OAA computing section circular NK 667C 73P/Schwassmann-Wachmann 3 = Nucleus C in 1995/1996
The following improved orbital elements, by S. Nakano, are from 215 observations 1979-1996 excepting 1990 appearance. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II were taken into account. The mean residual is +/- 0.87 arc second. Epoch = 1995 Oct. 10.0 TT T = 1995 Sept.22.89027 +/- 0.00007 (m.e.) TT Peri. = 198.76718 +/- 0.00019 Node = 69.94907 +/- 0.00016 (2000.0) Inc. = 11.42378 +/- 0.00002 q = 0.9327817 +/- 0.0000013 AU e = 0.6948680 +/- 0.0000007 a = 3.0569779 +/- 0.0000028 AU n' = 0.18440200 +/- 0.00000025 P = 5.345 +/- 0.0000073 years A1 = +0.582 +/- 0.031 A2 = +0.14278 +/- 0.00235 T = 1979 Sept. 2.78084 TT Epoch = 1979 Sept. 4.0 TT Peri. = 198.77035 e = 0.6928932 Node = 69.95550 (2000.0) a = 3.0631839 AU Inc. = 11.40993 n'= 0.18384189 q = 0.9407247 AU P = 5.361 years T = 1985 Jan. 11.24062 TT Epoch = 1985 Jan. 15.0 TT Peri. = 198.79351 e = 0.6939580 Node = 69.94806 (2000.0) a = 3.0597987 AU Inc. = 11.42070 n'= 0.18414706 q = 0.9364268 AU P = 5.352 years [ T = 1990 May 19.11994 TT Epoch = 1990 May 29.0 TT Peri. = 198.80311 e = 0.6940341 Node = 69.93830 (2000.0) a = 3.0601095 AU Inc. = 11.41265 n'= 0.18411901 q = 0.9362891 AU P = 5.353 years ] The predicted orbit for the 2001 return is as follows: T = 2001 Jan. 27.83011 TT Epoch = 2001 Jan. 11.0 TT Peri. = 198.77579 e = 0.6938354 Node = 69.92285 (2000.0) a = 3.0616874 AU Inc. = 11.40595 n'= 0.18397669 q = 0.9373803 AU P = 5.357 years The following residuals in seconds of arc are from the above orbital elements: 1979/ 951007 422 1.4- 0.0 951224 422 0.2- 0.1- 790813 323 (3.9+ 0.4-) 951007 422 1.7- 0.2- 951224 422 1.7- 0.7- 790815 323 0.4+ 1.3- 951009 422 1.3- 0.3+ 951225 568 1.3- 0.1- 790815 323 0.6- 0.4- 951009 422 1.0- 0.8+ 951225 568 1.6- 0.0 790818 474 2.5+ 0.7- 951009 415 (2.4- 1.5-) 951227 691 1.0- 0.4- 790819 323 0.5- 1.1- 951009 415 (1.2- 2.0-) 951227 691 0.8- 0.2- 790819 323 0.6- 1.0- 951009 415 1.7- 0.8- 951228 118 0.8- 0.3- 790821 323 0.2- 0.1- 951012 422 1.6- 0.7- 951228 118 0.0 0.5- 790821 323 0.5- 1.0+ 951012 422 1.7- 0.9- 951228 118 0.6+ 0.0 790822 413 1.7+ 0.5+ 951012 372 0.8+ 0.8- 951229 764 (2.1- 1.1-) 790822 323 0.8- 0.2+ 951013 372 (4.2- 0.9+) 951229 118 0.4- 0.5- 790828 323 0.3- 0.5- 951013 372 1.6- 0.1+ 951229 118 0.2+ 0.3- 790831 323 