OAA computing section circular NK 491 Periodic Comet Finlay 1960 VIII = 1967 IX = 1974 X

= 1981 XII The following improved orbital elements, by S. Nakano, are from 33 observations 1960 to 1981, including full planetary per- turbations and non-gravitational effect of style II. The mean residual is +/- 1.03 arc seconds. Epoch = 1981 June 5.0 ET T = 1981 June 19.98941 +/- 0.00042 (m.e.) ET Peri. = 322.12888 +/- 0.00130 Node = 41.80310 +/- 0.00130 (1950.0) Inc. = 3.64252 +/- 0.00007 q = 1.1009247 +/- 0.0000013 AU e = 0.6984189 +/- 0.0000003 a = 3.6505097 +/- 0.0000012 AU n_ = 0.14131030 +/- 0.00000007 P = 6.975 +/- 0.0000034 years A1 = +0.257 +/- 0.012 A2 = +0.01709 +/- 0.00016 T = 1960 Sept. 1.10258 ET Epoch = 1960 Aug. 14.0 ET Peri. = 321.61521 e = 0.7024771 Node = 42.05425 (1950.0) a = 3.6205449 AU Inc. = 3.64433 n_= 0.14306822 q = 1.0771950 AU P = 6.889 years T = 1967 July 28.21220 ET Epoch = 1967 July 9.0 ET Peri. = 321.68525 e = 0.7019837 Node = 41.99796 (1950.0) a = 3.6251774 AU Inc. = 3.64166 n_= 0.14279407 q = 1.0803621 AU P = 6.902 years T = 1974 July 3.92943 ET Epoch = 1974 July 12.0 ET Peri. = 322.12723 e = 0.6991793 Node = 41.78180 (1950.0) a = 3.6429543 AU Inc. = 3.64539 n_= 0.14175014 q = 1.0958760 AU P = 6.953 years The predicted orbit for the 1988 return is as follows: T = 1988 June 6.07117 ET Epoch = 1988 June 8.0 ET Peri. = 322.20306 e = 0.6994666 Node = 41.74184 (1950.0) a = 3.6414683 AU Inc. = 3.64739 n_= 0.14183691 q = 1.0943828 AU P = 6.949 years There are the residuals, in seconds of arc, are from the above orbital elements on the next pages: - continued - P/Finlay NK 491 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1960 06 22.38600 22 51 00.36 -15 12 50.0 1.1- 0.1+ 689/FS 1960 06 22.41023 22 51 05.73 -15 12 26.7 0.0 0.6+ 689/FS 1960 08 02.35753 02 11 49.18 +03 17 30.0 0.6+ 0.1+ 689/FS 1960 08 02.36238 02 11 50.77 +03 17 40.2 0.6- 0.0 689/FS 1960 08 17.40052 03 36 41.13 +11 26 23.5 0.8- 0.2+ 689/FS 1960 08 17.40537 03 36 42.70 +11 26 32.3 0.4- 0.7+ 689/FS 1960 09 26.44729 06 17 45.89 +22 02 15.1 0.1+ 0.2- 689/FS 1960 09 26.45353 06 17 46.89 +22 02 18.1 0.6+ 0.0 689/FS 1960 10 25.46134 07 07 21.50 +24 45 37.3 0.7- 1.2+ 689/FS 1960 10 25.46826 07 07 21.79 +24 45 39.6 0.4- 1.2+ 689/FS 1960 11 11.31650 07 10 00.85 +26 25 57.4 0.2- 0.5+ 689/FS 1960 11 11.34627 07 10 00.00 +26 26 09.7 0.1- 0.6+ 689/FS 1960 12 18.38240 06 21 38.16 +29 28 06.5 1.7+ 0.4+ 689/FS 1960 12 26.39132 06 09 21.84 +29 34 31.8 0.2- 0.3- 689/FS 1960 12 26.43721 06 09 17.86 +29 34 31.3 0.4+ 0.1- 689/FS 1961 01 10.30891 05 52 48.55 +29 20 43.6 0.0 0.5- 689/FS 1961 01 13.29985 05 50 39.91 +29 15 37.9 0.8+ 0.3- 689/FS 1967 07 17.74722 03 11 19.67 +14 42 16.2 1.4+ 0.3+ 387/tm 1967 07 17.75556 03 11 21.98 +14 42 24.6 2.7+ 2.2- 387/tm 1967 08 07.44032 04 39 44.66 +20 29 27.3 1.7- 1.4- 693/CT 1967 08 07.74448 04 40 58.03 +20 33 02.9 ( 5.4- 1.5-) 387/tm 1967 08 07.75903 04 41 01.65 +20 33 15.2 ( 3.7- 0.4+) 387/tm 1967 08 10.77292 04 53 03.87 +21 06 48.6 (10.2+ 7.3+) 387/tm 1967 08 11.08322 04 54 16.95 +21 09 55.0 ( 6.0+ 2.3+) 020/NI 1967 08 11.08946 04 54 18.40 +21 09 59.5 ( 5.8+ 2.9+) 020/NI 1967 08 15.11722 05 09 54.14 +21 47 57.4 ( 3.4- 1.8-) 020/NI 1967 10 07.80817 07 43 11.47 +23 24 05.1 1.7- 2.3- 371/tm 1967 10 07.81234 07 43 11.91 +23 24 05.8 1.9- 1.3- 371/tm 1967 10 08.81025 07 45 00.45 +23 22 57.9 1.1- 0.8- 371/tm 1974 07 18.76667 04 13 03.3 +20 07 10 ( 4.4- 10.0-) 372/sk Y 1974 07 18.78057 04 13 06.64 +20 07 25.7 ( 3.7- 5.4-) 372/sk 1974 07 19.76880 04 17 00.37 +20 20 18.0 ( 3.7- 0.6-) 372/sk 1974 07 20.32512 04 19 11.74 +20 27 19.8 0.3+ 0.7+ 801/HO 1974 09 12.48304 07 14 56.77 +23 50 02.9 0.5- 0.6+ 691/ST 1974 11 10.49068 08 44 07.69 +22 07 21.7 0.5+ 0.1+ 691/ST 1974 11 11.30249 08 44 30.95 +22 08 01.8 2.5- 0.8+ 801/HO 1974 12 19.25712 08 33 14.58 +24 21 15.5 0.2+ 0.0 691/ST 1974 12 23.28356 08 28 52.63 +24 43 03.7 0.2- 0.9+ 801/HO 1975 01 07.29907 08 09 32.49 +25 59 24.4 1.8+ 0.1- 691/ST 1981 05 07.87951 23 55 59.45 -03 24 35.5 ( 9.4- 2.6+) 323/PR 1981 05 08.87986 23 59 50.09 -02 59 06.0 0.1- 2.3- 323/PR 1981 08 10.48023 05 59 50.11 +24 03 34.3 1.5+ 1.0+ 675/PL 1981 08 11.48370 06 03 01.34 +24 05 45.0 0.4+ 1.4- 675/PL 1981 09 10.47747 07 25 39.51 +23 44 01.9 (14.7+ 1.7-) 675/PL ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1986 December 23

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