OAA computing section circular NK 459 Periodic Comet Giacobini-Zinner

1972 VI = 1979 III = 1984e The following improved orbital elements, by S. Nakano, are from 139 observations 1972 to 1984. Perturbations by Mercury to Pluto and non-gravitational effect of STYLE II were taken into account. The mean residual is +/- 1.16 arc seconds. The comet passed 1.61 AU from Jupiter on 1981 February and the comet will pass 0.47 AU from the earth on 1985 September: Epoch = 1985 Sept.12.0 ET T = 1985 Sept. 5.26653 +/- 0.00626 (m.e.) ET Peri. = 172.49050 +/- 0.00052 Node = 194.70569 +/- 0.00018 1950.0 Inc. = 31.87815 +/- 0.00009 q = 1.0282635 +/- 0.0000099 AU e = 0.7075369 +/- 0.0000021 a = 3.5158746 +/- 0.0000228 AU nß = 0.14950441 +/- 0.00000145 P = 6.592 +/- 0.0000641 years A1 = -0.251 +/- 0.050 A2 = -0.04081 +/- 0.00169 T = 1972 Aug. 4.88445 ET Epoch = 1972 July 22.0 ET Peri. = 171.90346 e = 0.7150908 Node = 195.13083 1950.0 a = 3.4888562 AU Inc. = 31.70906 nß= 0.15124446 q = 0.9940071 AU P = 6.517 years T = 1979 Feb. 12.77380 ET Epoch = 1979 Feb. 16.0 ET Peri. = 171.97355 e = 0.7146583 Node = 195.06912 1950.0 a = 3.4907093 AU Inc. = 31.69988 nß= 0.15112404 q = 0.9960450 AU P = 6.522 years m1 = 10.5 (k=15) m2 = 15.6 (k=5) There are the residuals, in seconds of arc (or sinbol 'm' in minutes of arc), from the above orbital elements in the next pages: - continued - Periodic Comet Giacobini-Zinner NK 459-2 Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1972 Mar. 11.46574 19 01 20.4 + 3 44 06 ( 3.4- 2.3+) 691/ST Y 11.50480 19 01 25.80 + 3 44 36.0 ( 5.4+ 1.7+) 691/ST Apr. 18.35980 20 27 25.33 +14 39 45.7 (10.8+ 4.8+) 774/WN May 14.33823 21 42 23.50 +24 50 54.1 ( 3.1- 1.2-) 801/HO 16.73681 21 50 27.90 +25 50 13.0 2.0- 1.6- 370/sk 16.75972 21 50 32.30 +25 50 46.0 ( 5.5- 2.8-) 370/sk 18.02000 21 54 53.74 +26 21 56.4 ( 7.4+ 4.0+) 046/KL 18.02640 21 54 55.33 +26 22 06.7 (10.9+ 4.8+) 046/KL 20.77917 22 04 38.70 +27 29 39.2 1.4+ 0.1- 370/sk June 3.96706 23 01 08.09 +32 56 56.8 0.4- 1.1+ 046/KL 3.97192 23 01 09.46 +32 57 01.9 0.7+ 0.0 046/KL 4.97517 23 05 35.88 +33 17 49.9 0.4- 1.1- 046/KL 4.97986 23 05 37.28 +33 17 56.1 1.4+ 0.8- 046/KL 