OAA computing section circular NK 505 Periodic Comet Hartley 1 1985 VII

The following improved orbital elements, by S. Nakano, are from 11 observations 1985 June 13 to Aug. 14. Perturbations by all nine planets were taken into account. The mean residual is +/- 0.59 arc second: Epoch = 1985 June 24.0 ET T = 1985 June 11.58439 +/- 0.01052 (m.e.) ET Peri. = 174.09155 +/- 0.00580 Node = 40.41111 +/- 0.00582 (1950.0) Inc. = 24.91976 +/- 0.00257 q = 1.5386351 +/- 0.0025590 AU e = 0.5085228 +/- 0.0005488 a = 3.1306336 +/- 0.0038585 AU n_ = 0.17793268 +/- 0.00032889 P = 5.539 +/- 0.0102410 years (+/- 3.74 day) The predicted orbit for the 1991 return is as follows: T = 1991 Apr. 28.75213 ET Epoch = 1991 Apr. 14.0 ET Peri. = 179.47127 e = 0.4515362 Node = 38.30062 (1950.0) a = 3.2735982 AU Inc. = 25.56510 n_= 0.16640487 q = 1.7954501 AU P = 5.923 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 ! , " " " 1985 06 13.38141 11 45 24.29 +04 37 47.2 ( 5.0- 4.7+) 413/SS 1985 06 13.46175 11 45 31.64 +04 34 49.8 ( 2.9+ 4.8-) 413/SS 1985 06 13.47911 11 45 32.87 +04 34 18.2 0.9- 0.1- 413/SS 1985 06 21.35870 11 57 37.52 +00 05 01.2 0.7+ 0.3- 413/SS 1985 06 21.37606 11 57 38.94 +00 04 31.5 ( 2.3- 4.9+) 413/SS 1985 07 10.44414 12 31 06.33 -10 00 01.9 0.8+ 0.5+ 413/SS 1985 07 27.19236 13 04 55.99 -17 49 33.1 ( 0.7- 2.2+) 675/PL 1985 07 27.19771 13 04 56.67 -17 49 42.8 0.7- 0.9+ 675/PL 1985 07 28.19049 13 07 04.49 -18 15 39.6 1.2- 0.1+ 675/PL 1985 07 28.19205 13 07 04.76 -18 15 42.0 0.2- 0.2+ 675/PL 1985 07 28.19590 13 07 05.28 -18 15 48.1 0.2+ 0.0 675/PL 1985 07 29.17940 13 09 12.83 -18 41 17.2 1.0+ 0.4- 675/PL 1985 07 29.18667 13 09 13.72 -18 41 28.4 0.4+ 0.5- 675/PL 1985 08 14.32354 13 46 01.25 -25 08 18.6 0.4+ 0.2+ 474/JN 1985 08 14.36674 13 46 07.35 -25 09 16.6 0.4- 0.7- 474/JN ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1987 August 20

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