OAA computing section circular NK 605 46P/Wirtanen
The following improved orbital elements, by S. Nakano, are from 17 observations 1975 to 1991, including planetary perturbations by Mercury to Pluto and five minor planets and non-gravitational effect of style II. The mean residual is +/- 1.72 arc seconds. Epoch = 1991 Sept.21.0 TT T = 1991 Sept.20.62341 +/- 0.00100 (m.e.) TT Peri. = 356.17331 +/- 0.00167 Node = 82.28590 +/- 0.00119 (2000.0) Inc. = 11.68245 +/- 0.00016 q = 1.0832679 +/- 0.0000065 AU e = 0.6522405 +/- 0.0000012 a = 3.1149918 +/- 0.0000022 AU n' = 0.17927458 +/- 0.00000019 P = 5.498 +/- 0.0000060 years A1 = +1.099 +/- 0.145 A2 = -0.15173 +/- 0.00162 T = 1974 July 5.69363 TT Epoch = 1974 July 12.0 TT Peri. = 351.85922 e = 0.6142641 Node = 84.21330 (2000.0) a = 3.2552121 AU Inc. = 12.26609 n'= 0.16781668 q = 1.2556522 AU P = 5.873 years T = 1980 May 22.61142 TT Epoch = 1980 June 10.0 TT Peri. = 351.96169 e = 0.6142302 Node = 84.16592 (2000.0) a = 3.2547999 AU Inc. = 12.26737 n'= 0.16784857 q = 1.2556035 AU P = 5.872 years T = 1986 Mar. 19.13393 TT Epoch = 1986 Mar. 31.0 TT Peri. = 356.07233 e = 0.6520079 Node = 82.32921 (2000.0) a = 3.1167452 AU Inc. = 11.67965 n'= 0.17912332 q = 1.0846027 AU P = 5.502 years The predicted orbit for the 1997 return (MPC 23482) is as follows: T = 1997 Mar. 14.17400 TT Epoch = 1997 Mar. 13.0 TT Peri. = 356.34322 e = 0.6567441 Node = 82.19830 (2000.0) a = 3.0989130 AU Inc. = 11.72300 n'= 0.18067165 q = 1.0637203 AU P = 5.455 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 741220 691 (0.2- 5.7+) 860401 984 3.3- 1.5+ 910905 657 1.8- 1.6- 750206 691 1.2+ 1.1+ 910708 372 (4.8+ 7.5+) 910905 657 1.8- 1.7- 750206 691 1.3+ 2.6+ 910708 372 1.5+ 2.5+ 911109 900 (3.2+ 1.7+) 851113 474 2.4- 1.3+ 910708 372 2.9+ 2.2+ 911109 900(11.1- 2.0-) 851113 474 0.3- 3.0+ 910708 372 0.4- 1.4- 911110 411 0.4+ 0.6- 851209 474 0.8- 1.5+ 910709 372 0.0 0.5- 911110 411 (5.4- 2.4-) 851209 474 (5.1- 3.6+) 910709 372 (3.4+ 1.1+) 911206 411 0.8- 1.0- 851210 474 (8.5- 0.0 ) 910816 657 0.5+ 2.3- 860331 984 1.9+ 3.0+ 910816 657 0.2+ 0.4- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1994 Apr. 21