OAA computing section circular NK 510 Periodic Comet Kowal-Mrkos 1984 X
The following improved orbital elements, by S. Nakano, are from eight observations 1984 Apr. 23 to May 19. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.28 arc seconds: Epoch = 1984 May 20.0 ET T = 1984 June 7.64394 +/- 0.70450 (m.e.) ET Peri. = 338.11152 +/- 2.21099 Node = 248.49830 +/- 2.19430 (1950.0) Inc. = 2.95692 +/- 0.12617 q = 1.9510902 +/- 0.0083127 AU e = 0.4826170 +/- 0.0017610 a = 3.7710752 +/- 0.0096641 AU n_ = 0.13458798 +/- 0.00051736 P = 7.323 +/- 0.0281506 years (+/-10.3 days) The predicted orbit for the 1991 return is as follows: T = 1991 July 19.06657 ET Epoch = 1991 July 3.0 ET Peri. = 315.94924 e = 0.3943160 Node = 244.80646 (1950.0) a = 4.4039829 AU Inc. = 5.30948 n_= 0.10664381 q = 2.6674218 AU P = 9.242 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 ! , " " " 1984 04 23.29931 13 11 22.88 -11 49 00.8 1.2- 0.1- 675/PL 1984 04 23.32014 13 11 22.38 -11 48 55.1 0.7+ 0.8- 675/PL 1984 04 30.25903 13 08 36.41 -11 14 24.1 1.2+ 1.4+ 675/PL 1984 04 30.27292 13 08 36.09 -11 14 19.0 1.2+ 2.5+ 675/PL 1984 05 02.88564 13 07 48.02 -11 02 12.1 0.4+ 1.7- 046/KL 1984 05 02.89987 13 07 47.56 -11 02 07.9 2.4- 1.4- 046/KL 1984 05 19.91340 13 06 58.68 -10 04 20.6 0.9- 0.3- 046/KL 1984 05 19.92752 13 06 58.95 -10 04 18.2 1.0+ 0.4+ 046/KL ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1987 August 20