OAA computing section circular NK 527 Periodic Comet Grigg-Skjellerup
The following improved orbital elements, by S. Nakano, are from 118 observations 1961 to 1987, including full planetary per- turbations and non-gravitational effect of style II. The mean residual is +/- 1.10 arc seconds. On 1964 March 17, the comet passed 0.33 AU from Jupiter. Epoch = 1987 June 14.0 ET T = 1987 June 18.04608 +/- 0.00009 (m.e.) ET Peri. = 359.31670 +/- 0.00009 Node = 212.62669 +/- 0.00005 (1950.0) Inc. = 21.10570 +/- 0.00003 q = 0.9933030 +/- 0.0000002 AU e = 0.6647127 +/- 0.0000001 a = 2.9625423 +/- 0.0000001 AU nß = 0.19328904 +/- 0.00000001 P = 5.099 +/- 0.0000002 years A1 = +0.005 +/- 0.004 A2 = -0.00110 +/- 0.00004 T = 1961 Dec. 31.35783 ET Epoch = 1962 Jan. 16.0 ET Peri. = 356.38339 e = 0.7029764 Node = 215.36268 (1950.0) a = 2.8878598 AU Inc. = 17.62010 nß= 0.20083524 q = 0.8577624 AU P = 4.908 years T = 1967 Jan. 16.47505 ET Epoch = 1967 Jan. 30.0 ET Peri. = 359.17064 e = 0.6624353 Node = 212.68544 (1950.0) a = 2.9711444 AU Inc. = 21.04923 nß= 0.19245023 q = 1.0029535 AU P = 5.121 years T = 1972 Mar. 2.65267 ET Epoch = 1972 Feb. 13.0 ET Peri. = 359.28193 e = 0.6628375 Node = 212.65178 (1950.0) a = 2.9698074 AU Inc. = 21.06717 nß= 0.19258020 q = 1.0013078 AU P = 5.118 years T = 1977 Apr. 11.00052 ET Epoch = 1977 Apr. 7.0 ET Peri. = 359.32182 e = 0.6647055 Node = 212.64486 (1950.0) a = 2.9627255 AU Inc. = 21.10361 nß= 0.19327112 q = 0.9933857 AU P = 5.100 years T = 1982 May 14.99656 ET Epoch = 1982 May 31.0 ET Peri. = 359.32785 e = 0.6656801 Node = 212.63246 (1950.0) a = 2.9589841 AU Inc. = 21.13647 nß= 0.19363780 q = 0.9892473 AU P = 5.090 years The predicted orbit for the 1992 return is as follows: T = 1992 July 22.13796 ET Epoch = 1992 Aug. 6.0 ET Peri. = 359.27608 e = 0.6643254 Node = 212.63149 (1950.0) a = 2.9632554 AU Inc. = 21.10416 nß= 0.19321928 q = 0.9946894 AU P = 5.101 years - continued - P/Grigg-Skjellerup NK 527 - 2 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 ¡ , " " " 1961 11 09.83847 11 53 09.88 -12 07 26.9 1.6- 1.5+ 371/TA 1961 11 10.51193 11 56 06.65 -12 22 15.0 1.3- 0.5+ 689/FS 1961 11 18.52213 12 32 45.58 -15 13 51.9 0.7+ 0.6+ 689/FS 1961 12 04.53284 13 54 37.91 -20 00 30.9 0.4+ 0.3+ 689/FS 1966 12 19.52847 14 25 23.66 -23 19 17.9 2.1+ 2.9- 675/PL 1966 12 19.54375 14 25 28.09 -23 19 21.0 0.4+ 0.7+ 675/PL 1972 01 26.32159 14 53 13.88 -36 11 17.4 ( 8.0- 3.6-) 805/EL 1972 01 26.33027 14 53 17.21 -36 11 20.4 ( 7.4- 5.7-) 805/EL 1972 02 12.52460 16 42 59.49 -33 12 26.2 0.8- 0.6- 691/ST 1972 02 12.53553 16 43 03.50 -33 12 11.8 0.5- 0.2- 691/ST 1972 05 13.40833 21 42 59.48 +12 40 57.5 