OAA computing section circular NK 673 45P/Honda-Mrkos-Pajdusakova

The following improved orbital elements, by S. Nakano, are from 135 observations 1980-1996, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta and non-gravitational effect of style II. The mean residual is +/- 1.00 arc second. Epoch = 1995 Dec. 29.0 TT T = 1995 Dec. 25.98453 +/- 0.00005 (m.e.) TT Peri. = 326.05972 +/- 0.00080 Node = 89.14960 +/- 0.00075 (2000.0) Inc. = 4.24820 +/- 0.00004 q = 0.5320522 +/- 0.0000017 AU e = 0.8242462 +/- 0.0000007 a = 3.0272580 +/- 0.0000051 AU n' = 0.18712418 +/- 0.00000047 P = 5.267 +/- 0.0000132 years A1 = -0.084 +/- 0.027 A2 = -0.06688 +/- 0.00113 T = 1980 Apr. 11.08067 TT Epoch = 1980 May 1.0 TT Peri. = 184.61100 e = 0.8086269 Node = 233.64456 (2000.0) a = 3.0339660 AU Inc. = 13.11421 n'= 0.18650394 q = 0.5806193 AU P = 5.285 years T = 1985 May 23.85694 TT Epoch = 1985 May 15.0 TT Peri. = 325.70789 e = 0.8216676 Node = 89.37129 (2000.0) a = 3.0412651 AU Inc. = 4.21516 n'= 0.18583292 q = 0.5423562 AU P = 5.304 years T = 1990 Sept.12.68226 TT Epoch = 1990 Sept.26.0 TT Peri. = 325.79012 e = 0.8218826 Node = 89.30311 (2000.0) a = 3.0387710 AU Inc. = 4.21960 n'= 0.18606175 q = 0.5412579 AU P = 5.297 years The predicted orbit for the 2001 return is as follows: T = 2001 Mar. 29.88552 TT Epoch = 2001 Apr. 1.0 TT Peri. = 326.13900 e = 0.8250925 Node = 89.07631 (2000.0) a = 3.0211013 AU Inc. = 4.25541 n'= 0.18769648 q = 0.5284133 AU P = 5.251 years The following residuals in seconds of arc are from the above orbital elements: 1980/ 951220 422 0.8- 0.4- 960209 118 0.4- 1.1- 800501 372(0.03+ 0.00-)Y 951220 422 0.4+ 1.4- 960209 118 0.1- 0.7- 800506 372 0.5- 0.5+ Y 951221 422 2.1+ 0.8- 960209 118 0.4- 0.6- 800506 372 0.8+ 0.1- Y 951221 422 (2.5+ 1.4-) 960210 118 0.2- 1.0- 800507 568 (4.2- 3.7-) 951225 422 0.2+ 2.2- 960210 118 0.6- 1.0- 800513 568 0.2+ 0.2- 951225 422 1.6+ 1.9- 960210 118 0.9- 0.8- 800514 568 0.4- 0.2+ 951225 422 0.5+ 1.3- 960211 422 1.8+ 1.2- 1990/ 951228 422 (3.5+ 1.8-) 960211 422 0.1+ 1.9- 900617 691 1.1+ 0.3- 951228 422 2.2+ 0.9- 960211 900 0.2- 1.1- 900617 691 0.5+ 0.1+ 951228 422 2.0+ 2.2- 960211 900 0.1- 1.0- 900617 675 1.3- 0.0 951230 897 (0.9+ 2.3-) 960212 897 1.6- 0.9- 900617 691 0.4+ 0.9- 951230 897 1.6+ 2.1- 960212 897 0.6- 0.4- 900617 675 1.2- 0.2- 951230 897 2.2+ 1.9- 960212 897 1.0- 1.6- 900617 691 0.7+ 0.6+ 1996/ 960214 568 1.5+ 0.5+ 900617 691 0.5+ 0.3- 960101 897 (2.0+ 2.6-) 960214 568 0.1+ 0.3- 900618 675 1.1+ 1.1- 960101 897 1.6+ 1.0- 960214 568 1.8+ 0.0 900618 691 1.5- 0.6+ 960101 897 (0.6+ 3.1-) 960218 897 0.7- 0.7- 900618 675 0.1+ 1.3- 960127 897 (2.4- 2.8-) 960218 897 0.8- 0.8- 900618 691 0.3+ 0.3+ 960127 897 (2.8- 2.4-) 960221 372 1.2+ 1.5+ 900618 675 0.5+ 1.1- 960127 900 (2.4- 3.8-) 960222 691 0.4- 0.8+ 900618 691 0.8+ 0.1- 960127 900 (3.0- 3.3-) 960222 900 0.6+ 0.0 900618 675 0.2- 1.0- 960131 897 (5.8- 1.8-) 960222 900 0.3+ 0.2+ 900715 675 (5.3- 5.2-) 