OAA computing section circular NK 700 26P/Grigg-Skjellerup

The following improved orbital elements, by S. Nakano, are from 191 observations 1952-1997, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 0.89 arc second. Epoch = 1997 Aug. 20.0 TT T = 1997 Aug. 30.30334 +/- 0.00014 (m.e.) TT Peri. = 359.33158 +/- 0.00007 Node = 213.30926 +/- 0.00004 (2000.0) Inc. = 21.08676 +/- 0.00002 q = 0.9968107 +/- 0.0000002 AU e = 0.6638056 +/- 0.0000001 a = 2.9649827 +/- 0.0000003 AU n' = 0.19305045 +/- 0.00000003 P = 5.105 +/- 0.0000007 years A1 = +0.004 +/- 0.002 A2 = -0.00113 +/- 0.00002 T = 1952 Mar. 11.16100 TT Epoch = 1952 Mar. 9.0 TT Peri. = 356.34667 e = 0.7035963 Node = 216.09401 (2000.0) a = 2.8866640 AU Inc. = 17.62240 n'= 0.20096005 q = 0.8556178 AU P = 4.904 years T = 1957 Feb. 2.63343 TT Epoch = 1957 Feb. 11.0 TT Peri. = 356.31395 e = 0.7036390 Node = 216.09943 (2000.0) a = 2.8859736 AU Inc. = 17.63051 n'= 0.20103217 q = 0.8552901 AU P = 4.903 years T = 1961 Dec. 31.35772 TT Epoch = 1962 Jan. 16.0 TT Peri. = 356.36925 e = 0.7029769 Node = 216.07464 (2000.0) a = 2.8878589 AU Inc. = 17.61505 n'= 0.20083533 q = 0.8577608 AU P = 4.908 years T = 1967 Jan. 16.47516 TT Epoch = 1967 Jan. 30.0 TT Peri. = 359.15946 e = 0.6624352 Node = 213.39439 (2000.0) a = 2.9711448 AU Inc. = 21.04405 n'= 0.19245020 q = 1.0029538 AU P = 5.121 years T = 1972 Mar. 2.65281 TT Epoch = 1972 Feb. 13.0 TT Peri. = 359.27077 e = 0.6628374 Node = 213.36071 (2000.0) a = 2.9698077 AU Inc. = 21.06199 n'= 0.19258018 q = 1.0013081 AU P = 5.118 years T = 1977 Apr. 11.00065 TT Epoch = 1977 Apr. 7.0 TT Peri. = 359.31070 e = 0.6647054 Node = 213.35378 (2000.0) a = 2.9627257 AU Inc. = 21.09842 n'= 0.19327109 q = 0.9933860 AU P = 5.100 years T = 1982 May 14.99665 TT Epoch = 1982 May 31.0 TT Peri. = 359.31675 e = 0.6656800 Node = 213.34135 (2000.0) a = 2.9589842 AU Inc. = 21.13128 n'= 0.19363778 q = 0.9892476 AU P = 5.090 years T = 1987 June 18.04606 TT Epoch = 1987 June 14.0 TT Peri. = 359.30559 e = 0.6647126 Node = 213.33560 (2000.0) a = 2.9625424 AU Inc. = 21.10051 n'= 0.19328903 q = 0.9933033 AU P = 5.099 years T = 1992 July 22.13780 TT Epoch = 1992 Aug. 6.0 TT Peri. = 359.26497 e = 0.6643253 Node = 213.34040 (2000.0) a = 2.9632554 AU Inc. = 21.09897 n'= 0.19321927 q = 0.9946898 AU P = 5.101 years The predicted orbit for the 2002 return is as follows: T = 2002 Nov. 29.71796 TT Epoch = 2002 Nov. 22.0 TT Peri. = 1.62376 e = 0.6327097 Node = 211.73989 (2000.0) a = 3.0435711 AU Inc. = 22.34727 n'= 0.18562177 q = 1.1178741 AU P = 5.310 years The following residuals in seconds of arc are from the above orbital elements: 19/ 19/ 19/ 