OAA computing section circular NK 531 Periodic Comet Parker-Hartley

The following improved orbital elements, by S. Nakano, are from 25 observations 1986 Sept. 29 to 1989 Mar. 26. Perturba- tions by all nine planets were taken into account. The mean residual is +/- 1.12 arc seconds. Epoch = 1987 Sept. 2.0 ET T = 1987 Aug. 17.53785 +/- 0.46606 (m.e.) ET Peri. = 181.38039 +/- 0.14460 Node = 243.57094 +/- 0.13288 (1950.0) Inc. = 5.19307 +/- 0.03013 q = 3.0273397 +/- 0.0008552 AU e = 0.2923382 +/- 0.0001368 a = 4.2779470 +/- 0.0008815 AU n = 0.11139123 +/- 0.00003405 P = 8.848 +/- 0.0027408 years (+/- 1.00 day) The predicted orbit for the 1996 return is as follows: T = 1996 June 25.43751 ET Epoch = 1996 June 6.0 ET Peri. = 181.26677 e = 0.2902365 Node = 243.54756 (1950.0) a = 4.2920184 AU Inc. = 5.18545 n = 0.11084388 q = 3.0463179 AU P = 8.892 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 09 29.84417 23 54 07.78 +06 19 48.0 0.1+ 1.8- 046/KL 1986 09 29.85863 23 54 07.14 +06 19 46.0 1.4- 0.3+ 046/KL 1986 09 30.84086 23 53 31.52 +06 15 05.4 0.2+ 0.7+ 046/KL 1986 09 30.85544 23 53 31.02 +06 15 01.6 0.8+ 1.1+ 046/KL 1986 10 01.88229 23 52 53.85 +06 10 04.5 0.8+ 0.4- 046/KL 1986 10 01.89670 23 52 53.19 +06 10 00.4 1.1- 0.3- 046/KL 1986 10 03.92907 23 51 40.61 +06 00 11.9 0.6+ 1.0+ 054/CB 1986 10 04.94836 23 51 04.57 +05 55 14.5 0.7- 0.8+ 054/CB 1986 10 08.91502 23 48 48.82 +05 35 52.6 0.8- 1.4- 054/CB 1986 10 08.93516 23 48 48.28 +05 35 48.0 1.4+ 0.1- 054/CB 1989 02 11.63317 10 52 05.32 -00 04 23.6 (29.4- 8.3+) 413/SS 1989 02 11.75817 10 52 02.52 -00 04 11.3 ( 6.9- 0.4-) 413/SS 1989 03 02.53721 10 40 44.30 +01 00 49.3 0.3- 0.1- 413/SS 1989 03 02.58929 10 40 42.33 +01 01 01.2 0.2- 0.5- 413/SS 1989 03 03.45745 10 40 10.36 +01 04 29.1 0.5+ 0.8+ 474/JN - continued - P/Parker-Hartley NK 531 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s . , " " " 1989 03 03.50497 10 40 08.45 +01 04 41.2 1.3- 1.5+ 474/JN 1989 03 04.50549 10 39 31.78 +01 08 37.9 1.1+ 1.0- 474/JN 1989 03 04.53384 10 39 30.72 +01 08 44.6 1.2+ 1.1- 474/JN 1989 03 04.69412 10 39 24.72 +01 09 22.5 0.9+ 1.1- 413/SS 1989 03 05.58784 10 38 52.07 +01 12 57.4 0.4+ 1.4- 413/SS 1989 03 06.04306 10 38 35.31 +01 14 47.1 1.2- 1.8+ 010/IC 1989 03 06.06389 10 38 34.72 +01 14 50.3 1.6+ 0.0 010/IC 1989 03 08.60203 10 37 02.97 +01 25 05.6 1.6- 1.7- 897/kj 1989 03 08.64375 10 37 00.87 +01 25 19.3 (10.1- 1.8+) 897/kj 1989 03 08.64444 10 37 01.39 +01 25 18.5 2.1- 0.7+ 372/sk 1989 03 08.65764 10 37 00.80 +01 25 24.7 ( 3.7- 3.7+) 372/sk 1989 03 11.60278 10 35 17.49 +01 37 23.0 1.9+ 2.2+ 372/sk 1989 03 11.61597 10 35 16.87 +01 37 25.4 0.4- 1.4+ 372/sk 1989 03 26.83160 10 27 30.99 +02 37 15.1 ( 5.7+ 2.0-) 046/KL 1989 03 26.84572 10 27 30.21 +02 37 18.4 0.4- 1.8- 046/KL ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1989 May 5

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