OAA computing section circular NK 563 Periodic Comet Shoemaker 1
The following improved orbital elements, by S. Nakano, are from 67 observations 1984 to 1991. Perturbations by all nine planets and five minor planets were taken into account. The mean residual is +/- 1.00 arc second. Epoch = 1991 Dec. 10.0 TT T = 1991 Dec. 18.21209 +/- 0.00290 (m.e.) TT Peri. = 18.76683 +/- 0.00124 Node = 339.95166 +/- 0.00123 (2000.0) Inc. = 26.24288 +/- 0.00024 q = 1.9857434 +/- 0.0000059 AU e = 0.4703494 +/- 0.0000016 a = 3.7491575 +/- 0.0000012 AU nß = 0.13576992 +/- 0.00000006 P = 7.259 +/- 0.0000034 years T = 1984 Sept.16.61473 TT Epoch = 1984 Sept.17.0 TT Peri. = 18.66596 e = 0.4714363 Node = 340.01354 (2000.0) a = 3.7399240 AU Inc. = 26.27761 nß= 0.13627303 q = 1.9767880 AU P = 7.233 years The predicted orbit for the 1999 return is as follows: T = 1999 Mar. 16.99414 TT Epoch = 1999 Mar. 3.0 TT Peri. = 18.67805 e = 0.4715196 Node = 339.97427 (2000.0) a = 3.7454656 AU Inc. = 26.26095 nß= 0.13597070 q = 1.9794053 AU P = 7.249 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 ¡ , " " " 1984 09 01.25002 23 52 48.7 +10 29 05 (12.2+ 33.4-) 801/HO Y 1984 09 22.05081 23 24 49.7 +16 10 25 0.8- 0.5- 801/HO Y 1984 09 27.22916 23 17 49.30 +17 15 44.1 0.8- 0.1- 675/PL 1984 09 28.29444 23 16 26.21 +17 28 05.3 0.1- 0.2+ 675/PL 1984 10 04.16954 23 09 19.78 +18 29 48.3 0.5- 0.5+ 675/PL 1984 10 04.23234 23 09 14.59 +18 30 20.4 ( 6.6- 2.2-) 801/HO 1984 10 05.17049 23 08 13.00 +18 39 14.6 1.3- 0.1- 657/VC 1984 10 05.23299 23 08 08.97 +18 39 48.5 1.7+ 1.4- 657/VC 1984 10 05.23395 23 08 08.40 +18 39 52.9 0.3- 2.1+ 801/HO 1984 10 05.24347 23 08 08.04 +18 39 57.3 0.8- 0.6- 675/PL 1984 10 05.58646 23 07 45.33 +18 43 16.3 ( 6.2- 0.8-) 323/PR 1984 10 06.16297 23 07 08.59 +18 48 19.1 ( 0.5+ 3.9-) 801/HO 1984 10 13.45174 23 00 22.12 +19 47 25.5 ( 1.7- 3.1-) 372/sk 1984 10 13.45868 23 00 21.75 +19 47 28.6 ( 2.0- 3.0-) 372/sk 1984 10 14.09028 22 59 52.55 +19 52 01.0 0.3+ 1.3- 688/LO - continued - P/Shoemaker 1 NK 563 - 2 Date/ UT R.A. (2000) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1984 10 14.09775 22 59 52.11 +19 52 04.9 0.8- 0.7- 688/LO 1984 10 14.54340 22 59 32.09 +19 55 08.2 ( 7.2+ 6.1-) 380/kj 1984 10 14.75319 22 59 22.67 +19 56 40.5 1.2+ 0.5+ 026/BE 1984 10 15.59306 