OAA computing section circular NK 497 Periodic Comet Singer Brewster (1986d)
The following improved orbital elements, by S. Nakano, are from 45 observations 1986 May 3 to Sept. 6. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.18 arc seconds: Epoch = 1986 June 19.0 ET T = 1986 June 8.97025 +/- 0.01567 (m.e.) ET Peri. = 45.35637 +/- 0.01107 Node = 192.73496 +/- 0.00935 (1950.0) Inc. = 9.31105 +/- 0.00150 q = 1.9554218 +/- 0.0002473 AU e = 0.4265925 +/- 0.0000461 a = 3.4101781 +/- 0.0003328 AU n_ = 0.15650870 +/- 0.00002290 P = 6.297 +/- 0.0009219 years (+/- 0.34 day) The predicted orbit for the 1992 return is as follows: T = 1992 Oct. 28.15265 ET Epoch = 1992 Oct. 25.0 ET Peri. = 46.67380 e = 0.4138999 Node = 191.90425 (1950.0) a = 3.4579653 AU Inc. = 9.19905 n_= 0.15327563 q = 2.0267137 AU P = 6.430 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 05 03.33681 14 50 10.59 -06 34 02.2 0.0 1.7- 675/PL 1986 05 03.36250 14 50 10.09 -06 33 49.5 ( 4.2+ 4.6-) 675/PL 1986 05 05.58939 14 49 09.04 -06 11 17.6 1.4+ 1.0- 474/JN 1986 05 05.59965 14 49 08.95 -06 11 23.3 1.8+ 0.4- 399/ue 1986 05 05.60414 14 49 08.47 -06 11 06.5 0.5- 1.3+ 474/JN 1986 05 05.62677 14 49 08.16 -06 11 04.3 2.3+ 2.5+ 399/ue 1986 05 06.48128 14 48 44.81 -06 02 30.5 1.1+ 1.5+ 474/JN 1986 05 06.50275 14 48 44.13 -06 02 17.7 0.6+ 1.8+ 474/JN 1986 05 06.54479 14 48 42.98 -06 02 05.8 2.1- 0.3+ 372/sk 1986 05 06.57292 14 48 42.26 -06 01 52.7 0.1- 2.9- 372/sk 1986 05 08.30486 14 47 54.57 -05 45 12.8 1.8- 2.0+ 657/VC 1986 05 08.52307 14 47 48.71 -05 42 59.8 0.9+ 1.4- 474/JN 1986 05 08.54280 14 47 48.34 -05 42 48.4 ( 4.3+ 1.2-) 474/JN 1986 05 08.69028 14 47 44.02 -05 41 26.2 0.1- 0.5- 323/PR 1986 05 09.19961 14 47 30.17 -05 36 51.4 0.5- 0.5- 801/HO 1986 05 10.22230 14 47 02.41 -05 27 25.9 1.2- 0.3+ 801/HO 1986 05 10.23472 14 47 02.14 -05 27 17.2 0.0 1.9+ 293/h3 1986 05 10.25069 14 47 01.68 -05 27 09.4 0.2+ 1.0+ 293/h3 1986 05 13.26042 14 45 42.54 -05 00 44.8 ( 3.2- 4.3-) 688/LO 1986 05 13.36528 14 45 39.80 -04 59 51.5 ( 0.7+ 4.4-) 688/LO - continued - P/Singer Brewster NK 497 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1986 05 14.49321 14 45 11.56 -04 50 14.0 0.1+ 2.3- 474/JN 1986 05 14.51149 14 45 11.05 -04 50 04.7 0.0 2.0- 474/JN 1986 05 14.65903 14 45 07.18 -04 48 59.6 0.8- 1.8+ 372/sk 1986 05 16.68542 14 44 18.77 -04 32 49.5 ( 4.6+ 1.7-) 323/PR 1986 05 28.56458 14 40 51.77 -03 20 30.3 0.2+ 1.9+ 323/PR 1986 05 29.64028 14 40 41.24 -03 15 59.2 1.2+ 0.1+ 323/PR 1986 05 30.55625 14 40 33.85 -03 12 22.7 0.2- 0.6+ 323/PR 1986 06 03.10982 14 40 16.14 -03 00 58.4 1.3+ 0.1- 801/HO 1986 06 04.30972 14 40 14.13 -02 57 54.6 1.1- 0.5- 675/PL 1986 06 04.61632 14 40 14.17 -02 57 01.1 1.6- 1.3+ 323/PR 1986 06 05.17063 14 40 14.46 -02 55 59.3 0.3- 0.3+ 801/HO 1986 06 06.28924 14 40 16.51 -02 53 48.5 0.6+ 0.7+ 707/ev 1986 06 06.31801 14 40 16.54 -02 53 45.3 0.6+ 0.1- 691/ST 1986 06 06.32352 14 40 16.56 -02 53 44.8 0.9+ 0.2- 691/ST 1986 06 06.32674 14 40 16.50 -02 53 43.9 0.6- 0.6+ 675/PL 1986 06 06.32674 14 40 16.50 -02 53 43.9 0.6- 0.6+ 675/PL 1986 06 07.27841 14 40 19.98 -02 52 14.7 0.7- 2.8- 691/ST 1986 06 07.31480 14 40 20.05 -02 52 11.3 0.7- 2.7- 691/ST 1986 06 07.35096 14 40 20.12 -02 52 07.9 0.9- 2.5- 691/ST 1986 06 12.33924 14 41 03.21 -02 48 28.3 0.5- 0.7- 707/ev 1986 07 06.23332 14 54 00.33 -03 57 07.3 0.3- 0.5- 691/ST 1986 07 06.24080 14 54 00.69 -03 57 09.4 0.5- 0.2- 691/ST 1986 07 06.25243 14 54 01.27 -03 57 13.6 0.3- 0.7- 691/ST 1986 07 08.08697 14 55 38.15 -04 07 05.1 ( 4.8+ 7.0+) 801/HO 1986 07 11.59792 14 58 55.83 -04 27 32.9 ( 3.6+ 0.3-) 323/PR 1986 07 12.23681 14 59 33.43 -04 31 33.3 0.3+ 1.4+ 707/ev 1986 07 27.19126 15 16 45.88 -06 15 14.4 0.8+ 0.6+ 691/ST 1986 07 27.19777 15 16 46.42 -06 15 17.7 1.5+ 0.2+ 691/ST 1986 07 27.20872 15 16 47.20 -06 15 21.8 0.7+ 1.0+ 691/ST 1986 09 06.12876 16 21 57.24 -11 32 01.7 0.3+ 0.6- 691/ST 1986 09 06.13711 16 21 58.13 -11 32 03.1 0.1+ 1.5+ 691/ST 1986 09 06.14189 16 21 58.58 -11 32 06.9 0.9- 0.3- 691/ST ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1987 August 20