OAA computing section circular NK 520 Periodic Comet Smirnova-Chernykh 1967 XV = 1978 NA6
= 1981 UH18 The following improved orbital elements, by S. Nakano, are from 139 observations 1975 to 1987. Perturbations by all nine planets were taken into account. The mean residual is +/- 1.20 arc seconds. The identifications with minor planets 1978 NA6 and 1981 UH18 are by S. Nakano (MPC 12025). Epoch = 1984 Mar. 1.0 ET T = 1984 Feb. 21.41118 +/- 0.00140 (m.e.) ET Peri. = 90.87024 +/- 0.00050 Node = 77.04170 +/- 0.00048 (1950.0) Inc. = 6.64374 +/- 0.00010 q = 3.5574119 +/- 0.0000014 AU e = 0.1462162 +/- 0.0000003 a = 4.1666426 +/- 0.0000003 AU n_ = 0.11588432 +/- 0.00000001 P = 8.505 +/- 0.0000009 years T = 1975 Aug. 6.22619 ET Epoch = 1975 Aug. 16.0 ET Peri. = 90.17677 e = 0.1453799 Node = 77.10789 (1950.0) a = 4.1739649 AU Inc. = 6.64140 n_= 0.11557952 q = 3.5671544 AU P = 8.528 years The predicted orbit for the 1992 return is as follows: T = 1992 Aug. 5.93495 ET Epoch = 1992 Aug. 6.0 ET Peri. = 88.93837 e = 0.1473143 Node = 76.83822 (1950.0) a = 4.1892855 AU Inc. = 6.62823 n_= 0.11494607 q = 3.5721440 AU P = 8.575 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 ! , " " " 1967 03 09.98000 11 52 48.85 +10 46 44.8 (13.1+ 0.9-) 095/CR 1967 04 04.84721 11 37 05.07 +12 10 20.9 (14.9+ 2.4-) 095/CR 1975 03 04.77955 09 23 41.01 +23 49 27.1 2.4+ 2.4+ 095/CR 1975 03 14.76167 09 18 58.16 +24 02 10.5 2.9+ 1.4+ 095/CR 1975 03 16.83757 09 18 11.12 +24 03 21.5 1.0- 0.3+ 095/CR 1975 03 30.80918 09 15 01.74 +23 59 00.0 0.1+ 1.1- 095/CR 1975 04 03.53750 09 14 49.22 +23 54 26.0 0.5- 0.1- 372/sk 1975 04 03.83496 09 14 49.02 +23 53 59.0 0.9+ 1.0- 095/CR 1975 04 04.59340 09 14 48.56 +23 52 54.5 1.0- 1.5+ 372/sk 1975 04 04.76546 09 14 48.85 +23 52 36.9 1.1+ 0.1- 095/CR - continued - P/Smirnova-Chernykh NK 520 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1975 04 04.82409 09 14 48.76 +23 52 31.3 0.4+ 0.2- 095/CR 1975 04 05.79145 09 14 49.82 +23 50 58.5 2.4+ 1.1- 095/CR 1975 04 06.49699 09 14 50.97 +23 49 47.9 0.1- 1.7- 380/kj 1975 04 06.54653 09 14 51.11 +23 49 44.6 0.9+ 0.1+ 380/kj 1975 04 06.64655 09 14 51.19 +23 49 32.6 0.3- 1.3- 372/sk 1975 04 06.77053 09 14 51.69 +23 49 19.4 0.3+ 1.7- 095/CR 1975 04 07.79144 09 14 55.02 +23 47 31.5 1.3+ 1.1- 095/CR 1975 04 11.20694 09 15 14.68 +23 40 46.2 1.2+ 1.9- 774/WN 1975 04 11.34097 09 15 15.56 +23 40 32.6 0.5- 1.5+ 693/CT 1975 04 11.79280 09 15 19.46 +23 39 30.8 0.7+ 1.8- 095/CR 1975 04 12.13206 09 15 22.25 +23 38 47.1 0.5- 0.8- 801/HO 1975 04 15.06175 09 15 53.01 +23 31 56.8 0.1- 0.8- 801/HO 1975 04 15.87903 09 16 03.16 +23 29 53.5 0.7- 1.4- 095/CR 1975 04 17.19255 09 16 21.27 +23 26 34.0 0.8- 1.7+ 691/ST 1975 04 