OAA computing section circular NK 685 133P=(7968) Elst-Pizarro
The following improved orbital elements, by S. Nakano, are from 175 observations 1979-1997. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.61 arc second. Epoch = 1996 Apr. 27.0 TT T = 1996 Apr. 18.48086 +/- 0.00078 (m.e.) TT Peri. = 133.33217 +/- 0.00053 Node = 160.26326 +/- 0.00043 (2000.0) Inc. = 1.38458 +/- 0.00003 q = 2.6277004 +/- 0.0000056 AU e = 0.1674466 +/- 0.0000018 a = 3.1561945 +/- 0.0000030 AU n' = 0.17577554 +/- 0.00000025 P = 5.607 +/- 0.0000081 years T = 1979 July 13.79715 TT Epoch = 1979 July 26.0 TT Peri. = 135.67665 e = 0.1668598 Node = 160.40536 (2000.0) a = 3.1552043 AU Inc. = 1.38129 n'= 0.17585829 q = 2.6287275 AU P = 5.605 years T = 1985 Feb. 14.23708 TT Epoch = 1985 Feb. 24.0 TT Peri. = 135.08629 e = 0.1685889 Node = 160.35470 (2000.0) a = 3.1564503 AU Inc. = 1.38221 n'= 0.17575417 q = 2.6243079 AU P = 5.608 years T = 1990 Sept.16.52101 TT Epoch = 1990 Sept.26.0 TT Peri. = 134.22944 e = 0.1672280 Node = 160.32800 (2000.0) a = 3.1553932 AU Inc. = 1.38406 n'= 0.17584250 q = 2.6277229 AU P = 5.605 years The predicted orbit for the 2001 return is as follows: T = 2001 Nov. 23.67505 TT Epoch = 2001 Nov. 27.0 TT Peri. = 132.99973 e = 0.1653648 Node = 160.23016 (2000.0) a = 3.1575440 AU Inc. = 1.38548 n'= 0.17566287 q = 2.6353975 AU P = 5.611 years The following residuals in seconds of arc are from the above orbital elements: 1979/ 960824 422 1.3- 0.8- 960919 046 1.1+ 0.4+ 790724 413 0.1+ 1.3- 960824 422 (3.9- 1.6-) 960921 691 0.4- 0.1+ 790725 675 1.0+ 0.3+ 960824 422 0.1- 0.5- 960921 691 0.3- 0.1+ 1985/ 960825 763 1.5- 0.6+ 960921 691 0.5- 0.1+ 850915 413 1.7- 0.1+ 960825 817 0.4- 0.2+ 960921 696 0.8+ 0.0 850915 413 (6.9- 2.7-) 960825 817 0.5- 0.0 960921 696 0.8+ 0.0 1996/ 960825 763 0.9- 0.7- 960921 696 0.9+ 0.1+ 960714 809 1.2+ 1.4- 960825 763 (3.8- 1.5-) 960930 118 1.9+ 0.3- 960714 809 0.4+ 1.6- 960825 658 0.1+ 0.4- 961001 372 1.8- 1.1+ 960714 809 (0.1- 2.0-) 960825 658 0.4- 0.2- 961001 413 0.7+ 0.1+ 960716 809 1.4+ 0.3+ 960825 658 0.3- 0.3- 961001 413 0.8+ 0.4+ 960716 809 0.8+ 0.0 960826 763 0.5- 0.4+ 961001 413 0.6+ 0.1+ 960716 809 0.2- 0.7- 960830 046 0.7- 0.2+ 961003 118 0.9+ 0.3+ 960808 809 0.1+ 0.2- 960830 046 0.4- 0.2+ 961003 118 1.2+ 0.7+ 960808 809 0.1+ 0.4- 960830 046 0.4- 0.3- 961003 118 1.0+ 0.6+ 960808 809 0.6- 0.1- 960902 372 1.0- 0.2- 961003 046 0.2+ 0.0 960808 010 1.1+ 1.2+ 960902 360 0.7- 0.4- 961003 046 0.5+ 0.5+ 960808 010 (0.8+ 2.2+) 960902 360 0.7- 0.4- 961003 046 0.2+ 0.3+ 960809 010 (2.6- 1.1+) 960902 360 0.4- 0.5- 961004 360 0.8+ 0.4+ 960809 809 1.0+ 0.2+ 960903 372 0.3- 0.2- 961004 372 0.2- 1.1+ 960809 809 0.6+ 0.9+ 960906 421 0.2- 0.5- 961004 360 0.6+ 0.3+ 