OAA computing section circular NK 489 Periodic Comet Harrington 1953 VI = 1960 VII = 1980 XIV
The following improved orbital elements, by S. Nakano, are from 28 observations 1953 to 1980, including full planetary per- turbations and non-gravitational effect of style II. The mean residual is +/- 1.49 arc seconds. The comet passed 0.50 AU from Jupiter on 1956 October. Epoch = 1980 Dec. 27.0 ET T = 1980 Dec. 24.59668 +/- 0.00286 (m.e.) ET Peri. = 233.02827 +/- 0.00182 Node = 118.95447 +/- 0.00172 (1950.0) Inc. = 8.65187 +/- 0.00029 q = 1.6045195 +/- 0.0000079 AU e = 0.5557564 +/- 0.0000022 a = 3.6118011 +/- 0.0000019 AU nß = 0.14358806 +/- 0.000000002 P = 6.864 +/- 0.0000053 years A1 = +0.561 +/- 0.025 A2 = +0.11178 +/- 0.00116 T = 1953 Sept.22.14642 ET Epoch = 1953 Sept.20.0 ET Peri. = 219.37147 e = 0.5359039 Node = 136.62200 (1950.0) a = 3.6500255 AU Inc. = 11.60042 nß= 0.14133842 q = 1.6939626 AU P = 6.973 years T = 1960 June 28.18659 ET Epoch = 1960 July 5.0 ET Peri. = 232.82288 e = 0.5591955 Node = 119.16054 (1950.0) a = 3.5899025 AU Inc. = 8.68858 nß= 0.14490391 q = 1.5824451 AU P = 6.802 years [ T = 1967 Apr. 23.52436 ET Epoch = 1967 Apr. 20.0 ET Peri. = 232.97358 e = 0.5584565 Node = 119.06570 (1950.0) a = 3.5954048 AU Inc. = 8.68062 nß= 0.14457140 q = 1.5875275 AU P = 6.817 years ] [ T = 1974 Feb. 17.41664 ET Epoch = 1974 Feb. 2.0 ET Peri. = 232.98690 e = 0.5567492 Node = 119.00151 (1950.0) a = 3.6043594 AU Inc. = 8.66229 nß= 0.14403298 q = 1.5976353 AU P = 6.843 years ] The predicted orbit for the 1987 return is as follows: T = 1987 Oct. 31.86259 ET Epoch = 1987 Oct. 12.0 ET Peri. = 233.03289 e = 0.5571294 Node = 118.94361 (1950.0) a = 3.6036797 AU Inc. = 8.65799 nß= 0.14407373 q = 1.5959640 AU P = 6.841 years - continued - NK 489 - 2 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 ¡ , " " " 1953 08 15.39375 23 43 26.48 -10 46 07.0 1.6- 1.4- 675/ht 1953 08 16.40417 23 44 06.46 -10 59 53.0 1.0- 1.7- 675/ht 1953 08 18.37639 23 45 20.35 -11 27 26.8 0.5- 0.3- 675/ht 1953 09 03.45137 23 51 55.77 -15 34 35.9 2.4+ 1.2- 675/ht 1953 09 05.41249 23 52 20.96 -16 05 22.7 0.6+ 1.4- 675/ht 1953 09 10.32663 23 53 07.15 -17 20 19.0 0.1+ 1.2- 662/rm 1953 09 15.32599 23 53 34.14 -18 31 08.5 0.1+ 0.3+ 754/vb 1953 09 15.33988 23 53 34.18 -18 31 18.3 0.5+ 1.6+ 754/vb 1953 09 16.30065 23 53 38.49 -18 44 06.0 1.1+ 0.3- 662/jf 1953 09 16.32356 23 53 38.48 -18 44 24.3 1.2+ 0.5- 662/jf 1953 09 17.25655 23 53 41.62 -18 56 29.3 0.4+ 0.8+ 754/vb 1953 10 01.14145 23 54 33.60 -21 14 06.0 (43.8+ 0.3-) 754/vb 1953 10 01.15811 23 54 33.62 -21 14 13.6 (43.6+ 1.1-) 754/vb 1953 10 02.24943 23 54 34.88 -21 21 10.9 (25.6- 0.2+) 754/vb 1953 10 02.27292 23 54 37.10 -21 21 19.7 0.6- 0.5- 662/jf 1953 10 02.29722 23 54 37.23 -21 21 28.6 0.5+ 0.5- 662/jf 1953 10 15.19880 23 57 16.91 -21 57 07.5 1.1- 0.1+ 754/vb 1953 10 29.12856 00 04 01.05 -21 05 48.1 0.2+ 0.9+ 754/vb 1953 11 10.05308 00 13 14.13 -19 22 50.2 ( 7.1- 0.5-) 754/vb 1953 12 10.12845 00 48 12.96 -12 40 15.2 1.0- 2.0+ 662/rm 1953 12 10.19222 00 48 18.05 -12 39 17.7 1.4- 1.0+ 662/rm 1960 08 03.44790 03 28 18.15 +09 21 57.7 0.6+ 1.0- 689/FS 1960 08 04.43580 03 30 35.35 +09 26 28.4 2.8- 1.8- 689/FS 1960 08 19.40781 04 03 01.33 +10 15 47.0 1.4+ 0.5+ 689/FS 1960 08 19.45490 04 03 06.85 +10 15 53.5 0.2+ 0.8+ 689/FS 1960 10 01.42101 05 02 31.05 +10 01 10.8 0.8- 1.8+ 689/FS 1960 10 01.47606 05 02 33.06 +10 01 03.9 0.2- 1.0+ 689/FS 1960 10 25.39036 05 06 01.73 +09 17 58.6 0.4- 0.9+ 689/FS 1960 10 26.38899 05 05 40.06 +09 16 41.2 1.3+ 0.4+ 689/FS 1960 10 26.45686 05 05 38.24 +09 16 35.8 0.2+ 0.0 689/FS 1980 09 04.49653 17 27 28.93 -22 05 00.8 2.9+ 4.1+ 323/PR 1980 09 08.50451 17 31 54.94 -22 29 01.2 ( 5.6+ 18.4+) 323/PR 1980 09 09.51042 17 33 06.46 -22 35 12.1 0.3- 6.2+ 323/PR 1980 10 06.50417 18 17 13.17 -24 47 13.5 (12.1- 14.6-) 323/PR ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1985 December 22