17.20978 09 16 21.51 +23 26 31.1 0.7- 1.6+ 691/ST 1975 04 29.11637 09 20 28.58 +22 49 36.6 0.4- 0.1- 801/HO 1975 04 30.09493 09 20 55.23 +22 46 06.7 0.1+ 0.7- 801/HO 1975 04 30.55972 09 21 08.19 +22 44 28.2 0.7+ 1.4+ 372/sk 1975 05 02.80082 09 22 13.53 +22 36 08.4 1.0+ 0.7+ 095/CR 1975 05 04.19913 09 22 56.52 +22 30 47.7 0.2+ 0.9+ 691/ST 1975 05 04.22188 09 22 57.23 +22 30 42.2 0.3+ 0.8+ 691/ST 1975 05 04.80741 09 23 15.83 +22 28 24.0 0.4+ 0.0 095/CR 1975 05 07.83018 09 24 56.28 +22 16 16.2 2.7- 1.0+ 095/CR 1975 05 10.80917 09 26 43.33 +22 03 43.8 0.8- 0.9+ 095/CR 1975 05 11.81035 09 27 20.99 +21 59 22.9 0.2+ 0.3+ 095/CR 1975 05 14.81834 09 29 18.48 +21 45 59.4 ( 3.4- 0.8+) 095/CR 1975 05 29.11046 09 40 07.46 +20 35 19.6 0.1+ 0.3- 801/HO 1975 06 04.16667 09 45 21.06 +20 02 12.7 0.7- 1.8+ 691/ST 1975 06 04.19138 09 45 22.38 +20 02 04.1 0.6- 1.7+ 691/ST 1976 01 05.41524 13 47 16.70 -04 43 30.9 0.7+ 0.9- 801/HO 1976 01 08.78278 13 49 50.26 -04 54 31.3 ( 4.2- 0.5+) 372/sk 1976 01 08.81958 13 49 51.65 -04 54 39.1 ( 7.6- 0.4-) 372/sk 1976 01 26.52865 14 01 02.87 -05 36 50.4 1.2+ 0.0 691/ST 1976 01 26.53935 14 01 03.15 -05 36 51.2 0.6+ 0.2+ 691/ST 1976 02 05.31294 14 05 18.52 -05 48 12.1 0.5+ 0.6+ 801/HO 1976 02 23.36256 14 08 58.21 -05 46 28.1 ( 3.9+ 1.3+) 801/HO 1976 03 05.47986 14 08 17.83 -05 31 29.9 0.4- 1.5+ 693/CT 1976 03 05.51736 14 08 17.43 -05 31 26.1 0.4- 1.3+ 693/CT 1976 03 06.33740 14 08 09.44 -05 29 53.3 ( 3.7+ 5.5+) 801/HO 1976 03 08.05934 14 07 49.29 -05 26 42.3 0.6- 0.6+ 095/CR 1976 03 11.04908 14 07 07.33 -05 20 33.3 2.5- 0.7+ 095/CR 1976 03 30.32093 13 59 16.48 -04 30 01.3 1.0+ 0.7- 801/HO 1976 03 30.44097 13 59 12.55 -04 29 38.8 0.3+ 0.2+ 693/CT 1976 03 30.46667 13 59 11.76 -04 29 34.4 1.3+ 0.1+ 693/CT 1976 04 01.95882 13 57 49.41 -04 22 14.2 1.7- 1.2- 095/CR 1976 04 02.95515 13 57 15.60 -04 19 15.8 0.7- 0.3- 095/CR 1976 04 04.95809 13 56 05.85 -04 13 17.2 2.0- 1.3+ 095/CR 1976 04 05.93713 13 55 31.28 -04 10 24.1 0.1+ 0.1+ 095/CR 1976 04 06.96803 13 54 54.20 -04 07 19.8 0.5- 1.3+ 095/CR 1976 04 23.93311 13 44 13.92 -03 21 18.6 0.4+ 0.2+ 095/CR - continued - P/Smirnova-Chernykh NK 520 - 3 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1976 04 25.29723 13 43 22.67 -03 18 11.0 0.4+ 0.3+ 693/CT 1976 04 25.33057 13 43 21.38 -03 18 06.7 0.3+ 0.1+ 693/CT 1976 05 01.15936 13 39 48.54 -03 06 15.9 1.2- 1.1+ 801/HO 1976 05 03.87141 13 38 14.39 -03 01 40.6 0.6+ 0.1+ 095/CR 1976 05 17.46042 13 31 30.05 -02 48 37.1 ( 8.7- 0.5+) 323/PR 1976 05 23.85619 13 29 09.81 -02 48 55.6 0.0 1.6- 095/CR 1976 05 25.18958 13 28 45.22 -02 49 28.4 1.4+ 0.2- 693/CT 1976 05 25.21215 13 28 44.80 -02 49 29.3 1.5+ 0.5- 693/CT 1976 05 25.83989 13 28 33.62 -02 49 