OAA computing section circular NK 541 Periodic Comet Shajn-Schaldach
The following improved orbital elements, by S. Nakano, are from 50 observations 1971 to 1987, including full planetary perturbations and non-gravitational effect of style II. The mean residual is +/- 0.93 arc second. Epoch = 1986 May 10.0 ET T = 1986 May 27.36545 +/- 0.00966 (m.e.) ET Peri. = 216.52480 +/- 0.00253 Node = 166.24145 +/- 0.00028 (1950.0) Inc. = 6.09051 +/- 0.00004 q = 2.3307605 +/- 0.0000071 AU e = 0.3895992 +/- 0.0000014 a = 3.8184098 +/- 0.0000043 AU nß = 0.13209314 +/- 0.00000023 P = 7.461 +/- 0.0000127 years A1 = -3.509 +/- 1.413 A2 = -0.09130 +/- 0.01295 T = 1971 Oct. 1.94997 ET Epoch = 1971 Oct. 16.0 ET Peri. = 215.12841 e = 0.4063048 Node = 167.26535 (1950.0) a = 3.7517700 AU Inc. = 6.15083 nß= 0.13562813 q = 2.2274079 AU P = 7.267 years T = 1979 Jan. 8.97726 ET Epoch = 1979 Jan. 7.0 ET Peri. = 215.30668 e = 0.4067509 Node = 167.19398 (1950.0) a = 3.7474497 AU Inc. = 6.15401 nß= 0.13586274 q = 2.2231711 AU P = 7.254 years The predicted orbit for the 1993 return is as follows: T = 1993 Nov. 15.98278 ET Epoch = 1993 Nov. 29.0 ET Peri. = 216.54555 e = 0.3876775 Node = 166.20348 (1950.0) a = 3.8289486 AU Inc. = 6.08366 nß= 0.13154816 q = 2.3445513 AU P = 7.492 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 ¡ , " " " 1971 09 16.31107 02 14 41.67 +08 18 48.8 0.9- 0.1- 806/CH 1971 09 26.29022 02 14 37.70 +07 28 37.2 0.3- 0.9+ 805/EL 1971 09 27.29064 02 14 28.54 +07 22 53.1 0.1- 1.0+ 805/EL 1971 09 29.37789 02 14 04.56 +07 10 28.2 1.6- 2.0+ 675/PL 1971 09 30.43056 02 13 49.88 +07 04 05.6 2.3- 1.7+ 675/PL - continued - P/Shajn-Schaldach NK 541 - 2 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1971 10 14.58333 02 08 20.53 +05 31 37.5 ( 1.2- 4.1-) 371/TA 1971 10 14.61875 02 08 19.40 +05 31 24.4 ( 0.7- 3.0-) 371/TA 1971 10 19.36250 02 05 46.85 +04 59 59.6 1.5+ 1.6+ 693/CT 1971 10 19.38542 02 05 46.04 +04 59 50.6 1.7+ 1.6+ 693/CT 1971 10 20.69585 02 05 01.30 +04 51 18.8 ( 6.5- 0.9+) 371/TA 1971 10 20.70488 02 05 00.94 +04 51 15.8 ( 7.0- 1.4+) 371/TA 1971 10 21.19466 02 04 44.91 +04 48 13.8 0.0 0.7+ 805/EL 1971 10 21.22591 02 04 43.60 +04 47 59.3 2.4- 1.7- 805/EL 1971 10 21.87384 02 04 21.79 +04 43 40.5 ( 1.4+ 3.2-) 095/CR 1971 10 22.93905 02 03 44.95 +04 36 58.4 1.3- 0.5- 993/WL 1971 10 26.22708 02 01 50.54 +04 17 00.5 0.2+ 0.5- 821/AL 1971 10 