OAA computing section circular NK 546 Periodic Comet Swift-Gehrels
The following improved orbital elements, by S. Nakano, are from 64 observations 1889 to 1991, including full planetary pertubations and non-gravitational effect of style II. The mean residual is +/- 1.69 arc seconds. Epoch = 1991 Mar. 5.0 ET T = 1991 Feb. 22.72484 +/- 0.00057 (m.e.) ET Peri. = 84.84256 +/- 0.00039 Node = 313.71771 +/- 0.00032 (1950.0) Inc. = 9.25003 +/- 0.00005 q = 1.3551336 +/- 0.0000017 AU e = 0.6916005 +/- 0.0000004 a = 4.3940850 +/- 0.0000005 AU nß = 0.10700434 +/- 0.00000002 P = 9.211 +/- 0.0000016 years A1 = +0.562 +/- 0.019 A2 = +0.02119 +/- 0.00006 A3 = -0.02216 +/- 0.00216 T = 1889 Nov. 30.11012 ET Epoch = 1889 Nov. 14.0 ET Peri. = 69.81947 e = 0.6896560 Node = 331.16901 (1950.0) a = 4.3748895 AU Inc. = 10.29923 nß= 0.10770936 q = 1.3577207 AU P = 9.151 years (T = 1899 Feb. 1.94929 ET Epoch = 1899 Jan. 26.0 ET Peri. = 70.32315 e = 0.6900512 Node = 330.63897 (1950.0) a = 4.3839432 AU Inc. = 10.26145 nß= 0.10737587 q = 1.3587978 AU P = 9.179 years ) (T = 1908 Mar. 30.38021 ET Epoch = 1908 Apr. 9.0 ET Peri. = 70.42984 e = 0.6912247 Node = 330.50326 (1950.0) a = 4.3668948 AU Inc. = 10.26898 nß= 0.10800528 q = 1.3483892 AU P = 9.126 years ) (T = 1917 May 9.01280 ET Epoch = 1917 May 12.0 ET Peri. = 76.94895 e = 0.6945168 Node = 323.36160 (1950.0) a = 4.3665132 AU Inc. = 8.95960 nß= 0.10801944 q = 1.3338963 AU P = 9.124 years ) (T = 1926 June 9.68929 ET Epoch = 1926 June 14.0 ET Peri. = 82.06524 e = 0.6914295 Node = 316.99025 (1950.0) a = 4.4003303 AU Inc. = 9.29931 nß= 0.10677662 q = 1.3578123 AU P = 9.231 years ) (T = 1935 Sept.13.71604 ET Epoch = 1935 Aug. 26.0 ET Peri. = 82.20846 e = 0.6902664 Node = 316.85397 (1950.0) a = 4.4190572 AU Inc. = 9.28437 nß= 0.10609860 q = 1.3687305 AU P = 9.290 years ) - continued - P/Swift-Gehrels NK 546 - 2 (T = 1944 Dec. 24.85504 ET Epoch = 1944 Dec. 16.0 ET Peri. = 82.37704 e = 0.6907047 Node = 316.61259 (1950.0) a = 4.4124034 AU Inc. = 9.28536 nß= 0.10633868 q = 1.3647358 AU P = 9.269 years ) (T = 1954 Apr. 3.48968 ET Epoch = 1954 Apr. 8.0 ET Peri. = 82.88071 e = 0.6910206 Node = 316.33065 (1950.0) a = 4.4064913 AU Inc. = 9.25903 nß= 0.10655276 q = 1.3615151 AU P = 9.250 years ) (T = 1963 May 31.41425 ET Epoch = 1963 June 20.0 ET Peri. = 83.55433 e = 0.6915678 Node = 314.75181 (1950.0) a = 4.4027160 AU Inc. = 9.21678 nß= 0.10668984 q = 1.3579393 AU P = 9.238 years ) T = 1972 Aug. 31.04216 ET Epoch = 1972 Aug. 31.0 ET Peri. = 84.40659 e = 0.6920884 Node = 314.23119 (1950.0) a = 4.3981394 AU Inc. = 9.25520 nß= 0.10685641 q = 1.3542380 AU P = 9.224 years T = 1981 Nov. 27.45182 ET Epoch = 1981 Nov. 12.0 ET Peri. = 84.53298 e = 0.6913149 Node = 314.03133 (1950.0) a = 4.4091591 AU Inc. = 9.24411 nß= 