49.2 0.2+ 0.3+ 095/CR 1976 05 28.82256 13 27 46.10 -02 51 58.3 0.1- 0.9+ 095/CR 1976 05 29.84943 13 27 31.70 -02 52 57.0 0.2+ 0.4- 095/CR 1976 06 04.12922 13 26 33.92 -02 59 33.5 0.4- 1.2+ 801/HO 1976 06 20.84178 13 26 31.73 -03 38 24.4 0.8+ 1.6+ 095/CR 1976 06 26.22656 13 27 27.95 -03 56 12.4 0.9- 1.0+ 691/ST 1976 06 26.23559 13 27 28.05 -03 56 14.5 1.1- 0.8+ 691/ST 1976 07 31.15417 13 43 24.30 -06 39 01.6 0.3- 0.4+ 691/ST 1976 07 31.16296 13 43 24.65 -06 39 04.2 0.2- 0.7+ 691/ST 1978 06 13.74861 20 56 52.55 -22 57 35.5 1.7+ 0.6+ 323/PR 1978 07 10.3431 20 46 31.0 -24 15 42 ( 0.1- 6.0-) 675/PL Y 1978 07 10.72604 20 46 18.56 -24 16 45.7 1.3+ 1.0+ 323/PR 1978 07 11.4247 20 45 55.3 -24 19 03 1.2- 0.7- 675/PL Y 1978 07 13.3825 20 44 57.4 -24 29 14 ( 0.03+ 0.07-) 675/PL Y 1978 08 05.55139 20 30 32.17 -25 31 55.7 0.6+ 2.0- 474/JN 1978 08 05.57338 20 30 31.55 -25 32 05.8 ( 3.5+ 8.9-) 474/JN 1979 09 01.23172 23 06 01.90 -14 50 52.5 0.3- 1.1- 801/HO 1979 09 17.15370 22 57 05.75 -15 43 01.8 2.1- 1.9+ 801/HO 1980 11 28.25002 00 51 34.00 -01 23 46.4 0.2+ 0.8- 675/PL 1981 01 27.12502 01 03 55.98 +01 34 44.4 1.4+ 0.2+ 675/PL 1981 09 26.29228 04 02 46.1 +17 13 22 (37.7- 4.4-) 372/sk Y 1981 09 26.79228 04 02 46.10 +17 13 22.0 ( 8.3- 0.8-) 372/sk 1981 09 27.69479 04 02 42.33 +17 13 12.5 2.0- 0.2- 372/sk 1981 09 27.74766 04 02 42.33 +17 13 12.5 2.6+ 0.3+ 372/sk 1981 10 24.98956 03 54 30.32 +16 54 47.6 1.8+ 2.2- 095/CR 1981 11 02.29814 03 49 58.62 +16 44 59.2 0.8- 0.2- 801/HO 1981 11 25.21964 03 35 06.91 +16 14 17.8 0.3+ 0.1+ 801/HO 1981 11 26.14321 03 34 30.31 +16 13 06.7 1.6+ 0.2- 801/HO 1981 11 27.21672 03 33 47.58 +16 11 46.0 2.0- 0.0 707/ev 1981 11 29.14353 03 32 32.15 +16 09 25.4 0.5+ 1.2+ 801/HO 1981 12 30.17113 03 17 00.52 +15 51 05.0 0.0 1.0+ 801/HO 1982 11 09.19677 07 36 16.88 +24 25 54.9 1.3- 0.2- 801/HO 1982 11 11.26924 07 36 31.62 +24 28 55.0 2.8- 1.2+ 801/HO 1982 11 21.35417 07 36 33.08 +24 46 28.5 0.4- 0.1+ 707/ev 1982 12 22.11805 07 24 47.32 +26 04 31.6 1.1- 1.3+ 511/HU 1982 12 23.11805 07 24 08.61 +26 07 26.0 ( 7.8- 7.4+) 511/HU 1983 01 09.20069 07 11 59.81 +26 52 12.0 1.9- 1.0- 688/LO 1983 01 09.23403 07 11 58.33 +26 52 16.2 1.2- 1.6- 688/LO 1983 01 13.20240 07 09 00.27 +27 01 16.1 0.4- 0.2+ 801/HO 1983 01 16.13194 07 06 50.54 +27 07 24.6 0.0 0.6+ 688/LO 1983 01 16.16319 07 06 49.07 +27 07 28.8 0.9- 0.9+ 688/LO 1983 01 16.19861 07 06 47.57 +27 07 31.9 0.3+ 0.5- 688/LO - continued - P/Smirnova-Chernykh NK 520 - 4 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ! , " " " 1983 01 16.22917 07 06 46.11 +27 07 35.4 0.8- 0.8- 688/LO 1983 01 21.20694 07 03 11.70 +27 16 59.2 ( 3.8- 1.2+) 688/LO 1983 01 21.23750 07 03 10.77 +27 17 01.3 1.3+ 0.1+ 688/LO 