OAA computing section circular NK 467 Periodic Comet Bradfield 1984a

The following improved orbital elements, by S. Nakano, are from 32 observations 1984 Jan. 9 to 1984 May 30. Perturba- tions by Mercury to Pluto were taken into account. The mean residual is +/- 1.27 arc seconds: Epoch = 1983 Dec. 12.0 ET T = 1983 Dec. 27.79208 +/- 0.00552 (m.e.) ET Peri. = 219.16023 +/- 0.00598 Node = 356.15939 +/- 0.00344 1950.0 Inc. = 51.79436 +/- 0.00254 q = 1.3574471 +/- 0.0000774 AU e = 0.9521900 +/- 0.0001870 1/a = +0.0352205 +/- 0.0001378 1/AU (P = 151.29 years) The extension orbit is from the above orbital elements: Epoch = 1985 May 15.0 ET T = 1983 Dec. 27.69318 ET Peri. = 219.15001 e = 0.9518161 Node = 356.14384 1950.0 q = 1.3573146 AU Inc. = 51.81247 m1 = 9.6 (k=10) m2 = 13.5 (k=5) The following residuals in seconds of arc are from the above orbital elements: Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s , " " " 1984 Jan. 9.82361 16 01 54.70 -48 02 56.7 1.5- 2.9- 323/PR 11.82361 16 11 54.66 -49 14 54.5 0.4+ 0.2+ 323/PR 12.82361 16 17 03.40 -49 49 48.7 0.1- 1.2+ 323/PR 13.81944 16 22 16.92 -50 23 51.0 0.6+ 0.8- 323/PR 14.59400 16 26 27.22 -50 49 41.9 (23.9+ 0.4+) 474/JN 5 14.62730 16 26 37.16 -50 50 56.6 (16.1+ 7.6-) 474/JN 5 15.62396 16 31 59.83 -51 23 23.1 1.4- 0.7- 474/JN 15.63438 16 32 03.37 -51 23 42.4 0.4- 0.3+ 474/JN 16.83362 16 38 41.93 -52 01 43.3 0.1- 1.6+ 323/PR 20.82396 17 01 48.89 -53 58 30.6 1.2- 1.9- 323/PR - continued - Periodic Comet Bradfield NK 467-2 Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s , " " " 23.81701 17 20 08.28 -55 15 16.4 1.7+ 2.5+ 323/PR 24.81701 17 26 25.54 -55 38 47.7 0.3- 0.0 323/PR 25.82101 17 32 49.58 -56 01 13.8 2.1+ 0.2- 323/PR 27.83843 17 45 53.73 -56 42 46.6 0.3+ 1.0- 323/PR 28.65242 17 51 14.45 -56 58 06.2 1.4- 1.7+ 474/JN 28.65855 17 51 16.90 -56 58 12.4 1.2- 2.4+ 474/JN Feb. 1.84931 18 19 21.38 -58 04 46.2 0.4+ 1.4+ 323/PR 2.84514 18 26 07.17 -58 17 26.7 0.8+ 0.4+ 323/PR 3.84097 18 32 54.07 -58 28 54.0 0.7+ 0.2+ 323/PR 8.85347 19 07 02.45 -59 08 36.0 1.0- 2.8- 323/PR 9.82986 19 13 38.48 -59 12 53.1 0.8+ 0.4- 323/PR 13.83333 19 40 14.72 -59 19 50.8 0.2+ 1.0+ 323/PR 15.83194 19 53 10.24 -59 17 15.9 2.4+ 0.9+ 323/PR 24.85139 20 47 14.19 -58 24 12.5 0.5+ 0.5+ 323/PR 29.84028 21 13 39.44 -57 32 52.5 1.3- 2.3- 323/PR Mar. 13.84757 22 10 47.47 -54 40 53.8 0.5+ 1.6- 323/PR Apr. 1.72222 23 09 35.09 -50 15 43.3 0.3+ 0.6+ 474/JN 1.73229 23 09 36.56 -50 15 36.6 0.3- 0.5- 474/JN 2.72894 23 12 06.78 -50 02 34.7 0.7- 1.0+ 474/JN 27.82917 0 01 19.22 -45 37 14.5 0.5- 1.5- 323/PR May 26.69675 0 33 07.43 -43 26 57.6 0.3- 0.6- 474/JN 26.72985 0 33 08.90 -43 26 56.1 0.8+ 1.0- 474/JN 30.74851 0 35 44.82 -43 24 13.0 2.0- 0.2- 474/JN 30.77999 0 35 46.25 -43 24 09.8 1.9+ 2.8+ 474/JN 8 ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1984 December 5

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