OAA computing section circular NK 502 Periodic Comet Clark 1973 V = 1978 XXIII = 1984 VIII
The following improved orbital elements, by S. Nakano, are from 78 observations 1973 to 1984. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.44 arc seconds: Epoch = 1984 May 20.0 ET T = 1984 May 29.04086 +/- 0.00111 (m.e.) ET Peri. = 209.00370 +/- 0.00145 Node = 59.07582 +/- 0.00137 (1950.0) Inc. = 9.50508 +/- 0.00035 q = 1.5511934 +/- 0.0000047 AU e = 0.5023430 +/- 0.0000013 a = 3.1169931 +/- 0.0000047 AU n_ = 0.17910195 +/- 0.00000001 P = 5.503 +/- 0.0000126 years A1 = +1.410 +/- 0.063 A2 = +0.01516 +/- 0.00418 T = 1973 May 24.88489 ET Epoch = 1973 June 7.0 ET Peri. = 209.13336 e = 0.5003215 Node = 59.12896 (1950.0) a = 3.1227648 AU Inc. = 9.50054 n_= 0.17860564 q = 1.5603785 AU P = 5.518 years T = 1978 Nov. 26.27778 ET Epoch = 1978 Nov. 28.0 ET Peri. = 209.04367 e = 0.5009160 Node = 59.07847 (1950.0) a = 3.1198640 AU Inc. = 9.49907 n_= 0.17885479 q = 1.5570743 AU P = 5.511 years The predicted orbit for the 1989 return is as follows: T = 1989 Nov. 28.41038 ET Epoch = 1989 Nov. 10.0 ET Peri. = 208.92499 e = 0.5013221 Node = 59.05962 (1950.0) a = 3.1199069 AU Inc. = 9.49779 n_= 0.17885110 q = 1.5558286 AU P = 5.511 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 ! , " " " 1973 06 01.69722 20 39 27.91 -30 04 05.5 0.6- 1.0+ 474/JN 1973 06 10.66666 20 53 33.55 -31 34 23.1 2.8+ 1.9- 474/JN 1973 06 11.64644 20 54 54.08 -31 44 41.3 0.2+ 2.6+ 485/CA 1973 06 12.48097 20 56 01.50 -31 53 34.5 0.4+ 0.5+ 485/CA 1973 06 17.58206 21 02 09.90 -32 49 15.9 1.5+ 0.6+ 485/CA 1973 06 20.60069 21 05 14.39 -33 23 00.2 1.8+ 0.3+ 485/CA 1973 06 28.28713 21 11 04.49 -34 49 55.3 0.5+ 0.9- 821/AL 1973 06 28.28852 21 11 04.53 -34 49 56.1 0.5+ 0.8- 821/AL 1973 06 28.28991 21 11 04.60 -34 49 57.0 0.9+ 0.7- 821/AL 1973 06 28.29130 21 11 04.58 -34 49 58.3 0.2+ 1.1- 821/AL - continued - P/Clark NK 502 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1973 06 28.29269 21 11 04.68 -34 50 00.2 0.9+ 2.1- 821/AL 1973 06 28.29546 21 11 04.75 -34 50 01.0 0.8+ 1.0- 821/AL 1973 06 28.29685 21 11 04.74 -34 50 02.0 0.2+ 1.1- 821/AL 1973 06 28.29824 21 11 04.79 -34 50 02.7 0.3+ 0.8- 821/AL 1973 06 28.29963 21 11 04.87 -34 50 04.2 0.8+ 1.4- 821/AL 1973 06 28.30102 21 11 04.89 -34 50 04.9 0.6+ 1.1- 821/AL 1973 06 28.58817 21 11 14.81 -34 53 14.0 0.1+ 0.3+ 474/JN 1973 06 28.64451 21 11 16.35 -34 53 53.8 0.6- 1.3- 474/JN 