OAA computing section circular NK 526 Periodic Comet Giclas
The following improved orbital elements, by S. Nakano, are from 81 observations 1978 to 1986. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.16 arc seconds. Epoch = 1985 Sept.12.0 ET T = 1985 Oct. 1.23490 +/- 0.00037 (m.e.) ET Peri. = 276.31667 +/- 0.00058 Node = 111.94344 +/- 0.00049 (1950.0) Inc. = 7.29052 +/- 0.00003 q = 1.8377497 +/- 0.0000038 AU e = 0.4945627 +/- 0.0000011 a = 3.6359595 +/- 0.0000019 AU nß = 0.14215938 +/- 0.00000011 P = 6.933 +/- 0.0000055 years T = 1978 Nov. 21.15947 ET Epoch = 1978 Nov. 28.0 ET Peri. = 247.18575 e = 0.5114584 Node = 141.54592 (1950.0) a = 3.5448325 AU Inc. = 8.54481 nß= 0.14767619 q = 1.7317983 AU P = 6.674 years The predicted orbit for the 1992 return is as follows: T = 1992 Sept.13.09190 ET Epoch = 1992 Sept.15.0 ET Peri. = 276.44052 e = 0.4932117 Node = 111.87256 (1950.0) a = 3.6441151 AU Inc. = 7.28646 nß= 0.14168241 q = 1.8467947 AU P = 6.956 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 ¡ , " " " 1978 09 03.32986 00 08 30.64 -08 04 25.1 ( 0.6- 5.3-) 688/LO 1978 09 08.30208 00 08 14.0 -08 59 48 0.8+ 2.4- 688/LO Y 1978 09 10.33750 00 07 58.69 -09 23 09.4 1.7+ 2.0- 688/LO 1978 09 11.34722 00 07 49.31 -09 34 48.3 0.8- 0.5- 688/LO 1978 09 12.36736 00 07 39.07 -09 46 38.8 1.0+ 1.0- 688/LO 1978 09 13.72153 00 07 23.92 -10 02 09.9 0.1+ 0.9+ 323/PR 1978 09 13.73681 00 07 23.81 -10 02 21.5 1.9+ 0.1- 323/PR 1978 09 14.32358 00 07 16.65 -10 09 22.1 ( 3.1+ 0.3+) 801/HO 1978 09 16.76736 00 06 43.91 -10 37 37.9 ( 1.8- 3.1+) 372/sk 1978 09 16.77882 00 06 44.01 -10 37 38.8 0.5+ 0.7- 323/PR - continued - P/Giclas NK 526 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1978 09 16.80104 00 06 43.55 -10 37 53.5 0.6- 0.1- 323/PR 1978 09 21.71667 00 05 27.33 -11 33 44.9 0.8+ 0.9- 323/PR 1978 09 22.62083 00 05 12.35 -11 43 39.9 ( 0.0 3.2+) 323/PR 1978 09 23.23056 00 05 01.83 -11 50 35.7 2.0- 1.2- 688/LO 1978 09 24.20906 00 04 44.68 -12 00 57.0 0.2+ 0.6+ 805/EL 1978 09 24.59144 00 04 38.35 -12 05 02.6 0.0 0.2+ 323/PR 1978 09 24.71458 00 04 35.97 -12 06 32.1 2.1- 1.9+ 210/AA 1978 09 24.73541 00 04 35.74 -12 06 45.0 0.9+ 2.4+ 210/AA 1978 09 24.86779 00 04 33.50 -12 08 13.6 0.5+ 1.5- 046/KL 1978 09 24.88307 00 04 33.06 -12 08 23.7 1.4- 1.8- 046/KL 1978 09 25.55747 00 04 21.63 -12 15 14.0 1.8+ 