OAA computing section circular NK 525 Periodic Comet Daniel
The following improved orbital elements, by S. Nakano, are from 18 observations 1964 to 1986, including full planetary perturbations and non-gravitational effect of style II. The mean residual is +/- 1.22 arc seconds. Epoch = 1985 Aug. 3.0 ET T = 1985 Aug. 4.23989 +/- 0.00350 (m.e.) ET Peri. = 10.82289 +/- 0.00226 Node = 68.45265 +/- 0.00052 (1950.0) Inc. = 20.14233 +/- 0.00011 q = 1.6511119 +/- 0.0000338 AU e = 0.5518050 +/- 0.0000082 a = 3.6839142 +/- 0.0000151 AU nß = 0.13939263 +/- 0.00000086 P = 7.071 +/- 0.0000436 years A1 = +0.290 +/- 0.349 A2 = +0.07030 +/- 0.00478 T = 1964 Apr. 21.20754 ET Epoch = 1964 May 5.0 ET Peri. = 10.77011 e = 0.5499708 Node = 68.51622 (1950.0) a = 3.6919181 AU Inc. = 20.14385 nß= 0.13893958 q = 1.6614710 AU P = 7.094 years ( T = 1971 May 31.69447 ET Epoch = 1971 June 18.0 ET Peri. = 10.81901 e = 0.5486774 Node = 68.48706 (1950.0) a = 3.7009462 AU Inc. = 20.11433 nß= 0.13843149 q = 1.6703206 AU P = 7.120 years ) T = 1978 July 8.40553 ET Epoch = 1978 June 21.0 ET Peri. = 10.82513 e = 0.5499499 Node = 68.49657 (1950.0) a = 3.6920334 AU Inc. = 20.13963 nß= 0.13893307 q = 1.6616001 AU P = 7.094 years The predicted orbit for the 1992 return is as follows: T = 1992 Sept. 1.67095 ET Epoch = 1992 Sept.15.0 ET Peri. = 10.99168 e = 0.5519641 Node = 68.37000 (1950.0) a = 3.6815158 AU Inc. = 20.13398 nß= 0.13952887 q = 1.6494513 AU P = 7.064 years - continued - P/Daniel NK 525 - 2 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 02 06.12934 01 00 17.62 -02 32 39.7 1.1- 2.4+ 689/FS 1964 02 13.12908 01 13 17.30 -00 00 26.0 0.1+ 3.2+ 689/FS 1964 03 09.13825 02 04 51.17 +09 01 00.8 2.5- 1.3- 689/FS 1979 02 02.69097 13 12 39.95 +22 01 41.9 0.9- 2.9- 413/SS 1979 02 02.73264 13 12 39.90 +22 02 04.1 0.9- 0.7+ 413/SS 1979 02 07.72212 13 12 18.25 +22 39 54.0 0.1- 0.3+ 413/SS 1985 07 27.48785 06 12 40.03 +24 53 16.0 0.4+ 0.5- 675/PL 1985 07 27.49102 06 12 40.54 +24 53 16.8 0.7- 1.1- 675/PL 1985 07 28.48486 06 15 43.97 +25 00 24.4 1.1+ 0.4- 675/PL 1985 07 28.48861 06 15 44.61 +25 00 25.7 0.4+ 0.8- 675/PL 1985 07 29.48792 06 18 49.25 +25 07 22.8 0.8+ 1.0- 675/PL 1985 07 29.49167 06 18 49.89 +25 07 24.7 0.0 0.7- 675/PL 1986 02 11.39417 12 46 27.46 +28 42 25.5 0.6+ 0.5- 691/ST 1986 02 11.40475 12 46 27.11 +28 42 31.4 0.0 0.3- 691/ST 1986 02 11.42453 12 46 26.54 +28 42 41.4 0.1+ 1.0- 691/ST 1986 03 07.50066 12 27 22.18 +31 37 01.0 0.2+ 0.9+ 691/ST 1986 03 07.51392 12 27 21.37 +31 37 05.2 0.8+ 1.7+ 691/ST 1986 03 07.52053 12 27 20.92 +31 37 07.6 0.4+ 2.4+ 691/ST ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1988 November 1