OAA computing section circular NK 670 75P/Kohoutek
The following improved orbital elements, by S. Nakano, are from 83 observations 1975-1988, 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 +/- 1.04 arc seconds. Epoch = 1994 June 17.0 TT T = 1994 June 29.69669 +/- 0.00065 (m.e.) TT Peri. = 175.81026 +/- 0.00045 Node = 269.68637 +/- 0.00038 (2000.0) Inc. = 5.90685 +/- 0.00005 q = 1.7845829 +/- 0.0000022 AU e = 0.4962952 +/- 0.0000010 a = 3.5429140 +/- 0.0000023 AU n' = 0.14779617 +/- 0.00000015 P = 6.669 +/- 0.0000065 years A1 = +3.267 +/- 0.042 A2 = +0.67192 +/- 0.00801 T = 1975 Jan. 18.18457 TT Epoch = 1975 Jan. 28.0 TT Peri. = 169.68764 e = 0.5369540 Node = 273.95501 (2000.0) a = 3.3862261 AU Inc. = 5.41881 n'= 0.15817220 q = 1.5679783 AU P = 6.231 years T = 1981 Apr. 17.00989 TT Epoch = 1981 Apr. 26.0 TT Peri. = 169.83014 e = 0.5365564 Node = 273.88739 (2000.0) a = 3.3890058 AU Inc. = 5.41713 n'= 0.15797763 q = 1.5706130 AU P = 6.239 years T = 1987 Oct. 30.05723 TT Epoch = 1987 Oct. 12.0 TT Peri. = 175.68327 e = 0.4978956 Node = 269.74072 (2000.0) a = 3.5357975 AU Inc. = 5.91635 n'= 0.14824259 q = 1.7753396 AU P = 6.649 years The predicted orbit for the 2001 return is as follows: T = 2001 Feb. 26.81259 TT Epoch = 2001 Feb. 20.0 TT Peri. = 175.70625 e = 0.4961303 Node = 269.68280 (2000.0) a = 3.5470473 AU Inc. = 5.90953 n'= 0.14753790 q = 1.7872498 AU P = 6.680 years The following residuals in seconds of arc are from the above orbital elements: 750209 029 0.4+ 1.4+ 860730 691 0.6+ 1.4+ 871218 894 0.1+ 1.4+ 750227 029 1.2+ 0.3+ 860731 691 1.6+ 2.3+ 871218 894 (4.6+ 2.5-) 750227 029 0.3+ 0.5+ 860731 691 0.3- 1.7+ 871219 503 0.4- 0.8+ 750305 801 (0.2- 3.6+) 860731 691 1.9+ 1.0+ 871220 897 0.5+ 1.1- 750306 801 1.6- 0.8+ 860731 691 0.8+ 1.8+ 871220 897 0.5- 0.4- 750307 691 0.0 1.4+ 860925 691 0.9- 0.1+ 871224 801 2.4+ 0.9- 750307 691 0.2- 0.9+ 860925 691 0.4+ 0.2- 871224 657 1.0+ 0.5- 750307 372 (2.1- 3.7+) 860925 691 0.9- 0.7- 871224 894 1.9- 0.8- 750313 693 1.2- 0.6+ 860925 691 0.9- 2.1+ 871226 897 0.9+ 1.4- 750313 693 (0.8+ 7.0-) 860925 691 1.4- 0.2+ 871226 897 0.4+ 1.3- 750316 029 0.2+ 0.0 860925 691 1.3- 0.3- 880111 892 0.0 0.1+ 750316 029 1.2+ 0.8+ 860925 691 0.2- 0.8- 880111 892 (3.9- 1.8-) 750317 029 0.0 0.8+ 860927 691 (2.7- 1.3+) 880120 503 (0.5+ 4.0+) 750319 801 0.0 1.1- 860927 691 1.3- 0.7+ 880121 691 0.5+ 0.1+ 750330 029 0.1- 1.2- 861030 691 1.9- 2.3+ 880121 691 0.1- 0.1+ 750331 029 0.3- 0.6+ 861030 691 1.1- 0.1- 880123 801 0.0 0.1- 750401 801 0.9- 0.2- 861030 691 1.2+ 1.2- 880208 892 (2.7- 3.6-) 750403 372 0.6+ 0.5- 870725 372 (5.2- 1.2+) 880210 897 2.3- 2.1+ 750403 993 (0.9+ 2.6+) 870927 691 (3.9- 0.2-) 880210 897 (3.2- 1.6+) 750429 801 0.8- 0.6- 871016 691 1.8- 0.6- 880213 503 1.3- 1.2+ 750505 691 0.0 0.1- 871016 691 1.8- 0.0 880213 691 1.0- 0.3+ 750505 691 0.4+ 0.1- 871016 691 2.0- 0.3- 880213 691 0.8- 0.1+ 750509 801 0.7- 0.2- 871021 657 (3.5- 0.8+) 880214 503 0.8+ 0.4- 750530 801 1.0+ 0.1- 871021 657 (2.8- 0.1+) 880215 897 0.5- 2.0+ 760429 691 0.3- 0.0 871022 801 0.4- 1.6+ 880215 897 1.8+ 0.4+ 760429 691 0.0 0.1- 871026 691 1.5- 0.2+ 880215 046 0.6- 0.0 800806 809(0.03+ 0.01+) 871026 691 0.8- 0.1- 880215 046 0.4- 0.3- 800807 809(0.03+ 0.01+) 871029 503 (3.9- 0.7-) 880216 503 0.5- 1.6+ 800807 809(0.03+ 0.01+) 871116 691 1.1+ 1.2- 880217 801 1.3- 0.2+ 800810 809(84.7+ 60.2+) 871116 691 1.0+ 1.0- 880219 897 2.4+ 1.7+ 800810 809(0.03+ 0.01+) 871119 801 2.2+ 0.1+ 880219 897 1.2+ 1.9+ 800912 801(0.03+ 0.02+) 871121 897 0.5- 0.7- 880219 894 2.2+ 1.1- 800916 801(0.03+ 0.02+) 871213 657 0.7- 1.0- 880316 801 0.5- 1.2+ 810131 801(0.04+ 0.01+) 871217 897 0.5+ 0.0 880519 568 0.4+ 1.6+ 860730 691 0.8- 1.0+ 871217 897 0.0 0.0 860730 691 0.3- 1.0+ 871218 801 1.4+ 0.2- ( ) -------- Rejected Obs.
Director, Computing Section Computed date Syuichi Nakano 1997 July 10