OAA computing section circular NK 544 Periodic Comet Schwassmann-Wachmann 2
The following improved orbital elements, by S. Nakano, are from 99 observations 1973 to 1989, including full planetary per- turbations and non-gravitational effect of style II. The comet will pass 0.25 AU from Jupiter in 1997 March. The mean residual is +/- 1.04 arc seconds. Epoch = 1994 Jan. 8.0 ET T = 1994 Jan. 23.90914 +/- 0.00142 (m.e.) ET Peri. = 358.14236 +/- 0.00060 Node = 125.62370 +/- 0.00057 (1950.0) Inc. = 3.75727 +/- 0.00002 q = 2.0702659 +/- 0.0000009 AU e = 0.3987452 +/- 0.0000003 a = 3.4432420 +/- 0.0000005 AU nß = 0.15425980 +/- 0.00000003 P = 6.389 +/- 0.0000014 years A1 = +1.314 +/- 0.048 A2 = -0.30951 +/- 0.00266 T = 1974 Sept.12.33604 ET Epoch = 1974 Sept.30.0 ET Peri. = 357.30801 e = 0.3855315 Node = 125.97202 (1950.0) a = 3.4862279 AU Inc. = 3.72707 nß= 0.15141552 q = 2.1421772 AU P = 6.509 years T = 1981 Mar. 17.03891 ET Epoch = 1981 Mar. 17.0 ET Peri. = 357.45822 e = 0.3867038 Node = 125.94351 (1950.0) a = 3.4812183 AU Inc. = 3.72977 nß= 0.15174248 q = 2.1350180 AU P = 6.495 years T = 1987 Aug. 30.47040 ET Epoch = 1987 Sept. 2.0 ET Peri. = 357.88678 e = 0.3984140 Node = 125.66232 (1950.0) a = 3.4433191 AU Inc. = 3.75573 nß= 0.15425462 q = 2.0714525 AU P = 6.389 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 ¡ , " " " 1973 08 28.08056 02 24 21.48 +09 40 51.9 0.3+ 0.6+ 056/SP 1973 08 28.10556 02 24 21.63 +09 40 51.5 1.2- 1.2+ 056/SP 1973 08 29.31319 02 24 34.18 +09 39 59.5 0.6- 1.1+ 801/HO 1973 09 04.39236 02 25 11.18 +09 33 20.7 0.6+ 0.0 693/CT 1973 09 04.43611 02 25 11.24 +09 33 17.6 0.7+ 0.5+ 693/CT 1973 09 21.34016 02 22 55.30 +08 55 11.4 1.8+ 0.8+ 691/ST 1973 09 21.37112 02 22 54.69 +08 55 05.8 1.9+ 0.9+ 691/ST 1973 09 26.20755 02 21 09.54 +08 39 07.4 1.0- 1.7+ 801/HO 1973 09 27.72708 02 20 30.5 +08 33 38 1.6- 2.0- 380/kj Y 1973 09 27.75139 02 20 29.8 +08 33 36 1.9- 1.3+ 380/kj Y - continued - P/Schwassmann-Wachmann 2 NK 544 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1973 09 28.95961 02 19 56.98 +08 29 06.9 ( 3.1- 0.5+) 046/KL 1973 09 28.98096 02 19 56.43 +08 29 03.8 2.1- 2.2+ 046/KL 1973 10 06.19063 02 16 06.34 +08 00 13.9 0.5- 0.8+ 801/HO 1973 10 21.32263 02 05 33.00 +06 51 49.4 1.0+ 0.3+ 691/ST 1973 10 21.32992 02 05 32.65 +06 51 47.3 1.0+ 0.2+ 691/ST 1973 10 24.20569 02 03 17.20 +06 38 24.6 0.5- 1.0- 774/WN 1973 10 24.22583 02 03 16.23 +06 38 20.4 0.3- 0.4+ 774/WN 1973 10 25.64444 02 02 08.37 +06 31 48.2 ( 3.0- 0.6-) 372/sk 1973 10 25.66389 02 02 07.40 +06 31 43.6 ( 3.2- 0.2+) 372/sk 1973 11 24.53626 01 40 50.06 +04 48 29.6 1.2+ 0.4+ 879/fr 1973 11 24.55174 01 40 49.42 +04 48 27.2 0.9- 0.4- 879/fr 1975 01 12.59865 12 44 24.50 -01 37 29.9 ( 3.2- 1.9+) 485/CA 1975 01 13.25380 12 44 58.51 -01 39 32.9 0.0 0.6+ 805/EL 1975 01 14.25860 12 45 49.04 -01 42 30.7 1.8- 0.5+ 805/EL 1975 01 17.75069 12 48 34.07 -01 51 36.8 ( 3.7- 0.1-) 372/sk 1975 01 23.77986 12 52 38.32 -02 02 20.1 2.4- 0.2+ 372/sk 1975 03 18.52513 12 46 47.72 +00 40 02.6 ( 3.3- 1.6+) 485/CA 1975 03 21.73681 12 44 30.77 +00 58 31.5 0.9+ 1.9- 372/sk 1975 04 11.31181 12 29 38.39 +02 43 32.8 0.4+ 1.5- 774/WN 1975 04 12.55396 12 28 50.70 +02 48 29.3 ( 1.5+ 3.2+) 330/TS 1975 04 15.18414 12 27 12.89 +02 58 01.7 0.4- 0.6- 805/EL 1975 04 18.10537 12 25 32.56 +03 07 13.2 0.7+ 0.1+ 801/HO 1975 04 18.12493 12 25 31.76 +03 07 24.6 1.2- 1.7+ 805/EL 1975 04 18.40000 12 25 22.84 +03 08 10.9 0.9- 0.8- 485/CA 1975 04 29.14348 12 20 39.34 +03 29 31.1 1.7+ 1.2+ 801/HO 1975 05 08.07838 12 18 34.28 +03 32 31.5 0.6- 0.3- 805/EL 1975 05 09.26597 12 18 25.66 +03 31 51.5 1.6+ 1.4+ 693/CT 1975 05 09.31597 12 18 25.27 +03 31 49.8 1.6+ 1.5+ 693/CT 1975 06 04.22668 12 22 46.30 +02 27 06.8 ( 3.5+ 1.4+) 691/ST 1975 06 04.24983 12 22 46.88 +02 27 00.7 ( 3.8+ 1.0+) 691/ST 1975 06 11.09775 12 26 03.28 +01 56 13.9 0.0 0.9+ 801/HO 1979 12 14.98141 23 39 07.87 -06 03 01.2 ( 2.6- 3.3-) 801/HO 1979 12 15.99677 23 39 34.00 -05 59 25.7 1.6+ 0.1- 801/HO 1980 11 09.36183 06 34 18.65 +19 09 17.8 1.1- 0.0 801/HO 1980 12 05.36524 06 31 39.50 +19 14 48.8 1.2- 0.3+ 801/HO 1980 12 05.55068 06 31 34.37 +19 15 09.9 1.5- 0.6+ 474/JN 1980 12 05.57344 06 31 33.71 +19 15 11.4 0.7- 0.6+ 474/JN 1980 12 11.31442 06 28 20.3 +19 22 28 ( 8.9- 1.9+) 711/MC Y 1980 12 29.46398 06 14 37.62 +19 58 21.3 0.1+ 0.6- 386/YT 1980 12 29.47998 06 14 36.82 +19 58 24.8 0.2+ 0.5+ 386/YT 1980 12 29.49144 06 14 36.23 +19 58 26.3 0.1+ 0.2+ 386/YT 1980 12 31.49722 06 12 58.44 +20 03 18.1 1.0+ 0.6- 386/YT 1980 12 31.50856 06 12 57.84 +20 03 19.2 0.6+ 1.2- 386/YT 1981 01 03.73854 06 10 22.47 +20 11 22.4 ( 1.7- 4.2-) 386/YT 1981 01 05.67778 06 08 52.56 +20 16 26.2 1.3- 1.2- 386/YT 1981 01 08.51777 06 06 46.67 +20 23 57.2 1.1+ 0.4+ 386/YT 1981 01 08.52951 06 06 46.12 +20 23 59.7 0.9+ 0.9+ 386/YT 1981 01 09.54057 06 06 02.98 +20 26 41.2 1.1+ 0.1+ 386/YT 1981 01 09.55174 06 06 02.44 +20 26 41.2 0.5+ 1.7- 386/YT 1981 01 11.15648 06 04 56.35 +20 31 02.4 0.9+ 0.4+ 801/HO - continued - P/Schwassmann-Wachmann 2 NK 544 - 3 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1981 01 26.27432 05 57 43.48 +21 13 14.3 0.9- 0.3+ 675/PL 1981 02 28.05851 06 07 59.93 +22 38 27.0 0.2+ 0.1- 801/HO 1982 05 15.29305 15 25 56.17 -13 30 36.8 0.3+ 0.6+ 675/PL 1982 05 16.33819 15 25 05.91 -13 27 56.4 ( 3.5- 0.3-) 675/PL 1982 05 16.37292 15 25 04.18 -13 27 49.8 ( 3.9- 0.9+) 675/PL 1982 05 17.30764 15 24 20.01 -13 25 29.2 0.7- 0.5- 675/PL 1982 05 18.36597 15 23 29.82 -13 22 48.9 0.9- 1.3+ 675/PL 1986 06 26.45597 01 43 45.18 +07 20 51.4 0.1- 0.0 675/PL 1986 06 26.47181 01 43 46.07 +07 20 54.8 0.2- 0.9- 675/PL 1986 06 27.45764 01 44 41.90 +07 25 17.5 0.6- 0.6- 675/PL 1986 06 27.46931 01 44 42.54 +07 25 20.5 0.8- 0.7- 675/PL 1986 10 25.16619 02 02 29.79 +06 27 19.1 0.2+ 0.7- 691/ST 1986 10 25.17863 02 02 29.11 +06 27 15.6 0.8- 0.7- 691/ST 1986 10 25.18541 02 02 28.79 +06 27 13.7 0.5- 0.7- 691/ST 1986 10 30.24490 01 58 21.22 +06 03 49.3 1.1- 0.6- 691/ST 1986 10 30.25539 01 58 20.71 +06 03 46.4 0.8- 0.7- 691/ST 1986 10 30.26591 01 58 20.17 +06 03 43.8 0.9- 0.5- 691/ST 1986 11 26.63875 01 39 12.97 +04 35 31.5 0.5- 2.2+ 399/ue 1986 11 29.45729 01 37 56.19 +04 32 02.4 ( 0.5- 2.6+) 399/ue 1986 11 29.47639 01 37 55.57 +04 32 00.5 2.1- 1.9+ 399/ue 1986 12 04.23003 01 36 10.30 +04 28 57.9 0.3- 0.6- 691/ST 1986 12 04.23985 01 36 10.12 +04 28 57.4 0.1- 0.9- 691/ST 1986 12 06.58542 01 35 30.08 +04 28 50.4 1.2+ 0.8+ 399/ue 1986 12 06.60023 01 35 29.90 +04 28 51.2 2.1+ 1.5+ 399/ue 1986 12 22.45475 01 34 34.10 +04 51 01.1 ( 1.9+ 3.1+) 399/ue 1986 12 22.47153 01 34 34.17 +04 51 02.6 1.2+ 1.9+ 399/ue 1987 01 01.47049 01 37 11.0 +05 24 19 1.5+ 2.4+ 398/k2 Y 1987 01 30.44155 01 57 18.3 +08 06 38 0.3- 0.7- 