.8- 1.5-) 900916 801 0.2- 0.2- 951013 367 0.2+ 0.7+ 960914 809 (6.8- 1.5-) 900916 801 0.4- 0.4- 951013 367 0.2+ 0.4+ 960915 809 (7.1- 1.4-) 900918 801 0.5- 0.2+ 951013 367 0.3- 0.1- 960915 809 (6.9- 1.4-) 900918 801 0.6- 0.1- 951013 367 0.6+ 0.2+ 961118 696 (6.6- 3.4-) 901017 801 0.6+ 1.2+ 951014 897 (1.6+ 2.7+) 961118 696 (9.3- 2.8-) 901017 801 0.3- 1.0+ 951014 897 2.2+ 1.3+ 961119 696 (8.1- 2.4-) 901021 801 0.9- 0.3+ 951014 422 0.3+ 1.0+ 961214 691 (9.5- 2.5-) 901021 801 0.5+ 0.2+ 951014 422 0.6+ 0.6+ 961214 691 (7.9- 2.4-) 1994/ 951014 422 0.5+ 0.7+ 961214 691 (8.3- 1.1-) 941228 493 1.1- 0.9+ 951016 422 1.5+ 0.1+ 2000/ 941228 493 0.9- 1.2+ 951016 422 1.6+ 0.2+ 001119 118 0.5- 0.2+ 941228 493 0.8- 0.7+ 951019 323 0.7+ 0.3+ 001119 118 0.1- 0.6+ 941229 493 1.7- 1.5+ 951023 897 1.7+ 0.4- 001119 118 1.2- 0.2+ 941229 493 1.1- 0.8+ 951023 897 0.8+ 0.8- 001128 349 2.1+ 1.6+ 941229 493 1.1- 0.5+ 951027 897 1.3+ 1.0- 001128 349 0.4+ 1.1+ 941229 493 1.1- 0.4+ 951027 897 0.8+ 0.6- 001128 349 0.3+ 1.9+ 1995/ 951027 422 1.1+ 0.5+ 001204 300 (2.9+ 2.5-) 950128 691 0.6- 2.0+ 951027 422 1.3+ 0.5+ 001204 300 1.4+ 0.6- 950128 691 0.7- 2.1+ 951028 693 0.2- 0.1- 001204 300 (1.9+ 3.2-) ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2000 Dec. 9