520309 081 (3.4+ 4.7+) 820621 801 1.9+ 0.7+ 920109 695 0.7+ 0.2- 520325 081 (2.9+ 5.5+) 820623 801 1.7+ 0.5+ 920109 695 0.6+ 0.0 520421 711 2.4+ 0.3+ 820624 801 1.7- 1.6- 920109 695 0.5+ 0.1- 561229 388 0.3+ 0.4- 820625 801 0.5- 0.5+ 920109 695 0.5+ 0.0 570102 675 0.0 2.1- 820627 801 0.3- 0.3+ 920109 695 0.5+ 0.1+ 570107 388 (4.8+ 3.2-) 820710 707 1.0- 1.4- 920109 695 0.3+ 0.2- 611109 371 1.5- 1.4+ 820719 801 1.2- 0.0 920109 695 0.4+ 0.1+ 611110 689 1.3- 0.4+ 820723 801 0.0 1.5+ 920109 695 0.4+ 0.0 611118 689 0.7+ 0.6+ 820818 801 2.1- 0.1+ 920109 695 0.6+ 0.0 611204 689 0.3+ 0.3+ 860812 493 0.6+ 0.0 920109 695 0.9+ 0.2+ 661219 675 (2.5+ 3.0-) 860813 493 0.2+ 0.1+ 920524 413 0.6- 2.0+ 661219 675 0.8+ 0.7+ 860813 493 0.1+ 0.1- 920524 413 0.5- 0.5- 720126 805 (7.5- 3.8-) 860813 493 0.2+ 0.2- 920524 413 0.0 0.3+ 720126 805 (6.9- 5.9-) 860813 493 0.1- 0.3- 920529 474 0.1- 1.0+ 720212 691 0.1- 0.6- 870103 691 0.6+ 1.1- 920531 474 0.2+ 1.5+ 720212 691 0.0 0.2- 870103 691 0.1+ 1.9- 920531 474 2.1+ 0.5+ 720513 693 0.6- 1.2+ 870103 691 0.2- 1.3- 920619 474 0.3+ 0.3+ 720513 693 0.1- 0.1- 870131 807 (3.5- 1.5-)Y 920619 474 1.4- 1.8+ 720518 691 0.5+ 0.6+ 870131 807 0.5- 1.5+ Y 920619 413 0.1- 0.1+ 720713 691 0.6- 0.5+ 870201 807 (5.5- 3.9-)Y 920619 413 0.2+ 0.2- 720713 691 1.3- 0.6+ 870201 807 (4.4- 3.1-)Y 920619 413 0.2+ 0.1- 720814 691 1.1- 0.2- 870202 807 (7.1- 3.9-)Y 920620 474 0.2+ 0.3- 720814 691 1.1- 0.4- 870202 807 (5.4- 3.3-)Y 920620 474 0.7- 1.4+ 770121 323 (0.8+ 3.8+) 870227 413 0.6- 0.8+ 920623 474 0.2- 1.3+ 770125 323 0.9- 1.0+ 870302 691 1.5+ 0.5+ 920623 474 1.8+ 2.1+ 770126 485 (3.5- 3.1-) 870302 691 1.8+ 0.0 920624 474 0.5- 0.2+ 770126 485 0.3- 1.6- 870302 691 1.3+ 0.3+ 920624 474 1.4- 0.3+ 770127 323 0.9- 0.9- 870302 691 1.4+ 0.8+ 920625 474 0.8+ 0.9+ 770309 323 1.0+ 0.6- 870302 691 1.0+ 0.5+ 920625 474 1.8+ 0.4+ 770311 485 1.3+ 1.8- 870302 691 0.8+ 0.5+ 920627 474 (2.8- 0.9+) 770311 485 (0.7+ 2.5-) 870303 691 0.1+ 0.1+ 920627 474 0.7- 1.3+ 770314 323 0.6+ 1.5+ 870303 691 0.2+ 0.9+ 920627 474 0.0 0.9+ 770316 323 (3.8+ 1.6-) 870303 691 0.2- 0.2- 920628 474 (1.3- 2.8+) 770317 323 1.0- 0.2- 870327 691 0.9+ 1.2- 920628 474 1.2+ 0.7+ 770318 323 1.6- 0.2- 870327 691 0.7+ 0.9- 920628 474 0.5- 2.2+ 770319 485 (3.6+ 3.1-) 870327 691 1.0+ 0.9- 920629 809 0.5+ 0.0 770319 485 1.0+ 1.8- 870425 691 0.1+ 1.4- 920629 809 0.0 0.1- 770321 323 1.6+ 1.4+ 870425 691 0.0 1.4- 920630 474 (3.3- 0.8-) 770325 323 (1.8+ 5.9-) 870519 323 (0.8+ 8.5+) 920630 474 (2.4- 3.2-) 770325 323 1.1+ 0.8- 870521 493 1.0- 0.2+ 920701 474 (2.2+ 2.5-) 770330 323 (6.5+ 4.1+) 870528 493 0.0 0.1+ 920701 474 0.7- 0.1- 770401 807 1.5+ 