0.10645607 q = 1.3610415 AU P = 9.258 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 ¡ , " " " 1889 11 14.00000 22 37 34.50 +11 01 36.0 ( 4.7- 1.0+) 500/NO 1889 11 19.81894 22 49 20.45 +12 41 32.4 ( 8.7- 1.5+) 020/NI 1889 11 20.71985 22 51 19.07 +12 57 08.9 ( 6.4- 2.7-) 546/OP 1889 11 20.79911 22 51 29.73 +12 58 35.9 1.0- 0.5+ 020/NI 1889 11 22.12434 22 54 27.87 +13 21 42.6 ( 5.3- 4.1-) 662/LI 1889 11 22.81748 22 56 02.95 +13 33 53.1 4.3- 1.4- 020/NI 1889 11 22.82767 22 56 04.64 +13 34 06.4 0.1- 3.2+ 526/K1 1889 11 22.83235 22 56 05.27 +13 34 08.6 0.6+ 0.0 040/LM 1889 11 22.86292 22 56 09.28 +13 34 42.3 0.8- 1.3+ 546/OP 1889 11 23.16544 22 56 51.25 +13 39 58.5 4.6- 3.9- 662/LI 1889 11 23.74154 22 58 12.56 +13 50 05.8 1.2+ 1.7- 040/LM 1889 11 26.79600 23 05 35.12 +14 44 04.9 1.0- 1.6+ 020/NI 1889 11 27.16319 23 06 30.22 +14 50 30.2 2.6+ 4.4- 662/LI 1889 12 13.76176 23 53 22.20 +19 41 54.7 ( 6.7+ 2.7+) 020/NI 1889 12 16.23181 00 01 08.28 +20 23 28.4 ( 6.0+ 3.9-) 662/LI 1889 12 21.80790 00 19 19.22 +21 54 32.8 ( 7.4+ 1.0+) 020/NI 1889 12 23.06944 00 23 31.98 +22 14 20.9 ( 2.1+ 5.3-) 795/RU 1889 12 24.04875 00 26 50.10 +22 29 40.5 1.2+ 1.4- 795/RU 1889 12 24.06306 00 26 52.83 +22 29 52.6 0.6- 2.5- 795/RU 1889 12 24.06306 00 26 53.16 +22 29 52.2 4.0+ 2.9- 795/RU - continued - P/Swift-Gehrels NK 546 - 3 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1889 12 24.89192 00 29 41.82 +22 42 36.6 ( 4.8+ 4.0-) 004/TO 1890 01 11.20145 01 30 49.67 +26 34 37.3 1.1+ 4.1- 662/LI 1890 01 16.90073 01 51 27.94 +27 34 05.6 3.5+ 0.3- 546/OP 1973 02 08.29308 08 07 28.31 +22 04 23.2 0.8- 0.9- 675/PL 1973 02 09.29759 08 06 38.93 +22 01 19.8 2.0- 0.4+ 675/PL 1973 02 10.18046 08 05 57.25 +21 58 36.9 2.4- 2.5+ 801/HO 1973 02 10.23049 08 05 55.04 +21 58 26.6 0.4+ 1.8+ 801/HO 1973 02 25.06012 07 58 15.23 +21 09 38.1 0.6+ 0.3- 801/HO 1973 02 25.10506 07 58 14.28 +21 09 31.8 1.4- 2.6+ 801/HO 1973 02 28.19132 07 57 34.21 +20 58 48.0 ( 0.8+ 4.3-) 801/HO 1973 03 01.13459 07 57 25.73 +20 55 37.2 1.2+ 0.6+ 801/HO 1973 03 26.18993 08 02 42.04 +19 24 55.8 0.1+ 0.9- 691/ST 1973 03 26.23895 08 02 43.50 +19 24 44.6 0.6+ 0.8- 691/ST 1981 07 11.28627 22 40 08.05 -07 38 49.3 ( 1.1- 6.1+) 801/HO 1981 07 31.26675 22 43 50.46 -04 41 57.5 2.2+ 2.1+ 801/HO 1981 08 01.23275 22 43 44.48 -04 33 17.4 1.3+ 0.4+ 801/HO 1981 08 02.28005 22 43 35.89 -04 23 51.7 0.6+ 0.4- 801/HO 1981 08 05.70052 22 42 54.62 -03 52 47.0 ( 0.4+ 5.7+) 372/sk 1981 08 24.94757 22 32 35.88 -00 55 21.1 1.4+ 1.8+ 046/KL 1981 08 24.96169 22 32 35.12 -00 55 13.2 0.8+ 1.8+ 046/KL 1981 08 26.19737 22 31 35.06 -00 43 42.8 2.1+ 0.2- 801/HO 1981 08 28.93497 22 29 15.13 -00 18 13.8 2.0+ 2.7- 046/KL 1981 08 28.94914 22 29 14.31 -00 18 04.6 1.6+ 1.5- 046/KL 1981 09 01.54107 22 25 59.61 +00 15 27.3 ( 6.2+ 