OAA computing section circular NK 1579 79P/du Toit-Hartley

The following improved orbital elements, by S. Nakano, are from 117 observations 1986 to 2008, 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 +/- 0.61 arc second. See orbits in NK 706 and NK 920 (= HICQ 2007, YC 2387). The delta-T correction = -0.018 day for the prediction in NK 820) Epoch = 2008 May 14.0 TT T = 2008 May 28.42847 +/- 0.00132 (m.e.) TT Peri. = 253.27683 +/- 0.00047 Node = 307.83781 +/- 0.00027 (2000.0) Inc. = 2.89335 +/- 0.00004 q = 1.2305166 +/- 0.0000041 AU e = 0.5939953 +/- 0.0000011 a = 3.0307942 +/- 0.0000043 AU n' = 0.18679678 +/- 0.00000040 P = 5.276 +/- 0.0000113 years A1 = +0.307 +/- 0.019 A2 = +0.00779 +/- 0.00059 T = 1987 June 14.01215 TT Epoch = 1987 June 14.0 TT Peri. = 251.56165 e = 0.6012170 Node = 309.34458 (2000.0) a = 3.0069108 AU Inc. = 2.94280 n'= 0.18902675 q = 1.1991048 AU P = 5.214 years [ T = 1992 Aug. 27.62809 TT Epoch = 1992 Sept.15.0 TT Peri. = 251.47493 e = 0.6016072 Node = 309.35064 (2000.0) a = 3.0050837 AU Inc. = 2.94305 n'= 0.18919917 q = 1.1972037 AU P = 5.209 years ] [ T = 1997 Nov. 14.55043 TT Epoch = 1997 Nov. 8.0 TT Peri. = 251.61881 e = 0.6007623 Node = 309.23637 (2000.0) a = 3.0075512 AU Inc. = 2.93978 n'= 0.18896638 q = 1.2007279 AU P = 5.216 years ] T = 2003 Feb. 15.37044 TT Epoch = 2003 Feb. 10.0 TT Peri. = 253.07277 e = 0.5940953 Node = 307.96898 (2000.0) a = 3.0302982 AU Inc. = 2.89479 n'= 0.18684265 q = 1.2300124 AU P = 5.275 years The predicted orbit for the 2013 return is as follows: T = 2013 Aug. 23.31304 TT Epoch = 2013 Aug. 16.0 TT Peri. = 281.69985 e = 0.6184891 Node = 280.62748 (2000.0) a = 2.9457358 AU Inc. = 3.14590 n'= 0.19494558 q = 1.1238302 AU P = 5.056 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1986/ 071118 G96 0.0 0.2+ 080104 A50 0.5- 0.6+ 861227 691 0.3+ 0.1+ 071118 G96 0.1+ 0.5+ 080104 A50 0.5- 0.8+ 861227 691 0.1+ 0.4+ 071118 G96 0.2+ 0.3+ 080105 A50 0.8- 0.4+ 861227 691 0.6+ 0.4+ 071215 673 1.1+ 0.1+ 080109 J47 0.5- 0.2+ 861228 691 0.3+ 0.5- 071215 673 0.7+ 0.1+ 080110 J47 0.6+ 0.1+ 861228 691 0.2+ 0.6+ 071215 673 0.7+ 0.1+ 080110 J47 0.3+ 0.0 861228 691 0.1- 1.1+ 071215 673 1.0+ 0.0 080110 215 0.3+ 0.4- 1987/ 071216 673 0.6+ 0.3- 080110 215 0.3+ 0.3- 870103 691 0.7+ 0.3- 071216 673 0.8+ 0.1- 080110 215 0.2+ 0.3- 870103 691 0.1+ 0.2- 071216 673 0.9+ 0.0 080110 J51 0.2+ 0.1+ 870103 691 0.5+ 0.2+ 071216 673 0.9+ 0.2+ 080110 J51 0.4+ 0.4+ 870103 691 0.6+ 0.1- 071218 699 0.7+ 0.5- 080110 J51 0.9+ 0.5+ 870103 691 0.6+ 0.2- 071218 699 0.8- 0.3- 080111 691 0.5- 0.1- 870125 691 1.1- 0.7- 071218 699 0.9- 0.1+ 080111 691 0.8- 0.3- 870125 691 1.1- 0.7- 071218 699 1.1- 0.2- 080111 691 1.2- 0.2+ 870125 691 0.8- 0.4- 071221 204 0.4+ 0.1- 080111 691 1.1- 0.0 870327 691 0.4+ 0.8+ 071221 204 0.0 0.3- 080111 691 0.8- 0.2+ 870327 691 0.2- 1.1+ 071228 691 0.6- 0.0 080111 691 0.9- 0.3+ 870327 691 0.2- 0.5+ 071228 691 1.6- 0.7- 080112 213 0.6+ 0.1- 870328 691 0.0 0.4+ 071228 691 0.4- 0.1+ 080112 213 0.1+ 0.2+ 870328 691 1.4- 0.3+ 071230 703 0.4- 0.1+ 080112 213 0.1+ 0.0 870328 691 1.3- 0.0 071230 703 1.4- 0.6- 080115 699 0.0 0.5- 870501 691 0.9+ 1.0+ 071230 703 0.4- 0.5+ 080115 699 0.7- 0.3+ 870501 691 1.3+ 0.4+ 071230 703 0.9- 0.3- 080115 699 0.3- 0.4- 870501 691 0.1+ 0.8+ 071230 349 0.4+ 0.0 080115 699 1.5- 0.1+ 870525 691 0.2- 0.1- 071230 349 0.4+ 0.0 080126 130 0.3+ 0.1- 870525 691 0.4+ 0.5+ 071230 349 0.3+ 0.2- 080126 130 0.4+ 0.5- 870525 691 0.1- 0.1+ 071231 704 0.3+ 1.0+ 080126 130 0.1- 0.2- 2003/ 071231 704 1.4+ 0.8+ 080126 170 0.9+ 0.9- 030304 844 (2.0+ 0.3-) 071231 704 (0.1+ 2.0+) 080126 170 0.0 0.3- 030304 844 (2.5- 0.7+) 2008/ 080126 170 0.1+ 0.6- 030304 844 0.2+ 0.2+ 080101 699 0.4- 0.1+ 080127 B49 0.8+ 0.5- 030304 844 0.5- 0.1- 080101 699 0.6- 0.0 080127 B49 0.1+ 0.5- 030304 844 1.5+ 0.1- 080101 691 0.0 1.6+ 080127 B49 0.3+ 0.1- 030305 844 0.1- 0.2- 080101 699 (2.0- 0.8+) 080128 204 0.5+ 0.2- 030305 844 0.7+ 0.6- 080101 691 0.2+ 0.2- 080129 704 0.9+ 0.2- 030305 844 0.4- 0.2+ 080101 699 1.7- 0.5+ 080129 704 1.4+ 0.6- 030305 844 0.6- 0.4- 080101 691 0.0 0.2+ 080129 704 0.4+ 0.9- 030305 844 1.8- 0.3- 080102 B42 0.8- 0.2- 080129 704 0.8+ 1.1- 030305 844 1.2+ 0.1- 080102 B42 1.2+ 0.4- 080129 704 0.3+ 0.2- 2007/ 080102 B42 0.4+ 0.0 080207 204 0.1+ 0.6- 071118 G96 0.1- 0.0 080104 A50 1.4- 1.2+ 080207 204 0.1+ 0.3+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2008 Feb. 15

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