OAA computing section circular NK 511 Periodic Comet Shoemaker 1 1984 XVI
The following improved orbital elements, by S. Nakano, are from 65 observations 1984 Sept. 22 to 1985 Feb. 19. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.11 arc seconds: Epoch = 1984 Sept.17.0 ET T = 1984 Sept.16.64871 +/- 0.00921 (m.e.) ET Peri. = 18.68590 +/- 0.00606 Node = 339.31016 +/- 0.00599 (1950.0) Inc. = 26.27132 +/- 0.00124 q = 1.9768865 +/- 0.0001521 AU e = 0.4714894 +/- 0.0000242 a = 3.7404858 +/- 0.0002314 AU n_ = 0.13624233 +/- 0.00001264 P = 7.234 +/- 0.0006714 years (+/- 0.25 day) The predicted orbit for the 1991 return is as follows: T = 1991 Dec. 18.84531 ET Epoch = 1991 Dec. 10.0 ET Peri. = 18.78676 e = 0.4704026 Node = 339.24824 (1950.0) a = 3.7497289 AU Inc. = 26.23656 n_= 0.13573888 q = 1.9858468 AU P = 7.261 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 ! , " " " 1984 09 01.25002 23 50 15.4 +10 12 24 (16.2+ 35.2-) 801/HO Y 1984 09 22.05081 23 22 19.0 +15 53 56 0.8+ 0.3- 801/HO Y 1984 09 27.22916 23 15 19.40 +16 59 20.0 0.2- 0.1- 675/PL 1984 09 28.29444 23 13 56.49 +17 11 42.3 0.5+ 0.2+ 675/PL 1984 10 04.16954 23 06 50.98 +18 13 31.9 0.4- 0.8+ 675/PL 1984 10 04.23234 23 06 45.8 +18 14 04 ( 6.5- 2.0-) 801/HO Y 1984 10 05.17049 23 05 44.36 +18 22 59.3 1.1- 0.2+ 657/VC 1984 10 05.23299 23 05 40.33 +18 23 33.2 1.8+ 1.2- 657/VC 1984 10 05.23395 23 05 39.77 +18 23 37.6 0.1- 2.3+ 801/HO 1984 10 05.24347 23 05 39.41 +18 23 42.0 0.6- 0.3- 675/PL 1984 10 05.58646 23 05 16.75 +18 27 01.4 ( 6.1- 0.5-) 323/PR 1984 10 06.16297 23 04 40.09 +18 32 04.8 ( 0.6+ 3.6-) 801/HO 1984 10 13.45174 22 57 54.61 +19 31 18.6 1.7- 2.7- 372/sk 1984 10 13.45868 22 57 54.24 +19 31 21.7 2.0- 2.7- 372/sk 1984 10 14.09028 22 57 25.11 +19 35 54.7 0.1+ 0.9- 688/LO 1984 10 14.09775 22 57 24.67 +19 35 58.6 1.0- 0.3- 688/LO 1984 10 14.75319 22 56 55.31 +19 40 34.7 1.1+ 0.8+ 026/BE 1984 10 15.59306 22 56 18.60 +19 46 31.9 0.7- 1.1+ 323/PR 1984 10 15.82361 22 56 09.19 +19 47 54.6 0.1+ 0.1+ 026/BE 1984 10 16.05686 22 55 59.51 +19 49 29.6 0.3- 0.5+ 801/HO 1984 10 16.79653 22 55 29.70 +19 54 23.4 ( 3.9- 0.9+) 026/BE 1984 10 16.84583 22 55 27.9 +19 54 41 0.5- 0.6- 017/HH Y 1984 10 16.88333 22 55 26.5 +19 54 56 1.6+ 0.4- 017/HH Y 1984 10 16.95833 22 55 23.3 +19 55 29 ( 0.2- 3.5+) 017/HH Y 1984 10 17.09492 22 55 18.13 +19 56 20.1 1.2- 0.1+ 801/HO - continued - P/Shoemaker 1 NK 511 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1984 10 17.12311 22 55 17.44 +19 56 30.3 0.7+ 0.4+ 657/VC 1984 10 17.80208 22 54 51.95 +20 00 50.9 1.4+ 1.4- 026/BE 1984 10 18.80141 22 54 16.33 +20 07 09.0 1.6- 0.6+ 046/KL 1984 10 18.81600 22 54 15.95 +20 07 13.2 0.5+ 0.7- 046/KL 1984 10 19.14514 22 54 04.85 +20 09 16.9 0.0 0.3+ 707/ev 1984 10 19.24375 22 54 01.59 +20 09 52.5 1.8+ 0.8+ 657/VC 1984 10 20.15149 22 53 32.75 +20 15 18.4 0.2- 2.0- 657/VC 1984 10 20.85069 