OAA computing section circular NK 457 Periodic Comet Whipple 1963 II = 1970 XIV = 1978 VIII

The following improved orbital elements, by S. Nakano, are from 55 observations 1962 to 1978. Perturbations by all nine planets and non-gravitational effect of STYLE II were taken into account. The mean residual is +/- 1.18 arc seconds: Epoch = 1978 Apr. 2.0 ET T = 1978 Mar. 27.53860 +/- 0.00905 (m.e.) ET Peri. = 189.97470 +/- 0.00400 Node = 188.33929 +/- 0.00352 1950.0 Inc. = 10.24613 +/- 0.00028 q = 2.4686362 +/- 0.0000048 AU e = 0.3522448 +/- 0.0000010 a = 3.8110636 +/- 0.0000043 AU nß = 0.13247526 +/- 0.00000023 P = 7.440 +/- 0.0000127 years A1 = +0.286 +/- 1.026 A2 = -0.11949 +/- 0.02761 Epoch = 1963 May 11.0 1970 Oct. 21.0 ET T = 1963 Apr. 28.73207 1970 Oct. 9.41134 ET Peri. = 189.99487 189.81532 Node = 188.39199 188.39359 1950.0 Inc. = 10.24375 10.23552 q = 2.4710737 2.4795075 AU e = 0.3527396 0.3511351 a = 3.8177429 3.8213001 AU nß = 0.13212775 0.13194330 P = 7.460 7.470 years The following prediction for the 1986 return is from the above orbital elements. The comet passed 0.59 AU from Jupiter on 1981 July: T = 1986 June 24.94945 ET Epoch = 1986 June 19.0 ET Peri. = 202.04073 e = 0.2606367 Node = 181.80292 1950.0 a = 4.1622195 AU Inc. = 9.94353 nß= 0.11606910 q = 3.0773922 AU P = 8.492 years m1 = 9.7 (k=15) m2 = 14.0 (k=5) Threre are the residuals from the above orbital elements in the next pages: - continued - Periodic Comet Whipple NK 457-2 Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1962 May 4.42096 20 40 27.49 - 7 21 30.8 0.3- 0.2- 689/FS 11.42071 20 44 40.92 - 6 46 03.3 0.1+ 0.1+ 689/FS 29.38182 20 52 04.80 - 5 24 51.9 1.8- 0.5+ 689/FS July 1.33228 20 50 28.79 - 4 06 16.5 1.4+ 0.0 689/FS 8.37652 20 47 30.08 - 4 06 57.5 0.9- 0.7+ 689/FS 8.42096 20 47 28.74 - 4 06 59.5 0.8- 0.3+ 689/FS 31.27550 20 33 23.55 - 4 59 01.5 1.5+ 0.8- 689/FS 31.32203 20 33 21.50 - 4 59 12.5 1.1+ 1.0- 689/FS Sept.28.27708 20 12 30.77 -10 05 00.2 0.3- 0.0 689/FS Oct. 21.13706 20 24 26.35 -11 18 44.0 0.3- 0.8- 689/FS 21.18845 20 24 28.62 -11 18 50.1 0.9- 0.8- 689/FS 28.10942 20 30 16.72 -11 30 03.3 0.2+ 0.9+ 689/FS 28.16185 20 30 19.45 -11 30 07.1 0.6- 0.9+ 689/FS Nov. 21.08824 20 56 41.76 -11 26 14.6 0.4+ 1.2+ 689/FS 21.14414 20 56 46.11 -11 26 08.5 2.1+ 2.0+ 689/FS Dec. 21.09843 21 39 49.46 - 9 49 51.6 1.9- 0.8- 689/FS 1963 Aug. 27.41677 4 58 24.19 +15 30 55.6 0.7+ 1.1+ 689/FS Sept.23.44698 5 26 51.45 +14 03 53.4 0.6- 1.2+ 689/FS Oct. 12.44176 5 37 46.17 +12 34 37.2 0.0 0.7- 689/FS 12.49279 5 37 47.14 +12 34 22.1 0.0 0.3- 689/FS 26.30413 5 39 58.18 +11 22 38.0 1.1- 1.1+ 689/FS 26.36073 5 