26.25764 02 01 49.53 +04 16 49.7 2.0+ 0.4- 821/AL 1971 10 26.73889 02 01 32.29 +04 13 49.6 ( 4.5- 2.1-) 380/kj 1971 10 27.28889 02 01 13.53 +04 10 45.9 0.4+ 0.4- 821/AL 1971 10 28.19688 02 00 42.25 +04 05 32.4 0.4- 0.2- 821/AL 1971 10 28.21076 02 00 41.75 +04 05 27.9 0.2- 0.1+ 821/AL 1971 10 29.25938 02 00 05.61 +03 59 33.9 0.7+ 0.4+ 821/AL 1971 12 20.13171 01 54 05.72 +03 32 43.3 0.7+ 0.5+ 691/ST 1971 12 20.15457 01 54 06.35 +03 32 49.1 0.5+ 0.1+ 691/ST 1972 01 20.10764 02 19 36.83 +06 46 51.3 0.3+ 0.3- 693/CT 1972 01 20.15347 02 19 39.77 +06 47 11.7 0.1- 0.5- 693/CT 1978 07 31.24830 22 57 20.60 -03 38 23.1 0.7- 1.7+ 801/HO 1978 08 30.22222 22 45 43.43 -06 10 21.5 0.1+ 0.7- 801/HO 1978 09 02.11042 22 44 00.28 -06 30 35.1 0.4+ 1.1- 809/ES 1978 09 02.11597 22 44 00.00 -06 30 38.0 0.6- 1.6- 809/ES 1978 09 02.31597 22 43 52.38 -06 32 02.8 0.0 1.0- 809/ES 1978 09 02.32639 22 43 51.90 -06 32 07.5 1.2- 1.3- 809/ES 1978 09 06.10382 22 41 35.16 -06 59 16.9 0.5+ 1.0- 809/ES 1978 09 10.10417 22 39 10.97 -07 28 11.2 0.1+ 0.4+ 809/ES 1978 09 10.12014 22 39 10.40 -07 28 19.8 0.6+ 1.3- 809/ES 1978 09 10.22222 22 39 06.52 -07 29 02.1 0.3+ 0.6+ 809/ES 1978 09 10.23889 22 39 05.92 -07 29 11.1 0.7+ 1.3- 809/ES 1978 09 27.19510 22 30 39.29 -09 22 01.2 2.1+ 1.4- 801/HO 1978 10 31.08021 22 32 53.22 -10 55 06.4 0.2- 0.5+ 801/HO 1985 07 25.34578 20 06 22.81 -13 40 57.6 0.1+ 0.2+ 691/ST 1985 07 25.35582 20 06 22.30 -13 40 59.7 0.4- 0.2+ 691/ST 1985 07 25.36924 20 06 21.65 -13 41 01.9 0.7- 0.7+ 691/ST 1985 07 26.28132 20 05 40.44 -13 44 13.4 0.5+ 1.4+ 691/ST 1985 07 26.29189 20 05 39.94 -13 44 16.1 0.5+ 1.0+ 691/ST 1985 07 26.30332 20 05 39.33 -13 44 18.5 0.6- 1.0+ 691/ST 1985 08 14.18913 19 52 07.55 -14 56 28.5 0.5+ 0.7- 691/ST 1985 08 14.20611 19 52 06.92 -14 56 32.3 1.0+ 0.5- 691/ST 1985 08 14.22385 19 52 06.08 -14 56 36.4 1.1- 0.4- 691/ST 1986 11 06.45534 05 52 15.47 +14 39 10.3 0.8+ 0.7+ 691/ST 1986 11 06.46824 05 52 15.19 +14 39 08.5 0.4- 0.9+ 691/ST 1986 12 04.39178 05 36 48.28 +13 48 08.1 0.3- 0.8- 691/ST 1986 12 04.41709 05 36 47.08 +13 48 06.6 0.4+ 0.9- 691/ST 1986 12 27.32187 05 18 31.04 +13 49 50.0 0.1+ 0.2+ 691/ST 1986 12 27.32542 05 18 30.84 +13 49 49.6 0.5- 0.5- 691/ST 1987 01 29.26086 05 06 17.44 +15 01 33.5 0.1- 1.0- 691/ST 1987 01 29.28244 05 06 17.45 +15 01 37.2 0.0 1.2- 691/ST ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1990 May 2