1973 06 28.66258 21 11 16.82 -34 54 05.9 1.0- 1.2- 474/JN 1973 06 29.51684 21 11 44.72 -35 03 39.5 0.8+ 1.9- 474/JN 1973 06 30.49219 21 12 13.07 -35 14 30.7 0.6+ 1.1- 474/JN 1973 06 30.58704 21 12 15.26 -35 15 35.5 0.2+ 0.8- 474/JN 1973 07 01.51219 21 12 39.42 -35 25 49.5 1.1- 1.6- 474/JN 1973 07 01.61313 21 12 41.56 -35 26 57.4 0.4+ 1.2- 474/JN 1973 07 01.87639 21 12 48.86 -35 29 49.8 ( 4.3+ 1.6+) 076/HB 1973 07 01.89653 21 12 49.09 -35 30 01.9 ( 2.3+ 3.4+) 076/HB 1973 07 02.55455 21 13 03.31 -35 37 16.5 0.0 1.0- 474/JN 1973 07 02.60189 21 13 04.08 -35 37 48.0 0.3- 0.9- 474/JN 1973 07 03.41111 21 13 19.62 -35 46 35.8 0.6- 0.6+ 808/YS 1973 07 03.51736 21 13 22.83 -35 47 44.2 0.7+ 0.5- 485/CA 1973 07 03.53056 21 13 23.06 -35 47 52.9 1.2+ 0.3- 485/CA 1973 07 03.56210 21 13 23.43 -35 48 14.0 0.2- 1.3- 474/JN 1973 07 04.56724 21 13 40.69 -35 59 01.6 0.7+ 0.6- 474/JN 1973 07 04.92708 21 13 46.52 -36 02 54.3 1.9+ 0.1+ 076/HB 1973 07 04.94861 21 13 46.64 -36 03 09.0 0.9+ 0.4- 076/HB 1973 07 09.43264 21 14 23.80 -36 49 21.1 0.8- 2.4- 688/LO 1973 07 10.42153 21 14 25.03 -36 58 57.6 0.8- 1.4- 688/LO 1973 07 27.6867 21 09 15.67 -39 01 02.0 ( 3.4- 1.8-) 413/SS 1973 07 28.6590 21 08 45.51 -39 04 41.4 ( 3.2- 0.0 ) 413/SS 1973 08 01.90139 21 06 28.18 -39 16 06.0 0.3+ 0.7+ 076/HB 1973 08 01.94931 21 06 26.09 -39 16 11.8 2.2- 0.2+ 076/HB 1973 08 07.28611 21 03 30.78 -39 19 28.5 0.8- 0.2+ 808/YS 1973 08 21.80972 20 57 33.99 -38 31 24.7 0.4+ 0.0 076/HB 1973 08 21.86042 20 57 33.03 -38 31 06.7 0.8+ 0.7+ 076/HB 1973 08 23.13510 20 57 15.34 -38 23 24.3 0.3- 1.2- 821/AL 1973 08 23.14204 20 57 15.22 -38 23 21.5 0.3- 1.0- 821/AL 1973 08 23.14899 20 57 15.10 -38 23 18.8 0.3- 0.9- 821/AL 1973 08 23.15593 20 57 14.97 -38 23 16.5 0.4- 1.2- 821/AL 1973 08 29.75625 20 56 30.79 -37 35 57.0 ( 0.9- 2.9-) 076/HB 1973 08 29.80347 20 56 30.81 -37 35 31.3 2.1+ 0.7+ 076/HB 1973 09 16.36533 21 01 05.59 -34 45 43.9 ( 2.4+ 3.3-) 474/JN 1973 09 16.38769 21 01 05.95 -34 45 25.6 0.9- 0.5+ 474/JN 1973 09 22.22037 21 04 33.24 -33 40 26.4 0.3- 2.4- 691/ST 1973 09 22.24537 21 04 34.14 -33 40 09.4 0.5- 2.7- 691/ST 1973 09 26.10139 21 07 19.01 -32 55 25.0 0.1- 0.6- 808/YS 1973 10 21.17726 21 32 06.68 -27 49 45.4 0.8- 1.5- 691/ST 1973 10 21.20145 21 32 08.33 -27 49 27.5 0.8- 1.9- 691/ST 1973 11 21.19259 22 12 32.23 -21 18 51.8 0.2- 0.5- 691/ST 1978 04 13.60347 10 36 51.6 +22 24 48 (11.9+ 2.6+) 372/sk 1978 04 26.5309 10 32 45.9 +21 37 15 ( 4.7- 8.2+) 372/sk - continued - P/Clark NK 502 - 3 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1978 04 27.5330 10 32 40.1 +21 32 11 ( 4.6+ 7.7+) 372/sk 1978 04 27.55730 10 32 40.2 +21 32 06 ( 8.4+ 10.3+) 372/sk 1978 04 30.17167 10 32 31.30 +21 17 52.0 0.1+ 0.7+ 801/HO 1978 07 01.10505 11 19 23.51 +11 15 22.5 0.4- 3.3+ 801/HO 1978 07 30.32505 12 05 00.24 +04 16 58.6 (61.3+ 0.8-) 474/JN 1978 07 31.31359 12 06 40.17 +04 01 38.9 2.0+ 0.6+ 474/JN 1978 08 05.33043 12 15 37.87 +02 42 43.6 ( 7.4- 4.3+) 474/JN 1979 07 23.88750 02 12 39.11 +05 06 39.7 ( 4.5+ 7.3+) 323/PR 1979 08 03.85046 02 19 18.60 +05 30 27.3 ( 8.2+ 1.0+) 323/PR 1983 12 15.52016 13 56 35.97 -05 16 03.4 ( 5.8+ 3.2-) 675/PL 1984 01 30.60653 15 32 25.07 -13 27 33.2 0.8- 3.3- 474/JN 1984 01 30.64617 15 32 30.41 -13 27 54.3 0.3+ 1.0- 474/JN 1984 02 01.49861 15 36 38.14 -13 46 03.4 2.6+ 1.6- 707/ev 1984 02 02.78125 15 39 30.31 -13 58 21.6 0.1- 1.9- 323/PR 1984 02 11.50350 15 59 17.69 -15 20 37.2 ( 6.2+ 1.6-) 801/HO 1984 04 06.76771 18 13 37.39 -22 45 47.1 2.2- 0.8- 323/PR 1984 04 09.84479 18 21 17.56 -23 08 34.2 2.8- 0.0 323/PR 1984 04 12.84132 18 28 44.94 -23 30 50.8 1.1+ 2.6+ 323/PR 1984 05 03.82917 19 19 26.19 -26 16 58.7 1.2- 0.6+ 323/PR 1984 05 29.68311 20 12 30.79 -30 33 38.7 1.0- 2.0+ 474/JN 1984 05 29.69642 20 12 32.08 -30 33 48.2 1.3- 1.7+ 474/JN 1984 06 04.32083 20 21 35.10 -31 40 07.0 ( 5.2- 2.7+) 809/ES 1984 06 04.36285 20 21 38.56 -31 40 37.0 ( 6.5- 3.2+) 809/ES 1984 06 06.81389 20 25 13.31 -32 10 34.3 3.1- 1.3+ 323/PR 1984 06 25.76944 20 44 08.59 -36 11 44.6 1.4- 1.6+ 323/PR 1984 06 28.05818 20 45 17.75 -36 40 24.9 0.5- 1.9- 491/CN 1984 06 28.69213 20 45 33.99 -36 48 00.8 ( 8.3- 0.7-) 299/LL 1984 06 29.71364 20 45 58.39 -37 00 18.5 ( 2.9- 4.6+) 299/LL 1984 07 10.88444 20 47 23.43 -39 01 12.1 1.6- 2.6+ 299/LL 1984 07 25.43704 20 43 17.98 -40 36 33.3 0.4- 3.6+ 474/JN 1984 07 25.44722 20 43 17.70 -40 36 35.5 0.2- 3.8+ 474/JN 1984 07 26.81375 20 42 42.32 -40 41 07.8 2.6- 2.6+ 299/LL 1984 07 28.72241 20 41 54.84 -40 45 52.2 0.4- 2.7+ 299/LL 1984 07 31.77516 20 40 37.80 -40 50 00.3 1.5+ 1.4+ 299/LL 1984 08 02.74339 20 39 50.16 -40 50 26.1 1.1+ 3.0+ 299/LL 1984 08 04.82207 20 39 01.94 -40 49 02.2 1.8+ 2.6+ 299/LL 1984 08 25.48624 20 36 05.23 -39 07 25.1 1.5+ 3.0+ 474/JN 1984 08 25.49932 20 36 05.29 -39 07 18.2 1.6+ 3.5+ 474/JN ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1987 August 20