960809 809 0.1- 0.2+ 960906 421 0.7- 0.2+ 961004 360 0.0 0.2+ 960817 010 (1.0- 2.0-) 960906 421 0.5- 0.1- 961013 801 1.3+ 1.3- 960817 010 0.4+ 0.6- 960906 587 0.6- 0.1- 961013 801 1.9- 0.1+ 960817 010 0.5- 0.7+ 960906 587 1.4- 0.6+ 961014 046 0.5- 0.1+ 960820 012 (2.5- 1.5-)Y 960907 046 0.4- 0.0 961014 046 0.3+ 0.3+ 960820 046 0.1+ 0.3- 960907 046 0.3+ 0.0 961014 046 0.3- 0.6+ 960820 046 0.2+ 0.5- 960908 809 (2.2+ 2.5+) 961015 372 1.2- 0.4+ 960820 046 0.4+ 0.0 960908 809 (1.8+ 2.5+) 961016 360 0.7+ 0.7+ 960820 046 0.1+ 0.3- 960908 809 1.3+ 1.9+ 961016 360 0.6+ 0.6+ 960821 046 0.0 0.1- 960908 587 0.0 0.2- 961018 691 0.7- 0.1+ 960821 046 0.2- 0.2- 960909 709 0.2+ 0.4+ 961018 691 0.7- 0.3+ 960821 046 0.1- 0.2- 960909 709 0.5+ 0.5+ 961108 587 0.2+ 0.3- 960821 709 0.6+ 0.0 960909 709 0.7+ 0.5+ 961214 691 0.8+ 0.8+ 960821 709 0.3+ 0.2- 960909 709 0.2+ 0.4+ 961214 691 0.7+ 0.6+ 960821 709 0.3- 0.2- 960909 557 0.3- 0.2+ 961214 691 1.0+ 0.7+ 960821 709 0.1- 0.3- 960909 557 0.3- 0.2- 961215 691 0.7+ 0.1- 960821 709 0.0 0.4- 960910 372 1.2- 0.8- 961215 691 0.2+ 0.2- 960821 557 0.1+ 0.6- 960913 422 0.1+ 0.3+ 961215 691 0.4+ 0.1- 960821 557 0.0 0.3- 960913 422 0.2- 0.1+ 1997/ 960822 046 0.5- 0.5- 960913 422 0.6- 0.0 971003 709 (0.7- 2.1-) 960822 046 0.1- 0.6- 960914 360 0.2+ 1.1+ 971003 709 0.5+ 1.7+ 960822 046 0.1- 0.5- 960914 360 0.2- 1.1+ 971004 709 0.0 0.4- 960822 587 0.4- 0.5- 960914 360 0.4+ 1.3+ 971004 709 0.1+ 0.7- 960822 557 0.2- 0.4- 960914 372 0.0 0.1+ 971004 709 0.4- 0.4- 960822 557 0.4- 0.4- 960917 540 0.8+ 0.5+ 971004 709 0.0 0.4- 960822 587 0.7- 0.9- 960917 540 1.2- 0.1- 971004 709 0.3+ 0.4- 960822 587 1.0- 0.9- 960918 381 0.6+ 0.0 971010 691 1.2- 0.8- 960823 817 0.7- 0.2- 960918 381 0.6+ 0.0 971010 691 0.7- 0.1- 960823 817 0.2+ 0.7- 960918 381 0.1- 0.4- 971010 691 0.4- 0.5- 960823 817 0.7+ 0.4- 960918 381 0.6+ 0.0 971012 867 0.7- 1.0- 960823 817 0.4- 0.1- 960918 381 0.2+ 0.1- 971012 867 0.1+ 0.4- 960823 046 0.3- 0.0 960918 381 0.4+ 0.1+ 971029 709 1.7+ 0.2+ 960823 046 0.6+ 0.1+ 960918 381 0.8+ 0.0 971029 709 0.9+ 0.1- 960823 046 0.5+ 0.0 960918 372 0.2+ 0.8+ 971029 709 1.4+ 0.0 960823 046 0.2+ 0.0 960918 118 0.2+ 0.6+ 971029 709 1.0+ 0.1- 960823 587 1.0- 0.5- 960918 118 0.7+ 0.1+ 971029 709 0.2+ 0.4- 960823 587 0.9- 0.1- 960918 118 0.5+ 0.2+ 971108 696 0.5- 0.1+ 960823 587 1.0- 0.3+ 960919 691 0.3- 0.2+ 971108 696 0.3- 0.2+ 960823 587 0.8- 0.2- 960919 691 0.6- 0.3+ 971108 696 0.4- 0.1+ 960824 658 0.2- 0.4- 960919 381 0.6+ 0.1- 971125 691 0.2- 0.3- 960824 658 0.8- 0.5- 960919 046 0.8+ 0.6+ 971125 691 0.2- 0.0 960824 658 0.3- 0.4- 960919 046 1.0+ 0.3+ 971125 691 0.6- 0.1+ 960824 372 (3.6- 0.9-) 960919 046 0.6+ 0.2- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1998 May 2