OAA computing section circular NK 742E 73P/Schwassmann-Wachmann 3 (Component E)

The following improved orbital elements, by S. Nakano, are from 132 observations 1989-1995 Oct. 30 and Component E observations in 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 +/- 0.94 arc second. Epoch = 2001 Jan. 11.0 TT T = 2001 Jan. 28.45376 +/- 0.00019 (m.e.) TT Peri. = 198.77124 +/- 0.00029 Node = 69.91927 +/- 0.00022 (2000.0) Inc. = 11.40648 +/- 0.00006 q = 0.9374405 +/- 0.0000005 AU e = 0.6938782 +/- 0.0000008 a = 3.0623126 +/- 0.0000027 AU n' = 0.18392035 +/- 0.00000024 P = 5.359 +/- 0.0000071 years A1 = +1.664 +/- 0.025 A2 = +0.58124 +/- 0.00008 A3 = -0.24488 +/- 0.01629 T = 1990 May 19.30166 TT Epoch = 1990 May 29.0 TT Peri. = 198.80917 e = 0.6939493 Node = 69.93318 (2000.0) a = 3.0592234 AU Inc. = 11.41235 n'= 0.18419900 q = 0.9362775 AU P = 5.351 years T = 1995 Sept.22.88725 TT Epoch = 1995 Oct. 10.0 TT Peri. = 198.76622 e = 0.6948627 Node = 69.94497 (2000.0) a = 3.0570015 AU Inc. = 11.42402 n'= 0.18439986 q = 0.9328053 AU P = 5.345 years The predicted orbit for the 2006 return is as follows. The comet will pass 0.050 AU near the Earth on 2006 May 17: T = 2006 June 9.58042 TT Epoch = 2006 May 25.0 TT Peri. = 198.79569 e = 0.6934407 Node = 69.88815 (2000.0) a = 3.0638586 AU Inc. = 11.40169 n'= 0.18378116 q = 0.9392544 AU P = 5.363 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1989/ 1994/ 951012 372 0.9+ 0.3+ 891205 568 (5.5- 1.2-)Y 941228 493 1.4- 0.6+ 951013 372 (4.1- 1.9+) 891205 568 (4.5- 0.8-)Y 941228 493 1.2- 0.9+ 951013 372 1.5- 1.2+ 891205 568 (4.9- 0.5-)Y 941228 493 1.2- 0.4+ 951013 367 0.2- 0.9+ 891205 568 (5.0- 1.3-)Y 941229 493 2.0- 1.2+ 951013 367 0.1- 0.6+ 891205 568 (4.0- 1.4-)Y 941229 493 1.4- 0.5+ 951013 367 0.7- 0.1+ 891209 675 0.1- 0.3+ 941229 493 1.4- 0.2+ 951013 367 0.3+ 0.4+ 891209 675 0.5+ 0.1+ 941229 493 1.4- 0.1+ 951014 897 (1.3+ 2.8+) 891209 675 0.7+ 0.0 1995/ 951014 897 1.9+ 1.4+ 891209 675 0.1+ 0.1+ 950128 691 0.9- 1.8+ 951014 422 0.1- 1.1+ 891212 675 0.1+ 0.4+ 950128 691 1.0- 1.8+ 951014 422 0.3+ 0.7+ 891212 675 0.3+ 0.5+ 950128 691 1.8- 1.8+ 951014 422 0.2+ 0.9+ 891212 675 0.5- 0.6- 950403 360 1.1+ 0.2+ 951016 422 1.2+ 0.2+ 891212 675 0.1- 0.2- 950403 360 0.9+ 0.2- 951016 422 1.4+ 0.3+ 1990/ 950403 360 0.9+ 0.6+ 951019 323 0.6+ 0.3+ 900223 657 (5.2- 4.8+) 950420 360 0.1+ 0.7- 951023 897 1.9+ 0.5- 900223 657 (4.6- 3.1+) 950420 360 0.2+ 0.7- 951023 897 1.0+ 0.9- 900223 657 (3.8- 3.1+) 950420 360 0.1- 0.9- 951027 897 1.9+ 1.2- 900226 801 (3.7- 0.1+) 950426 360 2.0+ 0.4+ 951027 897 1.3+ 0.8- 900226 801 (3.9- 0.8-) 950426 360 2.1+ 0.6- 951027 422 1.7+ 0.3+ 900226 657 (5.6- 1.9+) 950426 360 1.7+ 0.9- 951027 422 1.9+ 0.3+ 900227 801 (2.6- 0.3-) 950505 118 1.6+ 0.1+ 951028 693 0.4+ 0.3- 900301 413 1.4- 0.7+ 950505 118 0.3+ 0.1+ 951028 693 0.3- 0.2+ 900301 413 (8.0- 2.0+) 950507 118 0.4+ 0.2+ 951028 693 0.3- 0.2+ 900304 413 (4.6- 0.8+) 950507 118 0.3- 0.2+ 951029 413 1.1+ 0.4+ 900304 413 (4.5- 0.5+) 950518 360 1.6+ 0.1+ 951029 413 1.2+ 0.4+ 900307 413 0.8+ 0.4- 950518 360 1.6+ 0.0 951030 897 1.1+ 0.1- 900307 413 (3.1- 0.4+) 950518 360 1.5+ 0.0 951030 897 1.4+ 0.1- 900320 897 0.4- 0.3+ 950523 360 0.8+ 0.6+ 2000/ 900320 897 0.4- 0.2- 950523 360 0.6+ 0.9+ 001128 349 1.3+ 0.7- 900322 801 (2.9- 0.5+) 950523 360 0.5+ 0.9+ 001128 349 0.5+ 0.5- 900322 801 0.8- 0.3- 950525 693 0.1- 0.3+ 001128 349 0.3+ 0.8- 900322 801 0.4- 1.4- 950525 693 1.2+ 1.3+ 001128 349 1.6+ 1.4- 900324 801 0.4- 0.4- 950525 693 1.6+ 1.5+ 001128 349 1.3+ 0.5- 900326 801 1.1+ 0.4- 950529 118 0.6+ 0.7- 001128 349 0.2+ 0.8+ 900326 801 0.9- 0.4+ 950615 118 0.8- 0.9+ 001128 349 0.0 1.2- 900326 323 0.6- 0.5- 950617 118 0.7+ 1.4+ 001201 349 1.7- 0.6- 900327 657 1.0+ 2.0- 950620 360 0.4+ 0.4+ 001201 349 0.6- 1.2- 900327 657 0.4- 1.6- 950620 360 0.2+ 0.4+ 001201 349 0.9- 0.1- 900329 801 0.1- 0.1+ 950620 360 1.1+ 0.7+ 001201 349 0.7- 0.2+ 900329 801 0.2- 0.2+ 950628 118 0.3- 1.4+ 001201 300 1.6+ 1.3- 900423 801 (3.1+ 0.8+) 950629 118 0.2- 0.5+ 001201 300 0.3- 0.9- 900425 675 (8.8+ 0.1+) 950630 118 1.0+ 1.0+ 001204 300 0.6- 0.7+ 900426 675 0.2+ 1.4+ 950701 118 0.0 0.9+ 001204 300 1.6- 0.6+ 900521 372 (2.6- 2.9+) 951006 897 (2.3+ 2.6-)Y 001204 300 0.4- 0.9- 900620 323 0.1+ 2.0+ 951007 422 1.7- 1.5+ 001204 300 1.0- 0.6+ 900916 801 0.4- 0.3- 951007 422 2.0- 1.2+ 001204 300 1.2- 1.4+ 900916 801 0.6- 0.5- 951009 422 1.4- 1.6+ 001205 355 0.8- 1.3+ 900918 801 0.6- 0.0 951009 422 1.1- 2.2+ 001205 355 0.1- 0.2+ 900918 801 0.7- 0.2- 951009 415 (2.6- 0.2-) 001205 355 0.1- 0.6+ 901017 801 1.0+ 0.8+ 951009 415 1.4- 0.6- 001208 349 (0.6+ 2.5+) 901017 801 0.2+ 0.6+ 951009 415 1.8- 0.5+ 001208 349 0.6+ 1.1+ 901021 801 0.5- 0.2- 951012 422 1.5- 0.4+ 001208 349 1.4+ 0.4- 901021 801 0.9+ 0.2- 951012 422 1.7- 0.3+ 001208 349 0.6+ 1.6+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2000 Dec. 9

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