OAA computing section circular NK 483 Periodic Comet Brooks 2 1960 VI = 1974 I = 1980 IX
The following improved orbital elements, by S. Nakano, are from 38 observations 1960 to 1981, including full planetary per- turbations and non-gravitational effect of style II. The mean residual is +/- 1.64 arc seconds. Epoch = 1980 Nov. 17.0 ET T = 1980 Nov. 25.37147 +/- 0.00354 (m.e.) ET Peri. = 198.22583 +/- 0.00696 Node = 176.23375 +/- 0.00682 (1950.0) Inc. = 5.54618 +/- 0.00028 q = 1.8496538 +/- 0.0000117 AU e = 0.4898078 +/- 0.0000031 a = 3.6254056 +/- 0.0000070 AU nß = 0.14278059 +/- 0.00000001 P = 6.903 +/- 0.0000200 years A1 = +0.551 +/- 0.165 A2 = -0.16200 +/- 0.00719 T = 1960 June 17.11501 ET Epoch = 1960 July 5.0 ET Peri. = 197.09200 e = 0.5048496 Node = 176.88963 (1950.0) a = 3.5607703 AU Inc. = 5.57116 nß= 0.14668582 q = 1.7631167 AU P = 6.719 years T = 1967 Mar. 11.13283 ET Epoch = 1967 Mar. 11.0 ET Peri. = 197.24459 e = 0.5048813 Node = 176.82402 (1950.0) a = 3.5608950 AU Inc. = 5.57268 nß= 0.14667811 q = 1.7630656 AU P = 6.720 years T = 1974 Jan. 3.99297 ET Epoch = 1973 Dec. 24.0 ET Peri. = 198.15100 e = 0.4912126 Node = 176.28702 (1950.0) a = 3.6164661 AU Inc. = 5.55190 nß= 0.14331032 q = 1.8400123 AU P = 6.877 years The predicted orbit for the 1987 return is as follows: T = 1987 Oct. 16.54212 ET Epoch = 1987 Oct. 12.0 ET Peri. = 198.14074 e = 0.4906492 Node = 176.24980 (1950.0) a = 3.6218221 AU Inc. = 5.54972 nß= 0.14299255 q = 1.8447780 AU P = 6.893 years There are the residuals, in seconds of arc, from the above orbital elements on the next page: - continued - NK 483 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1960 08 04.41398 04 28 30.80 +18 25 41.4 0.6+ 2.2- 689/FS 1960 08 18.46182 05 00 17.42 +18 45 35.9 0.6+ 0.9- 689/FS 1960 09 25.45628 06 09 16.78 +17 34 36.0 0.0 1.4- 689/FS 1960 09 25.46875 06 09 17.82 +17 34 33.6 0.3+ 1.2- 689/FS 1960 10 25.43363 06 37 40.41 +15 36 54.0 0.3- 0.0 689/FS 1960 10 25.44542 06 37 40.70 +15 36 51.2 0.5- 0.1- 689/FS 1960 10 26.50811 06 38 08.49 +15 32 46.2 0.5- 0.0 689/FS 1960 11 11.24863 06 40 17.83 +14 38 58.4 1.4- 1.0- 689/FS 1960 12 18.33668 06 15 14.60 +13 58 01.3 0.2- 1.0- 689/FS 1960 12 20.29943 06 13 18.82 +13 59 46.3 0.7- 0.7- 689/FS 1960 12 20.34514 06 13 16.07 +13 59 48.8 0.0 0.9- 689/FS 1961 01 08.18958 05 56 30.21 +14 33 04.0 0.7+ 0.0 689/FS 1961 01 08.23668 05 56 28.04 +14 33 10.6 0.6+ 0.3- 689/FS 1961 02 09.19150 05 46 34.19 +16 08 55.5 0.1+ 0.1- 689/FS 1961 02 09.28638 05 46 34.86 +16 09 14.6 1.1+ 0.9+ 689/FS 1973 07 01.39306 21 00 50.08 -09 22 57.8 0.5- 0.7- 691/ST 1973 07 01.43600 21 00 49.52 -09 22 57.0 0.5- 0.6- 691/ST 1973 07 07.29704 20 59 20.57 -09 24 01.0 1.6+ 0.4+ 801/HO 1973 09 03.19375 20 24 12.09 -13 33 45.0 0.2+ 1.4- 693/CT 1973 09 03.21736 20 24 11.58 -13 33 52.7 0.2+ 1.3- 693/CT 1973 09 22.15746 20 24 08.26 -15 02 00.5 0.5+ 0.6- 691/ST 1973 09 22.18154 20 24 08.64 -15 02 05.7 0.1+ 0.7- 691/ST 1973 10 27.10637 20 55 39.92 -15 34 38.5 0.0 1.8+ 693/CT 1973 10 27.15046 20 55 43.56 -15 34 33.2 0.1- 1.9+ 693/CT 1973 11 25.07986 21 45 09.09 -13 26 15.5 1.3- 0.9- 693/CT 1980 06 13.31250 22 06 47.87 -05 44 02.8 0.5+ 1.0- 809/ES 1980 06 18.27914 22 10 58.46 -05 17 20.4 0.9- 1.8- 801/HO 1980 06 19.28881 22 11 46.56 -05 12 03.3 0.2- 5.6+ 801/HO 1980 08 07.71528 22 25 33.92 -04 13 28.3 0.6- 0.4+ 323/PR 1980 08 10.67465 22 24 39.66 -04 25 45.9 0.5+ 1.2- 323/PR 1980 08 17.24821 22 22 05.13 -04 59 45.0 2.2- 3.0- 801/HO 1980 09 09.15631 22 10 47.17 -07 43 57.8 (22.2+ 16.8+) 801/HO 1980 10 05.06731 22 07 07.73 -10 29 02.1 2.3- 1.7- 801/HO 1980 10 06.08641 22 07 24.09 -10 33 00.0 5.1+ 5.3+ 801/HO 1980 10 10.57569 22 08 58.98 -10 48 06.9 0.3+ 1.1- 323/PR 1980 10 30.56944 22 24 06.90 -10 57 11.4 0.4- 0.4+ 323/PR 1980 11 07.50972 22 33 23.06 -10 34 40.9 1.0- 0.2- 323/PR 1981 01 26.17085 00 59 23.81 +02 12 57.6 (22.8- 8.1-) 675/PL 1981 01 31.01521 01 09 41.74 +03 13 46.3 0.0 5.3+ 801/HO 1981 03 02.01661 02 14 21.51 +09 13 08.2 1.3- 4.6+ 801/HO ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1985 December 16