OAA computing section circular NK 523 Periodic Comet Wiseman-Skiff 1986 XV = 1987b
The following improved orbital elements, by S. Nakano, are from 38 observations 1986 Dec. 28 to 1987 May 25. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.08 arc seconds. Epoch = 1986 Nov. 26.0 ET T = 1986 Nov. 22.76018 +/- 0.00131 (m.e.) ET Peri. = 171.76656 +/- 0.00207 Node = 271.00440 +/- 0.00187 (1950.0) Inc. = 18.19688 +/- 0.00069 q = 1.5050419 +/- 0.0000781 AU e = 0.5686552 +/- 0.0000157 a = 3.4891855 +/- 0.0001295 AU nß = 0.15122305 +/- 0.00000842 P = 6.518 +/- 0.0003629 years (+/- 0.13 day) The predicted orbit for the 1993 return is as follows: T = 1993 June 4.39410 ET Epoch = 1993 June 22.0 ET Peri. = 171.92486 e = 0.5678347 Node = 270.93933 (1950.0) a = 3.4920919 AU Inc. = 18.18498 nß= 0.15103430 q = 1.5091611 AU P = 6.526 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 12 28.29426 08 03 23.21 +08 18 50.4 1.3+ 0.1+ 688/LO 1986 12 28.33910 08 03 21.01 +08 17 32.3 0.0 0.1- 688/LO 1987 01 01.64283 08 00 01.52 +06 16 15.6 ( 4.3- 0.5-) 892/YM 1987 01 09.59402 07 52 59.42 +02 56 16.7 ( 2.5+ 5.8+) 413/SS 1987 01 09.65652 07 52 55.60 +02 54 49.1 ( 1.7+ 4.2+) 413/SS 1987 01 19.11111 07 44 24.91 -00 13 30.0 2.5- 1.0- 688/LO 1987 01 19.13194 07 44 24.03 -00 13 52.3 0.8+ 2.3- 688/LO 1987 01 20.50277 07 43 14.67 -00 36 10.6 1.4- 0.1- 892/YM 1987 01 20.53211 07 43 13.17 -00 36 43.8 ( 0.4- 5.4-) 892/YM 1987 01 20.62604 07 43 08.24 -00 38 04.9 0.5+ 2.0+ 372/sk 1987 01 21.19722 07 42 40.63 -00 47 00.8 0.1+ 0.0 690/LW 1987 01 21.20347 07 42 40.18 -00 47 09.8 ( 1.7- 3.3-) 688/LO 1987 01 21.23125 07 42 38.79 -00 47 33.8 0.6- 1.7- 688/LO 1987 01 22.20972 07 41 52.05 -01 02 15.0 ( 3.3+ 0.4-) 688/LO 1987 01 22.23056 07 41 50.77 -01 02 36.4 ( 0.2+ 3.4-) 688/LO - continued - P/Wiseman-Skiff NK 523 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1987 01 22.59878 07 41 33.40 -01 07 57.7 ( 4.8+ 2.6-) 892/YM 1987 01 24.33229 07 40 13.56 -01 31 59.3 0.5- 0.2- 690/LW 1987 01 24.47674 07 40 07.93 -01 33 51.6 0.7+ 2.2+ 372/sk 1987 01 25.68472 07 39 14.72 -01 49 22.5 0.7+ 1.8+ 372/sk 1987 01 27.20247 07 38 12.50 -02 07 36.6 0.2+ 0.4- 801/HO 1987 01 27.70903 07 37 52.42 -02 13 06.3 0.3+ 0.3- 323/PR 1987 01 28.66424 07 37 15.93 -02 23 42.7 1.4- 0.8+ 372/sk 1987 01 30.56719 07 36 08.7 -02 42 51 ( 4.5- 8.8-) 897/kj Y 1987 01 30.58270 07 36 08.4 -02 43 00 ( 1.2- 9.0-) 897/kj Y 1987 01 31.51804 07 35 38.05 -02 51 23.7 1.0- 2.2- 413/SS 1987 01 31.58749 07 35 35.59 -02 51 59.2 0.6- 0.5- 413/SS 1987 01 31.62361 07 35 34.3 -02 52 33 ( 5.9- 9.4-) 897/kj Y 1987 02 01.29753 07 35 13.82 -02 58 23.2 0.4- 1.2- 688/LO 1987 02 01.30816 07 35 13.46 -02 58 28.6 0.4- 1.2- 688/LO 1987 02 01.32726 07 35 12.88 -02 58 36.1 0.7+ 0.5+ 691/ST 1987 02 02.69514 07 34 33.87 -03 09 29.7 1.3+ 0.1- 323/PR 1987 02 03.71458 07 34 07.28 -03 17 04.6 1.3+ 2.0+ 323/PR 1987 02 04.70139 07 33 43.80 -03 23 56.8 1.5+ 1.7+ 323/PR 1987 02 05.57222 07 33 25.15 -03 29 37.6 0.7- 0.2+ 323/PR 1987 03 08.25686 07 39 33.19 -04 07 28.2 0.2- 0.4- 688/LO 1987 03 08.26660 07 39 33.60 -04 07 27.2 0.2+ 0.4- 688/LO 1987 03 27.25102 07 57 05.65 -03 30 30.2 1.1+ 0.2- 691/ST 1987 03 27.26073 07 57 06.19 -03 30 28.9 0.3- 0.0 691/ST 1987 03 27.26642 07 57 06.63 -03 30 27.3 0.7+ 1.0+ 691/ST 1987 05 01.13729 08 43 47.48 -03 09 52.3 0.2+ 0.7+ 691/ST 1987 05 01.14253 08 43 47.90 -03 09 52.1 0.4- 1.2+ 691/ST 1987 05 01.15832 08 43 49.31 -03 09 54.5 0.1- 0.3- 691/ST 1987 05 02.13494 08 45 16.88 -03 10 53.1 0.1- 0.6+ 691/ST 1987 05 02.14037 08 45 17.27 -03 10 52.1 1.5- 1.9+ 691/ST 1987 05 02.15605 08 45 18.72 -03 10 53.4 0.5- 1.6+ 691/ST 1987 05 23.15816 09 17 36.24 -03 54 29.7 0.3- 1.3- 691/ST 1987 05 23.17252 09 17 37.67 -03 54 32.6 1.1+ 1.6- 691/ST 1987 05 25.16081 09 20 44.69 -04 00 46.9 0.1- 1.9- 691/ST 1987 05 25.17133 09 20 45.72 -04 00 49.0 0.6+ 2.0- 691/ST ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1988 Novermber 1