OAA computing section circular NK 1268 120P/Mueller 1

The following improved orbital elements, by T. Kobayashi, are from 84 observations 1987 to 2004. Perturbations by Mercury to Pluto were taken into account. The mean residual is +/- 0.67 arc second. See an orbit in NK 790 (= HICQ 2005). Epoch = 2004 Oct. 2.0 TT T = 2004 Sept.30.11625 +/- 0.00059 (m.e.) TT Peri. = 30.16964 +/- 0.00019 Node = 4.46049 +/- 0.00014 (2000.0) Inc. = 8.78706 +/- 0.00003 q = 2.7468175 +/- 0.0000010 AU e = 0.3367624 +/- 0.0000002 a = 4.1415285 +/- 0.0000021 AU n' = 0.11694000 +/- 0.00000009 P = 8.428 +/- 0.0000063 years T = 1987 Dec. 4.08692 TT Epoch = 1987 Nov. 21.0 TT Peri. = 30.28234 e = 0.3376436 Node = 4.64482 (2000.0) a = 4.1467229 AU Inc. = 8.80041 n'= 0.11672034 q = 2.7466085 AU P = 8.444 years T = 1996 Apr. 24.63682 TT Epoch = 1996 Apr. 27.0 TT Peri. = 29.91366 e = 0.3373741 Node = 4.56240 (2000.0) a = 4.1343010 AU Inc. = 8.79605 n'= 0.11724678 q = 2.7394950 AU P = 8.406 years The predicted orbit for the 2013 return is as follows: T = 2013 Feb. 22.43264 TT Epoch = 2013 Mar. 9.0 TT Peri. = 30.11221 e = 0.3389872 Node = 4.44992 (2000.0) a = 4.1285790 AU Inc. = 8.79674 n'= 0.11749062 q = 2.7290434 AU P = 8.389 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1987/ 880213 691 1.0- 0.7+ 961214 691 0.9+ 0.9+ 871018 675 0.3+ 0.5+ 1995/ 2003/ 871019 675 1.1- 0.2- 950730 691 0.4- 1.5+ 031119 568 1.3+ 0.6- 871020 675 1.1- 1.3+ 950730 691 (0.8- 2.0+) 031119 568 1.2+ 0.4- 871021 675 (2.5- 0.5+) 950730 691 0.2+ 1.5+ 2004/ 871021 372 (0.0 3.2-)Y 950801 691 1.3- 1.3+ 040915 291 0.2- 0.0 871021 372 (1.5+ 2.2-)Y 950801 691 1.2- 0.6+ 040915 291 1.0- 0.2- 871022 801 (3.1+ 7.4+) 950801 691 (1.4- 2.2+) 040915 291 0.5- 0.1- 871023 801 (2.9- 1.6+) 950828 950(48.2+ 8.1+) 040916 291 0.6- 0.5+ 871024 801 (0.4+ 2.1+) 950828 950(47.2+ 6.0+) 040916 291 1.0- 0.2- 871026 691 0.2- 0.3- 950830 693 0.0 1.4- 040916 291 0.6+ 0.3+ 871026 691 0.6+ 0.1- 950830 693 1.1- 1.2- 040918 461 0.5+ 0.2+ 871026 691 0.3+ 0.2- 950902 691 0.3- 0.3+ 040918 461 0.0 0.0 871027 691 0.4+ 0.1- 950902 691 0.2- 0.1- 040918 461 0.4- 0.2+ 871027 691 0.4+ 0.1- 950902 691 0.8- 0.1+ 040918 461 0.1- 0.3- 871027 372 0.6+ 0.7- Y 951022 691 0.1+ 0.0 041021 360 0.5- 0.6- 871028 675 0.0 1.9- Y 951022 691 1.4+ 0.5+ 041021 360 0.5- 0.6- 871028 675 (1.2+ 3.9-)Y 951028 693 0.5+ 0.4+ 041021 360 0.2- 0.3+ 871116 691 0.1+ 0.6- 951028 693 0.1+ 0.8+ 041022 213 0.1+ 0.3- 871116 691 0.6- 0.2- 951028 693 0.8- 0.5+ 041022 213 0.2+ 0.3- 871124 691 0.5+ 0.1+ 951116 691 (2.2- 0.9-) 041102 213 0.2+ 0.6+ 871124 691 0.3+ 0.5- 951116 691 0.0 0.5- 041102 213 0.3+ 0.5+ 871221 691 1.3+ 0.3+ 951116 691 0.1- 0.3- 041102 213 0.0 0.6+ 871221 691 0.5- 1.1- 1996/ 041106 360 0.0 0.1- 871221 691 0.4- 0.8- 960121 691 0.1- 0.0 041106 360 0.0 0.1+ 871223 691 0.9+ 0.5+ 960121 691 0.4- 0.1- 041106 360 0.0 0.4+ 871223 691 1.1+ 0.2+ 961113 867 0.7- 0.6+ 041116 850 0.2+ 0.1+ 1988/ 961113 867 1.6- 0.6+ 041116 850 0.5- 0.4- 880115 691 0.3+ 0.8- 961118 691 0.4+ 0.0 041120 A32 1.8+ 0.8- 880115 691 0.2- 0.6- 961118 691 0.6- 0.3+ 041121 A32 (2.7+ 0.6-) 880212 691 0.9+ 1.1- 961118 691 0.1- 0.3+ 041208 360 0.2+ 1.2+ 880212 691 1.8+ 0.4+ 961203 867 0.6+ 0.3+ 041208 360 0.6+ 0.4+ 880212 691 0.8+ 0.3- 961203 867 0.5- 0.4+ 041208 360 0.4+ 0.1- 880213 691 0.8+ 0.7+ 961214 691 0.4+ 0.8+ 880213 691 0.1- 0.1- 961214 691 0.3+ 0.8+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2005 Oct. 26

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