OAA computing section circular NK 521 Periodic Comet du Toit-Hartley 1982 II = 1986q
The following improved orbital elements, by S. Nakano, are from 47 observations 1982 to 1987. Perturbations by all nine planets were taken into account. The mean residual is +/- 0.93 arc seconds. Epoch = 1987 June 14.0 ET T = 1987 June 14.01053 +/- 0.00037 (m.e.) ET Peri. = 251.65325 +/- 0.00066 Node = 308.55720 +/- 0.00066 (1950.0) Inc. = 2.93797 +/- 0.00005 q = 1.1990587 +/- 0.0000005 AU e = 0.6012381 +/- 0.0000002 a = 3.0069540 +/- 0.0000003 AU n_ = 0.18902267 +/- 0.00000003 P = 5.214 +/- 0.0000008 years T = 1982 Mar. 30.44250 ET Epoch = 1982 Mar. 12.0 ET Peri. = 251.66649 e = 0.6023338 Node = 308.59192 (1950.0) a = 3.0044075 AU Inc. = 2.93961 n_= 0.18926305 q = 1.1947512 AU P = 5.208 years The predicted orbit for the 1992 return is as follows: T = 1992 Aug. 27.61324 ET Epoch = 1992 Sept.15.0 ET Peri. = 251.56849 e = 0.6016264 Node = 308.56327 (1950.0) a = 3.0051143 AU Inc. = 2.93822 n_= 0.18919628 q = 1.1971582 AU P = 5.209 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 ! , " " " 1982 02 05.73327 12 31 58.81 -07 04 10.1 1.8- 1.4- 413/SS 1982 02 06.75184 12 34 51.53 -07 31 24.4 ( 0.4+ 4.1-) 413/SS 1982 02 07.75149 12 37 42.97 -07 58 15.8 ( 2.1- 6.7+) 413/SS 1982 02 16.68478 13 04 58.40 -12 14 40.8 ( 1.5- 3.7+) 413/SS 1982 02 17.71875 13 08 20.28 -12 46 21.2 1.8- 0.6- 372/sk 1982 02 18.44688 13 10 43.86 -13 08 33.9 1.7+ 1.0- 707/ev 1982 02 19.52813 13 14 21.07 -13 41 10.7 ( 4.5+ 4.1+) 474/JN 1982 02 19.55718 13 14 26.75 -13 42 06.4 ( 4.0+ 2.5+) 474/JN 1982 02 19.68588 13 14 52.06 -13 46 10.5 0.1+ 1.5+ 413/SS 1982 02 19.70741 13 14 56.18 -13 46 52.0 0.8- 0.0 413/SS 1982 02 20.44861 13 17 25.67 -14 10 12.4 (10.4- 2.0-) 688/LO 1982 02 20.48194 13 17 31.78 -14 11 05.0 (16.7- 7.3+) 688/LO 1982 02 20.67989 13 18 13.55 -14 16 51.3 ( 0.9+ 3.0+) 474/JN 1982 02 22.67419 13 25 06.51 -15 19 17.4 0.2+ 1.7- 474/JN 1982 02 22.68750 13 25 09.25 -15 19 41.9 0.7+ 1.1- 474/JN - continued - P/du Toit-Hartley NK 521 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1982 02 24.41597 13 31 16.31 -16 14 47.4 0.8+ 0.9- 707/ev 1982 02 24.46007 13 31 25.39 -16 16 11.2 0.1+ 0.9- 707/ev 1982 02 25.78507 13 36 12.3 -16 58 14 ( 1.0- 3.4+) 372/sk Y 1982 02 28.45764 13 46 06.43 -18 23 45.0 ( 3.6+ 1.5-) 675/PL 1982 02 28.49236 13 46 13.78 -18 24 47.3 ( 1.0+ 2.8+) 675/PL 1982 