22 53 11.62 +20 19 28.7 1.9- 0.3+ 046/KL 1984 10 20.86510 22 53 11.43 +20 19 32.2 1.8+ 1.3- 046/KL 1984 10 22.31441 22 52 32.09 +20 27 51.5 0.8+ 1.1- 657/VC 1984 10 23.11111 22 52 13.25 +20 32 21.6 0.3- 0.0 675/PL 1984 10 24.12569 22 51 51.23 +20 37 54.9 1.2+ 0.4+ 675/PL 1984 10 24.73299 22 51 39.19 +20 41 08.6 0.4- 0.6+ 046/KL 1984 10 24.74230 22 51 39.02 +20 41 11.2 0.0 0.1+ 046/KL 1984 10 24.91661 22 51 35.56 +20 42 06.8 0.8+ 0.3+ 494/mn 1984 10 25.11285 22 51 32.28 +20 43 10.3 0.6+ 0.7- 675/PL 1984 10 25.87921 22 51 18.94 +20 47 12.8 0.3+ 2.5+ 056/SP 1984 10 25.91250 22 51 18.38 +20 47 21.9 1.1- 1.4+ 494/mn 1984 10 25.91688 22 51 18.25 +20 47 18.0 ( 1.8- 4.0-) 993/WL 1984 10 25.92569 22 51 18.04 +20 47 25.5 0.9- 1.0+ 056/SP 1984 10 25.96181 22 51 17.36 +20 47 36.4 ( 3.2- 0.6+) 984/LL 1984 10 26.11736 22 51 15.56 +20 48 27.9 0.3+ 1.4+ 675/PL 1984 10 27.11180 22 51 01.61 +20 53 33.1 0.3+ 0.5+ 675/PL 1984 10 28.74148 22 50 44.11 +21 01 41.0 0.8- 0.2+ 046/KL 1984 10 28.75039 22 50 44.06 +21 01 43.4 0.1- 0.1- 046/KL 1984 10 29.74837 22 50 36.36 +21 06 37.3 ( 5.8- 0.2+) 046/KL 1984 10 29.75699 22 50 36.54 +21 06 40.5 2.3- 0.8+ 046/KL 1984 11 13.74688 22 53 34.84 +22 15 21.7 1.0+ 0.3- 046/KL 1984 11 13.75544 22 53 35.08 +22 15 24.9 1.2+ 0.6+ 046/KL 1984 11 18.81981 22 56 26.47 +22 38 30.8 0.5+ 1.3+ 046/KL 1984 11 18.82844 22 56 26.85 +22 38 32.5 1.3+ 0.6+ 046/KL 1984 11 19.98996 22 57 13.44 +22 43 55.9 0.2+ 0.5- 801/HO 1984 11 21.18958 22 58 04.11 +22 49 34.7 1.2+ 0.1- 675/PL 1984 11 22.71071 22 59 12.06 +22 56 42.6 ( 4.2- 4.6-) 114/KK 1984 11 23.71470 22 59 59.71 +23 01 33.4 ( 0.1- 3.2-) 114/KK 1984 11 23.74184 23 00 00.82 +23 01 45.0 ( 4.1- 0.9+) 046/KL 1984 11 23.75041 23 00 01.62 +23 01 47.2 1.4+ 0.6+ 046/KL 1984 11 24.11805 23 00 19.47 +23 03 36.1 2.0+ 1.2+ 675/PL 1984 11 24.73160 23 00 49.82 +23 06 32.8 2.3+ 0.3+ 046/KL 1984 11 24.74045 23 00 50.21 +23 06 35.1 1.8+ 0.0 046/KL 1984 11 24.77812 23 00 51.96 +23 06 45.8 0.2- 0.0 494/mn 1984 11 25.81240 23 01 44.49 +23 11 51.1 0.6- 0.4+ 979/MM 1984 11 25.82899 23 01 45.30 +23 11 56.4 1.0- 0.8+ 979/MM 1984 11 25.94090 23 01 51.26 +23 12 29.3 0.9- 0.3- 801/HO 1984 11 26.63404 23 02 27.57 +23 15 54.2 2.7- 1.8- 114/KK 1984 11 27.83600 23 03 32.71 +23 21 56.1 0.1+ 1.2- 046/KL 1984 11 27.84456 23 03 33.18 +23 22 00.3 0.2+ 0.5+ 046/KL 1984 11 28.73333 23 04 22.99 +23 26 30.3 1.2- 0.9- 046/KL 1984 11 28.74201 23 04 23.54 +23 26 30.8 ( 0.2- 3.0-) 046/KL 1984 12 17.98524 23 27 00.92 +25 16 40.8 1.5- 1.3- 801/HO 1984 12 20.94681 23 31 11.07 +25 35 46.1 2.1- 1.4- 801/HO 1984 12 26.97573 23 40 09.17 +26 16 28.8 ( 1.9+ 4.4+) 801/HO 1985 01 22.02073 00 24 47.59 +29 33 44.3 ( 1.1+ 4.3+) 801/HO 1985 01 24.00126 00 28 30.63 +29 49 39.6 0.5- 2.1- 801/HO 1985 02 19.98999 01 22 35.47 +33 31 22.0 1.1+ 2.3+ 801/HO ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1987 August 20