OAA computing section circular NK 588 Periodic Comet Pons-Winnecke (7P)
The following improved orbital elements, by S. Nakano, are from 37 observations 1964 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 +/- 0.97 arc second. See same orbit on MPC 22030. Epoch = 1989 Aug. 22.0 TT T = 1989 Aug. 19.89667 +/- 0.00084 (m.e.) TT Peri. = 172.33750 +/- 0.00036 Node = 93.43193 +/- 0.00020 (2000.0) Inc. = 22.27218 +/- 0.00004 q = 1.2609642 +/- 0.0000007 AU e = 0.6335113 +/- 0.0000003 a = 3.4406632 +/- 0.0000003 AU n' = 0.15443326 +/- 0.00000002 P = 6.382 +/- 0.0000008 years A1 = +0.049 +/- 0.016 A2 = +0.00254 +/- 0.00011 T = 1964 Mar. 24.55021 TT Epoch = 1964 Mar. 26.0 TT Peri. = 172.04621 e = 0.6393852 Node = 93.56116 (2000.0) a = 3.4111939 AU Inc. = 22.32507 n'= 0.15643879 q = 1.2301271 AU P = 6.300 years T = 1970 July 21.03107 TT Epoch = 1970 Aug. 2.0 TT Peri. = 172.26228 e = 0.6360033 Node = 93.46836 (2000.0) a = 3.4268516 AU Inc. = 22.32172 n'= 0.15536784 q = 1.2473627 AU P = 6.344 years T = 1976 Nov. 28.74278 TT Epoch = 1976 Dec. 8.0 TT Peri. = 172.37793 e = 0.6347038 Node = 93.42723 (2000.0) a = 3.4333976 AU Inc. = 22.29325 n'= 0.15492372 q = 1.2542072 AU P = 6.362 years T = 1983 Apr. 7.50696 TT Epoch = 1983 Apr. 16.0 TT Peri. = 172.33576 e = 0.6347141 Node = 93.43107 (2000.0) a = 3.4328980 AU Inc. = 22.30711 n'= 0.15495755 q = 1.2539894 AU P = 6.361 years The predicted orbit for the 1996 return is as follows: T = 1996 Jan. 2.45304 TT Epoch = 1995 Dec. 29.0 TT Peri. = 172.31269 e = 0.6344237 Node = 93.42808 (2000.0) a = 3.4353753 AU Inc. = 22.30145 n'= 0.15478996 q = 1.2558917 AU P = 6.367 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 640219 689 0.3+ 0.5- 700508 691 1.6+ 0.5- 830522 474 0.5+ 1.5- 640314 689 0.3- 0.4+ 700508 691 1.5+ 1.0- 830522 474 1.4- 0.4- 640315 689 0.7- 0.1+ 700607 693 (3.0+ 1.0-) 830905 707 0.1- 2.6+ 640321 689 0.4- 1.1- 700607 693 (3.3+ 1.3-) 831006 413 (4.9- 6.3+) 640411 689 1.1+ 1.4+ 700706 693 (2.8+ 0.2+) 831006 413 (1.7+ 4.6+) 640412 689 1.3- 1.9+ 700822 323 0.9+ 0.4+ 890117 675 0.3+ 0.2+ 640716 689 0.5- 1.1+ 700822 323 (3.1- 3.0+) 890117 675 0.1+ 0.2+ 640806 689 1.1- 1.3- 701101 693 0.4- 1.7+ 890117 675 0.2+ 0.1+ 640815 689 1.1+ 0.9- 701101 693 0.8- 1.1+ 890117 675 0.1+ 0.0 640904 689 0.5- 1.7+ 760325 691 0.7- 0.0 890118 675 0.3+ 0.4+ 640904 689 0.2+ 0.8+ 760325 691 0.4- 0.0 890118 675 0.0 0.6+ 641008 689 1.3+ 0.4+ 830112 707 (5.2- 2.6-) 890118 675 0.5+ 0.5+ 641008 689 0.1- 0.0 830114 372 (6.8- 3.9+) 890118 675 0.1- 0.7+ 700203 691(19.6+ 48.8+)X 830119 707 0.1- 2.0- 891003 675 (0.1+ 6.0-) 700307 691 1.4+ 2.1+ 830120 372 1.1- 1.0+ 891003 675 (1.5- 6.1-) 700313 691 1.2- 1.5+ 830120 372 (5.1- 0.1+) 700313 691 1.0- 1.1+ 830416 474 0.6- 1.1- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1993 Apr. 7