1.5-) 381/ks 1981 09 06.90943 22 20 52.41 +01 05 27.1 1.5+ 1.9+ 046/KL 1981 09 06.92378 22 20 51.39 +01 05 32.5 0.5- 0.7- 046/KL 1981 09 21.79773 22 07 28.32 +03 22 46.2 0.7- 0.7- 046/KL 1981 09 25.20950 22 05 03.25 +03 53 57.4 0.8- 0.9+ 801/HO 1981 09 29.99500 22 02 24.74 +04 37 36.8 0.8- 1.6+ 491/CN 1981 09 30.86552 22 02 03.01 +04 45 31.2 2.2+ 1.5- 491/CN 1981 10 28.83547 22 11 56.17 +09 19 58.1 2.2- 0.9- 491/CN 1981 10 29.75062 22 13 02.52 +09 30 00.7 ( 0.4- 2.9+) 020/NI 1981 10 29.94390 22 13 16.01 +09 32 04.5 2.2- 0.9- 491/CN 1981 11 02.95466 22 18 43.71 +10 16 59.3 1.6- 0.9- 801/HO 1981 11 05.22014 22 22 12.27 +10 43 08.5 2.1- 0.1- 707/ev 1981 11 15.07535 22 40 39.95 +12 43 00.5 0.4- 0.8- 707/ev 1981 11 15.7413 22 42 11.09 +12 51 55.3 (77.2+ 30.2+) 504/mm 1981 11 15.7525 22 42 12.30 +12 52 05.4 (74.3+ 31.8+) 504/mm 1981 11 23.00532 22 59 04.22 +14 25 24.3 1.1- 2.5+ 801/HO 1981 11 25.83069 23 06 19.95 +15 02 44.7 1.3+ 1.2+ 491/CN 1981 11 26.74236 23 08 44.97 +15 14 49.8 1.5- 0.4- 552/SV 1981 11 26.74583 23 08 45.68 +15 14 50.3 0.9+ 2.7- 552/SV 1981 11 26.77500 23 08 50.09 +15 15 16.3 1.2- 0.0 552/SV 1981 11 26.83593 23 08 59.76 +15 16 05.9 1.3- 0.3+ 491/CN 1981 11 27.82813 23 11 40.17 +15 29 17.9 2.1- 0.8+ 489/HF 1981 11 27.83854 23 11 41.80 +15 29 26.2 2.6- 0.8+ 489/HF 1981 11 28.7729 23 14 15.48 +15 41 54.3 1.1- 0.3- 494/mn 1981 11 28.7899 23 14 18.21 +15 42 06.9 1.4- 1.3- 494/mn 1981 12 01.75435 23 22 39.02 +16 21 56.1 ( 4.1+ 3.3+) 020/NI 1981 12 17.92882 00 13 14.56 +19 54 09.4 0.7+ 1.4+ 489/HF - continued - P/Swift-Gehrels NK 546 - 4 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs h m s ¡ , " " " 1981 12 17.93576 00 13 15.90 +19 54 14.3 0.1+ 1.2+ 489/HF 1981 12 19.94704 00 20 01.63 +20 19 12.2 ( 6.5- 1.1+) 801/HO 1981 12 22.7538 00 29 36.14 +20 53 06.1 ( 5.3+ 1.7+) 494/mn 1981 12 22.76562 00 29 38.49 +20 53 17.6 ( 4.9+ 4.8+) 489/HF 1981 12 22.77326 00 29 39.72 +20 53 19.1 0.4+ 0.8+ 489/HF 1981 12 22.7785 00 29 40.87 +20 53 21.5 1.4+ 0.5- 494/mn 1981 12 31.86875 01 01 23.82 +22 35 05.9 0.9+ 0.3+ 489/HF 1982 01 17.46944 02 00 14.04 +25 01 35.0 1.8+ 0.2- 887/nj 1982 01 20.05162 02 09 17.42 +25 19 19.2 2.3+ 1.3+ 801/HO 1982 01 25.82203 02 29 18.69 +25 54 04.3 2.9+ 0.8+ 491/CN 1982 01 26.82069 02 32 44.60 +25 59 27.1 ( 5.0+ 2.8+) 491/CN 1991 01 07.39167 22 12 00.12 -05 30 29.5 0.8- 2.2- 372/sk 1991 01 07.41500 22 12 03.56 -05 30 02.4 ( 5.5- 0.0 ) 372/sk 1991 01 12.40747 22 25 42.59 -03 59 01.4 2.5- 0.6+ 372/sk 1991 01 13.38924 22 28 26.18 -03 40 44.4 ( 0.7- 4.0-) 372/sk 1991 01 13.39896 22 28 27.58 -03 40 30.7 ( 3.9- 1.2-) 372/sk 1991 01 13.41042 22 28 29.68 -03 40 17.5 0.9- 1.0- 372/sk 1991 01 13.42326 22 28 31.79 -03 40 02.5 1.3- 0.4- 372/sk ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1991 January 15