OAA computing section circular NK 922 66P/du Toit
The following improved orbital elements, by S. Nakano, are from 38 observations 1944 to 2003, 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 +/- 1.34 arc seconds. See a prediction on NK 714 (= MPC 40670) with delta-T correction = -0.235 day. Epoch = 2003 Aug. 29.0 TT T = 2003 Aug. 27.98598 +/- 0.00476 (m.e.) TT Peri. = 257.24819 +/- 0.00127 Node = 22.21468 +/- 0.00030 (2000.0) Inc. = 18.70082 +/- 0.00010 q = 1.2742723 +/- 0.0000032 AU e = 0.7876758 +/- 0.0000022 a = 6.0015400 +/- 0.0000107 AU n' = 0.06703630 +/- 0.00000018 P = 14.703 +/- 0.0000393 years A1 = +0.182 +/- 0.098 A2 = -0.01116 +/- 0.00005 T = 1944 June 17.49456 TT Epoch = 1944 May 30.0 TT Peri. = 257.02481 e = 0.7879827 Node = 23.14762 (2000.0) a = 6.0227762 AU Inc. = 18.75005 n'= 0.06668206 q = 1.2769330 AU P = 14.781 years [ T = 1959 Apr. 8.00310 TT Epoch = 1959 Apr. 22.0 TT Peri. = 257.00794 e = 0.7872226 Node = 22.85896 (2000.0) a = 6.0722232 AU Inc. = 18.71732 n'= 0.06586921 q = 1.2920321 AU P = 14.963 years ] T = 1974 Apr. 1.49429 TT Epoch = 1974 Mar. 14.0 TT Peri. = 257.21403 e = 0.7869373 Node = 22.83023 (2000.0) a = 6.0734549 AU Inc. = 18.70841 n'= 0.06584918 q = 1.2940265 AU P = 14.968 years [ T = 1988 Dec. 25.82561 TT Epoch = 1988 Dec. 25.0 TT Peri. = 257.05487 e = 0.7878871 Node = 22.52553 (2000.0) a = 6.0036718 AU Inc. = 18.69943 n'= 0.06700059 q = 1.2734562 AU P = 14.710 years ] The predicted orbit for the 2018 return is as follows: T = 2018 May 19.13522 TT Epoch = 2018 May 2.0 TT Peri. = 257.21143 e = 0.7868913 Node = 21.89526 (2000.0) a = 6.0537650 AU Inc. = 18.67492 n'= 0.06617070 q = 1.2901100 AU P = 14.895 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1944/ 440712 078 1.8- 2.7+ 441019 711 1.1+ 1.0+ 440523 078(14.7- 4.3+) 440714 822 (3.4- 0.7-) 441020 711 0.3+ 0.6+ 440528 078 (5.5- 7.6+) 440714 822 0.1- 0.9- 441020 662 0.4- 2.5+ 440529 822 0.5+ 2.2- 440717 078 1.0+ 0.8+ 441020 662 (0.6- 5.0-) 440529 822 2.6+ 1.5- 440717 078 1.0- 1.5- 441021 711 2.0+ 0.9+ 440530 822 0.6+ 0.5- 440727 078 0.3- 0.7+ 441022 711 1.6+ 1.6- 440530 822 1.4+ 0.9- 440728 822 0.1- 1.8+ 1974/ 440612 822 0.7+ 0.1- 440728 822 (1.6- 16.4+) 740322 805 2.0- 1.2- 440612 822 1.7+ 0.9- 440812 078(57.7+ 2.9+) 740422 805 0.7+ 3.6+ 440614 822 0.8+ 1.2+ 440816 822 0.9- 0.7- 2003/ 440614 822 2.4- 1.3+ 440816 822 0.3- 1.6- 030310 291 0.5+ 0.6+ 440618 822 1.7- 0.0 440819 822 1.1- 2.2- 030310 291 0.7+ 0.8+ 440618 822 1.0- 1.4+ 440819 822 (1.8- 4.6-) 030310 291 0.5+ 0.7+ 440627 822 1.0- 0.5- 440825 078 (5.0+ 2.8-) 030311 291 0.4+ 0.9+ 440627 822 0.2- 1.9- 440919 822 1.4+ 2.1+ 030311 291 0.5+ 0.8+ 440628 822 1.7- 1.9+ 440921 822 (0.7- 4.4+) 030311 291 0.6+ 0.7+ 440628 822 0.2- 0.9- 440926 754 (1.1+ 5.6+) 440712 078 0.9- 2.7- 440926 754 (4.1+ 0.2+) ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2003 Mar. 17