1.3+ 870603 493 0.3- 0.4+ 920705 413 0.1- 0.2- 770401 807 (3.1+ 4.5+) 870604 493 0.3- 0.7+ 920705 413 0.0 0.1- 770401 807 (4.0+ 1.7-) 870605 493 0.0 0.1+ 920705 809 0.0 0.0 770416 801 1.4+ 1.0+ 870621 474 0.6- 0.2+ 920706 474 0.8- 1.5+ 770416 882 2.3- 2.1- 870621 474 1.2- 0.2+ 920706 474 (3.2- 1.3+) 770416 882 (1.6- 2.7+) 870622 707 1.7- 0.2+ 920706 474 0.0 0.8- 770420 372 (4.0+ 6.3+)Y 870622 707 0.6- 0.0 920709 809 0.5+ 0.2+ 770420 882 (6.9+ 0.2-) 870622 474 0.2- 0.4+ 920710 809 0.2+ 0.2+ 770420 882 (2.7+ 1.7+) 870622 474 0.6+ 0.2- 920710 809 0.5+ 0.3+ 770421 879 1.4+ 2.1+ Y 870622 474 0.1+ 0.0 920710 809 0.1+ 0.2+ 770422 805 (2.4+ 3.4+) 870628 707 1.2+ 1.1+ 920722 323 (2.7- 4.8+) 770422 485 2.2+ 1.7- 870628 707 0.1+ 0.4+ 920804 493 0.1- 0.4- 770422 485 1.6+ 2.2- 870716 897 (3.6- 10.8+) 920804 493 0.2- 0.3- 770422 485 0.5+ 0.8+ 870718 323 1.0- 2.1+ 920804 493 0.6- 0.4- 770422 323 0.5+ 0.6+ 870720 493 0.7+ 0.1- 920816 323 0.5+ 0.5+ 770428 882 (2.5+ 1.8+) 870728 801 0.3- 0.2- 920823 413 0.3- 0.7- 770428 882 (0.3- 2.7-) 870804 493 0.4- 0.3- 920823 413 0.1- 0.7- 770513 993 1.0- 2.4+ 870813 474 (4.0- 0.3+) 920906 413 0.1- 0.5- 770517 801 0.8- 0.3- 870813 474 0.3- 0.5+ 920906 413 1.0- 0.2- 770520 993 (4.3+ 0.5-) 870818 691 2.2+ 0.6- 920923 493 0.5- 0.9- 770520 879 (3.7- 2.1+) 870818 691 2.2+ 0.3- 921012 413 1.5- 0.4+ 770616 801 0.8- 0.2- 870818 691 (2.8+ 0.1-) 921012 413 0.7- 0.2+ 770810 801 (3.7- 0.4+) 870821 801 (0.2+ 2.6+) 930914 493 0.0 0.5- 820115 675 0.3+ 0.1- 870926 474 0.3+ 1.0+ 930915 493 1.0- 0.6- 820116 675 0.8- 0.5+ 870926 474 0.4- 2.4- 930915 493 0.6- 0.1+ 820323 801 0.5- 0.3- 870927 691 0.0 1.4- 930916 493 0.4+ 0.9+ 820326 801 0.1+ 0.6+ 870927 691 0.0 1.3- 930916 493 0.6- 0.5- 820401 675 0.4- 0.2- 880911 568 (3.1- 1.2+) 930916 493 0.6- 0.4- 820411 707 0.4- 0.3+ 880911 568 (3.2- 1.2+) 930917 493 0.6- 0.7- 820413 801 0.1- 0.7+ 891227 568 (3.0+ 0.8+) 961214 691 0.7- 0.3+ 820419 801 0.4- 0.3- 910909 493 0.9+ 0.6- 961214 691 1.0- 0.6+ 820429 801 0.5- 0.4- 910912 493 0.4+ 0.7- 961215 691 0.9- 0.0 820519 801 0.5+ 0.5+ 910912 493 0.7+ 0.6- 961215 691 0.9- 0.0 820613 707 0.6+ 1.0- 911108 695 0.7+ 1.1- 961215 691 0.8- 0.2+ 820614 372 0.2+ 0.1- 911108 695 0.7+ 1.0- 970117 691 (2.9- 0.0 ) 820618 491 0.3- 1.0- 911108 695 0.7+ 0.9- 970117 691 (2.6- 0.3+) 820619 491 2.3- 0.6+ 911108 695 0.9+ 0.9- 970117 691 (2.9- 0.4+) 820619 801 0.7+ 0.9- 920109 695 0.5+ 0.2- 971027 897 (0.3- 3.1-) 820619 801 1.0+ 2.2- 920109 695 0.5+ 0.1- 971027 897 0.0 0.7+ ( ) -------- Rejected Obs.

Director, Computing Section Computed date Syuichi Nakano 1997 Dec. 12

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