OAA computing section circular NK 458 Periodic Comet Gehrels 3 1977 VII = 1984l

The following improved orbital elements, by S. Nakano, are from 34 observations 1975 to 1984. Perturbations by all nine planets were taken into account. The mean residual is +/- 0.86 arc second: Epoch = 1977 Apr. 7.0 1985 May 15.0 ET (m.e.) T = 1977 Apr. 23.19586 1985 June 3.38366 +/- 0.00290 ET Peri. = 231.47717 231.30351 +/- 0.00894 Node = 242.54975 242.44868 1950.0 +/- 0.00893 Inc. = 1.10125 1.09976 +/- 0.00015 q = 3.4243479 3.4422376 +/- 0.0000021 AU e = 0.1518987 0.1492913 +/- 0.0000005 a = 4.0376636 4.0463174 +/- 0.0000012 AU nß = 0.12148114 0.12109164 +/- 0.00000005 P = 8.113 8.139 +/- 0.0000035 years The following residuals in seconds of arc are from the above orbital elements: Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1975 Oct. 27.14534 1 51 39.58 +12 17 59.6 0.1- 2.0- 675/gh 28.15645 1 51 00.93 +12 14 13.4 ( 1.8+ 2.9-) 675/gh 30.14568 1 49 44.82 +12 06 53.4 0.7- 0.7+ 675/gh Nov. 7.16956 1 44 48.10 +11 37 30.3 0.6+ 0.9+ 801/bg 9.15630 1 43 38.38 +11 30 28.6 0.6- 0.8+ 801/mc 10.10184 1 43 06.05 +11 27 11.7 0.4+ 1.4+ 801/mc 30.04437 1 34 07.08 +10 30 02.0 0.2+ 0.2- 801/HO Dec. 7.20903 1 32 19.15 +10 17 21.2 0.9+ 0.4+ 693/rm 7.23264 1 32 18.87 +10 17 19.3 1.1+ 0.6+ 693/rm 8.15354 1 32 08.65 +10 16 03.1 1.0- 1.0+ 801/sa 29.04925 1 32 18.75 +10 10 24.4 2.0- 1.5+ 802/sa 1976 Jan. 27.18731 1 44 29.24 +11 11 49.0 0.3- 0.3+ 691/rm Feb. 25.01153 2 07 18.98 +13 09 26.4 1.5+ 1.9- 802/sw 26.02103 2 08 15.82 +13 14 14.7 1.8- 0.3- 802/sw Oct. 23.38260 6 41 29.43 +22 38 09.1 0.4+ 0.9- 801/HO Nov. 20.36185 6 41 03.52 +22 28 53.7 0.4- 0.2+ 801/HO 24.35208 6 39 38.90 +22 28 51.0 0.0 0.4- 693/CT 24.38819 6 39 38.05 +22 28 51.3 0.7+ 0.2- 693/CT Dec. 16.30738 6 26 58.37 +22 31 49.0 0.2- 0.0 801/HO 24.41181 6 20 56.09 +22 33 09.7 0.3+ 0.5- 693/CT - continued - Periodic Comet Gehrels 3 NK 458-2 Date/ UT R.A. (1950.0) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1976 Dec. 24.44375 6 20 54.60 +22 33 10.0 0.3+ 0.3- 693/CT 1977 Jan. 13.18482 6 06 32.69 +22 34 26.1 0.5- 0.3- 801/sw Feb. 16.05824 5 55 04.48 +22 34 01.4 0.6- 0.1- 801/mc Mar. 22.05810 6 07 33.91 +22 36 05.1 ( 3.2- 2.2+) 801/sw Nov. 18.40129 10 59 09.30 + 5 21 43.8 0.9+ 0.3- 801/mc Dec. 11.37934 11 15 04.81 + 3 34 45.9 0.9- 0.7+ 801/sw 1978 Feb. 3.73159 11 20 05.53 + 2 44 35.3 ( 3.7- 1.4-) 323/jp 6.77639 11 18 52.11 + 2 51 36.4 ( 1.8- 4.0-) 323/jp 11.26175 11 16 49.45 + 3 03 40.1 0.3- 0.1+ 801/HO Mar. 2.62371 11 05 39.23 + 4 12 24.6 0.9+ 0.7+ 381/ks 2.66266 11 05 37.64 + 4 12 33.4 0.1- 0.2+ 381/ks 5.56125 11 03 47.19 + 4 24 10.6 1.0+ 0.8- 381/ks 12.62442 10 59 18.93 + 4 52 40.3 0.4- 0.1+ 885/ur 12.65069 10 59 17.98 + 4 52 45.3 0.5+ 1.2- 885/ur 31.83189 10 48 49.91 + 6 01 35.4 ( 2.4+ 1.6-) 046/mr Apr. 7.55208 10 46 11.32 + 6 19 59.7 ( 3.0- 2.2+) 323/PR 13.65000 10 44 24.3 + 6 32 59 0.3- 2.7+ 372/sk Y May 9.54861 10 43 50.98 + 6 46 43.5 0.3- 1.1+ 323/PR 1984 Aug. 7.45975 5 12 24.04 +22 56 23.8 0.5+ 0.5- 675/PL 8.45489 5 13 32.65 +22 57 31.7 0.5- 0.0 675/PL ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1984 October 10

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