OAA computing section circular NK 481 Periodic Comet Comas-Sola 1969 VIII = 1978 XVII

The following improved orbital elements, by S. Nakano, are from 75 observations 1968 to 1979, including full planetary per- turbations and non-gravitational effect of style II. The mean residual is +/- 1.44 arc seconds. Epoch = 1978 Sept. 9.0 ET T = 1978 Sept.24.22737 +/- 0.00176 (m.e.) ET Peri. = 42.84044 +/- 0.00119 Node = 62.42493 +/- 0.00115 (1950.0) Inc. = 12.95770 +/- 0.00027 q = 1.8698650 +/- 0.0000059 AU e = 0.5658156 +/- 0.0000013 a = 4.3066147 +/- 0.0000048 AU nß = 0.11028084 +/- 0.000000003 P = 8.937 +/- 0.0000149 years A1 = +0.687 +/- 0.141 A2 = -0.15499 +/- 0.00826 T = 1969 Oct. 29.06548 ET Epoch = 1969 Oct. 26.0 ET Peri. = 40.06606 e = 0.5769263 Node = 62.75099 (1950.0) a = 4.1807521 AU Inc. = 13.44759 nß= 0.11529818 q = 1.7687664 AU P = 8.548 years The predicted orbit for the 1987 return is as follows: T = 1987 Aug. 18.67945 ET Epoch = 1987 Sept. 2.0 ET Peri. = 45.51896 e = 0.5698117 Node = 60.38082 (1950.0) a = 4.2545710 AU Inc. = 12.95246 nß= 0.11231051 q = 1.8302669 AU P = 8.776 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 ¡ , " " " 1968 10 27.20837 23 05 39.71 -22 48 06.7 1.5- 2.6- 693/CT 1969 09 09.90953 07 10 33.14 +25 27 12.0 0.8+ 1.1- 210/AA 1969 09 09.93653 07 10 37.27 +25 27 16.3 ( 4.4- 0.0 ) 210/gs 1969 09 11.92010 07 16 10.56 +25 30 37.4 1.7- 0.2- 210/AA 1969 09 12.87501 07 18 51.49 +25 32 11.0 ( 4.3+ 2.0+) 323/h5 1969 09 13.13201 07 19 34.28 +25 32 22.9 1.6- 3.0- 020/NI 1969 09 15.88125 07 27 16.99 +25 35 55.5 0.5+ 0.2+ 323/PR 1969 09 16.91038 07 30 10.16 +25 36 51.3 1.3- 0.4- 210/AA 1969 09 17.91266 07 32 58.56 +25 37 47.9 ( 6.4- 3.4+) 210/AA 1969 09 17.93783 07 33 03.36 +25 37 47.7 1.4+ 1.8+ 210/gs 1969 09 20.92846 07 41 26.85 +25 39 39.1 0.8- 0.0 210/AA 1969 09 20.94647 07 41 29.61 +25 39 37.9 ( 4.3- 1.8-) 210/gs 1969 09 21.92752 07 44 15.18 +25 40 04.3 0.6+ 1.7+ 210/cv 1969 09 21.94795 07 42 10.65 +25 39 53.9 ( 0.48- 0.00-) 210/cv 1969 10 04.09718 08 19 13.30 +25 38 01.9 ( 0.21+ 0.04+) 020/ml 1969 10 09.06645 08 32 02.10 +25 29 45.6 ( 3.2- 1.9-) 020/NI 1969 10 09.39723 08 32 55.8 +25 29 19 (15.6- 0.7-) 773/WN Y 1969 10 09.42170 08 32 59.5 +25 29 15 (19.9- 2.8-) 773/WN Y 1969 10 14.18051 08 46 03.01 +25 21 40.1 ( 1.5+ 10.7+) 020/ml 1969 11 04.01462 09 40 46.45 +24 33 46.2 2.2- 0.3- 020/NI - continued - NK 481 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1969 11 07.12792 09 48 31.15 +24 26 01.0 0.5- 1.3- 046/KL 1969 11 07.14181 09 48 33.03 +24 26 00.8 2.6- 0.5+ 046/KL 1969 11 15.12759 10 07 44.49 +24 07 22.8 0.8+ 1.6+ 020/NI 1969 11 15.13105 10 07 44.73 +24 07 19.3 2.5- 1.5- 020/NI 1969 11 15.77258 10 09 14.74 +24 06 00.8 1.0+ 1.8+ 370/sk 1969 11 15.78611 10 09 16.42 +24 05 59.5 1.5- 2.1+ 370/sk 1969 11 17.17263 10 12 28.60 +24 03 01.3 2.5- 1.3- 046/KL 1969 11 18.08892 10 14 34.96 +24 01 14.0 0.2+ 2.5+ 020/NI 1969 11 18.09239 10 14 35.39 +24 01 08.6 0.3- 2.5- 020/NI 1969 11 20.18458 10 19 19.52 +23 57 12.1 0.4+ 1.0+ 020/NI 1969 11 20.18461 10 19 19.53 +23 57 12.3 0.5+ 1.2+ 020/NI 1969 12 06.90799 10 53 56.27 +23 39 54.6 ( 8.6+ 0.3-) 210/gs 1969 12 06.95993 10 54 02.47 +23 39 56.4 (14.8+ 1.2+) 210/gs 1969 12 07.89835 10 55 46.96 +23 39 58.9 ( 9.7+ 1.2+) 210/gs 1969 12 07.91899 10 55 47.73 +23 40 01.2 (10.8- 3.2+) 210/gs 1969 12 09.13131 10 58 01.73 +23 40 14.9 0.1+ 1.4+ 020/NI 1969 12 09.13407 10 58 02.07 +23 40 13.1 0.7+ 0.5- 020/NI 1969 12 19.87674 11 15 54.19 +23 52 39.9 1.2- 0.3+ 370/sk 1969 12 20.81808 11 17 18.58 +23 54 39.2 0.1+ 0.6- 370/sk 1969 12 20.87118 11 17 23.37 +23 54 48.2 ( 3.3+ 1.3+) 370/sk 1970 01 03.76319 11 34 35.88 +24 42 51.2 1.6- 1.1- 370/sk 1970 01 04.95163 11 35 45.24 +24 48 34.9 2.9+ 2.2+ 046/mr 1970 01 07.03956 11 37 37.79 +24 59 12.8 1.3- 0.4+ 046/KL 1970 01 07.83090 11 38 18.31 +25 03 30.6 ( 7.8+ 2.3+) 370/sk 1970 01 08.65660 11 38 58.23 +25 08 00.8 2.4- 2.5+ 370/sk 1970 01 10.79271 11 40 33.80 +25 20 12.0 (10.0- 1.2+) 370/sk 1970 01 10.79896 11 40 34.01 +25 20 14.2 (10.5- 1.2+) 370/sk 1970 01 11.85625 11 41 18.19 +25 26 29.7 0.3- 0.5- 370/sk 1970 01 12.99762 11 42 02.38 +25 33 24.6 2.8- 1.1- 046/KL 1970 01 13.86771 11 42 33.41 +25 38 58.6 ( 0.9- 4.7+) 370/sk 1970 01 14.01838 11 42 38.80 +25 39 49.9 ( 4.5- 1.2+) 046/mr 1970 01 14.89935 11 43 08.69 +25 45 24.1 0.6- 0.2- 046/KL 1970 01 15.63681 11 43 31.45 +25 50 17.8 ( 6.8- 4.5+) 370/sk 1970 01 18.83160 11 44 55.1 +26 11 42 (13.1- 3.5+) 370/sk Y 1970 01 19.84479 11 45 16.84 +26 18 37.8 ( 8.5- 0.9-) 370/sk 1970 01 30.89670 11 46 22.82 +27 38 37.9 ( 6.5+ 18.6-) 210/AA 1970 02 01.98299 11 46 00.33 +27 54 14.9 1.1- 0.2+ 046/KL 1970 02 02.59426 11 45 51.58 +27 58 37.5 ( 6.9- 5.7-) 385/ut 1970 02 04.11152 11 45 26.96 +28 09 43.8 1.6+ 2.7+ 020/NI 1970 02 04.11913 11 45 26.79 +28 09 45.8 1.4+ 1.4+ 020/NI 1970 02 04.12259 11 45 26.70 +28 09 46.0 1.2+ 0.1+ 020/NI 1970 02 05.93740 11 44 50.92 +28 22 20.1 (14.8+ 18.8-) 210/AA 1970 02 06.14161 11 44 45.19 +28 24 04.6 0.3+ 0.0 020/NI 1970 02 06.92150 11 44 27.82 +28 29 15.3 (13.4+ 14.9-) 210/AA 1970 02 06.92307 11 44 27.11 +28 29 28.1 0.4- 1.0- 046/KL 1970 02 07.95930 11 44 01.53 +28 36 20.7 (18.6+ 15.7-) 210/AA 1970 02 08.93470 11 43 34.52 +28 42 55.8 (18.6+ 14.1-) 210/gs 1970 02 10.69375 11 42 39.73 +28 54 49.1 0.5- 2.4+ 323/PR 1970 02 12.96270 11 41 22.86 +29 08 27.2 (21.3+ 13.3-) 210/AA 1970 03 01.85823 11 28 00.10 +30 14 14.1 2.1- 2.1+ 210/AA - continued - NK 481 - 3 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1970 03 03.82235 11 26 14.07 +30 16 21.0 ( 2.2+ 3.4+) 210/gs 1970 03 05.84258 11 24 24.29 +30 17 09.9 ( 1.4+ 4.2+) 210/gs 1970 03 07.80624 