OAA computing section circular NK 671 110P/Hartley 3

The following improved orbital elements, by S. Nakano, are from 141 observations 1988-1998. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.74 arc second. Epoch = 1994 May 8.0 TT T = 1994 May 20.64325 +/- 0.00054 (m.e.) TT Peri. = 168.42771 +/- 0.00014 Node = 287.88155 +/- 0.00011 (2000.0) Inc. = 11.69565 +/- 0.00002 q = 2.4612124 +/- 0.0000006 AU e = 0.3170108 +/- 0.0000001 a = 3.6035892 +/- 0.0000003 AU n' = 0.14407915 +/- 0.00000002 P = 6.841 +/- 0.0000009 years T = 1987 July 15.79510 TT Epoch = 1987 July 24.0 TT Peri. = 168.09605 e = 0.3181310 Node = 287.94139 (2000.0) a = 3.5983395 AU Inc. = 11.70390 n'= 0.14439458 q = 2.4535962 AU P = 6.826 years The predicted orbit for the 2001 return is as follows: T = 2001 Mar. 21.41571 TT Epoch = 2001 Apr. 1.0 TT Peri. = 167.93889 e = 0.3146497 Node = 287.75271 (2000.0) a = 3.6161298 AU Inc. = 11.68881 n'= 0.14333032 q = 2.4783155 AU P = 6.876 years The following residuals in seconds of arc are from the above orbital elements: 1988/ 931118 360 0.0 0.1- 940330 360 0.5+ 0.0 880219 675 1.7- 0.3- 931118 360 0.0 0.1- 940403 897 0.7+ 0.2- 880219 675 0.7+ 1.1- 931207 411 0.2- 0.4+ 940403 897 1.4+ 0.6+ 880219 413 0.3- 0.6- 931207 411 0.5- 0.8+ 940408 360 0.8+ 1.2+ 880222 413 (6.0- 1.0+) 931207 411 0.4- 0.6+ 940408 360 1.5+ 1.2+ 880222 413 1.8- 0.4- 931207 897 1.5+ 0.4- 941022 897 (2.0- 1.0+) 880223 413 0.4+ 1.3+ 931207 897 1.7+ 0.7- 941022 897 0.2+ 1.4- 880225 413 (1.0- 2.7+) 931211 897 1.9+ 0.6- 941031 360 0.1- 0.2- 880306 675 0.3- 0.5+ 931211 897 0.8+ 0.8- 941031 360 0.4- 0.1+ 880306 675 0.3- 0.5+ 931212 411 0.0 0.3- 941111 410 0.3+ 0.7+ 880307 675 0.2+ 0.7+ 931212 411 0.4- 0.8- 941111 410 1.1- 0.2+ 880307 675 0.0 0.6+ 931212 411 0.6- 0.9- 941203 897 1.4- 0.2- 880307 675 0.0 0.7+ 931212 360 0.4- 0.6- 941203 897 1.0- 0.4- 880309 372 1.0+ 0.4+ 931212 360 0.3- 0.5- 941206 360 1.4- 0.0 880309 372 0.2- 0.4+ 931215 381 0.2- 0.0 941206 360 0.7- 0.8- 880310 413 0.8+ 0.8+ 931215 381 0.0 0.1- 941221 413 0.8- 0.6- 880313 691 0.5- 0.0 931215 381 0.0 0.0 941221 413 0.8- 0.2- 880313 691 0.2- 0.1+ 931215 360 0.4- 0.0 941222 413 0.6- 0.5- 880313 691 0.4- 0.3+ 931215 360 0.5- 0.1+ 941222 413 0.8- 0.6- 880314 691 0.8+ 0.8+ 931229 897 0.0 0.7+ 941222 413 0.9- 0.5- 880314 691 1.8+ 0.1- 931229 897 0.4+ 0.6+ 1995/ 880314 691 0.5+ 1.0+ 1994/ 950112 413 0.2+ 0.1- 880317 801 1.4+ 0.5- 940104 360 0.2+ 0.5+ 950113 413 0.0 0.2- 880412 413 0.8+ 1.0+ 940104 360 0.3+ 