OAA computing section circular NK 565 Periodic Comet Hartley 2
The following improved orbital elements, by S. Nakano, are from 114 observations 1986 to 1991. Perturbations by all nine planets and five minor planets were taken into account. The mean residual is +/- 0.90 arc second. Epoch = 1991 Sept.21.0 TT T = 1991 Sept.11.65162 +/- 0.00007 (m.e.) TT Peri. = 174.89684 +/- 0.00024 Node = 226.78436 +/- 0.00023 (2000.0) Inc. = 9.25186 +/- 0.00004 q = 0.9533116 +/- 0.0000007 AU e = 0.7194842 +/- 0.0000002 a = 3.3984244 +/- 0.0000006 AU nß = 0.15732135 +/- 0.00000004 P = 6.265 +/- 0.0000017 years The predicted orbit for the 1997 return is as follows: T = 1997 Dec. 21.94380 TT Epoch = 1997 Dec. 18.0 TT Peri. = 180.72304 e = 0.7003594 Node = 219.95415 (2000.0) a = 3.4433235 AU Inc. = 13.61974 nß= 0.15425432 q = 1.0317597 AU P = 6.389 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 ¡ , " " " 1986 03 15.59361 11 25 25.15 -07 44 15.6 1.1+ 1.6- 413/SS 1986 03 17.67951 11 23 26.88 -07 27 42.7 1.8+ 1.3- 413/SS 1986 03 20.60691 11 20 45.41 -07 04 21.9 1.3- 1.6- 413/SS 1986 04 04.12772 11 09 13.39 -05 11 29.2 ( 5.1- 3.5-) 801/HO 1986 04 05.16007 11 08 32.84 -05 03 52.1 0.7+ 1.1- 801/HO 1986 04 05.20583 11 08 30.96 -05 03 31.3 2.1- 0.7- 675/PL 1986 04 05.21069 11 08 30.75 -05 03 28.7 2.3- 0.2- 675/PL 1986 04 05.21750 11 08 30.50 -05 03 26.0 2.0- 0.5- 675/PL 1986 04 08.15569 11 06 41.19 -04 42 22.9 1.6- 0.1- 675/PL 1986 04 08.16097 11 06 40.99 -04 42 20.5 1.7- 0.1+ 675/PL 1986 04 08.17083 11 06 40.64 -04 42 16.4 1.5- 0.1+ 675/PL 1986 05 10.15791 10 58 11.07 -01 59 12.6 1.0+ 0.9- 691/ST 1986 05 10.17935 10 58 11.11 -01 59 08.3 1.0+ 0.5- 691/ST 1986 05 10.19726 10 58 11.16 -01 59 04.9 1.3+ 0.3- 691/ST 1986 05 12.08925 10 58 17.95 -01 53 34.6 ( 3.0- 3.8+) 801/HO 1986 06 07.15793 11 05 31.14 -01 23 08.0 1.6+ 0.8- 691/ST 1986 06 07.16865 11 05 31.41 -01 23 08.9 1.5+ 1.5- 691/ST 1986 06 07.22340 11 05 32.86 -01 23 09.9 1.5+ 1.6- 691/ST 1991 07 12.31995 01 15 30.92 +21 36 55.9 0.2+ 0.2- 801/HO 1991 07 12.32387 01 15 32.01 +21 37 02.3 0.1- 0.2- 801/HO 1991 07 12.32899 01 15 33.41 +21 37 10.7 0.9- 0.1- 801/HO 1991 07 12.33093 01 15 33.95 +21 37 13.8 1.0- 0.2- 801/HO 1991 07 12.66032 01 17 08.39 +21 46 18.2 1.3- 1.1- 474/JN 1991 07 12.66032 01 17 08.39 +21 46 18.2 1.3- 1.1- 