22 58 45.86 +20 02 36.9 0.6- 0.7+ 323/PR 1984 10 15.82361 22 58 36.43 +20 03 59.5 0.2+ 0.2- 026/BE 1984 10 16.05686 22 58 26.72 +20 05 34.3 0.2- 0.1+ 801/HO 1984 10 16.79653 22 57 56.83 +20 10 27.5 ( 3.8- 0.6+) 026/BE 1984 10 16.84583 22 57 55.03 +20 10 45.0 0.3- 1.0- 017/HH 1984 10 16.88333 22 57 53.62 +20 11 00.0 1.7+ 0.7- 017/HH 1984 10 16.95833 22 57 50.42 +20 11 33.0 ( 0.0 3.2+) 017/HH 1984 10 17.09492 22 57 45.23 +20 12 24.0 1.1- 0.2- 801/HO 1984 10 17.12311 22 57 44.54 +20 12 34.1 0.9+ 0.0 657/VC 1984 10 17.80208 22 57 18.98 +20 16 54.2 1.6+ 1.7- 026/BE 1984 10 18.80141 22 56 43.26 +20 23 11.6 1.5- 0.2+ 046/KL 1984 10 18.81600 22 56 42.88 +20 23 15.8 0.7+ 1.0- 046/KL 1984 10 19.14514 22 56 31.75 +20 25 19.3 0.2+ 0.0 707/ev 1984 10 19.24375 22 56 28.48 +20 25 54.8 2.0+ 0.4+ 657/VC 1984 10 20.15149 22 55 59.55 +20 31 20.1 0.1- 2.4- 657/VC 1984 10 20.85069 22 55 38.36 +20 35 30.0 1.7- 0.0 046/KL 1984 10 20.86510 22 55 38.17 +20 35 33.5 2.0+ 1.5- 046/KL 1984 10 22.31441 22 54 58.71 +20 43 52.0 0.9+ 1.4- 657/VC 1984 10 23.11111 22 54 39.81 +20 48 21.7 0.1- 0.2- 675/PL 1984 10 24.12569 22 54 17.71 +20 53 54.5 1.3+ 0.2+ 675/PL 1984 10 24.73299 22 54 05.63 +20 57 08.0 0.2- 0.4+ 046/KL 1984 10 24.74230 22 54 05.46 +20 57 10.6 0.1+ 0.1- 046/KL 1984 10 24.91661 22 54 01.99 +20 58 06.1 0.9+ 0.1+ 494/mn 1984 10 25.11285 22 53 58.70 +20 59 09.5 0.8+ 0.9- 675/PL 1984 10 25.87921 22 53 45.31 +21 03 11.7 0.5+ 2.2+ 056/SP 1984 10 25.91250 22 53 44.75 +21 03 20.8 0.9- 1.2+ 494/mn 1984 10 25.91688 22 53 44.62 +21 03 16.9 ( 1.6- 4.2-) 993/WL 1984 10 25.92569 22 53 44.40 +21 03 24.4 0.8- 0.7+ 056/SP 1984 10 25.96181 22 53 43.72 +21 03 35.3 ( 3.0- 0.4+) 984/ri 1984 10 26.11736 22 53 41.91 +21 04 26.8 0.4+ 1.3+ 675/PL 1984 10 27.11180 22 53 27.91 +21 09 31.7 0.5+ 0.3+ 675/PL 1984 10 28.74148 22 53 10.32 +21 17 39.2 0.7- 0.0 046/KL 1984 10 28.75039 22 53 10.27 +21 17 41.6 0.1- 0.2- 046/KL 1984 10 29.74837 22 53 02.53 +21 22 35.3 ( 5.7- 0.0 ) 046/KL 1984 10 29.75699 22 53 02.71 +21 22 38.5 2.2- 0.6+ 046/KL 1984 10 31.96146 22 52 54.78 +21 33 10.0 ( 5.7- 1.0-) 056/SP 1984 11 13.74688 22 56 00.89 +22 31 23.4 0.7+ 0.3- 046/KL 1984 11 13.75544 22 56 01.13 +22 31 26.6 0.8+ 0.6+ 046/KL 1984 11 18.81981 22 58 52.71 +22 54 36.0 0.1+ 1.5+ 046/KL 1984 11 18.82844 22 58 