OAA computing section circular NK 500 Periodic Comet Russell 1 1979 V = 1985 IX
The following improved orbital elements, by S. Nakano, are from 20 observations 1979 to 1985. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.30 arc seconds: Epoch = 1979 May 7.0 ET T = 1979 May 26.97605 +/- 0.00122 (m.e.) ET Peri. = 0.22719 +/- 0.00076 Node = 230.17671 +/- 0.00044 (1950.0) Inc. = 22.65377 +/- 0.00025 q = 1.6134482 +/- 0.0000055 AU e = 0.5168268 +/- 0.0000016 a = 3.3392750 +/- 0.0000005 AU n_ = 0.16151981 +/- 0.00000003 P = 6.102 +/- 0.0000012 years T = 1985 July 5.22948 ET Epoch = 1985 June 24.0 ET Peri. = 0.39020 e = 0.5172087 Node = 230.13060 (1950.0) a = 3.3379765 AU Inc. = 22.66322 n_= 0.16161407 q = 1.6115460 AU P = 6.099 years The predicted orbit for the 1991 return is as follows: T = 1991 Jan. 4.53763 ET Epoch = 1991 Jan. 24.0 ET Peri. = 333.74061 e = 0.4383608 Node = 225.80953 (1950.0) a = 3.8724812 AU Inc. = 17.75623 n_= 0.12933620 q = 2.1749372 AU P = 7.621 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 ! , " " " 1979 02 27.71042 13 10 16.71 -38 19 44.4 1.0+ 3.2+ 413/SS 1979 06 16.4419 14 11 11.03 -03 02 11.0 0.4- 2.6+ 413/SS 1979 06 24.4549 14 22 51.76 -01 12 01.1 0.3- 1.8- 413/SS 1979 06 28.15211 14 28 35.91 -00 33 30.5 ( 6.5+ 5.3+) 801/HO 1979 06 29.50220 14 30 44.29 -00 21 03.2 1.1- 1.8+ 323/PR 1979 07 15.3944 14 57 34.19 +01 03 44.5 0.8+ 0.7+ 413/SS 1979 07 16.3958 14 59 20.68 +01 05 53.5 1.8+ 1.9- 413/SS 1979 07 18.3542 15 02 50.28 +01 09 17.7 0.3- 1.3- 413/SS 1979 07 23.3972 15 11 58.33 +01 13 03.2 3.1- 1.4+ 413/SS 1979 08 11.36389 15 47 52.57 +00 39 03.1 0.0 0.8- 413/SS 1979 08 14.07429 15 53 09.50 +00 29 53.9 1.8+ 2.4+ 801/HO 1985 04 09.23887 10 22 19.04 -25 10 36.3 1.0- 0.0 675/PL 1985 04 09.25234 10 22 19.04 -25 10 19.8 1.2- 0.3+ 675/PL 1985 04 10.21347 10 22 25.02 -24 51 02.3 0.0 0.2- 675/PL 1985 04 10.22153 10 22 25.03 -24 50 52.4 0.3- 0.1- 675/PL 1985 06 13.16067 11 49 19.40 -06 27 00.8 0.1+ 0.9- 691/ST 1985 06 13.17471 11 49 21.31 -06 26 53.2 0.7+ 0.8- 691/ST 1985 06 13.18156 11 49 22.22 -06 26 49.4 0.7+ 0.7- 691/ST 1985 06 17.16296 11 58 27.93 -05 53 52.7 0.1- 1.1- 691/ST 1985 06 17.17616 11 58 29.79 -05 53 46.3 0.8+ 0.8- 691/ST 1985 06 17.18214 11 58 30.61 -05 53 44.2 0.8+ 1.5- 691/ST ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1987 August 20