OAA computing section circular NK 623 Periodic Comet Klemola (68P)

The following improved orbital elements, by S. Nakano, are from 147 observations 1965 to 1988, 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 +/- 1.11 arc seconds. Epoch = 1987 July 24.0 TT (Not found a file of Mean error) T = 1987 July 22.63217 Peri. = 154.54240 Node = 176.48404 Inc. = 10.94985 q = 1.7727753 e = 0.6404533 a = 4.9305836 n' = 0.09002364 P = 10.948 A1 = -0.332 A2 = -0.01107 T = 1965 Aug. 18.35606 TT Epoch = 1965 Aug. 28.0 TT Peri. = 148.03419 e = 0.6422188 Node = 182.69592 (2000.0) a = 4.9287527 AU Inc. = 10.60043 n'= 0.09007381 q = 1.7634153 AU P = 10.942 years T = 1976 Aug. 10.18894 TT Epoch = 1976 Aug. 10.0 TT Peri. = 148.87519 e = 0.6417165 Node = 182.27407 (2000.0) a = 4.9279235 AU Inc. = 10.63381 n'= 0.09009655 q = 1.7655935 AU P = 10.939 years The predicted orbit for the 1998 return is as follows: T = 1998 May 1.65373 TT Epoch = 1998 Apr. 17.0 TT Peri. = 154.54377 e = 0.6413190 Node = 175.54316 (2000.0) a = 4.8915856 AU Inc. = 11.08874 n'= 0.09110235 q = 1.7545190 AU P = 10.819 years [ Residual block was lost].

Director, Computing Section Syuichi Nakano 1995 Apr. 20

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