OAA computing section circular NK 1211 Uncertainty Returns in 2008

P/1894 F1 (Denning) from Belyaev orbit. T = 2008 Apr. 2.92235 TT Epoch = 2008 Apr. 4.0 TT Peri. = 105.65641 e = 0.6376755 Node = 22.15197 (2000.0) a = 4.6020286 AU Inc. = 2.99623 n'= 0.09983437 q = 1.6674277 AU P = 9.872 years From 103 observations 1894 Mar. 27-June 5. 51P/Harrington - C from NK 678A orbit. T = 2008 June 23.69575 TT Epoch = 2008 June 23.0 TT Peri. = 268.81982 e = 0.5438249 Node = 84.22816 (2000.0) a = 3.7077057 AU Inc. = 5.43253 n'= 0.13805311 q = 1.6913629 AU P = 7.139 years From 38 observations 1980-1994, mean residual 1".13. Nongravitational parameters A1 = +1.60, A2 = +0.3950. P/1896 R2 (Giacobini) from Belyaev orbit. T = 2008 Sept. 9.89134 TT Epoch = 2008 Sept.11.0 TT Peri. = 154.23223 e = 0.5678942 Node = 179.61248 (2000.0) a = 3.5407086 AU Inc. = 15.31669 n'= 0.14793427 q = 1.5299606 AU P = 6.662 years From 60 observations 1896 Sept.4-1897 Jan. 5. 25D/Neujmin 2 from NK 708 orbit. T = 2008 Oct. 15.03029 TT Epoch = 2008 Oct. 21.0 TT Peri. = 214.88720 e = 0.5862153 Node = 307.79106 (2000.0) a = 3.0747376 AU Inc. = 5.36105 n'= 0.18280665 q = 1.2722795 AU P = 5.392 years From 108 observations 1916-1927, mean residual 2".09.

Director, Computing Section Syuichi Nakano 2005 July 26

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