OAA computing section circular NK 522 Periodic Comet Russell 2 1980 III = 1987q
The following improved orbital elements, by S. Nakano, are from 14 observations 1980 to 1987. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.29 arc seconds. Epoch = 1987 June 14.0 ET T = 1987 July 3.76743 +/- 0.02465 (m.e.) ET Peri. = 245.38044 +/- 0.02518 Node = 44.43178 +/- 0.02479 (1950.0) Inc. = 12.52990 +/- 0.00329 q = 2.1513926 +/- 0.0000595 AU e = 0.4178062 +/- 0.0000161 a = 3.6953204 +/- 0.0000022 AU n_ = 0.13874774 +/- 0.00000013 P = 7.104 +/- 0.0000064 years T = 1980 May 19.05205 ET Epoch = 1980 May 1.0 ET Peri. = 245.17597 e = 0.4167818 Node = 44.50850 (1950.0) a = 3.7010715 AU Inc. = 12.52660 n_= 0.13842447 q = 2.1585321 AU P = 7.120 years The predicted orbit for the 1994 return is as follows: T = 1994 Oct. 27.37598 ET Epoch = 1994 Oct. 15.0 ET Peri. = 249.16368 e = 0.3996651 Node = 41.85677 (1950.0) a = 3.7920375 AU Inc. = 12.03677 n_= 0.13347353 q = 2.2764923 AU P = 7.384 years The following residuals in seconds of arc are from the above orbital elements: ate/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1980 08 09.62245 22 11 51.86 -35 07 58.4 1.8+ 0.1+ 413/SS 1980 09 28.42852 21 44 40.86 -32 07 17.2 0.6- 1.3- 413/SS 1980 10 02.41597 21 44 59.51 -31 30 05.6 0.2+ 1.5+ 413/SS 1980 10 03.40961 21 45 08.09 -31 20 33.3 1.8- 0.3+ 413/SS 1980 10 06.43113 21 45 44.37 -30 50 49.6 2.2- 0.1+ 413/SS 1980 10 06.56111 21 45 46.46 -30 49 30.3 1.4+ 1.3+ 323/PR 1980 10 07.52916 21 46 02.15 -30 39 59.9 (10.2+ 12.6-) 323/PR 1987 07 01.79167 20 18 11.94 -40 51 45.8 0.4- 1.9+ 323/PR 1987 07 02.70417 20 17 49.30 -40 59 21.0 ( 0.1+ 3.0+) 323/PR 1987 07 02.79792 20 17 46.51 -41 00 10.8 0.2- 0.4- 323/PR 1987 07 04.76313 20 16 51.76 -41 16 02.5 1.8- 0.4+ 413/SS 1987 07 06.83264 20 15 48.24 -41 31 59.7 0.3- 1.8+ 323/PR 1987 07 18.62604 20 08 11.53 -42 44 18.2 0.6+ 0.6- 323/PR 1987 07 24.71319 20 03 43.00 -43 06 22.9 1.5+ 0.5- 323/PR 1987 07 31.72014 19 58 45.35 -43 17 13.6 ( 3.5+ 1.5-) 323/PR 1987 08 18.62153 19 50 23.67 -42 37 10.1 1.5+ 2.1- 323/PR 1987 08 28.62778 19 49 54.27 -41 40 10.9 1.3- 2.2- 323/PR ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1987 December 10