5.95521 23 09 59.90 +33 37 45.0 0.3- 0.2- 046/KL 5.95937 23 10 01.09 +33 37 49.9 0.4+ 0.4- 046/KL 7.99861 23 19 22.05 +34 17 48.4 1.3- 0.5+ 056/SP 8.03125 23 19 31.26 +34 18 25.6 0.4+ 0.2- 056/SP 9.74427 23 27 35.11 +34 50 18.3 0.9- 0.4+ 370/sk 10.99792 23 33 36.74 +35 12 28.5 ( 3.5+ 0.2+) 056/SP 11.00486 23 33 38.54 +35 12 35.3 0.9+ 0.3- 056/SP 11.01111 23 33 40.38 +35 12 43.9 1.2+ 1.7+ 056/SP 14.65868 23 51 45.97 +36 11 32.0 1.2- 1.1- 370/sk 19.02474 0 14 30.78 +37 08 55.7 0.3- 0.6- 993/WL 19.98045 0 19 38.76 +37 19 22.0 1.6+ 0.1- 993/WL 20.99028 0 25 07.32 +37 29 31.9 0.4+ 0.6- 056/SP 20.99653 0 25 09.34 +37 29 36.1 0.1+ 0.1- 056/SP 21.00278 0 25 11.29 +37 29 42.3 0.9- 2.4+ 056/SP 21.01736 0 25 16.09 +37 29 49.4 0.4- 0.8+ 056/SP 21.02431 0 25 18.47 +37 29 54.1 0.9+ 1.4+ 056/SP 21.99097 0 30 36.25 +37 38 41.3 0.0 1.5+ 056/SP 21.99792 0 30 38.56 +37 38 43.8 0.2+ 0.2+ 056/SP 22.00694 0 30 41.38 +37 38 48.6 1.6- 0.2+ 056/SP 22.01319 0 30 43.66 +37 38 52.1 1.0+ 0.3+ 056/SP 22.01875 0 30 45.28 +37 38 54.7 1.5- 0.1- 056/SP 22.99375 0 36 09.01 +37 46 50.7 0.8- 0.2- 056/SP 22.99931 0 36 10.85 +37 46 55.3 0.9- 1.7+ 056/SP 23.00417 0 36 12.54 +37 46 57.2 0.1- 1.3+ 056/SP 23.01736 0 36 17.12 +37 47 04.1 2.2+ 1.8+ 056/SP July 1.71528 1 26 14.44 +38 13 50.7 2.7- 2.2- 370/sk 1.95986 1 27 41.09 +38 13 21.8 0.7+ 0.3+ 046/KL 1.96177 1 27 41.62 +38 13 19.3 1.0- 2.0- 046/KL 2.28874 1 29 37.24 +38 12 38.9 2.7- 1.5- 801/HO 4.00341 1 39 46.47 +38 06 46.6 0.8+ 0.2- 020/NI 4.01449 1 39 50.62 +38 06 43.8 3.2+ 0.3- 020/NI 4.95248 1 45 24.64 +38 02 00.7 1.2+ 0.6- 046/KL 4.95491 1 45 25.46 +38 02 00.1 0.7+ 0.4- 046/KL 4.97847 1 45 33.93 +38 01 52.7 1.3+ 0.8- 056/SP 5.00069 1 45 41.62 +38 01 44.9 1.5- 1.6- 056/SP 5.02153 1 45 49.25 +38 01 42.0 1.0+ 2.0+ 056/SP 5.02708 1 45 51.08 +38 01 36.5 0.7- 1.7- 056/SP - continued - Periodic Comet Giacobini-Zinner NK 459-3 Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1972 July 5.95957 1 51 24.05 +37 55 48.7 0.3+ 0.5- 046/KL 5.96166 1 51 24.66 +37 55 48.1 1.4- 0.3- 046/KL 6.96528 1 57 23.44 +37 48 23.8 0.3+ 1.4- 056/SP 6.98611 1 57 30.98 +37 48 13.6 1.4+ 2.1- 056/SP 7.96779 2 03 21.85 +37 39 49.2 0.9+ 0.2- 