474/JN 1991 07 12.67236 01 17 11.96 +21 46 38.7 0.6+ 0.2- 474/JN - continued - P/Hartley 2 NK 565 - 2 Date/ UT R.A. (2000) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1991 07 12.67236 01 17 11.96 +21 46 38.7 0.6+ 0.2- 474/JN 1991 07 13.32439 01 20 20.68 +22 03 57.7 0.3- 0.3- 801/HO 1991 07 13.32778 01 20 21.64 +22 04 03.2 0.5- 0.3- 801/HO 1991 07 13.33084 01 20 22.53 +22 04 08.1 0.5- 0.4- 801/HO 1991 07 14.68021 01 27 00.56 +22 40 07.1 0.6+ 0.8+ 372/sk 1991 07 14.68404 01 27 01.62 +22 40 12.7 0.4- 0.2+ 372/sk 1991 07 14.69208 01 27 04.16 +22 40 26.5 1.7+ 1.1+ 372/sk 1991 07 15.31269 01 30 10.12 +22 56 47.7 0.0 0.1+ 801/HO 1991 07 15.31440 01 30 10.63 +22 56 50.5 0.0 0.1+ 801/HO 1991 07 16.33961 01 35 22.75 +23 23 38.6 0.1- 0.3- 801/HO 1991 07 16.34090 01 35 23.15 +23 23 41.0 0.0 0.1+ 801/HO 1991 07 23.39409 02 13 45.79 +26 15 43.4 0.6+ 0.8- 657/VC 1991 07 23.39584 02 13 46.35 +26 15 45.7 0.0 0.9- 657/VC 1991 08 02.70763 03 17 20.08 +29 21 48.9 2.2- 0.2- 372/sk 1991 08 06.36137 03 41 24.69 +30 00 39.0 0.2- 0.8- 801/HO 1991 08 06.41240 03 41 45.29 +30 01 01.8 0.9+ 0.7- 657/VC 1991 08 06.41341 03 41 45.65 +30 01 02.4 0.4+ 0.6- 657/VC 1991 08 07.35828 03 48 03.78 +30 08 22.5 0.2+ 0.6- 801/HO 1991 08 11.08957 04 13 06.44 +30 25 53.4 1.1+ 1.5+ 098/CD 1991 08 11.11811 04 13 17.39 +30 25 56.6 ( 5.4- 0.3+) 098/CD 1991 08 12.06835 04 19 41.04 +30 27 26.9 0.9- 0.9+ 098/CD 1991 08 12.07873 04 19 45.18 +30 27 25.5 1.2- 1.4- 098/CD 1991 08 12.33589 04 21 28.90 +30 27 39.8 0.1+ 0.4- 801/HO 1991 08 14.41998 04 35 26.79 +30 26 05.9 0.4+ 0.3- 657/VC 1991 08 14.42365 04 35 28.26 +30 26 05.8 0.4+ 0.0 657/VC 1991 08 15.76684 04 44 25.12 +30 22 11.8 0.7- 0.8- 894/ot 1991 08 15.97014 04 45 46.55 +30 21 23.5 ( 5.3+ 1.0-) 188/SH 1991 08 18.03681 04 59 24.76 +30 10 27.8 ( 3.5+ 5.6+) 589/SK 1991 08 18.04028 04 59 26.07 +30 10 26.3 ( 2.9+ 5.4+) 589/SK 1991 08 18.04375 04 59 27.37 +30 10 24.8 ( 2.0+ 5.2+) 589/SK 1991 08 18.04722 04 59 28.67 +30 10 23.1 ( 1.2+ 4.8+) 589/SK 1991 08 18.05069 04 59 30.01 +30 10 21.6 ( 0.9+ 4.6+) 589/SK 1991 08 18.05417 04 59 31.31 +30 10 20.0 ( 0.1+ 4.2+) 589/SK 1991 08 18.05764 04 59 32.61 +30 10 18.6 ( 0.7- 4.1+) 589/SK 1991 08 18.06111 04 59 33.91 +30 10 16.8 ( 1.5- 3.6+) 589/SK 1991 08 19.04514 05 06 00.07 +30 03 10.5 ( 4.0+ 2.2+) 589/SK 1991 08 