1983 02 10.17645 06 51 42.29 +27 40 41.8 1.0- 0.7+ 801/HO 1983 02 11.13726 06 51 18.71 +27 41 18.0 0.5- 0.7+ 801/HO 1983 02 12.21042 06 50 52.72 +27 41 55.1 (11.4- 0.5+) 707/ev 1984 01 09.41382 11 57 50.36 +08 34 30.0 0.6+ 0.9+ 801/HO 1984 02 01.40133 11 59 11.80 +09 18 43.0 0.9- 1.0+ 801/HO 1984 02 01.75278 11 59 08.86 +09 19 55.8 ( 2.1+ 3.9+) 323/PR 1984 02 26.95215 11 49 55.42 +11 00 12.6 0.7+ 1.0- 095/CR 1984 02 27.73356 11 49 29.73 +11 03 48.6 0.8- 2.9+ 323/PR 1984 03 01.32181 11 48 02.41 +11 15 12.1 0.2- 2.9+ 801/HO 1984 03 01.66528 11 47 50.67 +11 16 45.1 0.7- 0.9+ 323/PR 1984 03 12.69583 11 41 06.26 +12 03 19.1 1.9- 0.3- 323/PR 1984 03 20.85877 11 35 57.56 +12 32 53.2 0.8+ 2.0- 046/KL 1984 03 20.87122 11 35 57.11 +12 32 55.1 1.2+ 2.6- 046/KL 1984 03 21.85623 11 35 20.38 +12 36 06.3 0.9+ 2.7- 046/KL 1984 03 21.87035 11 35 19.75 +12 36 10.3 0.5- 1.5- 046/KL 1984 03 22.85820 11 34 43.10 +12 39 16.3 1.7- 1.6- 046/KL 1984 03 22.87232 11 34 42.65 +12 39 18.5 0.5- 2.0- 046/KL 1984 03 24.84037 11 33 30.62 +12 45 12.6 1.3- 0.8- 046/KL 1984 03 24.85455 11 33 30.11 +12 45 13.6 1.1- 2.3- 046/KL 1984 03 28.18939 11 31 31.45 +12 54 20.0 0.5+ 3.0+ 801/HO 1984 03 28.26736 11 31 28.82 +12 54 29.6 1.0+ 0.3+ 675/PL 1984 03 29.84090 11 30 34.70 +12 58 15.4 1.8+ 1.4- 095/CR 1984 03 30.23819 11 30 21.05 +12 59 13.2 1.2- 1.0+ 675/PL 1984 03 30.63021 11 30 07.96 +13 00 09.5 1.2+ 0.8+ 323/PR 1984 04 03.16418 11 28 13.00 +13 07 13.9 1.9+ 2.2+ 801/HO 1984 04 03.23194 11 28 10.74 +13 07 17.4 0.7- 1.9- 688/LO 1984 04 03.32083 11 28 07.86 +13 07 27.0 0.6- 1.8- 688/LO 1984 04 03.84524 11 27 51.76 +13 08 21.8 1.6+ 1.3- 095/CR 1984 04 05.82744 11 26 51.88 +13 11 28.2 ( 2.7+ 3.1-) 095/CR 1984 04 06.56632 11 26 30.08 +13 12 38.3 0.5- 0.7+ 323/PR 1984 04 08.32986 11 25 40.15 +13 14 43.2 1.4+ 2.4- 688/LO 1984 04 08.36736 11 25 39.06 +13 14 46.0 1.1+ 2.1- 688/LO 1984 04 29.12057 11 19 23.53 +13 10 01.4 0.7+ 0.6+ 801/HO 1984 05 04.84294 11 18 56.14 +12 59 06.0 0.1+ 2.7- 095/CR 1984 05 06.09926 11 18 54.86 +12 56 15.5 1.1+ 0.8+ 801/HO 1984 05 26.08243 11 22 07.91 +11 47 45.1 0.9+ 0.1+ 801/HO 1984 06 19.47639 11 34 06.42 +09 38 10.9 1.9- 0.4+ 323/PR 1985 03 22.38501 15 56 55.60 -16 26 18.6 1.0- 0.8+ 801/HO 1985 05 11.32569 15 36 59.86 -15 47 41.3 1.3- 2.6+ 675/PL 1985 05 12.26250 15 36 22.32 -15 46 37.6 1.2- 1.6- 707/ev 1985 05 14.33611 15 34 58.66 -15 44 06.7 1.9- 0.6- 675/PL 1985 05 14.34861 15 34 58.40 -15 44 06.8 1.9+ 1.6- 675/PL 1985 05 15.42014 15 34 14.96 -15 42 49.7 1.1+ 1.1- 675/PL 1987 06 30.76014 22 12 55.12 -18 26 55.5 2.4+ 0.0 413/SS 1987 06 30.82264 22 12 54.56 -18 27 03.8 ( 3.6+ 1.3+) 413/SS ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1987 December 10