046/KL 8.06382 2 03 56.31 +37 38 58.5 2.0+ 0.0 020/NI 8.07940 2 04 02.03 +37 38 49.7 ( 4.0+ 0.5-) 020/NI 8.98697 2 09 26.06 +37 29 51.5 0.9+ 0.0 046/KL 8.98905 2 09 26.68 +37 29 50.1 0.6- 0.2- 046/KL 9.97708 2 15 19.53 +37 18 58.8 1.2+ 0.0 056/SP 9.98383 2 15 21.85 +37 18 52.4 0.2+ 1.5- 046/KL 9.98557 2 15 22.48 +37 18 52.0 0.3+ 0.7- 046/KL 9.99097 2 15 24.40 +37 18 49.1 0.2+ 0.3- 056/SP 10.00486 2 15 29.43 +37 18 39.4 1.1+ 0.7- 056/SP 10.01875 2 15 34.22 +37 18 30.5 0.8- 0.2- 056/SP 12.00181 2 27 20.18 +36 53 01.6 ( 1.6+ 2.8-) 993/WL 13.11838 2 33 13.58 +36 48 24.3 ( 8.5- 11.6+)m 020/NI 16.03335 2 50 59.01 +35 47 22.9 (11.7- 7.0+) 993/WL 16.99201 2 56 33.57 +35 28 54.6 0.9+ 0.2+ 046/KL 16.99410 2 56 34.30 +35 28 52.8 0.9+ 0.8+ 046/KL 18.08054 3 02 50.03 +35 06 52.9 2.2+ 0.4+ 020/NI 18.08816 3 02 52.62 +35 06 43.1 1.9+ 0.0 020/NI 18.10132 3 02 57.27 +35 06 26.0 ( 3.5+ 0.9-) 020/NI 18.77431 3 06 48.26 +34 52 11.3 0.0 0.1+ 380/kj 20.02500 3 13 55.17 +34 24 17.2 0.9+ 1.3- 056/SP 20.03333 3 13 57.84 +34 24 06.8 1.0- 0.5- 056/SP 20.03819 3 13 59.47 +34 24 00.5 1.3- 0.2- 056/SP 20.04514 3 14 01.94 +34 23 51.9 0.2+ 0.6+ 056/SP 20.99514 3 19 23.45 +34 01 38.6 0.6+ 1.5+ 056/SP 21.02708 3 19 34.11 +34 00 51.2 0.6- 0.9- 056/SP 21.03611 3 19 37.19 +34 00 39.3 0.1- 0.0 056/SP 21.78854 3 23 50.17 +33 42 27.0 2.4+ 0.1- 370/sk 22.01458 3 25 05.59 +33 36 46.2 0.1+ 1.4- 056/SP 22.04375 3 25 15.43 +33 36 04.2 1.5+ 0.5- 056/SP 22.04931 3 25 17.19 +33 35 54.9 0.3+ 1.6- 056/SP 24.02569 3 37 12.99 +32 44 56.1 (12.9+ 0.0+)m 056/SP 24.04167 3 36 16.79 +32 44 29.0 1.5- 0.9- 056/SP 24.05625 3 36 21.68 +32 44 07.1 0.0 0.3+ 056/SP 26.03889 3 47 05.78 +31 49 23.6 0.2- 0.7+ 056/SP 26.04375 3 47 07.24 +31 49 16.8 1.5- 2.0+ 056/SP Aug. 3.80382 4 31 50.42 +27 12 41.8 0.0 0.2- 370/sk 9.48160 4 58 18.63 +23 51 28.2 0.8+ 1.2+ 693/CT 9.89135 5 00 08.36 +23 36 27.5 2.4- 1.1+ 210/AA 9.90795 5 00 12.85 +23 35 50.6 1.6- 0.4+ 210/AA 9.93417 5 00 19.93 +23 34 53.8 0.3- 0.7+ 210/AA 10.89836 5 04 36.23 +22 59 27.0 1.9+ 0.7- 210/AA 10.91485 5 04 40.40 +22 58 50.6 0.4- 0.9- 210/AA 11.81488 5 08 35.85 +22 25 38.9 ( 6.2- 1.3+) 370/sk 11.86741 5 08 49.93 +22 23 37.2 1.4- 0.6- 