53.09 +22 54 37.7 0.9+ 0.8+ 046/KL 1984 11 19.98996 22 59 39.74 +23 00 02.0 0.2- 0.4- 801/HO 1984 11 21.18958 23 00 30.48 +23 05 41.8 0.8+ 0.2+ 675/PL 1984 11 22.71071 23 01 38.52 +23 12 50.9 ( 4.6- 4.4-) 114/ZE 1984 11 23.71470 23 02 26.24 +23 17 42.6 ( 0.6- 3.0-) 114/ZE 1984 11 23.74184 23 02 27.35 +23 17 54.3 ( 4.6- 1.2+) 046/KL 1984 11 23.75041 23 02 28.15 +23 17 56.5 1.0+ 0.9+ 046/KL 1984 11 24.11805 23 02 46.02 +23 19 45.7 1.4+ 1.5+ 675/PL - continued - P/Shoemaker 1 NK 563 - 3 Date/ UT R.A. (2000) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1984 11 24.73160 23 03 16.42 +23 22 43.0 1.8+ 0.6+ 046/KL 1984 11 24.74045 23 03 16.81 +23 22 45.3 1.3+ 0.3+ 046/KL 1984 11 24.77812 23 03 18.56 +23 22 56.0 0.7- 0.3+ 494/mn 1984 11 25.81240 23 04 11.17 +23 28 02.2 1.1- 0.7+ 979/ar 1984 11 25.82899 23 04 11.98 +23 28 07.6 1.5- 1.2+ 979/ar 1984 11 25.94090 23 04 17.95 +23 28 40.6 1.4- 0.1+ 801/HO 1984 11 26.63404 23 04 54.31 +23 32 06.1 ( 3.3- 1.5-) 114/ZE 1984 11 27.83600 23 05 59.55 +23 38 09.2 0.5- 0.8- 046/KL 1984 11 27.84456 23 06 00.02 +23 38 13.4 0.4- 0.8+ 046/KL 1984 11 28.73333 23 06 49.91 +23 42 44.2 1.7- 0.5- 046/KL 1984 11 28.74201 23 06 50.46 +23 42 44.7 ( 0.7- 2.7-) 046/KL 1984 12 14.73993 23 25 08.00 +25 12 57.7 ( 9.6+ 2.8+) 056/SP 1984 12 14.78993 23 25 11.54 +25 13 14.7 ( 4.8+ 1.6+) 056/SP 1984 12 17.98524 23 29 30.31 +25 33 13.2 2.0- 0.5- 801/HO 1984 12 20.94681 23 33 40.98 +25 52 20.9 2.6- 0.5- 801/HO 1984 12 26.97573 23 42 40.25 +26 33 07.5 ( 1.5+ 5.3+) 801/HO 1985 01 22.02073 00 27 25.69 +29 50 19.8 ( 1.6+ 5.7+) 801/HO 1985 01 24.00126 00 31 09.40 +30 06 13.1 0.2+ 0.6- 801/HO 1985 02 19.98999 01 25 25.17 +33 46 57.4 ( 3.3+ 4.2+) 801/HO 1991 06 08.70869 21 43 41.07 -43 18 44.8 0.9- 0.6+ 474/JN 1991 06 08.75557 21 43 42.24 -43 18 49.9 0.3- 0.1+ 474/JN 1991 06 10.71829 21 44 28.97 -43 22 12.7 0.9- 1.4- 474/JN 1991 06 10.74873 21 44 29.34 -43 22 15.3 ( 3.5- 0.9-) 474/JN 1991 08 31.56316 20 32 36.29 -37 24 22.1 0.2+ 1.1+ 413/SS 1991 09 01.52744 20 31 45.16 -37 08 12.8 1.2- 1.7+ 372/sk 1991 09 01.53715 20 31 44.87 -37 08 06.0 1.8+ 1.3- 372/sk 1991 11 05.94855 20 54 38.19 -16 57 04.6 ( 2.8+ 4.4-) 801/HO 1991 11 05.95608 20 54 38.72 -16 56 55.7 ( 2.5+ 3.6-) 801/HO ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1991 December 24