OAA computing section circular NK 713 100P/Hartley 1

The following improved orbital elements, by S. Nakano, are from 115 observations 1985-1997. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.79 arc second. Epoch = 1997 June 1.0 TT T = 1997 May 28.51689 +/- 0.00018 (m.e.) TT Peri. = 178.93281 +/- 0.00008 Node = 38.90303 +/- 0.00004 (2000.0) Inc. = 25.72326 +/- 0.00004 q = 1.8186814 +/- 0.0000007 AU e = 0.4506095 +/- 0.0000002 a = 3.3103620 +/- 0.0000005 AU n' = 0.16364052 +/- 0.00000004 P = 6.023 +/- 0.0000014 years T = 1985 June 11.65076 TT Epoch = 1985 June 24.0 TT Peri. = 174.14359 e = 0.5120788 Node = 41.06304 (2000.0) a = 3.1558156 AU Inc. = 24.93225 n'= 0.17580719 q = 1.5397894 AU P = 5.606 years T = 1991 May 17.67653 TT Epoch = 1991 May 24.0 TT Peri. = 178.75670 e = 0.4506932 Node = 38.94894 (2000.0) a = 3.3103005 AU Inc. = 25.72465 n'= 0.16364508 q = 1.8183707 AU P = 6.023 years The predicted orbit for the 2003 return is as follows: T = 2003 Aug. 18.03463 TT Epoch = 2003 Aug. 29.0 TT Peri. = 181.53397 e = 0.4191391 Node = 37.89198 (2000.0) a = 3.4082822 AU Inc. = 25.66368 n'= 0.15663931 q = 1.9797380 AU P = 6.292 years The following residuals in seconds of arc are from the above orbital elements: 1985/ 910515 675 0.8+ 0.5+ 970409 118 0.3+ 1.1+ 850613 413 (5.2- 6.2+) 910517 675 0.8+ 0.1- 970409 118 0.5+ 0.7+ 850613 413 (3.7+ 4.1-) 910517 675 1.7+ 1.4+ 970411 867 0.3- 0.0 850613 413 (1.6+ 7.2-) 910609 801 1.0- 1.8- 970411 867 0.2- 0.2+ 850613 413 0.1+ 1.4- 910609 801 (3.7+ 0.2-) 970412 360 0.4- 0.1- 850613 413 (2.8+ 3.3-) 910614 801 1.4+ 0.3+ 970412 360 0.5- 0.1- 850613 413 0.9- 1.4+ 910614 801 0.4+ 1.0+ 970415 691 0.2+ 0.4- 850613 413 0.7- 0.5- 1997/ 970415 691 0.3+ 0.5- 850621 413 1.5+ 2.1- 970112 118 1.0- 0.8+ 970415 691 0.4+ 0.4- 850621 413 0.1+ 0.3+ 970112 118 0.8- 1.2+ 970424 897 1.0+ 0.1- 850621 413 (1.5- 3.1+) 970113 118 0.7- 1.1+ 970424 897 1.3+ 0.6+ 850710 413 1.4+ 2.1- 970113 118 0.8- 0.9+ 970425 402 0.6+ 0.1+ 850710 413 (1.4+ 2.9-) 970116 402 0.9- 1.2+ 970425 402 0.6+ 0.1- 850727 675 1.1- 1.6+ 970116 402 0.5- 1.1+ 970425 402 0.5+ 0.2+ 850727 675 1.1- 0.3+ 970116 402 0.3+ 1.1+ 970428 360 0.1- 0.1+ 850728 675 1.6- 0.4- 970118 360 0.7- 0.4- 970428 360 0.1+ 0.2+ 850728 675 0.6- 0.3- 970118 360 1.6- 0.7+ 970502 118 1.2+ 0.1- 850728 675 0.3- 0.5- 970119 360 0.1+ 0.6+ 970502 118 0.5+ 0.0 850729 675 0.7+ 0.8- 970119 360 0.9- 1.1+ 970503 954 0.4+ 0.2- 850729 675 0.0 0.9- 970120 402 1.4- 0.9+ 970503 954 0.4+ 0.5- 850814 474 1.5+ 0.5+ 970120 402 1.1- 1.6+ 970503 954 0.6+ 0.2- 850814 474 0.8+ 0.5- 970120 402 1.1- 1.0+ 970504 563 (2.8+ 0.6+) 1991/ 970204 360 0.2+ 0.2+ 970504 563 (2.9+ 2.9+) 910312 675 0.3- 1.0- 970204 360 0.3- 0.5+ 970504 563 (2.1+ 0.5-) 910312 675 0.7- 0.1+ 970208 046 0.4- 0.0 970504 563 1.8+ 0.7- 910315 103 (4.6- 3.1+) 970208 046 0.2- 0.1- 970509 897 1.6+ 0.7- 910316 474 1.1- 0.4+ 970208 046 0.3- 0.2- 970509 897 0.2- 0.5- 910316 474 0.2+ 1.3- 970305 360 0.0 0.4+ 970514 954 0.2+ 0.0 910316 413 (3.4- 2.5+) 970305 360 0.2+ 0.5+ 970514 954 0.0 0.1- 910318 402 0.0 0.9- 970306 118 0.4- 0.8+ 970515 118 0.5+ 0.1- 910318 402 1.2- 0.8+ 970306 118 0.8- 0.8+ 970515 118 0.3+ 0.1- 910320 372 1.1- 0.6- 970308 402 0.3- 0.1+ 970521 954 (3.3+ 0.1-) 910411 657 0.6+ 1.6+ 970308 402 0.2- 0.2+ 970522 954 (4.1+ 1.4-) 910412 657 (2.1- 1.3-) 970308 402 0.3- 0.1+ 970522 954 (5.0+ 0.6-) 910412 657 0.9- 0.9- 970311 360 0.5+ 0.6+ 970526 360 0.8+ 0.9- 910414 675 1.9- 1.2+ 970311 360 0.5+ 0.6+ 970526 360 1.1+ 0.9- 910414 400 0.6- 0.2+ 970317 118 0.8- 0.3+ 970527 897 (3.1+ 0.1-) 910414 400 0.1+ 0.8- 970317 118 0.7- 0.1- 970602 691 0.3+ 0.4- 910416 675 1.0- 0.6- 970331 118 0.2- 0.1+ 970602 691 0.6+ 0.3- 910419 657 1.9- 1.2- 970331 897 0.6+ 0.9- 970602 691 0.6+ 0.5- 910420 675 0.1- 0.7- 970331 897 0.9+ 0.6- 970610 118 1.8+ 0.9- 910511 801 0.4- 0.3+ 970402 118 0.4- 0.4+ 970610 118 (2.0+ 0.6-) 910511 801 0.3- 0.1+ 970402 118 0.2+ 0.2+ 970629 360 1.0+ 0.2- 910512 801 0.9- 0.1+ 970407 360 0.1- 0.9+ 970629 360 0.8+ 0.5- 910512 801 0.4- 0.2+ 970407 360 0.2- 0.8+ 910515 675 1.6+ 1.5+ 970409 118 0.8+ 0.5+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2000 May 12

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