210/AA 11.89138 5 08 56.37 +22 22 36.5 ( 1.5+ 8.4-) 210/AA - continued - Periodic Comet Giacobini-Zinner NK 459-4 Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1972 Aug. 11.90526 5 08 59.76 +22 22 12.2 1.4- 2.0- 210/AA 12.07731 5 09 44.45 +22 15 50.8 0.9- 1.1+ 993/WL 12.87674 5 13 10.64 +21 46 08.8 ( 2.9- 2.5+) 210/AA 12.90694 5 13 18.50 +21 44 59.8 1.1- 0.6+ 210/AA 13.77813 5 17 01.01 +21 12 29.3 ( 5.1+ 1.3+) 370/sk 13.92161 5 17 36.84 +21 07 01.4 ( 1.0- 2.8-) 210/AA 13.93317 5 17 39.72 +21 06 38.2 1.4- 0.2- 210/AA 14.07965 5 18 16.79 +21 01 08.7 0.1+ 0.7+ 046/KL 14.08174 5 18 17.38 +21 01 03.6 1.0+ 0.2+ 046/KL 14.92819 5 21 49.64 +20 29 19.1 1.8+ 1.3+ 210/AA 15.78299 5 25 21.11 +19 57 10.2 1.3- 1.7+ 380/kj 15.79340 5 25 23.78 +19 56 43.8 0.5+ 1.3- 380/kj 15.92925 5 25 57.08 +19 51 35.3 0.8- 1.0- 210/AA 18.88610 5 37 48.07 +17 59 45.8 ( 0.3+ 2.7-) 191/DS 18.92395 5 37 56.84 +17 58 24.5 1.4- 1.5+ 191/DS 21.94312 5 49 31.28 +16 04 03.6 2.1- 0.0 191/DS 21.95574 5 49 34.42 +16 03 33.5 2.5+ 1.5- 191/DS 22.91443 5 53 08.47 +15 27 17.7 0.7+ 2.5- 191/DS 22.95259 5 53 16.64 +15 25 53.2 ( 3.0- 0.9-) 191/DS 29.93045 6 17 46.67 +11 04 56.1 ( 3.7+ 0.5+) 191/DS 29.93598 6 17 47.65 +11 04 41.5 2.0+ 1.9- 191/DS 31.94598 6 24 23.16 + 9 50 52.5 0.7+ 1.4- 191/DS Sept. 1.07292 6 24 47.77 + 9 46 14.6 2.0+ 0.2+ 056/SP 1.08056 6 24 49.04 + 9 45 57.6 1.0- 0.1- 056/SP 1.09444 6 24 51.71 + 9 45 27.2 1.0- 0.2- 056/SP 1.09931 6 24 52.78 + 9 45 15.9 1.0+ 0.9- 056/SP 3.08750 6 31 11.31 + 8 33 04.4 2.1- 0.1- 056/SP 3.09653 6 31 13.06 + 8 32 44.4 1.1- 0.6- 056/SP 3.10278 6 31 14.21 + 8 32 30.6 1.3- 0.9- 056/SP 4.08958 6 34 17.89 + 7 56 59.4 1.5- 0.3- 056/SP 4.09792 6 34 19.81 + 7 56 44.8 ( 4.2+ 3.0+) 056/SP 4.47431 6 35 29.13 + 7 43 14.5 ( 3.2+ 0.4+) 693/CT 4.47986 6 35 30.13 + 7 43 02.6 ( 3.1+ 0.4+) 693/CT 5.81169 6 39 31.91 + 6 55 32.3 0.2- 0.0 370/sk 12.80174 6 59 21.96 + 2 53 12.4 1.3+ 1.0- 370/sk 16.78333 7 09 41.77 + 0 40 47.0 0.0 1.0+ 370/sk 18.76458 7 14 35.22 - 0 23 37.6 0.5+ 2.0- 380/kj 18.77745 7 14 36.97 - 0 23 58.5 1.0- 2.0+ 385/ur 18.78581 7 14 38.20 - 0 24 16.6 0.6- 0.1+ 385/ur 20.80833 7 19 27.48 - 1 28 54.0 1.3- 0.1- 380/kj 