1.2+ 323/PR 1978 09 25.87249 00 04 15.68 -12 18 46.0 1.6- 0.1- 046/KL 1978 09 25.88736 00 04 15.43 -12 18 55.0 0.8- 0.3+ 046/KL 1978 09 26.15661 00 04 10.62 -12 21 42.1 0.6- 0.4+ 801/HO 1978 09 27.26319 00 03 51.20 -12 33 03.2 0.1+ 1.7- 688/LO 1978 09 27.32658 00 03 49.54 -12 33 26.3 1.0+ 1.4+ 805/EL 1978 09 29.28789 00 03 15.38 -12 52 48.6 0.7+ 1.6+ 805/EL 1978 09 30.29306 00 02 58.56 -13 02 35.4 1.0+ 0.2+ 688/LO 1978 09 30.59896 00 02 53.28 -13 05 26.7 1.2- 0.0 372/sk 1978 09 30.61632 00 02 52.96 -13 05 33.2 ( 0.6- 3.1+) 372/sk 1978 10 02.52118 00 02 21.97 -13 22 45.7 0.7+ 1.1+ 885/ur 1978 10 03.70486 00 02 02.88 -13 32 43.3 0.1+ 0.2- 323/PR 1978 10 07.19144 00 01 13.90 -13 59 55.7 0.4+ 0.8- 805/EL 1978 10 07.30764 00 01 12.45 -14 00 59.1 0.8+ 2.5- 688/LO 1978 10 08.22340 00 01 01.32 -14 07 09.6 2.1+ 0.1- 805/EL 1978 10 08.57297 00 00 57.37 -14 09 42.1 0.6- 1.2+ 885/ur 1978 10 08.93003 00 00 53.34 -14 12 06.4 0.7- 0.6+ 046/KL 1978 10 08.94497 00 00 53.16 -14 12 12.4 0.3- 0.5+ 046/KL 1978 10 09.22584 00 00 49.94 -14 13 50.4 0.2- 0.8- 805/EL 1978 10 09.24598 00 00 49.71 -14 13 55.9 0.5+ 1.4+ 805/EL 1978 10 09.92669 00 00 42.83 -14 18 29.6 2.3- 0.3- 046/KL 1978 10 09.94122 00 00 42.66 -14 18 34.9 2.0- 0.2- 046/KL 1978 10 10.28403 00 00 39.54 -14 20 37.4 0.2+ 1.9+ 675/PL 1978 10 10.32500 00 00 39.05 -14 20 57.3 ( 1.7+ 3.0-) 688/LO 1978 10 23.47292 00 00 32.22 -15 06 09.0 0.9+ 0.7+ 372/sk 1978 10 23.55104 00 00 32.62 -15 06 16.6 ( 0.2- 3.2-) 372/sk 1978 10 23.58681 00 00 33.07 -15 06 03.7 0.6+ 0.6+ 323/PR 1978 10 27.59861 00 01 26.48 -15 05 35.6 0.1- 0.4- 323/PR 1978 10 28.18542 00 01 37.07 -15 05 11.5 ( 2.5+ 3.1-) 688/LO 1978 11 01.15608 00 03 02.66 -14 57 17.5 0.8- 0.0 801/HO 1978 11 04.27472 00 04 30.84 -14 46 33.9 0.1+ 0.7+ 805/EL 1978 11 05.66296 00 05 16.28 -14 40 43.2 0.5- 0.8+ 323/PR 1978 11 20.12795 00 16 37.05 -13 00 53.5 0.5- 0.7- 801/HO 1978 11 20.15417 00 16 38.99 -13 00 40.5 1.8+ 2.6- 688/LO 1978 11 20.62674 00 17 06.70 -12 56 07.1 2.2- 0.4+ 323/PR 1978 12 20.54358 00 57 20.95 -06 44 58.5 ( 3.5- 0.1-) 323/PR 1978 12 27.15833 01 08 23.88 -05 06 25.3 ( 1.1+ 4.6-) 688/LO 1978 12 27.43542 01 08 52.14 -05 01 59.4 1.7- 0.3+ 474/JN 1978 12 27.45709 01 08 54.51 -05 01 37.9 0.8+ 2.0+ 474/JN 1978 12 29.53958 01 12 30.94 -04 29 53.1 1.4+ 1.8+ 323/PR - continued - P/Giclas NK 526 - 3 