11 22 38.26 +30 16 30.7 ( 4.7- 0.2-) 046/mr 1970 03 09.91451 11 20 46.28 +30 14 27.4 1.1+ 1.3- 046/KL 1970 03 10.83451 11 19 57.98 +30 13 03.9 1.3- 2.0- 046/mr 1970 03 29.84547 11 06 37.83 +28 45 53.5 1.9+ 1.3- 046/KL 1970 03 30.81968 11 06 10.31 +28 38 47.4 1.7+ 2.1- 046/mr 1970 04 01.83229 11 05 18.30 +28 23 31.6 2.9+ 0.2+ 046/KL 1970 04 03.82166 11 04 33.28 +28 07 31.7 1.9+ 2.0- 046/pt 1970 04 05.84021 11 03 54.19 +27 50 34.3 0.0 0.3- 046/KL 1970 04 08.90626 11 03 07.85 +27 23 26.2 ( 2.4- 4.2+) 046/pt 1970 04 10.83581 11 02 47.09 +27 05 27.6 2.2- 0.7+ 046/KL 1977 09 11.23583 00 28 56.38 -14 36 20.4 ( 4.5- 4.2-) 801/HO 1977 09 12.22506 00 28 16.91 -14 41 17.0 ( 2.4- 3.8-) 801/HO 1977 10 11.16567 00 06 02.16 -16 28 24.1 1.2+ 0.5+ 801/HO 1977 11 15.05214 23 47 21.46 -15 45 29.7 0.3+ 2.7- 801/HO 1978 11 08.81458 10 48 08.72 +19 38 06.6 ( 4.9- 1.2+) 372/sk 1978 12 03.81111 11 37 37.53 +17 09 52.3 0.4+ 1.0- 323/PR 1978 12 07.42458 11 43 50.57 +16 53 36.6 2.6+ 0.3+ 801/HO 1978 12 30.72188 12 17 00.07 +15 55 12.3 0.2+ 0.8+ 879/fr 1978 12 30.72951 12 17 00.57 +15 55 16.2 ( 0.1+ 4.9+) 879/fr 1979 01 05.33844 12 22 55.87 +15 54 41.8 0.6+ 1.1- 801/HO 1979 01 23.39174 12 35 32.26 +16 30 25.5 0.9+ 2.1+ 801/HO 1979 01 24.73480 12 36 03.02 +16 35 11.2 1.3- 0.2+ 381/ks 1979 02 01.82708 12 37 48.92 +17 09 14.9 2.3+ 1.1- 323/PR 1979 02 21.72917 12 32 43.69 +18 53 01.8 2.1- 1.5+ 323/PR 1979 02 26.98552 12 29 24.83 +19 19 13.0 0.3+ 0.9- 046/KL 1979 02 26.99976 12 29 24.18 +19 19 18.0 0.2- 0.0 046/KL 1979 02 27.87773 12 28 47.40 +19 23 24.1 2.2+ 1.7- 046/KL 1979 02 27.89197 12 28 46.70 +19 23 30.7 1.1+ 0.8+ 046/KL 1979 03 01.34589 12 27 42.70 +19 30 11.3 1.2+ 1.4+ 801/HO 1979 03 02.90854 12 26 31.64 +19 36 58.3 1.8- 0.8- 046/KL 1979 03 02.92318 12 26 31.13 +19 37 02.5 0.8+ 0.4- 046/KL 1979 03 03.70139 12 25 54.53 +19 40 29.4 0.1- 2.3+ 323/PR 1979 03 04.00510 12 25 39.86 +19 41 34.0 ( 3.1- 0.5-) 046/KL 1979 03 04.01969 12 25 39.16 +19 41 37.3 2.8- 0.8- 046/KL 1979 03 19.86833 12 11 49.70 +20 22 35.3 0.4+ 1.0- 046/KL 1979 03 19.88274 12 11 48.83 +20 22 37.3 0.6- 0.2+ 046/KL 1979 03 22.64878 12 09 20.18 +20 24 15.4 ( 0.3+ 3.2+) 323/PR 1979 03 22.85729 12 09 09.10 +20 24 07.0 0.6- 0.3+ 046/KL 1979 03 22.87535 12 09 08.31 +20 24 06.9 2.1+ 0.1- 046/KL 1979 03 24.87418 12 07 22.65 +20 23 54.5 0.8+ 0.1- 046/KL 1979 03 24.88876 12 07 21.63 +20 23 53.6 2.5- 0.7- 046/KL 1979 03 27.22532 12 05 21.20 +20 22 27.2 ( 3.8+ 1.5+) 801/HO 1979 04 22.25677 11 49 18.79 +18 43 08.6 ( 3.6+ 2.6+) 801/HO 1979 04 22.90428 11 49 06.02 +18 39 01.1 1.8- 1.1+ 046/KL 1979 04 22.91973 11 49 05.78 +18 38 53.8 0.7- 0.3- 046/KL 1979 04 26.51424 11 48 07.95 +18 15 07.9 ( 6.7+ 1.0+) 323/PR ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1985 December 16

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