39 57.99 +11 22 21.1 1.7- 1.8+ 689/FS Nov. 15.30381 5 34 21.32 + 9 43 41.3 0.5+ 0.3+ 689/FS 15.35554 5 34 19.69 + 9 43 28.5 1.3+ 1.2+ 689/FS Dec. 14.35428 5 13 44.19 + 8 16 07.1 1.8- 0.0 689/FS 1964 Jan. 7.23318 4 58 19.64 + 8 24 19.3 2.7+ 0.9- 689/FS 9.24768 4 57 27.72 + 8 28 14.6 0.0 0.5+ 689/FS 9.31817 4 57 25.91 + 8 28 22.8 0.0 0.1+ 689/FS Feb. 6.20781 4 54 57.29 + 9 57 17.9 0.2- 1.3- 689/FS 6.26337 4 54 58.05 + 9 57 31.4 0.7+ 1.0- 689/FS Apr. 12.16834 5 46 01.29 +14 03 30.6 0.8- 2.7+ 689/FS 1969 July 20.17741 18 06 06.95 - 9 32 38.6 ( 5.2- 2.4-) 821/AL Aug. 9.09861 17 56 59.60 -10 20 31.7 ( 6.3+ 0.5+) 821/AL 9.15972 17 56 58.63 -10 20 41.9 ( 8.5+ 0.9+) 821/AL 1970 Sept.29.07488 1 22 52.71 + 6 35 08.8 2.0- 0.5- 046/KL 29.09641 1 22 52.12 + 6 34 57.7 1.6- 0.5- 046/KL 29.94542 1 22 28.89 + 6 27 39.8 ( 3.3- 3.7-) 046/KL 29.96729 1 22 28.26 + 6 27 29.2 ( 3.1- 3.1-) 046/KL Oct. 22.59306 1 10 31.15 + 3 10 11.2 2.4+ 2.9- 370/sk Nov. 23.80396 1 02 17.71 + 0 20 03.0 1.2+ 0.8+ 046/KL 25.80638 1 02 30.08 + 0 16 38.0 2.1- 0.6- 046/KL 26.75714 1 02 38.43 + 0 15 19.3 2.9+ 0.9- 046/KL 26.85402 1 02 38.98 + 0 15 14.2 0.1- 1.4+ 046/KL 27.84264 1 02 49.00 + 0 14 05.6 ( 3.5+ 0.7+) 046/KL Dec. 19.72258 1 12 04.36 + 0 38 13.1 1.2+ 0.3+ 046/KL 1971 Jan. 18.78323 1 39 27.55 + 3 04 49.8 0.1- 0.4+ 046/KL 18.80406 1 39 28.90 + 3 04 57.3 0.8- 0.1+ 046/KL 24.79012 1 46 28.44 + 3 43 51.9 ( 2.3+ 6.1+) 046/KL 29.81034 1 52 39.06 + 4 17 54.4 ( 3.0+ 5.7+) 046/KL 1977 May 16.32269 21 13 03.27 - 5 09 53.8 ( 0.9- 3.8+) 801/HO - continued - Periodic Comet Whipple NK 457-3 Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1977 May 26.33462 21 18.78 - 4 18.6 ( 9.6- 2.8-) 821/AL X 26.37839 21 18.60 - 4 18.4 (10.4- 3.6-) 821/AL X July 11.17854 21 22 41.11 - 2 19 04.9 ( 3.9- 0.9-) 801/HO 12.74352 21 22 06.90 - 2 19 48.9 2.0- 2.8+ 323/PR Aug. 15.18586 21 02 37.56 - 4 11 45.1 1.4- 0.9+ 801/HO 21.72770 20 58 22.74 - 4 50 30.2 0.7- 1.8- 210/AA 21.73440 20 58 22.57 - 4 50 29.8 0.6+ 1.1+ 210/AA 21.74510 20 58 22.18 - 4 50 35.9 1.0+ 1.1- 210/AA 21.74780 20 58 21.95 - 4 50 35.2 0.8- 0.6+ 210/AA 21.77080 20 58 21.17 - 4 50 43.5 0.9+ 0.8+ 210/AA 21.79650 20 58 20.10 - 4 50 52.8 0.1- 1.0+ 210/AA 21.80760 20 58 19.76 - 4 50 56.9 1.2+ 1.0+ 210/AA 22.75380 20 57 44.65 - 4 56 51.9 1.5+ 2.1- 210/AA 22.77400 20 57 43.74 - 4 56 59.5 0.6- 2.2- 210/no 1978 Nov. 10.31850 6 14 47.15 +10 09 24.7 0.9- 0.7- 801/HO 29.34271 6 05 58.42 + 9 00 02.6 0.1+ 0.2+ 801/HO Dec. 28.21583 5 44 00.33 + 8 28 11.6 0.8+ 1.0- 801/HO ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1984 May 10

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