1.2- 0.9+ 693/CT 1972 05 13.44792 21 43 02.38 +12 41 46.1 0.7- 0.4- 693/CT 1972 05 18.45058 21 48 45.85 +14 23 02.5 0.0 0.2+ 691/ST 1972 07 13.36626 21 47 34.75 +24 41 06.8 0.9- 0.2+ 691/ST 1972 07 13.40972 21 47 31.88 +24 41 06.9 1.5- 0.4+ 691/ST 1972 08 14.26806 21 09 27.52 +20 35 39.3 1.5- 0.4- 691/ST 1972 08 14.33160 21 09 23.14 +20 34 45.0 1.5- 0.7- 691/ST 1977 01 21.73495 09 44 43.84 -37 55 23.1 ( 0.7+ 4.0+) 323/PR 1977 01 25.61562 09 47 12.46 -40 14 18.5 1.0- 1.3+ 323/PR 1977 01 26.53805 09 47 47.15 -40 47 55.8 ( 3.6- 2.8-) 485/CA 1977 01 26.58183 09 47 48.87 -40 49 30.3 0.4- 1.3- 485/CA 1977 01 27.74375 09 48 33.75 -41 32 06.9 1.0- 0.6- 323/PR 1977 03 09.71466 11 45 28.75 -72 52 06.8 1.0+ 0.3- 323/PR 1977 03 11.42867 12 12 09.27 -74 23 59.4 1.3+ 1.6- 485/CA 1977 03 11.44969 12 12 30.83 -74 25 06.8 0.7+ 2.3- 485/CA 1977 03 14.74267 13 27 24.52 -76 43 20.0 0.5+ 1.7+ 323/PR 1977 03 16.72083 14 28 54.07 -77 15 12.8 ( 3.6+ 1.6-) 323/PR 1977 03 17.68246 15 01 34.94 -77 09 02.2 1.2- 0.1- 323/PR 1977 03 18.63021 15 34 00.83 -76 46 48.2 1.8- 0.1- 323/PR 1977 03 19.47837 16 02 08.61 -76 13 00.5 ( 3.4+ 3.2-) 485/CA 1977 03 19.49354 16 02 37.09 -76 12 18.2 0.8+ 1.8- 485/CA 1977 03 21.64705 17 05 34.27 -73 48 03.3 1.5+ 1.5+ 323/PR 1977 03 25.79736 18 26 11.98 -66 01 48.6 ( 1.6+ 6.0-) 323/PR 1977 03 25.85250 18 26 56.57 -65 54 20.8 1.0+ 0.7- 323/PR 1977 03 30.78872 19 16 43.86 -53 09 32.6 ( 6.3+ 4.1+) 323/PR 1977 04 01.35556 19 27 00.51 -48 41 01.6 1.4+ 1.3+ 807/CE 1977 04 01.39722 19 27 14.80 -48 33 49.3 ( 3.1+ 4.5+) 807/CE 1977 04 01.40764 19 27 18.37 -48 32 07.8 ( 3.9+ 1.7-) 807/CE 1977 04 16.35716 20 16 54.16 -09 27 45.9 1.0+ 0.7+ 801/HO 1977 04 16.78507 20 17 41.82 -08 36 30.5 2.7- 2.4- 882/sz 1977 04 16.78854 20 17 42.22 -08 36 01.2 1.9- 2.3+ 882/sz 1977 04 20.77431 20 24 20.3 -01 25 05 ( 4.1+ 5.7+) 372/sk Y 1977 04 20.77986 20 24 20.79 -01 24 39.6 ( 6.5+ 0.7-) 882/sz 1977 04 20.78507 20 24 20.93 -01 24 07.0 2.3+ 1.2+ 882/sz 1977 04 21.7889 20 25 48.9 +00 12 01 1.3+ 1.6+ 879/fr Y - continued - P/Grigg-Skjellerup NK 527 - 3 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1977 04 22.32032 20 26 34.31 +01 01 42.8 2.0+ 2.9+ 805/EL 1977 04 22.72564 20 27 06.88 +01 38 15.7 1.8+ 2.2- 485/CA 1977 04 22.72917 20 27 07.09 +01 38 34.1 1.2+ 2.7- 485/CA 1977 04 22.74200 20 27 07.94 +01 39 45.9 0.1+ 0.3+ 485/CA 1977 04 22.81708 20 27 15.02 +01 46 22.6 0.0 0.1+ 323/PR 1977 04 28.77535 20 34 18.06 +09 27 44.7 2.0+ 1.2+ 882/sz 1977 04 28.78750 20 34 18.52 +09 28 29.5 ( 0.7- 3.2-) 882/sz 1977 05 13.99551 20 44 41.23 +22 03 20.8 1.4- 2.0+ 993/WL 1977 05 17.34044 20 45 35.47 +23 57 22.6 1.2- 0.6- 801/HO 1977 05 