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1979 01 24.11667 02 00 25.12 +02 07 06.5 ( 0.9+ 4.6-) 688/LO 1979 02 23.03741 03 02 04.05 +09 14 48.7 0.8- 0.7+ 801/HO 1979 03 28.03113 04 13 28.62 +15 13 38.1 0.9- 2.8+ 801/HO 1985 06 22.38646 00 53 11.05 -00 36 55.6 ( 3.8- 4.5-) 707/ev 1985 07 18.30242 01 43 07.71 +02 36 51.6 ( 0.7- 6.9+) 801/HO 1985 07 21.30067 01 48 45.37 +02 55 06.1 2.5- 0.3+ 801/HO 1985 07 22.75694 01 51 28.46 +03 03 39.4 0.5- 0.4- 372/sk 1985 07 22.77083 01 51 29.68 +03 03 42.5 ( 5.2- 2.1-) 372/sk 1985 08 10.39236 02 24 48.62 +04 30 41.9 0.9- 0.4+ 662/LI 1985 08 11.40417 02 26 31.24 +04 34 09.0 1.6- 0.7+ 662/LI 1985 09 12.33185 03 11 21.52 +05 11 01.8 1.1+ 0.2+ 801/HO 1985 09 14.37847 03 13 25.35 +05 08 56.9 0.2- 1.3+ 707/ev 1985 09 17.38015 03 16 13.03 +05 05 01.5 0.3+ 0.1+ 801/HO 1985 10 16.31568 03 27 35.15 +04 01 38.1 0.1+ 0.0 801/HO 1985 10 18.00625 03 27 20.89 +03 58 08.4 0.8+ 0.1- 552/SV 1985 10 18.02014 03 27 20.66 +03 58 07.4 0.1+ 0.5+ 552/SV 1985 10 20.33056 03 26 52.06 +03 53 48.6 0.5+ 2.5+ 707/ev 1985 11 09.14840 03 17 37.28 +03 47 30.0 1.5+ 0.1- 801/HO 1985 11 09.39375 03 17 27.51 +03 47 51.6 1.2- 1.1- 293/h3 1985 11 09.40833 03 17 26.75 +03 47 51.3 ( 4.3- 2.8-) 293/h3 1985 11 13.41744 03 14 59.38 +03 55 58.8 ( 4.4- 5.7+) 657/VC 1985 11 19.59583 03 11 19.64 +04 15 29.2 ( 3.9+ 0.7+) 323/PR 1985 12 02.62014 03 05 21.92 +05 23 17.8 2.3+ 2.6- 323/PR 1985 12 05.65556 03 04 30.54 +05 43 51.5 1.8- 0.5+ 323/PR 1985 12 05.85139 03 04 27.96 +05 45 02.7 2.3- 0.3+ 046/KL 1985 12 05.86563 03 04 27.84 +05 45 07.7 0.6- 0.7- 046/KL 1985 12 06.64722 03 04 17.15 +05 50 54.6 0.7- 1.3+ 323/PR 1985 12 09.25044 03 03 49.79 +06 09 55.3 0.7+ 0.4- 657/VC 1985 12 10.62431 03 03 39.72 +06 20 40.1 0.0 0.2- 323/PR 1985 12 14.11787 03 03 30.14 +06 48 35.4 2.0+ 1.1+ 688/LO 1985 12 14.15139 03 03 29.98 +06 48 50.5 0.7+ 0.5- 688/LO 1985 12 15.16458 03 03 31.28 +06 57 15.7 1.8+ 1.7- 688/LO 1985 12 15.17403 03 03 30.83 +06 57 22.2 0.7- 1.0+ 801/HO 1986 01 08.14861 03 12 54.32 +10 41 40.7 0.9+ 0.8- 688/LO 1986 01 09.08785 03 13 35.66 +10 50 58.7 0.0 0.1+ 801/HO 1986 01 19.21220 03 22 24.42 +12 31 18.5 1.0- 0.8- 691/ST 1986 01 19.22591 03 22 25.22 +12 31 26.3 0.8- 1.1- 691/ST 1986 01 19.23325 03 22 25.65 +12 31 30.7 0.7- 1.0- 691/ST ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1988 November 1