OAA computing section circular NK 507 Periodic Comet Hartley 2 1985 V
The following improved orbital elements, by S. Nakano, are from 15 observations 1986 Mar. 15 to June 7. Perturbations by all nine planets were taken into account. The mean residual is +/- 0.51 arc second: Epoch = 1985 June 24.0 ET T = 1985 June 5.21162 +/- 0.05008 (m.e.) ET Peri. = 174.86773 +/- 0.00985 Node = 226.13283 +/- 0.00903 (1950.0) Inc. = 9.25565 +/- 0.00173 q = 0.9508221 +/- 0.0005117 AU e = 0.7204969 +/- 0.0001262 a = 3.4018302 +/- 0.0009966 AU n_ = 0.15708515 +/- 0.00006903 P = 6.274 +/- 0.0027573 years (+/- 1.01 day) The predicted orbit for the 1991 return is as follows: T = 1991 Sept.17.22034 ET Epoch = 1991 Sept.21.0 ET Peri. = 174.95255 e = 0.7201393 Node = 226.06300 (1950.0) a = 3.4035925 AU Inc. = 9.25460 n_= 0.15696316 q = 0.9525317 AU P = 6.279 years The following residuals in seconds of arc are from the above orbital elements: Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1986 03 15.59361 11 22 52.78 -07 27 45.7 0.4+ 0.7+ 413/SS 1986 03 17.67951 11 20 54.53 -07 11 14.2 1.5+ 0.7+ 413/SS 1986 03 20.60691 11 18 13.08 -06 47 55.4 1.0- 0.1- 413/SS 1986 04 04.12772 11 06 40.96 -04 55 12.8 ( 3.6- 3.5-) 801/HO 1986 04 05.16007 11 06 00.40 -04 47 36.4 ( 2.3+ 1.1-) 801/HO 1986 04 05.20583 11 05 58.52 -04 47 15.6 0.5- 0.7- 675/PL 1986 04 05.21069 11 05 58.31 -04 47 13.0 0.7- 0.2- 675/PL 1986 04 05.21750 11 05 58.06 -04 47 10.3 0.4- 0.5- 675/PL 1986 04 08.15569 11 04 08.69 -04 26 09.1 0.1- 0.2- 675/PL 1986 04 08.16097 11 04 08.49 -04 26 06.7 0.2- 0.0 675/PL 1986 04 08.17083 11 04 08.14 -04 26 02.6 0.0 0.1- 675/PL 1986 05 10.15791 10 55 37.90 -01 43 08.2 0.3+ 0.5- 691/ST 1986 05 10.17935 10 55 37.94 -01 43 03.9 0.4+ 0.0 691/ST 1986 05 10.19726 10 55 37.99 -01 43 00.5 0.6+ 0.1+ 691/ST 1986 05 12.08925 10 55 44.75 -01 37 30.1 ( 3.7- 4.4+) 801/HO 1986 06 07.15793 11 02 57.73 -01 06 55.4 0.0 0.8+ 691/ST 1986 06 07.16865 11 02 58.00 -01 06 56.3 0.2- 0.1+ 691/ST 1986 06 07.22340 11 02 59.45 -01 06 57.3 0.1- 0.0 691/ST ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1987 August 20