OAA computing section circular NK 652 64P/Swift-Gehrels
The following improved orbital elements, by S. Nakano, are from 64 observations 1889-1991, 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 +/- 1.52 arc seconds. Epoch = 1991 Mar. 5.0 TT T = 1991 Feb. 22.72381 +/- 0.00040 (m.e.) TT Peri. = 84.81472 +/- 0.00049 Node = 314.44381 +/- 0.00044 (2000.0) Inc. = 9.25498 +/- 0.00005 q = 1.3551331 +/- 0.0000013 AU e = 0.6916002 +/- 0.0000003 a = 4.3940798 +/- 0.0000014 AU n' = 0.10700453 +/- 0.00000005 P = 9.211 +/- 0.0000042 years A1 = +0.571 +/- 0.015 A2 = +0.02194 +/- 0.00005 A3 = +0.07227 +/- 0.01216 T = 1889 Nov. 30.11026 TT Epoch = 1889 Nov. 14.0 TT Peri. = 69.81210 e = 0.6896568 Node = 331.87480 (2000.0) a = 4.3748858 AU Inc. = 10.30464 n'= 0.10770949 q = 1.3577160 AU P = 9.151 years [ T = 1899 Feb. 1.94939 TT Epoch = 1899 Jan. 26.0 TT Peri. = 70.31467 e = 0.6900521 Node = 331.34585 (2000.0) a = 4.3839396 AU Inc. = 10.26690 n'= 0.10737600 q = 1.3587930 AU P = 9.179 years ] [ T = 1908 Mar. 30.38038 TT Epoch = 1908 Apr. 9.0 TT Peri. = 70.42047 e = 0.6912255 Node = 331.21104 (2000.0) a = 4.3668913 AU Inc. = 10.27448 n'= 0.10800541 q = 1.3483845 AU P = 9.126 years ] [ T = 1917 May 9.01094 TT Epoch = 1917 May 12.0 TT Peri. = 76.93270 e = 0.6945173 Node = 324.07622 (2000.0) a = 4.3665078 AU Inc. = 8.96495 n'= 0.10801964 q = 1.3338928 AU P = 9.124 years ] [ T = 1926 June 9.68594 TT Epoch = 1926 June 14.0 TT Peri. = 82.04535 e = 0.6914295 Node = 317.70838 (2000.0) a = 4.4003278 AU Inc. = 9.30437 n'= 0.10677671 q = 1.3578115 AU P = 9.231 years ] [ T = 1935 Sept.13.71424 TT Epoch = 1935 Aug. 26.0 TT Peri. = 82.18774 e = 0.6902664 Node = 317.57294 (2000.0) a = 4.4190546 AU Inc. = 9.28944 n'= 0.10609869 q = 1.3687297 AU P = 9.290 years ] [ T = 1944 Dec. 24.85432 TT Epoch = 1944 Dec. 16.0 TT Peri. = 82.35528 e = 0.6907046 Node = 317.33260 (2000.0) a = 4.4124003 AU Inc. = 9.29043 n'= 0.10633879 q = 1.3647350 AU P = 9.269 years ] [ T = 1954 Apr. 3.48977 TT Epoch = 1954 Apr. 8.0 TT Peri. = 82.85781 e = 0.6910205 Node = 317.05180 (2000.0) a = 4.4064879 AU Inc. = 9.26410 n'= 0.10655288 q = 1.3615144 AU P = 9.250 years ] [ T = 1963 May 31.41480 TT Epoch = 1963 June 20.0 TT Peri. = 83.52951 e = 0.6915677 Node = 315.47487 (2000.0) a = 4.4027124 AU Inc. = 9.22177 n'= 0.10668997 q = 1.3579388 AU P = 9.238 years ] T = 1972 Aug. 31.04276 TT Epoch = 1972 Aug. 31.0 TT Peri. = 84.38084 e = 0.6920882 Node = 314.95519 (2000.0) a = 4.3981350 AU Inc. = 9.26016 n'= 0.10685657 q = 1.3542375 AU P = 9.224 years