0.1- 0.1+ 951013 367 0.3- 0.2- 951229 118 1.4- 1.5- 790903 323 2.2+ 0.6+ 951013 367 0.3- 0.5- 1996/ 790903 323 1.2- 1.4+ 951013 367 0.8- 1.0- 960102 834 (3.0+ 1.1+) 790904 323 1.3+ 0.9+ 951013 367 0.2+ 0.7- 960104 413 0.1- 0.6- 790904 323 1.5+ 0.4+ 951014 897 1.1+ 1.8+ 960104 413 0.2- 1.2- 790909 415 (3.3+ 3.8+) 951014 897 1.7+ 0.4+ 960109 372 (2.0- 2.9-) 790911 323 0.4- 1.5+ 951014 422 0.3- 0.1+ 960109 413 0.1+ 0.4- 790911 323 0.4+ 2.4+ 951014 422 0.1+ 0.3- 960109 413 0.2- 0.6- 790914 415 1.6+ 2.3+ 951014 422 0.0 0.2- 960109 413 0.3- 0.8- 790914 323 0.4+ 2.5+ 951016 422 0.8+ 0.7- 960109 413 0.2- 0.5- 790916 323 2.7+ 1.9+ 951016 422 1.0+ 0.6- 960110 413 0.9+ 0.1- 790917 323 0.1- 1.0+ 951019 323 0.1- 0.4- 960110 413 1.0+ 0.2- 790917 323 0.1- 1.4+ 951023 897 0.8+ 1.1- 960110 413 0.9+ 0.1- 790918 415 (3.5+ 2.1+) 951023 897 0.2- 1.4- 960111 360 1.1+ 0.4- 790918 323 1.2+ 0.0 951027 897 0.2+ 1.6- 960111 360 1.0+ 0.2- 790918 323 1.2+ 1.3+ 951027 897 0.4- 1.2- 960111 360 1.1+ 0.4- 790925 323 (1.5+ 3.3+) 951027 422 0.1- 0.1- 960112 372 (0.0 2.9-) 790927 323 (3.4+ 3.8+) 951027 422 0.1+ 0.1- 960113 118 1.2+ 0.0 790927 323 0.1+ 1.1+ 951028 693 1.4- 0.7- 960114 118 1.2+ 0.5- 790928 323(10.6+ 0.5-) 951028 693 (2.2- 0.2-) 960115 118 1.6+ 0.1+ 791002 323 (1.8+ 3.5+) 951028 693 (2.2- 0.2-) 960115 118 0.7+ 0.6- 791012 323 (8.7+ 5.4+) 951029 413 0.9- 0.1+ 960116 046 0.1+ 0.7- 791012 323 (0.8+ 3.8+) 951029 413 0.8- 0.0 960116 046 0.4- 0.8- 791015 323 (0.6- 4.0+) 951030 897 1.1- 0.5- 960116 046 0.3+ 0.4- 791017 323 (8.1+ 0.9+) 951030 897 0.8- 0.4- 960117 118 1.1+ 1.4- 791017 323 (7.1+ 0.3+) 951103 323 0.4+ 0.6- 960117 118 0.3+ 1.8- 791024 323 (2.3+ 4.0+) 951105 897 1.6+ 0.6- 960119 691 0.6- 1.0- 791108 323 1.8+ 0.7+ 951105 897 (2.0+ 0.5-) 960119 691 0.5- 1.4- 791114 323 0.2- 1.6+ 951108 415 (2.5+ 1.9-) 960119 691 0.6- 0.7- 1994/ 951112 415 (1.3+ 2.2-) 960121 691 0.8+ 1.0+ 941228 493 0.8- 0.4+ 951113 897 0.4- 0.2- 960121 691 0.9+ 1.2+ 941228 493 0.6- 0.7+ 951113 897 0.2- 0.2+ 960121 691 0.9+ 1.3+ 941228 493 0.5- 0.2+ 951116 360 0.2+ 0.2+ 960121 691 0.9+ 1.2+ 941229 493 1.4- 1.0+ 951116 360 0.3+ 0.1+ 960121 118 1.6+ 0.4+ 941229 493 0.8- 0.3+ 951118 900 1.9+ 0.3- 960121 118 0.8+ 0.2+ 941229 493 0.8- 0.1+ 951124 897 0.6+ 0.3+ 960126 413 0.4- 0.4- 941229 493 0.8- 0.1- 951124 897 0.3+ 0.5- 960126 413 0.3+ 0.2- 1995/ 951125 410 (7.8+ 1.8+) 