OAA computing section circular NK 560 Periodic Comet Shoemaker-Levy 4 (1991f)
The following improved orbital elements, by S. Nakano, are from 26 observations 1991 Feb. 12 to Apr. 19. Perturbations by all nine planets and five minor planets were taken into account. The mean residual is +/- 0.89 arc second. Epoch = 1990 July 4.0 TT T = 1990 July 14.45917 +/- 0.06731 (m.e.) TT Peri. = 302.30984 +/- 0.03752 Node = 152.08571 +/- 0.03546 (2000.0) Inc. = 8.46671 +/- 0.00435 q = 2.0193016 +/- 0.0006230 AU e = 0.4209017 +/- 0.0001401 a = 3.4869758 +/- 0.0006672 AU nß = 0.15136681 +/- 0.00004345 P = 6.511 +/- 0.0018689 years (+/- 0.68 day) The predicted orbit for the 1997 return is as follows: T = 1997 Jan. 11.96353 TT Epoch = 1996 Dec. 23.0 TT Peri. = 302.02673 e = 0.4204913 Node = 152.08505 (2000.0) a = 3.4873750 AU Inc. = 8.46796 nß= 0.15134083 q = 2.0209642 AU P = 6.513 years The following residuals in seconds of arc are from the above orbital elements: Date/ UT R.A. (2000) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1991 02 09.45590 12 11 51.79 +02 14 15.6 ( 1.1+ 3.9-) 675/PL 1991 02 11.27244 12 11 21.30 +02 25 46.4 ( 5.0+ 0.2-) 675/PL 1991 02 12.74356 12 10 51.94 +02 35 32.0 0.4+ 0.7+ 413/SS 1991 02 12.76840 12 10 51.37 +02 35 34.9 1.0- 0.9- 372/sk 1991 02 12.77951 12 10 51.18 +02 35 40.3 0.1- 0.0 372/sk 1991 02 13.63558 12 10 33.17 +02 41 31.6 0.2+ 0.3- 413/SS 1991 02 14.46372 12 10 14.78 +02 47 05.0 ( 6.0+ 2.4-) 675/PL 1991 02 16.28935 12 09 29.68 +02 59 58.6 ( 5.7- 0.5+) 801/HO 1991 02 16.33456 12 09 28.81 +03 00 17.9 0.3- 0.4+ 801/HO 1991 02 16.42465 12 09 26.61 +03 00 56.4 0.5+ 0.6- 675/PL 1991 02 16.44306 12 09 26.08 +03 01 05.5 0.2+ 0.6+ 675/PL 1991 02 20.39201 12 07 34.34 +03 30 21.1 0.0 0.5- 675/PL 1991 02 20.42205 12 07 33.22 +03 30 35.3 2.1- 0.0 675/PL 1991 02 20.65208 12 07 26.45 +03 32 20.5 1.1+ 0.3- 372/sk 1991 02 20.66285 12 07 26.12 +03 32 26.8 1.5+ 1.0+ 372/sk 1991 02 25.76720 12 04 32.86 +04 12 43.3 0.2+ 0.6+ 413/SS 1991 03 09.34340 11 56 40.69 +05 47 54.2 0.2- 1.5- 675/PL 1991 03 09.37917 11 56 38.95 +05 48 12.3 1.7- 1.1- 675/PL 1991 03 13.20866 11 53 48.94 +06 19 23.6 0.0 0.5+ 801/HO 1991 03 13.22346 11 53 48.25 +06 19 30.4 0.1- 0.1+ 801/HO - continued - P/Shoemaker-Levy 4 NK 560 - 2 Date/ UT R.A. (2000) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1991 03 16.31994 11 51 29.35 +06 44 01.9 0.1+ 0.2+ 801/HO 1991 03 16.33069 11 51 28.82 +06 44 06.4 0.4- 0.3- 801/HO 1991 03 16.65313 11 51 14.61 +06 46 37.4 0.6+ 0.6- 372/sk 1991 03 16.66493 11 51 14.10 +06 46 45.8 1.2+ 2.3+ 372/sk 1991 04 12.13495 11 34 49.93 +09 22 41.6 0.4+ 1.1+ 801/HO 1991 04 12.16303 11 34 49.21 +09 22 47.0 0.7+ 0.5+ 801/HO 1991 04 14.22934 11 34 00.25 +09 29 46.7 0.3+ 1.8- 675/PL 1991 04 14.26559 11 33 59.21 +09 29 54.2 2.1- 1.3- 675/PL 1991 04 16.26559 11 33 17.25 +09 35 52.8 ( 4.3+ 3.0-) 675/PL 1991 04 17.21528 11 32 58.36 +09 38 38.4 ( 4.3- 7.5+) 675/PL 1991 04 17.25347 11 32 57.95 +09 38 41.0 ( 1.1+ 4.1+) 675/PL 1991 04 19.09503 11 32 25.66 +09 43 07.5 0.7+ 0.6+ 801/HO 1991 04 19.14242 11 32 24.76 +09 43 13.9 0.2- 0.6+ 801/HO ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1991 December 24