03 21.51042 15 13 39.22 -28 44 31.0 1.0- 1.2+ 474/JN 1982 03 21.52465 15 13 42.99 -28 44 52.9 0.6+ 0.7+ 474/JN 1982 03 27.58866 15 39 55.91 -30 57 07.4 1.6- 1.7+ 474/JN 1982 03 27.59641 15 39 57.88 -30 57 16.8 0.8- 1.5+ 474/JN 1982 04 22.41736 17 07 55.38 -34 54 42.7 0.9- 0.3+ 707/ev 1982 04 23.69558 17 10 41.28 -34 54 52.6 0.3- 0.9+ 474/JN 1982 04 23.71271 17 10 43.33 -34 54 52.2 0.5+ 1.2+ 474/JN 1982 05 25.204 17 32 34.52 -32 34 28.5 1.1+ 2.3- 809/ES 1982 05 26.230 17 32 11.75 -32 26 40.8 ( 2.8+ 5.0-) 809/ES 1982 05 26.289 17 32 09.89 -32 26 12.8 ( 4.0+ 4.5-) 809/ES 1982 05 28.61795 17 31 11.02 -32 07 48.5 0.5+ 0.5- 474/JN 1982 05 28.63959 17 31 10.30 -32 07 37.5 0.8+ 0.2- 474/JN 1982 06 23.46492 17 18 58.42 -28 38 01.9 0.6+ 0.6- 474/JN 1982 06 23.48645 17 18 57.92 -28 37 51.9 0.3+ 0.1- 474/JN 1986 12 27.33888 06 57 03.42 +25 26 16.5 0.5- 0.4+ 691/ST 1986 12 27.34874 06 57 02.63 +25 26 17.3 0.7- 0.7+ 691/ST 1986 12 27.36418 06 57 01.46 +25 26 18.1 0.2- 0.7+ 691/ST 1986 12 28.31181 06 55 49.37 +25 27 08.3 0.5- 0.1- 691/ST 1986 12 28.33734 06 55 47.33 +25 27 10.6 0.5- 0.9+ 691/ST 1986 12 28.35090 06 55 46.22 +25 27 11.8 0.8- 1.4+ 691/ST 1987 01 03.30704 06 47 42.19 +25 31 10.9 0.0 0.0 691/ST 1987 01 03.31806 06 47 41.18 +25 31 11.3 0.6- 0.1+ 691/ST 1987 01 03.33416 06 47 39.79 +25 31 12.1 0.2- 0.5+ 691/ST 1987 01 03.35053 06 47 38.36 +25 31 12.2 0.1- 0.2+ 691/ST 1987 01 03.36205 06 47 37.35 +25 31 12.3 0.0 0.0 691/ST 1987 01 25.29582 06 16 11.89 +25 17 13.8 1.0- 0.7- 691/ST 1987 01 25.30191 06 16 11.40 +25 17 13.1 1.0- 0.7- 691/ST 1987 01 25.31369 06 16 10.49 +25 17 12.1 0.7- 0.4- 691/ST 1987 03 27.18610 06 23 42.94 +22 46 42.9 2.1+ 0.1+ 691/ST 1987 03 27.20446 06 23 44.57 +22 46 39.6 1.6+ 0.4+ 691/ST 1987 03 27.22039 06 23 46.02 +22 46 35.8 1.6+ 0.2- 691/ST 1987 03 28.13303 06 25 12.09 +22 43 45.0 1.6+ 0.3- 691/ST 1987 03 28.16487 06 25 14.95 +22 43 38.6 0.4+ 0.4- 691/ST 1987 03 28.19818 06 25 18.05 +22 43 31.7 0.4+ 0.6- 691/ST 1987 05 01.16645 07 39 37.67 +19 40 34.9 1.8+ 0.1+ 691/ST 1987 05 01.17333 07 39 38.81 +19 40 30.6 2.2+ 0.6- 691/ST 1987 05 01.18965 07 39 41.36 +19 40 22.6 1.0+ 0.1- 691/ST 1987 05 25.16631 08 51 50.44 +15 01 16.8 1.2- 0.7- 691/ST 1987 05 25.18120 08 51 53.38 +15 01 03.8 0.6- 0.2- 691/ST 1987 05 25.19029 08 51 55.12 +15 00 55.2 1.1- 0.5- 691/ST ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1987 December 10