OAA computing section circular NK 535 Periodic Comet Holmes
The following improved orbital elements, by S. Nakano, are from 50 observations 1964 to 1986, including full planetary perturbations and non-gravitational effect of style II. The mean residual is +/- 0.92 arc second. Epoch = 1986 Mar. 31.0 ET T = 1986 Mar. 14.13430 +/- 0.00145 (m.e.) ET Peri. = 23.33916 +/- 0.00042 Node = 327.34250 +/- 0.00014 (1950.0) Inc. = 19.18513 +/- 0.00004 q = 2.1684563 +/- 0.0000021 AU e = 0.4118157 +/- 0.0000006 a = 3.6866953 +/- 0.0000013 AU nß = 0.13923493 +/- 0.00000007 P = 7.079 +/- 0.0000036 years A1 = +0.091 +/- 0.070 A2 = +0.03379 +/- 0.00524 T = 1964 Nov. 15.92721 ET Epoch = 1964 Nov. 21.0 ET Peri. = 21.80081 e = 0.3788957 Node = 329.55442 (1950.0) a = 3.7786756 AU Inc. = 19.51795 nß= 0.13418212 q = 2.3469517 AU P = 7.345 years T = 1972 Jan. 30.81890 ET Epoch = 1972 Feb. 13.0 ET Peri. = 23.43568 e = 0.4136384 Node = 327.46137 (1950.0) a = 3.6754892 AU Inc. = 19.21811 nß= 0.13987218 q = 2.1551659 AU P = 7.046 years T = 1979 Feb. 22.66059 ET Epoch = 1979 Feb. 16.0 ET Peri. = 23.59976 e = 0.4131169 Node = 327.38028 (1950.0) a = 3.6804586 AU Inc. = 19.20463 nß= 0.13958899 q = 2.1599988 AU P = 7.061 years The predicted orbit for the 1993 return is as follows: T = 1993 Apr. 10.74671 ET Epoch = 1993 Apr. 3.0 ET Peri. = 23.23183 e = 0.4104149 Node = 327.33888 (1950.0) a = 3.6920139 AU Inc. = 19.16459 nß= 0.13893417 q = 2.1767564 AU P = 7.094 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 ¡ , " " " 1964 07 16.30965 22 11 16.05 -20 08 52.1 1.6+ 0.3- 689/FS 1964 07 16.37215 22 11 14.12 -20 08 36.0 1.1+ 0.4+ 689/FS 1964 07 17.33253 22 10 45.82 -20 04 35.9 0.2- 0.8- 689/FS 1964 07 17.39295 22 10 43.94 -20 04 20.8 0.7+ 0.7- 689/FS 1964 09 11.22536 21 22 00.79 -14 54 13.3 0.7+ 0.2- 689/FS - continued - P/Holmes NK 535 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1964 09 11.29342 21 21 57.94 -14 53 43.6 1.3+ 0.8- 689/FS 1964 09 29.15150 21 14 33.73 -12 35 14.9 0.4- 0.3+ 689/FS 1964 09 29.22580 21 14 32.98 -12 34 39.5 0.1+ 0.2- 689/FS 1964 10 28.11230 21 22 38.95 -08 31 17.3 0.2- 0.0 689/FS 1964 10 28.16751 21 22 40.96 -08 30 49.1 1.6- 1.1- 689/FS 1964 11 28.09320 21 52 30.20 -03 38 15.3 0.6+ 0.1+ 689/FS 1965 01 02.13258 22 41 26.96 +02 48 08.1 2.3- 0.1- 689/FS 1971 06 20.38542 19 42 35.10 -43 29 29.3 0.7+ 1.7+ 693/CT 1971 06 27.31892 19 36 22.53 -43 33 08.5 0.1- 1.2+ 691/ST 1971 06 27.37135 19 36 19.32 -43 33 07.5 0.1+ 