OAA computing section circular NK 589 Periodic Comet du Toit-Neujmin-Delporte (57P)

The following improved orbital elements, by S. Nakano, are from 22 observations 1970 to 1989, including planetary perturbations by Mercury to Pluto and five minor planets, Ceres, Pallas, Vesta, Iris, Bamberga and non-gravitational effect of style II. The mean residual is +/- 0.70 arc second. See same orbit on Comet Catalog 1996 and MPC 22030. Epoch = 1989 Oct. 1.0 TT T = 1989 Oct. 18.42689 +/- 0.01277 (m.e.) TT Peri. = 115.29782 +/- 0.00389 Node = 189.05501 +/- 0.00087 (2000.0) Inc. = 2.84612 +/- 0.00005 q = 1.7153303 +/- 0.0000214 AU e = 0.5016772 +/- 0.0000014 a = 3.4422074 +/- 0.0000107 AU n' = 0.15432935 +/- 0.00000072 P = 6.386 +/- 0.0000297 years A1 = +1.821 +/- 0.408 A2 = -0.01145 +/- 0.00730 T = 1970 Oct. 7.22329 TT Epoch = 1970 Oct. 21.0 TT Peri. = 114.22822 e = 0.5097480 Node = 189.97511 (2000.0) a = 3.4107055 AU Inc. = 2.84215 n'= 0.15647240 q = 1.6721050 AU P = 6.299 years [ T = 1977 Jan. 28.17604 TT Epoch = 1977 Jan. 17.0 TT Peri. = 114.44146 e = 0.5095696 Node = 189.84797 (2000.0) a = 3.4123417 AU Inc. = 2.84415 n'= 0.15635987 q = 1.6735160 AU P = 6.303 years ] T = 1983 June 1.31819 TT Epoch = 1983 May 26.0 TT Peri. = 115.15880 e = 0.5028538 Node = 189.14998 (2000.0) a = 3.4358737 AU Inc. = 2.84613 n'= 0.15475628 q = 1.7081317 AU P = 6.369 years The predicted orbit for the 1996 return is as follows: T = 1996 Mar. 5.61071 TT Epoch = 1996 Mar. 18.0 TT Peri. = 115.19196 e = 0.5007697 Node = 188.99017 (2000.0) a = 3.4445588 AU Inc. = 2.84531 n'= 0.15417135 q = 1.7196280 AU P = 6.393 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 700727 691 0.0 0.2- 830520 675 0.2- 0.6+ 831008 801 (1.1- 3.6+) 700727 691 0.6+ 0.8- 830521 675 0.4+ 0.8- 890522 675 0.3+ 0.1+ 700731 821 (3.3+ 1.2-) 830609 707 (4.4- 0.2+) 890522 675 0.4- 0.2+ 700801 821 (4.2+ 3.0-) 830710 707 (5.4- 1.1-) 890522 675 0.5+ 0.2- 700801 821 0.5+ 1.3- 830904 801 1.5- 1.3+ 890523 675 0.2+ 0.3- 700801 821 1.5- 0.1+ 830904 688 0.9- 0.6- 890523 675 0.3- 0.1+ 700805 821 0.3+ 0.4+ 830904 688 (5.8- 1.8+) 890523 675 0.2+ 0.4+ 700805 821 0.4- 0.5+ 830913 707 1.7+ 0.1- 890526 372 0.4- 0.5+ 701005 691 0.6+ 0.1+ 830914 688 1.6+ 0.3+ 701005 691 0.3- 0.6+ 830914 688 1.0- 0.7- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1993 Apr. 7

Back to Nakano Note Page