20.02352 20 45 58.24 +25 18 59.6 ( 3.9+ 1.0-) 993/WL 1977 05 20.68125 20 46 00.13 +25 37 57.2 ( 4.1- 1.6+) 879/fr 1977 06 16.24991 20 31 49.24 +32 54 25.3 1.1- 0.6- 801/HO 1977 08 10.17636 19 33 41.44 +21 48 24.5 ( 4.1- 0.2+) 801/HO 1982 01 15.28683 07 12 47.75 -20 35 52.8 0.5+ 0.1+ 675/PL 1982 01 16.31669 07 11 13.06 -20 46 14.3 0.6- 0.6+ 675/PL 1982 03 23.07213 06 21 08.69 -12 32 16.8 0.4- 0.4- 801/HO 1982 03 26.01641 06 24 00.13 -11 31 28.5 0.2+ 0.6+ 801/HO 1982 04 01.15702 06 31 36.83 -09 16 25.9 0.3- 0.2- 675/PL 1982 04 11.15243 06 48 53.24 -05 08 03.1 0.5- 0.2+ 707/ev 1982 04 13.05104 06 52 52.85 -04 15 51.7 0.2- 0.6+ 801/HO 1982 04 19.04161 07 07 05.54 -01 17 50.4 0.5- 0.3- 801/HO 1982 04 29.07513 07 37 08.99 +04 37 33.5 0.8- 0.5- 801/HO 1982 04 29.07513 07 37 08.99 +04 37 33.5 0.8- 0.5- 801/HO 1982 05 19.08647 09 10 35.67 +21 06 09.5 0.2+ 0.3+ 801/HO 1982 06 13.21493 12 36 02.59 +38 36 15.3 0.6+ 0.9- 707/ev 1982 06 14.58090 12 48 03.42 +38 48 04.6 0.1+ 0.2- 372/sk 1982 06 18.95102 13 24 46.61 +38 52 05.2 0.3- 1.1- 491/CN 1982 06 19.05422 13 25 35.76 +38 51 32.3 2.4- 0.6+ 491/CN 1982 06 19.15278 13 26 23.83 +38 51 07.4 0.8+ 0.9- 801/HO 1982 06 19.15906 13 26 26.83 +38 51 03.9 1.0+ 2.3- 801/HO 1982 06 21.08120 13 41 30.60 +38 37 41.8 1.9+ 0.6+ 801/HO 1982 06 23.11584 13 56 40.18 +38 15 26.9 1.7+ 0.3+ 801/HO 1982 06 24.07970 14 03 34.18 +38 02 21.8 1.6- 1.6- 801/HO 1982 06 25.07668 14 10 30.94 +37 47 20.2 0.4- 0.4+ 801/HO 1982 06 27.19014 14 24 34.61 +37 10 43.0 0.2- 0.2+ 801/HO 1982 07 10.18889 15 33 48.05 +32 00 19.4 1.0- 1.7- 707/ev 1982 07 19.10657 16 08 13.49 +27 53 10.3 1.4- 0.3- 801/HO 1982 07 23.13571 16 21 27.31 +26 00 48.4 0.1- 1.2+ 801/HO 1982 08 18.10843 17 27 43.78 +15 01 17.1 2.5- 0.2- 801/HO 1986 08 12.16108 05 49 51.61 +11 24 17.6 0.7+ 0.1+ 493/CL 1986 08 13.14881 05 51 00.12 +11 20 52.0 0.4+ 0.1+ 493/CL 1986 08 13.16026 05 51 00.90 +11 20 49.5 0.3+ 0.0 493/CL 1986 08 13.16859 05 51 01.48 +11 20 47.6 0.3+ 0.2- 493/CL 1986 08 13.17492 05 51 01.90 +11 20 46.2 0.1+ 0.3- 493/CL 1987 01 03.27785 06 19 29.83 -10 26 41.4 1.0+ 1.0- 691/ST 1987 01 03.28784 06 19 28.92 -10 26 45.9 0.5+ 1.7- 691/ST 1987 01 03.29368 06 19 28.39 -10 26 47.6 0.2+ 1.2- 691/ST 1987 01 31.08889 05 42 52.3 -10 49 53 ( 3.1- 1.6-) 807/CE Y 1987 01 31.19028 05 42 46.1 -10 49 22 0.0 1.8+ 807/CE Y 1987 02 01.10486 05 41 51.3 -10 45 12 ( 5.1- 3.6-) 807/CE Y - continued - P/Grigg-Skjellerup NK 527 - 4 Date/ UT R.A. (1950) Decl. *** O-C *** Code/Obs. h m s ¡ , " " " 1987 02 01.19306 05 41 46.0 -10 44 46 ( 3.9- 3.5-) 807/CE Y 1987 02 02.07083 05 40 55.5 -10 40 24 ( 6.8- 3.6-) 807/CE Y 1987 02 02.20208 05 40 47.9 -10 39 43 ( 4.8- 3.5-) 807/CE Y 1987 03 02.10244 05 30 44.01 -06 43 02.5 1.6+ 0.5+ 691/ST 1987 03 02.10698 05 30 44.09 -06 43 00.1 2.0+ 0.0 691/ST 1987 03 02.11150 05 30 44.11 -06 42 56.8 1.4+ 0.4+ 691/ST 1987 03 02.12355 05 30 44.27 -06 42 48.6 1.6+ 0.8+ 691/ST 1987 03 02.13177 05 30 44.35 -06 42 43.6 1.2+ 0.5+ 691/ST 1987 03 02.13774 05 30 44.41 -06 42 39.7 1.0+ 0.5+ 691/ST 1987 03 03.09978 05 31 00.18 -06 32 16.2 0.3+ 0.2+ 691/ST 1987 03 03.10897 05 31 00.32 -06 32 09.4 0.4+ 1.0+ 691/ST 1987 03 03.17977 05 31 01.38 -06 31 24.3 0.0 0.1- 691/ST 1987 03 27.11169 05 50 15.57 -01 57 31.7 0.9+ 1.1- 691/ST 1987 03 27.12318 05 50 16.43 -01 57 23.3 0.8+ 0.8- 691/ST 1987 03 27.12841 05 50 16.84 -01 57 19.7 1.0+ 0.9- 691/ST 1987 04 25.13215 06 44 20.09 +03 33 23.4 0.1+ 1.4- 691/ST 1987 04 25.13944 06 44 21.14 +03 33 28.1 0.1+ 1.5- 691/ST 1987 05 19.49167 07 56 04.14 +07 48 56.0 ( 0.6+ 8.5+) 323/PR 1987 05 21.86883 08 04 27.08 +08 12 05.2 1.2- 0.2+ 493/CL 1987 05 28.86528 08 30 38.77 +09 19 01.6 0.0 0.0 493/CL 1987 06 03.86840 08 54 56.32 +10 13 17.5 0.4- 0.3+ 493/CL 1987 06 04.87726 08 59 11.12 +10 22 03.2 0.4- 0.5+ 493/CL 1987 06 05.87014 09 03 24.67 +10 30 33.0 0.1- 0.0 493/CL 1987 06 21.30346 10 14 39.07 +12 22 37.6 0.7- 0.1+ 474/JN 1987 06 21.31683 10 14 42.95 +12 22 42.0 1.3- 0.1+ 474/JN 1987 06 22.17674 10 18 57.95 +12 27 11.4 1.9- 0.1+ 707/ev 1987 06 22.18785 10 19 01.33 +12 27 14.6 0.7- 0.2- 707/ev 1987 06 22.30242 10 19 35.72 +12 28 05.3 0.3- 0.2+ 474/JN 1987 06 22.30797 10 19 37.41 +12 28 06.5 0.4+ 0.4- 474/JN 1987 06 22.31527 10 19 39.54 +12 28 08.9 0.0 0.3- 474/JN 1987 06 28.17153 10 49 18.69 +12 53 53.0 1.1+ 0.8+ 707/ev 1987 06 28.18889 10 49 23.97 +12 53 55.8 0.1+ 0.2+ 707/ev 1987 07 16.50682 12 26 21.92 +12 51 09.9 (11.3- 5.4+) 897/kj 1987 07 18.48403 12 36 52.02 +12 42 19.0 1.0- 1.9+ 323/PR 1987 07 20.87153 12 49 28.04 +12 29 05.9 0.6+ 0.3- 493/CL 1987 07 28.06696 13 26 42.66 +11 36 04.1 0.3- 0.5- 801/HO 1987 08 04.85868 14 05 16.96 +10 18 54.4 0.5- 0.5- 493/CL 1987 08 13.36911 14 44 44.85 +08 38 49.9 ( 4.2- 0.0 ) 474/JN 1987 08 13.38266 14 44 48.70 +08 38 39.9 0.5- 0.1+ 474/JN 1987 08 18.16198 15 05 39.37 +07 37 56.4 2.1+ 1.0- 691/ST 1987 08 18.17253 15 05 42.04 +07 37 48.6 2.0+ 0.6- 691/ST 1987 08 18.19684 15 05 48.25 +07 37 30.0 2.6+ 0.4- 691/ST 1987 08 21.04428 15 17 45.96 +07 00 46.9 0.1+ 2.2+ 801/HO 1987 09 26.36141 17 24 48.38 +00 04 37.7 0.0 0.7+ 474/JN 1987 09 26.39197 17 24 53.73 +00 04 18.1 0.7- 2.7- 474/JN 1987 09 27.12194 17 27 03.26 -00 02 12.0 0.3- 1.6- 691/ST 1987 09 27.14513 17 27 07.32 -00 02 24.0 0.4- 1.5- 691/ST ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1988 November 3