960131 897 (4.2- 4.2-) 960223 046 0.1- 0.8+ 900715 675 (4.4- 5.2-) 960131 897 (6.9- 3.1-) 960223 046 0.1- 0.9+ 900715 675 (4.8- 5.1-) 960201 611 (7.9- 2.1-) 960223 046 0.5- 1.1+ 900715 675 (4.9- 5.4-) 960201 611 (4.3- 1.5-) 960223 372 1.7- 0.8+ 900802 657(10.1- 7.8-) 960201 422 (0.2+ 3.5-) 960225 118 0.3+ 1.7+ 900824 657 (0.4+ 3.3-) 960201 422 (1.6- 3.5-) 960226 118 0.2+ 1.2+ 900919 372 0.5+ 0.7- 960202 568 (1.0- 3.5-) 960227 897 0.7- 0.9+ 900921 657 0.9- 0.0 960202 422 (2.5- 3.4-) 960227 897 1.5+ 0.1- 1995/ 960202 422 (2.6- 2.8-) 960228 372 1.1- 0.3+ 950921 568 0.2+ 1.7+ 960202 422 (1.7- 4.4-) 960228 900 0.8- 0.6+ 951021 568 0.3+ 0.2+ 960202 900 (2.5- 3.6-) 960228 900 0.5- 0.9+ 951021 568 1.0- 0.1- 960202 900 (2.0- 3.6-) 960228 360 0.6- 0.8+ 951022 568 0.3- 0.9+ 960203 422 (1.7- 3.2-) 960228 360 0.7- 0.7+ 951022 568 0.4- 0.7+ 960203 422 (2.2- 3.9-) 960301 612 0.0 1.4+ 951116 360 0.1+ 0.3- 960203 422 (1.0- 3.6-) 960302 900 0.3+ 1.1+ 951116 360 0.8+ 0.8- 960203 897 (3.3- 4.9-) 960302 900 0.2+ 1.7+ 951116 360 0.9+ 0.1+ 960203 897 (1.8- 3.7-) 960302 120 0.1+ 0.2+ 951118 360 1.1+ 0.9+ 960205 900 1.9- 1.8- 960302 120 0.4+ 1.7+ 951118 360 0.1+ 0.3- 960205 900 (0.9- 2.8-) 960302 120 0.1+ 0.8+ 951118 360 1.2+ 0.7+ 960206 118 (0.2- 2.8-) 960308 612 (1.8+ 4.2-) 951124 897 0.8+ 0.8- 960206 118 1.1- 1.4- 960309 605 (4.7+ 2.1-) 951124 897 0.0 1.4- 960206 118 0.7+ 1.6- 960309 605 0.5- 1.2+ 951124 897 1.5+ 1.8+ 960206 118 0.5+ 1.3- 960309 605 2.1- 0.9+ 951127 897 0.9+ 1.7+ 960206 897 0.5- 1.7- 960310 118 0.7+ 0.7+ 951127 897 0.2+ 0.9+ 960207 046 (0.3+ 2.7-) 960310 612 (0.3- 2.6+) 951127 897 0.7- 1.5+ 960207 046 (0.9+ 3.4-) 960310 612 (3.8+ 0.2-) 951127 897 1.1+ 1.9+ 960207 046 (0.8- 2.7-) 960313 900 0.8- 1.5+ 951208 897 0.2- 0.7- 960207 046 (1.2- 3.3-) 960313 897 1.3+ 1.4+ 951208 897 0.7+ 1.3+ 960207 120 (3.1- 0.7-) 960313 897 0.1+ 0.8+ 951208 897 0.9+ 1.1+ 960207 120 (0.9+ 2.4-) 960313 897 0.5+ 0.2- 951210 356 1.8+ 0.5+ 960207 120 (0.2+ 3.2-) 960313 900 0.0 0.6+ 951210 356 0.6+ 0.5+ 960207 611 (5.2+ 2.9-) 960313 897 0.3+ 2.0- 951210 360 0.5- 1.0- 960207 900 0.1+ 1.7- 960315 605 (3.4- 0.8+) 951210 360 0.4- 1.0- 960207 422 (0.2- 2.8-) 960315 605 (6.3+ 0.2+) 951210 360 0.5- 1.0- 960207 422 0.0 1.8- 960317 557 0.0 0.8+ 951210 356 2.1+ 0.5+ 960207 422 (0.1+ 3.1-) 960317 557 0.5- 1.2+ 951210 359 0.2- 0.7+ 960207 900 (0.3+ 2.4-) 960317 557 0.6- 1.4+ 951210 359 1.8+ 0.3+ 960209 557 1.2+ 2.2- 960318 801 0.5- 0.8+ 951211 897 0.5+ 0.6- 960209 557 0.3- 1.7- 960318 801 0.2- 1.2+ 951211 897 0.4- 0.1- 960209 356 (2.8- 1.0-) 960322 897 (2.5+ 0.6+) 951211 897 1.0+ 1.9- 960209 356 (2.5- 0.3-) 960419 691 0.8- 1.0+ 951216 422 (3.2+ 0.8-) 960209 356 (3.5- 2.0-) 960419 691 0.5- 0.9+ 951218 897 0.2+ 0.6+ 960209 118 0.3- 1.2- 960420 691 0.4- 1.0+ 951218 897 0.6- 0.7- 960209 118 0.5- 0.8- 960420 691 0.7- 1.3+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 1998 Apr. 30

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