OAA computing section circular NK 595 Periodic Comet Gunn (65P)
The following improved orbital elements, by S. Nakano, are from 100 observations 1980 to 1993, 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 +/- 1.03 arc seconds. See same orbit on Comet Catalog 1993 and MPC 22032. Epoch = 1989 Oct. 1.0 TT T = 1989 Sept.24.97033 +/- 0.00071 (m.e.) TT Peri. = 196.97485 +/- 0.00023 Node = 68.53097 +/- 0.00015 (2000.0) Inc. = 10.37463 +/- 0.00004 q = 2.4715559 +/- 0.0000018 AU e = 0.3143919 +/- 0.0000007 a = 3.6049104 +/- 0.0000013 AU n' = 0.14399995 +/- 0.00000008 P = 6.844 +/- 0.0000036 years A1 = +1.508 +/- 0.155 A2 = +0.35597 +/- 0.05650 T = 1982 Nov. 26.88769 TT Epoch = 1982 Nov. 7.0 TT Peri. = 197.01715 e = 0.3163672 Node = 68.54893 (2000.0) a = 3.5971804 AU Inc. = 10.38528 n'= 0.14446437 q = 2.4591506 AU P = 6.822 years The predicted orbit for the 1996 return is as follows: T = 1996 July 24.40090 TT Epoch = 1996 July 16.0 TT Peri. = 196.81730 e = 0.3163130 Node = 68.51903 (2000.0) a = 3.6009560 AU Inc. = 10.37993 n'= 0.14423723 q = 2.4619268 AU P = 6.833 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 801207 801 1.7- 0.1+ 880115 691 0.7- 0.0 890524 046 (3.6+ 0.0 ) 810106 801 0.1+ 0.1- 880115 691 0.7- 0.1- 890524 046 1.1+ 1.1- 810126 675 0.2- 2.0- 880214 691 0.2+ 0.5+ 890525 400 2.1+ 2.1+ 810204 801 0.9+ 0.4+ 880214 691 0.8+ 0.9+ 890525 400 1.8+ 1.2+ 811230 809 2.2- 2.4+ 880214 691 0.8+ 0.6+ 890525 046 0.5+ 0.4+ 811231 809 0.3- 0.4- 880214 691 0.7+ 0.7+ 890525 046 0.3+ 0.1- 820201 805 0.5- 0.4+ 880519 568 (3.6+ 2.6+) 890526 400 2.4+ 1.1+ 820201 805 0.2- 0.3+ 890105 897 (3.6- 6.3+) 890526 046 0.1+ 1.1+ 820227 801 1.6- 1.3+ 890105 897 (0.4- 3.5+) 890526 046 0.6+ 0.3+ 820326 707 1.8- 1.6- 890213 897 (5.3- 4.2+) 890527 373 1.4- 2.7+ 820420 801 0.1- 0.1+ 890213 897 (6.1- 4.6+) 890528 046 1.6+ 0.9+ 820516 675 0.0 1.1+ 890310 373 2.1- 0.8+ 890528 046 0.2- 0.0 820523 372 1.0+ 0.1- 890310 373 (3.6- 1.1+) 890530 403 (3.0+ 2.3+) 820526 801 0.1- 1.0+ 890312 808 0.3- 0.6+ 890530 403 (1.3+ 3.1+) 820527 707 0.4- 1.6- 890312 808 0.3- 0.7+ 890530 373 (0.2+ 4.5+) 820621 801 2.0+ 0.8- 890405 807 0.2- 0.9+ 890601 400 2.4+ 1.4- 820719 801 1.9+ 0.2- 890405 807 0.3+ 0.8+ 890601 400 2.5+ 0.7- 830622 707 2.0+ 1.1+ 890405 373 (4.8- 3.8+) 890601 376 (3.4+ 1.7-) 830712 474 1.1- 0.8+ 890412 403 (2.0+ 3.6+) 890601 376 (1.9+ 2.9-) 830712 474 0.0 1.0+ 890428 657 1.4- 0.0 890601 376 (1.3+ 4.1-) 830928 707 0.0 0.5+ 890428 657 (3.6- 0.4-) 890602 392 (4.1+ 3.6+) 840824 801 0.9- 0.1- 890430 657 2.1- 0.9+ 890602 392 (3.5+ 3.5+) 840827 801 0.6- 0.8+ 890502 373 2.5- 1.7+ 890602 392 (3.9+ 2.3+) 840828 801 0.8- 0.1+ 890504 657 0.2+ 0.9+ 890623 400 (2.0- 8.3-) 840923 801 1.3+ 0.5+ 890504 657 0.2- 0.2- 890623 400 (3.1- 7.8-) 841021 801 1.2+ 0.4+ 890505 399 0.0 0.6+ 890626 413 0.0 0.4+ 841224 801 0.7- 0.5+ 890505 399 0.1- 1.3+ 890704 808 0.5+ 1.5- 850921 691 0.2- 0.2- 890505 399 0.3- 0.8+ 890705 808 1.1+ 1.6- 851019 691 1.2- 0.5- 890505 046 1.2+ 1.9- 890803 568 0.6- 0.9+ 851019 691 1.5- 0.5+ 890505 046 0.9- 0.1- 890803 568 1.4- 0.1- 851019 691 0.6- 0.4+ 890507 657 0.1- 0.2+ 900917 675 (1.1- 3.1-) 861202 691 1.5+ 0.5- 890507 046 1.4- 2.1- 900917 675 (1.9- 4.0-) 861202 691 1.0+ 0.2- 890507 046 1.4- 1.2- 900919 675 (1.8- 3.4-) 861202 691 1.7+ 0.3- 890509 046 0.4- 1.8- 900919 675 (2.2- 3.7-) 861229 691 0.0 0.6+ 890509 046 0.3- 0.4- 900924 413 0.1- 1.8- 861229 691 0.0 0.3+ 890509 046 0.3+ 0.4- 910917 691 1.4- 0.0 861229 691 0.2+ 0.3+ 890509 046 0.0 0.4- 910917 691 1.4- 0.2- 870104 691 0.1+ 0.2- 890515 897 0.5+ 1.4+ 910917 691 1.8- 0.6+ 870104 691 0.2+ 0.2- 890522 046 0.5- 1.7- 930124 691 0.7+ 1.5+ 870104 691 0.5+ 0.4- 890522 046 0.0 0.3+ 930124 691 0.4+ 1.1+ 870104 691 0.3+ 0.6- 890523 046 0.4+ 0.9- 930125 691 0.2+ 1.1+ 880115 691 0.4- 0.1- 890523 046 0.1- 1.6- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 1993 Apr. 13