1.9+ 691/ST 1971 09 21.12292 18 54 54.96 -31 49 17.0 1.6- 0.0 691/ST 1971 09 21.16754 18 54 56.90 -31 48 47.1 1.8- 0.2- 691/ST 1971 09 22.12222 18 55 41.50 -31 38 08.0 1.3- 0.3- 691/ST 1971 10 15.10417 19 19 56.57 -27 25 32.3 0.2+ 0.8+ 691/ST 1971 10 16.10256 19 21 14.11 -27 14 38.3 0.5+ 0.0 691/ST 1972 09 13.37500 05 38 49.41 +43 17 36.5 0.6- 1.1- 691/ST 1972 09 13.42153 05 38 52.81 +43 17 53.9 0.0 0.6- 691/ST 1972 10 03.39855 05 58 11.73 +45 13 33.4 0.2+ 0.3- 691/ST 1972 10 03.44606 05 58 13.63 +45 13 50.8 0.1+ 0.3+ 691/ST 1972 12 13.39068 05 24 20.22 +48 41 01.5 0.1+ 0.2+ 691/ST 1972 12 13.44867 05 24 15.70 +48 40 48.6 0.9- 0.5+ 691/ST 1973 01 30.19971 04 50 49.24 +43 02 59.0 0.7+ 0.5+ 691/ST 1973 01 30.24994 04 50 49.24 +43 02 36.3 1.2+ 2.1+ 691/ST 1979 07 20.29580 03 43 14.55 +35 49 59.9 ( 6.0- 2.3+) 801/HO 1979 07 30.76250 04 02 35.8 +37 34 30 ( 3.4- 6.1+) 372/sk Y 1979 07 31.29941 04 03 34.75 +37 39 43.0 ( 5.0+ 11.3+) 801/HO 1979 09 01.32601 04 55 40.85 +42 15 03.4 1.0+ 1.1+ 801/HO 1979 09 17.33907 05 15 20.31 +44 16 33.3 0.6- 0.1- 801/HO 1980 02 11.09941 04 26 28.66 +41 22 01.1 0.4- 0.6+ 801/HO 1986 06 09.45579 02 04 13.41 +25 20 34.2 0.7- 0.4+ 675/PL 1986 06 09.45845 02 04.22 +25 21.2 ( 7.7- 35.8+) 675/PL Y 1986 06 09.46169 02 04 14.11 +25 20 39.5 0.4- 0.4+ 675/PL 1986 06 10.44817 02 06 07.34 +25 35 21.2 0.6- 0.5+ 675/PL 1986 06 10.45079 02 06.14 +25 35.2 ( 9.7+ 11.0-) 675/PL Y 1986 06 10.45347 02 06 07.95 +25 35 26.0 0.6- 0.5+ 675/PL 1986 06 11.45347 02 08 02.76 +25 50 15.5 0.3+ 0.3+ 675/PL 1986 06 11.45729 02 08.07 +25 50.3 (13.8+ 0.6-) 675/PL Y 1986 06 11.46306 02 08 03.88 +25 50 24.2 0.6+ 0.4+ 675/PL 1986 09 27.44652 04 53 36.44 +46 02 24.8 0.8+ 0.9- 691/ST 1986 10 25.28311 04 55 15.65 +49 23 36.2 1.3+ 2.3+ 691/ST 1986 10 25.29358 04 55 15.39 +49 23 39.5 1.9+ 2.0+ 691/ST 1986 10 25.31063 04 55 14.85 +49 23 45.5 1.8+ 2.1+ 691/ST 1986 10 30.37462 04 52 16.98 +49 49 13.0 0.9- 0.2+ 691/ST 1986 10 30.39318 04 52 16.24 +49 49 17.1 0.3- 0.8- 691/ST 1986 10 30.41022 04 52 15.49 +49 49 22.2 0.4- 0.3- 691/ST 1986 12 27.27399 03 53 29.00 +46 53 09.9 0.7- 1.4- 691/ST 1986 12 27.28231 03 53 28.70 +46 53 06.2 0.7- 0.6- 691/ST 1986 12 27.29758 03 53 28.17 +46 52 57.4 0.6- 1.1- 691/ST 1986 12 29.29597 03 52 25.14 +46 35 02.8 0.0 1.5- 691/ST 1986 12 29.30682 03 52 24.81 +46 34 57.6 0.1+ 0.7- 691/ST 1986 12 29.32741 03 52 24.12 +46 34 45.9 0.4- 1.1- 691/ST ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1990 May 2