OAA computing section circular NK 547 Periodic Comet Shoemaker-Levy 2 (1990p)

The following improved orbital elements, by S. Nakano, are from 20 observations 1990 Sept. 17 to 1991 Jan. 15, including full planetary and five minor planets perturbations. The mean residual is +/- 0.70 arc second. Epoch = 1990 Sept.26.0 ET T = 1990 Sept.25.39338 +/- 0.00971 (m.e.) ET Peri. = 140.14878 +/- 0.02392 Node = 235.22731 +/- 0.02357 (1950.0) Inc. = 4.64040 +/- 0.00168 q = 1.8440507 +/- 0.0001660 AU e = 0.5823057 +/- 0.0000215 a = 4.4148330 +/- 0.0003260 AU nß = 0.10625091 +/- 0.00001176 P = 9.276 +/- 0.0010275 years (+/- 0.38 day) The predicted orbit for the 2000 return is as follows: T = 2000 Feb. 6.53198 ET Epoch = 2000 Feb. 26.0 ET Peri. = 142.09588 e = 0.5798245 Node = 233.98597 (1950.0) a = 4.4473327 AU Inc. = 4.66028 nß= 0.10508837 q = 1.8686605 AU P = 9.379 years The following residuals from the above orbital elements: Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs h m s ¡ , " " " 1990 09 17.43524 01 45 00.90 +17 35 32.3 0.4- 0.0 675/PL 1990 09 17.46944 01 45 01.56 +17 35 33.5 0.7+ 0.5+ 675/PL 1990 09 20.51396 01 45 55.33 +17 35 29.9 0.9+ 1.1- 675/PL 1990 10 14.40313 01 44 58.37 +16 15 37.0 0.7- 0.1- 675/PL 1990 10 16.35851 01 44 27.86 +16 03 57.2 0.4- 0.4+ 675/PL 1990 10 25.37447 01 41 56.61 +15 05 04.4 0.4- 1.1+ 675/PL 1990 10 25.41319 01 41 55.81 +15 04 47.5 1.1- 0.3+ 675/PL 1990 11 13.23819 01 39 08.23 +13 04 54.4 0.6+ 0.0 675/PL 1990 11 13.27777 01 39 08.14 +13 04 39.8 0.3+ 1.9- 675/PL 1990 11 15.24462 01 39 14.02 +12 54 29.4 1.0- 1.1+ 675/PL 1990 11 15.27447 01 39 14.23 +12 54 18.5 1.6+ 0.8- 675/PL 1990 12 07.11403 01 47 01.30 +11 51 29.2 0.7+ 0.2+ 688/LO 1990 12 07.11742 01 47 01.42 +11 51 29.0 0.7+ 0.1+ 688/LO 1990 12 07.53646 01 47 17.09 +11 51 13.4 ( 2.2- 0.4-) 372/sk 1990 12 07.57361 01 47 17.79 +11 51 12.9 (11.7- 0.4+) 372/sk 1990 12 11.44184 01 49 59.50 +11 50 31.6 1.4- 0.1- 568/MK 1990 12 12.40278 01 50 42.97 +11 50 48.2 0.6- 0.0 568/MK 1990 12 15.05493 01 52 49.59 +11 52 24.6 0.3+ 0.1+ 801/HO 1990 12 15.07186 01 52 50.40 +11 52 25.3 0.5+ 0.1- 801/HO 1990 12 18.48140 01 55 46.62 +11 56 32.4 0.1- 0.2+ 413/SS 1991 01 15.11764 02 27 35.91 +13 28 06.8 0.5- 0.1- 688/LO 1991 01 15.12272 02 27 36.39 +13 28 08.4 0.6+ 0.0 688/LO ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1991 February 2

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