OAA computing section circular NK 771R 149P/Mueller 4

The following improved orbital elements, by S. Nakano, are from 101 observations 1992 to 2001. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.81 arc second. Epoch = 2001 Feb. 20.0 TT T = 2001 Feb. 7.83929 +/- 0.00745 (m.e.) TT Peri. = 43.60429 +/- 0.00211 Node = 145.36862 +/- 0.00020 (2000.0) Inc. = 29.74885 +/- 0.00008 q = 2.6466933 +/- 0.0000097 AU e = 0.3885989 +/- 0.0000022 a = 4.3288988 +/- 0.0000051 AU n' = 0.10943039 +/- 0.00000019 P = 9.007 +/- 0.0000160 years T = 1992 Feb. 16.10985 TT Epoch = 1992 Feb. 28.0 TT Peri. = 43.52160 e = 0.3894021 Node = 145.42870 (2000.0) a = 4.3182288 AU Inc. = 29.80280 n'= 0.10983623 q = 2.6367012 AU P = 8.973 years The predicted orbit for the 2010 return is as follows: T = 2010 Feb. 19.19853 TT Epoch = 2010 Feb. 13.0 TT Peri. = 43.76457 e = 0.3884966 Node = 145.26586 (2000.0) a = 4.3350981 AU Inc. = 29.73493 n'= 0.10919574 q = 2.6509271 AU P = 9.026 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1992/ 001222 867 0.5+ 0.8- 010414 704 1.1- 1.4+ 920409 675 (1.5+ 3.6+) 001222 867 0.3+ 0.7- 010422 170 (2.9- 1.0+) 920411 675 (0.6+ 3.5+) 001222 867 1.0+ 0.1- 010422 360 0.3+ 0.4+ 920412 413 0.5- 1.0- 001222 867 2.0+ 1.4- 010422 360 0.5+ 0.1+ 920414 372 0.2- 0.7- 2001/ 010430 699 0.2- 0.6- 920414 372 (0.1+ 2.4-) 010127 372 0.8- 0.4+ 010430 699 0.1+ 0.0 920420 372 1.2- 0.9- 010127 372 1.1+ 1.2- 010430 699 0.1- 0.3- 920420 372 (0.4+ 3.3-) 010130 867 0.3+ 0.0 010430 699 0.1- 0.2- 920422 372 1.1- 0.5+ 010130 867 0.1+ 0.3- 010501 170 2.0- 1.6+ 920425 589 1.0- 1.7- 010130 867 0.2- 0.1+ 010508 170 1.2+ 1.0+ 920425 589 (0.7+ 2.6-) 010218 867 0.5- 0.2+ 010508 170 0.8- 0.8+ 920425 589 0.1- 1.6- 010218 867 0.0 0.3- 010510 118 0.9- 0.3+ 920425 589 (0.3+ 2.2-) 010218 867 0.3+ 0.1- 010512 170 1.6- 0.3+ 920425 589 0.5+ 0.8- 010222 867 0.0 0.4+ 010516 704 0.0 1.3+ 920427 261 0.7- 0.6+ 010222 867 0.0 0.6+ 010516 704 0.3+ 1.5+ 920427 261 1.3+ 0.3+ 010222 867 0.5+ 0.5+ 010516 704 0.7+ 0.6+ 920429 801 0.0 0.8- 010226 360 0.1- 0.3+ 010516 704 0.2- 1.2+ 920429 801 0.4+ 0.4- 010226 360 1.1- 0.6+ 010516 360 0.5- 0.8+ 920503 372 1.7- 0.9- 010321 691 0.3- 0.3- 010516 360 0.2- 0.7+ 920503 589 1.0+ 1.1- 010321 691 0.9- 0.2- 010523 682 0.7+ 0.4- 920503 589 1.3- 1.2- 010321 691 1.1- 0.7- 010523 682 0.5+ 0.1+ 920503 589 0.4+ 0.9- 010321 402 0.2- 0.9+ 010523 682 0.1+ 0.1+ 920503 589 1.3+ 0.7- 010321 402 0.4+ 0.9+ 010523 682 1.2+ 0.1- 920503 589 0.7+ 0.4- 010321 402 0.0 0.7+ 010526 699 0.7+ 1.0- 920506 801 0.5+ 0.6+ 010321 360 0.1- 0.8+ 010526 699 1.0+ 1.1- 920506 801 0.8+ 0.6- 010321 360 0.1- 0.8+ 010526 699 0.7+ 0.7- 920510 372 1.2- 0.1- 010321 867 0.4- 0.8+ 010526 699 0.7+ 0.2- 920524 372 (3.1+ 3.3+) 010321 867 0.1- 0.5+ 010526 170 (0.5- 2.7-) 920525 372 (2.6- 1.9-) 010321 867 0.1- 0.7+ 010526 170 0.6+ 1.7- 920526 372 1.1- 0.2- 010325 699 1.0+ 0.2+ 010529 170 0.4+ 0.5- 920601 372 1.6- 1.3- 010325 699 0.1- 0.4+ 010529 170 0.3+ 0.7- 920603 801 (0.3+ 2.5+) 010325 699 1.1+ 0.1- 010608 170 1.7+ 0.2- 920603 801 (0.6+ 2.1+) 010325 699 0.1+ 0.6+ 010617 699 0.4+ 0.2- 920603 372 1.2- 0.8+ 010404 402 0.1+ 0.2+ 010617 699 1.2+ 0.5- 920629 801 1.2+ 0.1- 010404 402 1.3- 0.3+ 010617 699 0.5+ 0.3- 920629 801 1.3+ 0.0 010404 402 0.4- 0.3- 010617 699 1.2+ 0.4- 920702 801 0.9+ 0.2- 010414 170 1.6- 1.9+ 010618 170 0.1- 0.6- 920702 801 1.8+ 0.3- 010414 704 0.2- 0.3+ 010618 170 (0.5+ 2.4-) 2000/ 010414 704 1.0- 0.6+ 010628 170 0.7+ 1.9+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2001 Dec. 22

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