960127 413 0.2+ 0.2+ 950128 691 0.5- 1.7+ 951125 410 (7.5+ 1.2+) 960127 413 0.3+ 0.0 950128 691 0.6- 1.7+ 951125 410 (7.4+ 1.0+) 960205 118 0.3- 1.2- 950128 691 1.3- 1.7+ 951127 897 (2.8+ 0.4-) 960205 118 0.5- 1.3- 950403 360 0.4+ 0.3- 951127 897 1.0+ 0.1- 960206 118 1.1+ 0.9- 950403 360 0.2+ 0.6- 951127 897 0.3+ 0.2- 960206 118 1.5+ 0.4- 950403 360 0.1+ 0.2+ 951208 897 (2.0+ 0.1+) 960206 118 0.9+ 0.4- 950420 360 0.6- 1.4- 951208 897 0.6+ 0.3- 960209 711 0.4+ 0.1- 950420 360 0.5- 1.4- 951208 413 0.1+ 0.1+ 960209 711 0.2+ 0.4- 950420 360 0.8- 1.6- 951208 413 0.2+ 0.1+ 960210 711 0.1- 1.1- 950426 360 1.3+ 0.4- 951209 356 (2.5+ 1.9+) 960210 711 0.3- 1.1- 950426 360 1.4+ 1.3- 951209 356 1.5+ 1.1+ 960215 693 0.0 0.6- 950426 360 1.1+ 1.7- 951209 356 (2.3+ 0.0 ) 960215 693 0.6+ 0.4- 950505 118 1.0+ 0.8- 951209 356 (2.5+ 1.2+) 960215 693 0.1+ 0.5- 950505 118 0.2- 0.8- 951210 360 0.1- 0.1+ 960216 693 1.1+ 0.8+ 950507 118 0.2- 0.6- 951210 360 0.1+ 0.2+ 960216 693 0.9+ 0.5+ 950507 118 0.9- 0.6- 951211 897 0.6- 0.3- 960219 360 1.1- 1.2- 950518 360 1.2+ 0.9- 951211 897 (1.1+ 2.0-) 960219 360 (1.3- 2.1-) 950518 360 1.1+ 1.0- 951215 422 0.2+ 1.0- 960910 809 0.0 0.5+ 950518 360 1.1+ 1.1- 951215 422 0.3+ 1.1- 960913 809 0.1+ 0.4+ 950523 360 0.5+ 0.4- 951216 422 1.8+ 0.9- 960914 809 0.0 0.2+ 950523 360 0.2+ 0.2- 951216 422 0.6- 0.6- 960914 809 0.4+ 0.4+ 950523 360 0.1+ 0.2- 951216 422 1.7+ 0.4- 960915 809 0.2+ 0.4+ 950525 693 0.5- 0.8- 951218 897 0.6- 0.3+ 960915 809 0.1+ 0.5+ 950525 693 0.8+ 0.2+ 951218 897 1.9- 0.5- 960920 696 0.5- 1.1+ 950525 693 1.2+ 0.4+ 951221 422 0.1+ 0.2- 960920 696 0.6+ 1.3+ 950529 118 0.3+ 1.8- 951221 422 1.2+ 0.4- 960920 696 0.0 0.7+ 950615 118 1.0- 0.5- 951221 422 1.6- 0.4- 960921 696 0.7- 0.3+ 950617 118 0.5+ 0.0 951222 897 (2.0+ 1.4-) 960921 696 0.3- 0.4+ 950620 360 0.3+ 1.1- 951222 897 1.7+ 0.6- 961118 696 0.9- 0.1+ 950620 360 0.1+ 1.1- 951223 693 0.6+ 0.3+ 961118 696 1.7- 0.3+ 950620 360 1.0+ 0.8- 951223 693 0.6+ 0.3+ 961118 696 1.0- 0.2- 950628 118 0.3- 0.2- 951223 693 0.5+ 0.3+ 961119 696 0.5- 1.2+ 950629 118 0.2- 1.1- 951223 568 0.1+ 0.6+ 961214 691 (2.3- 0.5+) 950630 118 1.0+ 0.7- 951223 568 0.2+ 0.1+ 961214 691 0.7- 0.9+ 950701 118 0.1+ 0.7- 951224 568 1.5- 0.1- 961214 691 1.0- 1.1+ 951006 897 (2.6+ 4.1-)Y 951224 568 1.1- 1.6+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1998 May 2