19.04861 05 06 01.36 +30 03 08.6 ( 3.1+ 1.8+) 589/SK 1991 08 19.05208 05 06 02.68 +30 03 06.6 ( 2.7+ 1.4+) 589/SK 1991 08 19.05555 05 06 03.96 +30 03 04.3 1.8+ 0.6+ 589/SK 1991 08 19.05903 05 06 05.28 +30 03 02.6 1.3+ 0.4+ 589/SK 1991 08 19.06250 05 06 06.56 +30 03 00.7 0.4+ 0.1+ 589/SK 1991 08 19.06597 05 06 07.87 +30 02 58.4 0.1- 0.7- 589/SK 1991 08 19.06944 05 06 09.17 +30 02 56.4 0.8- 1.2- 589/SK 1991 08 20.62894 05 16 14.37 +29 49 30.9 0.4+ 0.5+ 568/MK 1991 09 05.42597 06 48 44.23 +25 27 15.6 0.1+ 0.0 657/VC 1991 09 05.42933 06 48 45.30 +25 27 11.1 0.4+ 0.2- 657/VC 1991 09 06.12666 06 52 22.07 +25 11 53.0 1.9- 1.1- 046/KL 1991 09 06.12874 06 52 22.71 +25 11 52.1 1.9- 0.7+ 046/KL 1991 09 08.14605 07 02 37.05 +24 26 27.7 1.4+ 0.5- 503/CX 1991 09 08.39343 07 03 50.90 +24 20 50.2 0.6+ 0.2- 801/HO - continued - P/Hartley 2 NK 565 - 3 Date/ UT R.A. (2000) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1991 09 08.39461 07 03 51.25 +24 20 48.6 0.6+ 0.2- 801/HO 1991 09 09.38061 07 08 42.84 +23 58 02.1 0.1- 0.0 801/HO 1991 09 09.38144 07 08 43.09 +23 58 01.2 0.0 0.2+ 801/HO 1991 09 09.73819 07 10 27.29 +23 49 44.5 ( 3.8- 2.4+) 897/kj 1991 09 09.75677 07 10 32.67 +23 49 17.5 ( 4.0- 1.1+) 897/kj 1991 09 09.77622 07 10 38.39 +23 48 50.2 ( 2.8- 0.7+) 897/kj 1991 09 10.05183 07 11 58.65 +23 42 19.1 0.7- 0.5- 046/KL 1991 09 10.05374 07 11 59.24 +23 42 16.6 0.2- 0.3- 046/KL 1991 09 10.09448 07 12 10.99 +23 41 18.8 0.7- 1.5- 046/KL 1991 09 10.09616 07 12 11.58 +23 41 16.7 0.8+ 1.3- 046/KL 1991 09 11.76354 07 20 08.23 +23 01 52.7 0.9- 0.4+ 372/sk 1991 09 11.77313 07 20 11.08 +23 01 38.4 1.3+ 0.3- 372/sk 1991 09 12.39324 07 23 04.74 +22 46 47.4 0.4+ 0.2- 801/HO 1991 09 12.39439 07 23 05.06 +22 46 45.7 0.5+ 0.2- 801/HO 1991 09 13.38914 07 27 40.25 +22 22 47.2 0.6+ 0.2- 801/HO 1991 09 19.17796 07 52 53.52 +20 00 29.5 0.5- 1.1- 978/gw 1991 09 19.18108 07 52 54.28 +20 00 24.6 0.6- 1.4- 978/gw 1991 09 19.74635 07 55 14.67 +19 46 26.7 0.7+ 1.4+ 900/ir 1991 09 19.76574 07 55 19.27 +19 45 56.1 1.6- 0.6- 900/ir 1991 09 20.12252 07 56 46.79 +19 37 00.5 ( 2.9- 1.6-) 503/CX 1991 10 02.80499 08 43 35.80 +14 24 11.5 0.6- 0.9+ 411/kb 1991 10 02.80609 08 43 35.94 +14 24 10.0 1.8- 1.0+ 411/kb 1991 10 07.39583 08 58 19.86 +12 34 37.4 1.0+ 0.3- 293/h3 1991 10 07.40000 08 58 20.64 +12 