OAA computing section circular NK 613 48P/Johnson
The following improved orbital elements, by K. Muraoka, are from 79 observations 1949 to 1991, 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 +/- 0.97 arc second. T = 1990 Nov. 18.96131 TT Epoch = 1990 Nov. 5.0 TT Peri. = 208.29932 e = 0.3661480 Node = 117.34924 (2000.0) a = 3.6484266 AU Inc. = 13.66104 n'= 0.14143134 q = 2.3125626 AU P = 6.969 years A1 = +0.639 A2 = -0.01802 T = 1949 Sept.16.51971 TT Epoch = 1949 Sept. 1.0 TT Peri. = 206.15858 e = 0.3774513 Node = 118.86211 (2000.0) a = 3.6110677 AU Inc. = 13.86839 n'= 0.14363181 q = 2.2480656 AU P = 6.862 years T = 1956 July 26.90262 TT Epoch = 1956 July 26.0 TT Peri. = 206.03821 e = 0.3754699 Node = 118.84273 (2000.0) a = 3.6168204 AU Inc. = 13.85369 n'= 0.14328927 q = 2.2588132 AU P = 6.878 years T = 1963 June 9.17886 TT Epoch = 1963 June 20.0 TT Peri. = 206.06702 e = 0.3775002 Node = 118.83147 (2000.0) a = 3.6099951 AU Inc. = 13.86489 n'= 0.14369583 q = 2.2472214 AU P = 6.859 years T = 1970 Mar. 30.04181 TT Epoch = 1970 Apr. 4.0 TT Peri. = 206.02289 e = 0.3854352 Node = 118.53449 (2000.0) a = 3.5797125 AU Inc. = 13.89850 n'= 0.14552307 q = 2.1999653 AU P = 6.773 years T = 1977 Jan. 8.42948 TT Epoch = 1977 Jan. 17.0 TT Peri. = 206.23160 e = 0.3860604 Node = 118.47177 (2000.0) a = 3.5763549 AU Inc. = 13.90315 n'= 0.14572805 q = 2.1956660 AU P = 6.763 years T = 1983 Dec. 3.21683 TT Epoch = 1983 Dec. 12.0 TT Peri. = 208.17581 e = 0.3674923 Node = 117.40029 (2000.0) a = 3.6395185 AU Inc. = 13.67400 n'= 0.14195091 q = 2.3020234 AU P = 6.943 years The predicted orbit for the 1997 return is as follows: T = 1997 Oct. 31.84978 TT Epoch = 1997 Nov. 8.0 TT Peri. = 207.99095 e = 0.3672594 Node = 117.35357 (2000.0) a = 3.6481107 AU Inc. = 13.66434 n'= 0.14144971 q = 2.3083076 AU P = 6.968 years
Director, Computing Section Syuichi Nakano 1996 Apr. 11