OAA computing section circular NK 639 84P/Giclas
The following improved orbital elements, by S. Nakano, are from 164 observations 1931 to 1993, including planetary perturbations by Mercury to Pluto and five minor planets, Ceres, Pallas, Vesta, Iris, Bamberga and non-gravitational effect of style II. The mean residual is +/- 0.92 arc second. Epoch = 1992 Sept.15.0 TT (Not found a file of Mean error) T = 1992 Sept.13.09278 Peri. = 276.48559 Node = 112.52637 Inc. = 7.28346 q = 1.8467987 e = 0.4932109 a = 3.6441165 n' = 0.14168233 P = 6.956 A1 = +0.018 A2 = +0.00419 T = 1931 Nov. 18.98801 TT Epoch = 1931 Dec. 5.0 TT Peri. = 241.10518 e = 0.5304286 Node = 147.43109 (2000.0) a = 3.4651860 AU Inc. = 9.06150 n'= 0.15279680 q = 1.6271522 AU P = 6.450 years [ T = 1938 July 13.26386 TT Epoch = 1938 July 1.0 TT Peri. = 246.74513 e = 0.5076872 Node = 142.78423 (2000.0) a = 3.5606015 AU Inc. = 8.53710 n'= 0.14669625 q = 1.7529298 AU P = 6.719 years ] [ T = 1945 Apr. 7.81591 TT Epoch = 1945 Apr. 15.0 TT Peri. = 246.90648 e = 0.5062545 Node = 142.69799 (2000.0) a = 3.5683481 AU Inc. = 8.52918 n'= 0.14621882 q = 1.7618559 AU P = 6.741 years ] [ T = 1951 Dec. 31.69397 TT Epoch = 1951 Dec. 20.0 TT Peri. = 246.78214 e = 0.5063635 Node = 142.68416 (2000.0) a = 3.5709644 AU Inc. = 8.52390 n'= 0.14605815 q = 1.7627582 AU P = 6.748 years ] [ T = 1958 Sept.30.53027 TT Epoch = 1958 Oct. 4.0 TT Peri. = 246.81217 e = 0.5046455 Node = 142.61398 (2000.0) a = 3.5759373 AU Inc. = 8.51662 n'= 0.14575358 q = 1.7713567 AU P = 6.762 years ] [ T = 1965 June 30.61304 TT Epoch = 1965 July 19.0 TT Peri. = 246.83816 e = 0.5063969 Node = 142.59608 (2000.0) a = 3.5670434 AU Inc. = 8.52334 n'= 0.14629904 q = 1.7607035 AU P = 6.737 years ] [ T = 1972 Mar. 14.66313 TT Epoch = 1972 Mar. 24.0 TT Peri. = 247.05780 e = 0.5109561 Node = 142.30629 (2000.0) a = 3.5480513 AU Inc. = 8.53755 n'= 0.14747528 q = 1.7351527 AU P = 6.683 years ] T = 1978 Nov. 21.15997 TT Epoch = 1978 Nov. 28.0 TT Peri. = 247.20958 e = 0.5114568 Node = 142.22100 (2000.0) a = 3.5448304 AU Inc. = 8.53933 n'= 0.14767633 q = 1.7318028 AU P = 6.674 years T = 1985 Oct. 1.23471 TT Epoch = 1985 Sept.12.0 TT Peri. = 276.36176 e = 0.4945615 Node = 112.59730 (2000.0) a = 3.6359585 AU Inc. = 7.28752 n'= 0.14215944 q = 1.8377535 AU P = 6.933 years The predicted orbit for the 1999 return is as follows: T = 1999 Aug. 25.13670 TT Epoch = 1999 Aug. 10.0 TT Peri. = 276.41913 e = 0.4936402 Node = 112.48876 (2000.0) a = 3.6453036 AU Inc. = 7.28172 n'= 0.14161313 q = 1.8458351 AU P = 6.960 years [ Residual block was lost].
Director, Computing Section Syuichi Nakano 1996 Apr. 15