OAA computing section circular NK 503 Periodic Comet Peters-Hartley 1982 III
The following improved orbital elements, by S. Nakano, are from 19 observations 1982 July 11 to Sept. 11. Perturbations by all nine planets were taken into account. The mean residual is +/- 0.99 arc second: Epoch = 1982 Apr. 21.0 ET T = 1982 May 8.56680 +/- 0.01627 (m.e.) ET Peri. = 338.19782 +/- 0.01277 Node = 259.35072 +/- 0.01096 (1950.0) Inc. = 29.85334 +/- 0.00595 q = 1.6225406 +/- 0.0008607 AU e = 0.5982087 +/- 0.0001364 a = 4.0382673 +/- 0.0016456 AU n_ = 0.12145390 +/- 0.00007424 P = 8.115 +/- 0.0049605 years (+/- 1.81 days) The predicted orbit for the 1990 return is as follows: T = 1990 June 21.60047 ET Epoch = 1990 July 8.0 ET Peri. = 338.31328 e = 0.5977503 Node = 259.39485 (1950.0) a = 4.0417062 AU Inc. = 29.83261 n_= 0.12129893 q = 1.6257753 AU P = 8.125 years The following residuals in seconds of arc are from the above orbital elements: Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs 1982 07 11.46714 16 49 28.44 -07 02 01.2 0.7- 0.9+ 413/SS 1982 07 13.46319 16 50 07.31 -06 17 34.9 ( 1.0- 6.3+) 323/PR 1982 07 14.45139 16 50 29.01 -05 56 53.8 1.1+ 1.3- 323/PR 1982 07 15.17014 16 50 45.58 -05 42 20.8 ( 4.1+ 2.6+) 688/LO 1982 07 15.20556 16 50 46.57 -05 41 37.8 ( 8.1+ 2.8+) 688/LO 1982 07 15.58009 16 50 54.82 -05 33 57.5 2.2+ 1.1+ 474/JN 1982 07 15.61331 16 50 55.38 -05 33 19.7 1.0- 0.8- 474/JN 1982 07 16.19688 16 51 10.36 -05 22 05.2 0.6- 1.0+ 707/ev 1982 07 16.38600 16 51 15.32 -05 18 14.4 0.8- 0.5- 474/JN 1982 07 16.47269 16 51 17.39 -05 16 35.4 0.5+ 1.5- 474/JN 1982 07 17.25451 16 51 37.93 -05 02 00.3 0.9- 0.4- 707/ev 1982 07 19.48403 16 52 42.70 -04 21 58.4 ( 3.0+ 2.9+) 413/SS 1982 07 20.56528 16 53 16.66 -04 03 51.9 ( 2.1+ 4.4+) 323/PR 1982 07 21.57187 16 53 49.97 -03 47 53.9 ( 5.7+ 3.6+) 372/sk 1982 07 22.51777 16 54 22.36 -03 33 12.2 ( 3.0+ 1.3-) 474/JN 1982 07 22.54022 16 54 22.93 -03 32 44.5 ( 0.4+ 6.0+) 474/JN 1982 07 23.06793 16 54 42.09 -03 25 09.4 0.4+ 0.5+ 801/HO 1982 07 23.20035 16 54 46.78 -03 23 12.6 0.6+ 0.2- 707/ev 1982 07 23.40317 16 54 54.34 -03 20 02.5 1.9+ 0.3- 474/JN 1982 07 23.43222 16 54 55.14 -03 19 35.9 0.8- 0.8+ 474/JN 1982 07 24.39216 16 55 30.98 -03 05 54.1 1.7- 0.5+ 474/JN 1982 07 24.42133 16 55 32.07 -03 05 29.2 0.8- 0.9+ 474/JN 1982 07 25.07877 16 55 57.53 -02 56 38.7 0.9+ 0.1- 801/HO 1982 08 12.29035 17 11 18.84 -00 08 00.5 1.1- 0.6- 675/PL 1982 08 14.24591 17 13 20.02 +00 02 37.4 0.6- 1.3- 675/PL 1982 08 19.04862 17 18 33.38 +00 24 19.4 1.8+ 1.1+ 801/HO 1982 09 11.17715 17 48 00.13 +01 10 21.2 0.2- 0.2+ 675/PL ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1987 August 20