OAA computing section circular NK 846 91P/Russell 3
The following improved orbital elements, by S. Nakano, are from 115 observations 1983 to 1998, 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 +/- 0.75 arc second. Epoch = 1997 Nov. 8.0 TT T = 1997 Nov. 19.22074 +/- 0.00324 (m.e.) TT Peri. = 353.43074 +/- 0.00073 Node = 248.67183 +/- 0.00012 (2000.0) Inc. = 14.09577 +/- 0.00002 q = 2.5100678 +/- 0.0000024 AU e = 0.3440956 +/- 0.0000005 a = 3.8268808 +/- 0.0000012 AU n' = 0.13165479 +/- 0.00000006 P = 7.486 +/- 0.0000035 years A1 = +3.789 +/- 0.553 A2 = +0.56822 +/- 0.00734 T = 1982 Nov. 23.27318 TT Epoch = 1982 Nov. 7.0 TT Peri. = 353.43699 e = 0.3445341 Node = 248.72600 (2000.0) a = 3.8298369 AU Inc. = 14.09594 n'= 0.13150239 q = 2.5103273 AU P = 7.495 years T = 1990 May 17.90162 TT Epoch = 1990 May 29.0 TT Peri. = 353.19750 e = 0.3432708 Node = 248.74186 (2000.0) a = 3.8330065 AU Inc. = 14.08580 n'= 0.13133931 q = 2.5172474 AU P = 7.504 years The predicted orbit for the 2005 return is as follows: T = 2005 June 26.83337 TT Epoch = 2005 July 9.0 TT Peri. = 354.70250 e = 0.3307901 Node = 247.89696 (2000.0) a = 3.8880531 AU Inc. = 14.09241 n'= 0.12855998 q = 2.6019237 AU P = 7.667 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1983/ 890102 675 0.2- 0.0 970416 691 0.1+ 0.5- 830614 413 (0.3+ 2.6+) 890102 675 1.2- 0.1+ 970416 691 0.3- 0.1+ 830614 413 (0.7+ 4.1+) 890102 675 0.0 0.3- 970416 691 0.1- 0.0 830615 413 0.1+ 2.3+ 890102 675 0.2+ 0.1- 970424 402 0.1- 0.2- 830617 675 0.1+ 0.9+ 1990/ 970424 402 0.1+ 0.0 830618 675 0.4+ 0.6+ 900526 897 0.0 0.8+ 970424 402 0.8+ 0.9+ 830618 372 0.3- 1.5- 900526 897 0.4+ 1.0+ 970429 360 0.1+ 0.1+ 830618 372 0.8- 2.0- 900526 372 0.2+ 0.5- 970429 360 0.1+ 0.2- 830620 675 0.3+ 0.9+ 900528 372 1.1- 1.8+ 970509 360 0.3+ 1.1- 830621 372 2.2- 0.3- 1996/ 970509 360 0.4+ 0.7- 830703 707 0.2- 0.7+ 961118 691 (2.2- 0.3+) 970531 691 0.2- 1.3- 830704 474 1.0+ 1.2+ 961118 691 1.6- 0.1- 970531 691 0.1- 1.5- 830704 474 0.4- 1.2- 961118 691 2.0- 0.2+ 970531 691 0.7+ 1.5- 830704 413 (0.8+ 3.5+) 961119 691 0.6+ 0.4- 1998/ 830705 474 1.2+ 0.7- 961119 691 0.5- 0.1+ 980521 867 0.3+ 0.1- 830705 474 1.3+ 0.1+ 961119 691 0.4+ 0.6- 980521 867 0.2- 0.3- 830710 801 0.3- 0.9- 961221 402 0.7- 0.8+ 980524 691 1.2- 0.3- 830714 413 0.3- 1.4+ 961221 402 0.5+ 0.9+ 980524 691 1.1- 0.0 830714 413 (2.8- 1.2+) 961221 402 1.6- 0.1+ 980526 118 0.5- 0.7- 830715 801 0.2+ 0.2+ 1997/ 980526 118 0.3- 0.5- 830717 046 1.9- 0.6+ 970218 118 0.5+ 0.8+ 980527 867 0.3- 0.4- 830718 046 0.3- 0.6+ 970304 360 0.1- 0.0 980527 867 0.7- 1.1- 830731 046 1.3- 0.4- 970304 360 0.2+ 0.1+ 980527 867 0.5- 0.3- 830731 046 1.0+ 0.9+ 970304 118 0.1+ 0.2+ 980529 118 (2.2- 0.2-) 830801 675 1.1+ 0.3- 970304 118 0.2- 0.1+ 980619 696 0.0 0.4- 830802 675 1.0+ 0.9- 970305 402 1.0- 0.6- 980619 696 0.2+ 0.4- 830808 046 (2.7- 0.9+) 970305 402 0.5+ 0.6- 980619 696 0.0 0.3- 830808 046 (2.7- 2.1-) 970305 402 0.7- 0.7+ 980703 402 0.4+ 0.5- 830809 046 (3.1+ 0.2-) 970305 118 0.7- 0.7- 980703 402 0.1- 0.1+ 830809 046 0.0 0.2- 970305 118 0.2- 1.0- 980703 402 0.0 0.4- 830814 801 0.2- 1.0- 970331 360 0.8+ 0.3- 980720 046 0.3+ 0.1+ 830816 801 0.2+ 0.2+ 970331 360 0.8+ 0.6- 980720 046 0.1- 0.2- 830901 707 1.5+ 1.6+ 970331 867 0.3+ 0.1+ 980720 046 0.7+ 0.6- 830904 801 0.8- 0.0 970331 867 0.7+ 0.1+ 980726 118 0.5+ 0.5- 830908 801 0.6+ 0.2- 970331 867 0.5+ 0.1+ 980726 118 0.7+ 0.1- 831003 801 0.4- 0.3- 970401 118 1.2+ 1.0- 980727 691 0.3+ 0.1+ 831009 801 0.7- 0.3+ 970401 118 1.2+ 0.5- 980727 691 0.2+ 0.2+ 831031 801 1.2- 2.0- 970402 118 0.3+ 0.1- 980727 691 0.4+ 0.4+ 1989/ 970402 118 0.6+ 0.2+ 980819 504 1.6- 0.7+ 890101 675 0.3+ 0.3- 970405 620 0.1- 0.9+ 980819 504 (2.2- 1.2+) 890101 675 0.1+ 0.3+ 970405 620 1.0- 0.4+ 980916 693 1.4+ 0.2- 890101 675 0.2+ 0.1- 970405 620 1.1- 1.0+ 980916 693 1.5+ 0.1- 890101 675 0.5+ 0.4- 970406 620 0.8- 0.5+ 980916 693 1.6+ 0.1- 890101 675 0.5+ 0.3- 970406 620 1.6- 1.0+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2002 May 7