OAA computing section circular NK 474 Periodic Comet Russell 2 1980 III = 1980o
The following improved orbital elements, by S. Nakano, are from 6 observations 1980 Aug. 9 to Oct. 6: Perturbations by all nine planets were taken into account. The mean residual is +/- 0.98 arc seconds. Epoch = 1980 May 1.0 ET T = 1980 May 19.34011 +/- 0.33494 (m.e.) ET Peri. = 245.30303 +/- 0.38280 Node = 44.49571 +/- 0.37688 (1950.0) Inc. = 12.52631 +/- 0.05096 q = 2.1591233 +/- 0.0017439 AU e = 0.4162735 +/- 0.0003778 a = 3.6988613 +/- 0.0017869 AU nß = 0.13854855 +/- 0.00000175 P = 7.114 +/- 0.00516 years (+/- 1.88 day) The predicted orbit for the 1987 return is as follows: T = 1987 July 1.70682 ET Epoch = 1987 June 14.0 ET Peri. = 245.50745 e = 0.4173028 Node = 44.41925 (1950.0) a = 3.6930910 AU Inc. = 12.52965 nß= 0.13887340 q = 2.1519537 AU P = 7.097 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 ¡ , " " " 1980 08 09.62245 22 11 51.86 -35 07 58.4 0.0 0.0 413/SS 1980 09 28.42852 21 44 40.86 -32 07 17.2 0.1+ 0.7- 413/SS 1980 10 02.41597 21 44 59.51 -31 30 05.6 0.8+ 1.3+ 413/SS 1980 10 03.40961 21 45 08.09 -31 20 33.3 1.1- 0.0 413/SS 1980 10 06.43113 21 45 44.37 -30 50 49.6 1.7- 0.9- 413/SS 1980 10 06.56111 21 45 46.46 -30 49 30.3 1.9+ 0.3+ 323/PR 1980 10 07.52916 21 46 02.15 -30 39 59.9 (10.6+ 13.8-) 323/PR ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1985 July 7