OAA computing section circular NK 1403 P/2005 Y2 (McNaught)

The following improved orbital elements, by S. Nakano, are from 67 observations 2005 Aug. 28 to 2006 Oct. 31. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.66 arc second. See orbits on YC 2500 and YC 2503. Epoch = 2004 Dec. 21.0 TT T = 2004 Dec. 27.96323 +/- 0.00786 (m.e.) TT Peri. = 194.58282 +/- 0.00210 Node = 94.62221 +/- 0.00026 (2000.0) Inc. = 19.17949 +/- 0.00003 q = 3.3550318 +/- 0.0000519 AU e = 0.4662949 +/- 0.0000103 a = 6.2863023 +/- 0.0000247 AU n' = 0.06253328 +/- 0.00000037 P = 15.761 +/- 0.0000928 years The predicted orbit for the 2020 return is as follows: T = 2020 Oct. 21.97763 TT Epoch = 2020 Nov. 7.0 TT Peri. = 194.06100 e = 0.4702950 Node = 94.51331 (2000.0) a = 6.3829076 AU Inc. = 19.09684 n'= 0.06111900 q = 3.3810584 AU P = 16.126 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2005/ 051231 734 0.6+ 1.1- 060102 E12 0.8+ 0.9- 050828 E12 0.2+ 0.4+ 051231 711 0.3- 0.0 060102 E12 0.7- 0.3- 050828 E12 0.2- 1.4+ 051231 E12 0.5+ 0.3+ 060102 J76 0.6+ 0.5+ 050828 E12 0.6+ 0.0 051231 E12 0.1+ 0.7- 060102 J76 0.1+ 0.2+ 050828 E12 0.4+ 0.0 051231 E12 0.3+ 0.7+ 060102 J76 0.3+ 0.6+ 050930 E12 0.0 0.4- 051231 E12 0.7- 0.2+ 060107 673 0.5+ 0.5+ 050930 E12 0.3- 1.6- 051231 E12 0.1+ 0.3- 060107 673 0.2+ 0.3+ 050930 E12 0.4+ 0.2+ 051231 E12 0.9- 1.0+ 060107 673 0.2- 0.2+ 050930 E12 0.2- 1.1- 051231 E12 0.3+ 1.2- 060107 673 0.6- 0.4+ 051114 644 0.0 0.4+ 051231 E12 0.4+ 0.4- 060901 215 1.4+ 1.2+ 051114 644 0.6- 0.3+ 2006/ 060924 699 0.0 0.4- 051114 644 0.8- 0.0 060101 711 1.9- 0.5- 060924 699 1.3- 0.4+ 051230 E12 0.0 0.3- 060101 711 (2.1- 2.4-) 060924 699 1.2- 0.7- 051230 E12 0.1- 1.0- 060101 E12 1.4+ 0.1- 060924 699 1.5- 0.7- 051230 E12 0.9+ 0.5- 060101 E12 0.4+ 0.2+ 060925 703 0.9+ 1.0- 051230 E12 0.4+ 0.1- 060101 E12 0.8- 0.6- 060925 703 0.2- 0.9- 051230 E12 0.4+ 0.4+ 060101 E12 0.5- 0.2+ 060925 703 0.9- 1.0- 051230 E12 0.3- 0.2+ 060101 J76 0.1+ 0.1+ 061016 215 0.5+ 0.4- 051230 E12 0.0 0.4+ 060101 J76 0.0 0.8+ 061031 703 1.5+ 1.1+ 051231 711 0.1- 0.3+ 060101 J76 0.1+ 0.8+ 061031 703 0.9+ 0.4+ 051231 734 0.1+ 0.9- 060102 415 0.1+ 0.5+ 061031 703 0.9+ 0.7+ 051231 734 0.1+ 0.1- 060102 415 0.5+ 0.8+ 061031 703 0.6- 1.1+ 051231 734 0.7- 0.4- 060102 E12 0.9- 0.5- 051231 711 0.2- 0.1+ 060102 E12 0.3- 1.0+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2006 Dec. 5

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