20.81701 7 19 28.95 - 1 29 11.4 2.4+ 1.1- 370/sk Oct. 1.81910 7 42 50.78 - 7 02 11.9 1.2- 2.3+ 370/sk 4.82118 7 48 24.19 - 8 27 55.2 0.8+ 1.0- 370/sk 6.83750 7 51 56.17 - 9 24 12.3 0.3- 1.4+ 370/sk 12.83542 8 01 31.65 -12 06 06.5 2.1+ 0.1+ 370/sk Nov. 1.81667 8 23 26.61 -20 06 16.4 ( 2.6+ 2.4+) 370/sk 4.12226 8 24 57.45 -20 55 58.0 ( 4.9+ 5.5-) 020/NI 4.83507 8 25 22.43 -21 10 49.2 ( 1.9+ 6.7+) 879/fr 8.12396 8 27 02.84 -22 18 48.8 1.1- 1.4- 056/SP 8.15208 8 27 03.63 -22 19 17.1 ( 0.3+ 4.5+) 056/SP - continued - Periodic Comet Giacobini-Zinner NK 459-5 Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1972 Nov. 8.82014 8 27 20.83 -22 32 44.5 ( 1.9+ 2.7+) 380/kj 12.84132 8 28 39.62 -23 51 10.3 1.6+ 0.5- 370/sk 13.93734 8 28 54.20 -24 11 44.6 2.0+ 0.6+ 191/DS 14.92201 8 29 04.41 -24 29 56.2 0.4+ 1.2+ 191/DS 15.93240 8 29 12.31 -24 48 20.4 0.4- 0.2+ 191/DS Dec. 2.75208 8 25 02.44 -29 05 00.9 ( 1.8- 3.5+) 380/kj 2.81424 8 25 00.25 -29 05 50.4 1.0+ 0.9- 380/kj 4.75833 8 23 45.80 -29 28 27.0 ( 5.1+ 5.3+) 370/sk 1973 Feb. 6.24236 7 13 20.23 -24 34 53.2 ( 4.2+ 3.1-) 693/CT 27.04491 7 06 40.18 -18 33 19.5 ( 4.3+ 4.7-) 821/AL 27.07546 7 06 40.10 -18 32 46.7 ( 4.0+ 3.2-) 821/AL 1978 Apr. 30.26185 16 03.0 + 7 55 (73.8- 36.4-) 801/HO X May 1.26075 16 02 19.45 + 8 07 16.9 0.6- 0.6- 801/HO 12.24468 15 52 53.93 +10 10 13.9 0.8- 0.8- 801/HO June 6.21150 15 27 49.79 +13 33 19.2 0.2- 0.3- 801/HO July 1.17638 15 07 49.72 +14 20 49.3 1.5+ 1.8+ 801/HO Oct. 3.02947 16 01 20.95 + 3 48 56.6 0.3+ 1.0+ 801/HO 1984 Jan. 28.33334 14 51 10.91 - 6 23 27.0 0.4+ 2.9- 809/we Mar. 29.29604 14 49 19.50 - 1 34 22.7 ( 0.9- 3.6+) 695/KP Apr. 3.40762 14 46 44.26 - 0 58 26.6 0.9+ 0.6- 695/KP 3.41218 14 46 44.13 - 0 58 25.4 1.2+ 1.4- 695/KP 3.41566 14 46 43.99 - 0 58 23.6 0.8+ 1.1- 695/KP 3.41913 14 46 43.89 - 0 58 22.3 1.0+ 1.2- 695/KP July 21.02708 13 57 31.56 + 4 43 48.1 1.7- 0.8+ 807/CE 3 21.08958 13 57 32.28 + 4 43 38.2 0.9- 0.4+ 807/CE 22.01389 13 57 42.83 + 4 41 18.9 ( 5.5- 3.3+) 807/CE 22.05556 13 57 43.47 + 4 41 10.3 3.1- 1.2+ 807/CE ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1984 November 15

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