897/kj Y 1987 04 01.11910 03 23 47.16 +16 04 26.3 0.8+ 0.2- 707/ev 1987 04 03.12014 03 27 24.63 +16 19 49.4 0.2+ 1.3- 707/ev 1987 12 25.79236 12 49 53.31 -02 35 28.6 2.4- 0.3- 897/kj 1987 12 25.85243 12 49 58.23 -02 35 52.9 0.0 1.2- 897/kj 1988 01 20.77222 13 18 52.62 -04 38 47.3 ( 4.4- 1.6+) 897/kj 1988 01 20.81116 13 18 54.71 -04 38 54.9 2.2- 0.6+ 897/kj 1988 01 21.45517 13 19 27.71 -04 40 42.0 0.4- 0.7+ 691/ST 1988 01 21.47021 13 19 28.46 -04 40 44.7 0.2- 0.4+ 691/ST 1988 02 23.80902 13 33 17.16 -04 40 22.7 (10.2- 13.2+) 892/YM 1988 02 24.80902 13 33 17.16 -04 40 22.7 ( .01+ .04-) 892/YM 1988 03 12.70729 13 28 08.46 -03 30 14.8 0.9- 1.9+ 897/kj 1988 03 12.74513 13 28 07.29 -03 30 04.4 0.1- 1.0+ 897/kj 1988 03 17.62917 13 25 23.16 -03 05 01.9 ( 3.3+ 0.2-) 400/KM 1988 03 17.64792 13 25 22.46 -03 04 57.7 ( 3.5+ 2.0-) 400/KM 1988 03 17.66597 13 25 21.72 -03 04 51.1 ( 2.8+ 1.1-) 400/KM 1988 03 18.28626 13 24 58.68 -03 01 27.1 1.3+ 1.6- 807/CE 1988 03 18.30189 13 24 58.03 -03 01 19.6 0.8+ 0.9+ 807/CE 1988 03 18.31751 13 24 57.43 -03 01 13.5 1.0+ 2.0+ 807/CE 1988 03 19.16388 13 24 25.78 -02 56 41.4 0.6+ 2.0+ 807/CE 1988 03 20.20080 13 23 45.62 -02 51 05.9 0.5+ 1.5+ 807/CE 1988 03 22.25897 13 22 23.06 -02 39 49.9 ( 1.6+ 3.5+) 807/CE 1988 04 08.33368 13 09 32.29 -01 08 08.2 0.9+ 0.4- 675/PL - continued - P/Schwassmann-Wachmann 2 NK 544 - 4 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1988 04 10.43247 13 07 55.29 -00 57 55.3 0.9+ 0.2- 675/PL 1988 04 10.60208 13 07 47.71 -00 57 06.1 0.7+ 0.8+ 897/kj 1988 04 10.64097 13 07 45.89 -00 56 55.1 1.2+ 0.7+ 897/kj 1988 04 13.95330 13 05 16.52 -00 41 47.9 1.2+ 0.8- 503/CX 1988 04 15.52708 13 04 07.28 -00 35 02.1 1.2- 2.4- 897/kj 1988 04 15.56910 13 04 05.45 -00 34 49.3 0.1- 0.2- 897/kj 1988 05 19.46403 12 49 13.10 +00 21 14.9 ( 3.3+ 5.4-) 568/MK 1989 06 02.37840 17 37 05.54 -19 52 42.5 0.7+ 0.3+ 568/MK 1989 06 02.38117 17 37 05.40 -19 52 42.2 0.5+ 0.6+ 568/MK 1989 08 02.31576 17 01 05.24 -19 57 20.1 0.2- 0.3- 568/MK 1989 08 02.33024 17 01 05.05 -19 57 20.5 0.3- 0.1- 568/MK 1989 08 02.37983 17 01 04.41 -19 57 22.4 0.3- 0.2- 568/MK 1989 08 02.38723 17 01 04.34 -19 57 23.2 0.0 0.7- 568/MK ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1990 May 20