OAA computing section circular NK 695 7P/Pons-Winnecke

The following improved orbital elements, by S. Nakano, are from 55 observations 1964-1996, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. But there seems to be almost no non-gravitational effect for the comet. The mean residual is +/- 1.03 arc seconds. Epoch = 1995 Dec. 29.0 TT T = 1996 Jan. 2.45532 +/- 0.00111 (m.e.) TT Peri. = 172.31429 +/- 0.00026 Node = 93.42732 +/- 0.00016 (2000.0) Inc. = 22.30140 +/- 0.00004 q = 1.2558907 +/- 0.0000007 AU e = 0.6344250 +/- 0.0000002 a = 3.4353846 +/- 0.0000008 AU n' = 0.15478933 +/- 0.00000005 P = 6.367 +/- 0.0000022 years A1 = +0.006 +/- 0.009 A2 = +0.00258 +/- 0.00011 T = 1964 Mar. 24.54979 TT Epoch = 1964 Mar. 26.0 TT Peri. = 172.04670 e = 0.6393865 Node = 93.56039 (2000.0) a = 3.4112033 AU Inc. = 22.32502 n'= 0.15643815 q = 1.2301260 AU P = 6.300 years T = 1970 July 21.03106 TT Epoch = 1970 Aug. 2.0 TT Peri. = 172.26301 e = 0.6360046 Node = 93.46760 (2000.0) a = 3.4268605 AU Inc. = 22.32167 n'= 0.15536724 q = 1.2473615 AU P = 6.344 years T = 1976 Nov. 28.74320 TT Epoch = 1976 Dec. 8.0 TT Peri. = 172.37888 e = 0.6347051 Node = 93.42647 (2000.0) a = 3.4334066 AU Inc. = 22.29320 n'= 0.15492311 q = 1.2542060 AU P = 6.362 years T = 1983 Apr. 7.50791 TT Epoch = 1983 Apr. 16.0 TT Peri. = 172.33693 e = 0.6347154 Node = 93.43031 (2000.0) a = 3.4329071 AU Inc. = 22.30706 n'= 0.15495693 q = 1.2539883 AU P = 6.361 years T = 1989 Aug. 19.89826 TT Epoch = 1989 Aug. 22.0 TT Peri. = 172.33888 e = 0.6335126 Node = 93.43117 (2000.0) a = 3.4406724 AU Inc. = 22.27213 n'= 0.15443264 q = 1.2609631 AU P = 6.382 years The predicted orbit for the 2002 return is as follows: T = 2002 May 15.72598 TT Epoch = 2002 May 6.0 TT Peri. = 172.29328 e = 0.6340775 Node = 93.44963 (2000.0) a = 3.4382923 AU Inc. = 22.28477 n'= 0.15459302 q = 1.2581484 AU P = 6.375 years The following residuals in seconds of arc are from the above orbital elements: 1964/ 701101 693 0.8- 2.1+ 891003 675 (2.3+ 6.4-) 640219 689 0.2+ 0.3+ 701101 693 1.1- 1.4+ 891003 675 (0.7+ 6.4-) 640314 689 0.6- 1.4+ 1976/ 1994/ 640315 689 1.1- 1.0+ 760325 691 1.0- 0.4- 941231 693 0.2+ 0.5+ 640321 689 0.8- 0.2- 760325 691 0.7- 0.5- 941231 693 0.3+ 0.5+ 640411 689 0.6+ 2.3+ 1983/ 941231 691 0.2+ 0.1- 640412 689 (1.9- 2.8+) 830112 707 (4.3- 2.6-) 941231 693 0.0 1.0+ 640716 689 0.6- 1.3+ 830114 372 (5.2- 3.9+)Y 941231 691 0.2+ 0.6+ 640806 689 1.0- 1.3- 830119 707 0.8+ 2.0- 941231 691 0.5+ 0.2+ 640815 689 1.2+ 1.0- 830120 372 0.2- 1.1+ 941231 691 0.4+ 0.7+ 640904 689 0.2- 1.5+ 830120 372 (3.8- 0.5+)Y 1995/ 640904 689 0.4+ 0.6+ 830416 474 0.1+ 0.4- 950107 691 1.5+ 0.1+ 641008 689 1.7+ 0.0 830522 474 0.2+ 0.9- 950107 691 0.9+ 0.6+ 641008 689 0.2+ 0.5- 830522 474 1.7- 0.2+ 950107 691 1.0+ 1.3+ 1970/ 830905 707 1.6- 1.8+ 950128 691 1.3- 0.5+ 700203 691(20.0+ 48.4+)X 831006 413 (6.4- 5.4+) 950128 691 1.1- 0.8+ 700307 691 1.9+ 1.9+ 831006 413 (0.2+ 3.7+) 950128 691 1.3- 0.7+ 700313 691 0.6- 1.3+ 1989/ 1996/ 700313 691 0.5- 0.9+ 890117 675 0.4- 0.2+ 960726 360 1.7- 2.1+ 700508 691 2.6+ 0.2+ 890117 675 0.6- 0.2+ 960726 360 0.3- 1.5+ 700508 691 2.5+ 0.3- 890117 675 0.5- 0.1+ 960726 360 (2.1- 3.4+) 700607 693 (4.1+ 0.3+) 890117 675 0.6- 0.0 960921 691 0.5- 1.7+ 700607 693 (4.4+ 0.0 ) 890118 675 0.4- 0.4+ 960921 691 0.6- 1.7+ 700706 693 (4.0+ 1.8+) 890118 675 0.7- 0.6+ 961119 691 1.0+ 0.9+ 700822 323 1.6+ 1.8+ 890118 675 0.1- 0.5+ 961119 691 0.9+ 1.1+ 700822 323 (2.3- 4.4+) 890118 675 0.7- 0.7+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1999 Oct. 31

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