0.5+ 950113 413 0.2- 0.6- 880420 413 1.1+ 0.3- 940106 691 1.5- 0.2+ 950113 413 0.3- 0.3- 880420 413 0.5- 1.6+ 940106 691 1.4- 0.3+ 950115 413 0.2+ 0.2- 880420 413 1.4+ 1.4- 940106 691 1.0- 0.2- 950115 413 0.4+ 0.0 880519 568 (4.3+ 0.8-) 940123 605 1.5+ 0.4+ 950126 360 0.1- 0.4- 1993/ 940123 605 (3.2+ 1.4+) 950126 360 0.1- 0.5- 930623 691 (3.2- 0.3-) 940123 605 (4.2+ 0.7+) 950129 691 0.2+ 1.1- 930623 691 (2.6- 0.7-) 940130 897 1.5+ 0.5+ 950129 691 0.1- 0.9- 930623 691 (2.9- 1.1-) 940130 897 1.5+ 0.6+ 950129 691 0.2- 0.8- 930624 691 1.7- 0.0 940203 360 0.2+ 0.2+ 950201 413 0.4- 0.6- 930624 691 1.7- 0.6- 940203 360 0.1+ 0.2+ 950219 897 0.1+ 1.9+ 930624 691 0.3- 0.5- 940210 897 (2.2+ 2.1+) 950220 897 0.5- 0.5+ 930724 691 (2.2- 0.1-) 940210 897 0.8+ 0.7+ 950220 897 1.3- 0.1- 930724 691 (2.8- 0.1+) 940214 605 (2.7+ 0.6+) 950220 897 1.2+ 0.4- 930724 691 (2.6- 0.2-) 940214 605 0.9+ 1.7+ 950227 360 0.2- 0.3- 930814 691 (2.5- 0.7-) 940214 605 (2.0+ 1.4+) 950227 360 0.3- 0.4- 930814 691 (2.3- 0.4-) 940216 605 1.9+ 1.1+ 950308 360 0.3- 0.4- 930925 360 0.7- 0.4- 940216 605 (1.9+ 2.4+) 950308 360 0.4+ 0.2+ 930925 360 0.6- 0.4- 940216 605 (3.1+ 0.3+) 950321 897 0.2+ 1.1+ 930926 360 0.7- 0.4- 940218 605 (2.0+ 1.5+) 950321 897 (1.0+ 3.3+) 930926 360 0.5- 0.3- 940218 605 0.2+ 0.5+ 950402 693 0.2- 0.3- 931011 360 0.7- 0.6- 940218 605 1.1+ 1.2+ 950402 693 0.3- 0.3- 931011 360 0.8- 0.6- 940218 605 0.5+ 1.9+ 950402 693 0.1- 0.4- 931019 360 1.0- 0.8- 940219 605 (2.5+ 0.9+) 950403 360 0.8+ 0.4+ 931019 360 1.1- 0.8- 940219 605 (1.5+ 2.4+) 950403 360 1.2+ 0.1+ 931020 691 (2.2- 0.3-) 940223 897 0.7+ 1.5+ 950419 897 (4.4+ 2.6+) 931020 691 (2.6- 0.2-) 940223 897 (2.1+ 1.6+) 950419 897 (2.8+ 2.0+) 931114 897 0.8+ 0.2- 940302 360 0.2+ 0.6+ 950419 897 (3.3+ 0.6+) 931114 360 0.1+ 0.6- 940302 360 0.1+ 0.6+ 1998/ 931114 360 0.1- 0.6- 940312 605 (2.2+ 0.1+) 980530 568 0.6+ 0.6+ 931114 897 (0.5+ 2.1-) 940312 605 (2.7+ 0.3+) 980530 568 0.7+ 0.5+ 931115 411 0.5+ 0.6- 940318 691 0.1+ 0.1- 980530 568 1.0+ 0.7+ 931115 411 0.3+ 0.3- 940318 691 0.8+ 0.3+ 980531 568 0.7+ 0.9+ 931115 411 0.2+ 0.3- 940318 691 0.0 0.2- 980531 568 0.6+ 0.5+ 931117 691 1.4- 0.4+ 940321 605 (2.1+ 0.1-) 980618 696 0.7- 0.1+ 931117 691 1.4- 0.2+ 940321 605 (3.0+ 4.3+) 980618 696 0.3- 0.4+ 931117 691 1.4- 0.0 940330 360 0.5+ 0.2+ 980618 696 0.3- 0.3+ ( ) -------- Rejected Obs.

Director, Computing Section Revised version Syuichi Nakano 1998 July 22

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