T = 1981 Nov. 27.45188 TT Epoch = 1981 Nov. 12.0 TT Peri. = 84.50632 e = 0.6913147 Node = 314.75624 (2000.0) a = 4.4091545 AU Inc. = 9.24907 n'= 0.10645623 q = 1.3610411 AU P = 9.258 years The predicted orbit for the 2000 return is as follows: T = 2000 Apr. 21.82932 TT Epoch = 2000 Apr. 6.0 TT Peri. = 92.40845 e = 0.6946035 Node = 306.14185 (2000.0) a = 4.3841066 AU Inc. = 8.43737 n'= 0.10736987 q = 1.3388909 AU P = 9.180 years The following residuals in seconds of arc are from the above orbital elements: 18/ 19/ 19/ 891119 020 (7.6- 1.4+) 730326 691 0.2+ 0.9- 811126 552 (1.4+ 2.9-) 891120 546 (5.2- 2.7-) 730326 691 0.6+ 0.8- 811126 552 0.8- 0.1- 891120 020 0.1+ 0.5+ 810711 801 (1.1- 5.9+) 811126 491 0.9- 0.0 891122 662 (4.3- 4.0-) 810731 801 2.0+ 2.0+ 811127 489 1.8- 0.6+ 891122 020 3.4- 1.2- 810801 801 1.2+ 0.2+ 811127 489 2.1- 0.6+ 891122 526 0.8+ 3.3+ 810802 801 0.4+ 0.7- 811128 494 0.7- 0.5- 891122 040 1.5+ 0.1+ 810805 372 (0.2+ 5.6+) 811128 494 1.1- 1.5- 891122 546 0.1+ 1.4+ 810824 046 1.1+ 1.7+ 811201 020 (4.5+ 3.1+) 891123 662 3.8- 3.7- 810824 046 0.6+ 1.7+ 811217 489 1.0+ 1.0+ 891123 040 2.0+ 1.4- 810826 801 1.8+ 0.3- 811217 489 0.6+ 0.8+ 891126 020 0.5- 2.1+ 810828 046 (1.8+ 2.7-) 811219 801 (6.1- 0.7+) 891127 662 3.2+ 3.8- 810828 046 1.2+ 1.5- 811222 494 (5.7+ 1.3+) 891213 020 (5.8+ 4.7+) 810901 381 (5.9+ 1.6-) 811222 489 (5.2+ 4.4+) 891216 662 (4.9+ 1.8-) 810906 046 1.2+ 1.9+ 811222 489 0.8+ 0.4+ 891221 020 (6.1+ 3.6+) 810906 046 0.8- 0.7- 811222 494 1.8+ 0.9- 891223 795 0.6+ 2.7- 810921 046 0.9- 0.7- 811231 489 1.3+ 0.2- 891224 795 0.3- 1.3+ 810925 801 1.1- 1.0+ 820117 887 2.0+ 0.9- 891224 795 2.2- 0.2+ 810929 491 1.0- 1.6+ 820120 801 2.5+ 0.6+ 891224 795 2.4+ 0.2- 810930 491 2.1+ 1.5- 820125 491 (3.2+ 0.1+) 891224 004 3.2+ 1.3- 811028 491 2.0- 0.9- 820126 491 (5.2+ 2.1+) 900111 662 1.3- 0.5- 811029 020 (0.3- 2.9+) 910107 372 (1.7- 2.8-) 900116 546 1.0+ 3.6+ 811029 491 2.0- 0.9- 910107 372 (6.5- 0.7-) 730208 675 0.5- 1.1- 811102 801 1.4- 0.9- 910112 372 (3.5- 0.1-) 730209 675 1.7- 0.3+ 811105 707 1.9- 0.1- 910113 372 (1.7- 4.7-) 730210 801 2.1- 2.3+ 811115 707 0.0 0.9- 910113 372 (4.9- 2.0-) 730210 801 0.8+ 1.6+ 811115 504(77.4+ 30.3+) 910113 372 1.9- 1.7- 730225 801 0.8+ 0.4- 811115 504(74.5+ 31.8+) 910113 372 2.3- 1.1- 730225 801 1.3- 2.5+ 811123 801 0.8- 2.3+ 910402 372 1.1+ 0.5- 730228 801 (0.9+ 4.5-) 811125 491 1.6+ 1.1+ 910402 372 1.0+ 0.0 730301 801 1.4+ 0.5+ 811126 552 1.1- 0.6- 910402 372 1.2- 1.3- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1997 May 3