34 31.7 1.2+ 0.1- 293/h3 1991 10 07.40936 08 58 22.29 +12 34 18.4 0.6+ 0.0 801/HO 1991 10 07.41074 08 58 22.55 +12 34 16.8 0.7+ 0.4+ 801/HO 1991 10 08.41191 09 01 26.85 +12 10 46.9 0.7+ 0.5- 801/HO 1991 11 03.43186 10 06 08.24 +03 03 22.5 0.8+ 0.5- 801/HO 1991 11 03.43685 10 06 08.81 +03 03 17.2 0.7+ 0.2- 801/HO 1991 11 04.79816 10 08 48.61 +02 38 17.6 1.0- 1.1+ 411/kb 1991 11 04.80100 10 08 48.91 +02 38 14.1 1.3- 0.8+ 411/kb 1991 11 04.80150 10 08 49.06 +02 38 10.3 ( 0.1+ 2.5-) 411/kb 1991 11 04.80208 10 08 48.95 +02 38 10.4 ( 2.6- 1.8-) 411/kb 1991 11 04.80455 10 08 49.33 +02 38 08.3 1.1- 1.2- 411/kb 1991 11 06.42574 10 11 54.34 +02 08 49.8 0.3+ 0.4- 801/HO 1991 11 06.43012 10 11 54.83 +02 08 45.0 0.4+ 0.5- 801/HO 1991 11 09.80984 10 18 02.35 +01 09 23.7 0.3+ 0.5- 900/ir 1991 11 09.81904 10 18 03.34 +01 09 16.4 0.9+ 1.7+ 900/ir 1991 11 10.79491 10 19 44.84 +00 52 33.2 0.4+ 0.8+ 411/kb 1991 11 10.79856 10 19 45.15 +00 52 28.0 0.5- 0.6- 411/kb 1991 11 10.79939 10 19 45.27 +00 52 27.5 0.0 0.3- 411/kb 1991 11 10.80174 10 19 45.58 +00 52 25.0 1.1+ 0.4- 411/kb 1991 11 20.79871 10 35 08.76 -01 47 16.8 0.2+ 0.1+ 411/kb 1991 11 20.80126 10 35 08.94 -01 47 19.1 0.1- 0.1+ 411/kb 1991 11 20.80328 10 35 09.11 -01 47 21.9 0.0 0.9- 411/kb 1991 11 20.80471 10 35 09.20 -01 47 21.4 0.3- 0.9+ 411/kb 1991 11 20.80664 10 35 09.41 -01 47 24.8 0.5+ 0.8- 411/kb 1991 11 20.81275 10 35 09.83 -01 47 28.6 0.5- 0.9+ 411/kb 1991 11 20.81606 10 35 10.09 -01 47 33.1 0.5- 0.7- 411/kb 1991 12 06.81459 10 52 20.50 -05 18 33.4 1.2- 0.9+ 411/kb - continued - P/Hartley 2 NK 565 - 4 Date/ UT R.A. (2000) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1991 12 06.81804 10 52 20.61 -05 18 36.1 1.8- 0.6+ 411/kb 1991 12 06.81988 10 52 20.75 -05 18 37.6 0.9- 0.4+ 411/kb 1991 12 06.82172 10 52 20.82 -05 18 38.7 1.1- 0.5+ 411/kb 1991 12 06.82334 10 52 20.81 -05 18 40.4 2.3- 0.1- 411/kb 1991 12 19.84187 10 59 06.49 -07 25 39.1 1.1+ 1.4- 411/kb 1991 12 19.84405 10 59 06.55 -07 25 37.8 1.6+ 1.0+ 411/kb 1991 12 19.84541 10 59 06.47 -07 25 38.2 0.1+ 1.2+ 411/kb 1991 12 19.84642 10 59 06.61 -07 25 40.1 2.0+ 0.2- 411/kb 1991 12 19.84825 10 59 06.47 -07 25 41.1 0.4- 0.3- 411/kb 1991 12 19.84918 10 59 06.55 -07 25 40.5 0.6+ 0.8+ 411/kb ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1991 December 24