OAA computing section circular NK 1054 125P/Spacewatch
The following improved orbital elements, by S. Nakano, are from 175 observations 1991 to 2002. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.65 arc second. Epoch = 2002 Feb. 15.0 TT T = 2002 Jan. 28.05225 +/- 0.00012 (m.e.) TT Peri. = 87.30034 +/- 0.00009 Node = 153.23693 +/- 0.00008 (2000.0) Inc. = 9.98153 +/- 0.00002 q = 1.5285938 +/- 0.0000003 AU e = 0.5115395 +/- 0.0000001 a = 3.1294114 +/- 0.0000003 AU n' = 0.17803692 +/- 0.00000003 P = 5.536 +/- 0.0000008 years T = 1990 Dec. 21.85871 TT Epoch = 1990 Dec. 15.0 TT Peri. = 87.15429 e = 0.5080840 Node = 153.42197 (2000.0) a = 3.1390213 AU Inc. = 9.96576 n'= 0.17721998 q = 1.5441349 AU P = 5.561 years T = 1996 July 14.58699 TT Epoch = 1996 July 16.0 TT Peri. = 87.26947 e = 0.5090874 Node = 153.36913 (2000.0) a = 3.1368428 AU Inc. = 9.96904 n'= 0.17740463 q = 1.5399156 AU P = 5.556 years The predicted orbit for the 2007 return is as follows: T = 2007 Aug. 10.73376 TT Epoch = 2007 Aug. 8.0 TT Peri. = 87.33763 e = 0.5126914 Node = 153.19987 (2000.0) a = 3.1265619 AU Inc. = 9.98563 n'= 0.17828037 q = 1.5236005 AU P = 5.528 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1991/ 960410 360 0.4+ 0.5+ 960618 691 0.6- 0.4+ 910908 691 0.0 0.7- 960410 120 0.1+ 0.0 960618 691 0.6- 0.6+ 910908 691 0.5+ 0.8- 960410 120 0.7+ 0.3- 960628 118 0.9- 0.2+ 910908 691 0.2- 0.2+ 960410 104 0.6+ 0.6+ 960703 118 0.1+ 0.6- 910908 691 1.4+ 0.3- 960410 104 0.6+ 0.3+ 960703 118 0.4+ 0.8- 910908 691 1.2+ 0.3- 960410 104 0.5+ 0.4+ 960709 118 1.1- 0.4+ 910908 691 0.9+ 0.5- 960410 104 0.4+ 0.4+ 960709 118 (2.2- 0.1+) 910909 691 0.0 0.3+ 960411 118 0.9+ 0.1+ 960710 360 0.5- 0.1+ 910909 691 1.0+ 0.7- 960411 118 0.8+ 0.0 960710 360 0.7- 0.2+ 910909 691 1.2+ 1.0- 960412 897 0.3- 0.1- 960711 897 0.0 0.3- 910910 691 0.9+ 0.8- 960412 897 0.1+ 0.0 960711 897 0.6+ 0.4- 910910 691 0.6+ 0.3- 960415 587 0.3+ 0.1- 960715 360 0.5- 0.6+ 910910 691 0.6+ 0.3+ 960415 587 0.9+ 0.5+ 960715 360 0.6- 0.3+ 910912 691 1.0+ 0.4- 960417 557 0.0 0.2- 960718 388 0.8- 1.2+ 910912 691 0.2+ 0.2- 960417 557 0.2+ 0.2- 960718 388 1.1- 1.4+ 910912 691 0.5+ 0.0 960417 557 0.3+ 0.2- 960720 118 0.1+ 0.3- 910915 691 0.7- 0.6- 960419 118 0.1- 0.1- 960720 118 0.1+ 0.1+ 910915 691 1.1- 0.3+ 960420 372 0.4- 1.6- 960726 118 0.2- 0.3- 910915 691 1.3- 0.5- 960421 421 0.2+ 0.5- 960726 118 0.9- 0.0 910915 691 1.2- 0.0 960421 421 0.3+ 0.9- 960812 360 0.3- 0.0 910917 691 0.1+ 0.9+ 960421 421 0.0 0.8- 960812 360 0.1+ 0.1- 910917 691 1.5- 0.8- 960422 360 0.5+ 0.1+ 960814 801 (4.5+ 1.2+) 911004 691 0.3+ 0.3- 960422 360 0.6+ 0.2+ 960814 801 1.4+ 0.1+ 911004 691 0.9- 1.9- 960423 385 0.1+ 0.6- 960815 897 1.0+ 0.6- 911004 691 0.5+ 0.2- 960423 385 0.0 0.8- 960815 897 0.5+ 0.5+ 911011 691 0.6- 0.1+ 960423 385 0.5+ 0.9- 960815 421 0.5+ 0.1- 911011 691 0.1+ 0.6- 960424 385 0.4+ 0.5- 960815 421 1.2+ 0.2+ 911015 691 2.2- 1.1+ 960424 385 0.4- 0.8- 960815 421 1.1+ 0.1- 911015 691 1.6- 1.6+ 960424 385 0.2- 1.1- 960817 472 (2.8+ 2.1-) 911015 691 1.3- 1.9+ 960503 658 0.3- 0.0 960817 472 (3.8+ 3.6-) 911109 695 0.0 0.7- 960503 658 0.6- 0.5+ 960819 801 (2.8+ 1.6-) 1996/ 960503 658 0.3- 0.0 960819 801 0.4+ 0.1- 960311 372 1.1+ 0.6- 960503 658 0.5- 0.2- 960819 360 0.0 0.1+ 960313 372 (0.1+ 2.2+) 960505 658 1.4- 0.3- 960819 360 0.0 0.0 960313 372 (0.6- 2.7+) 960505 658 1.3- 0.4- 960901 897 0.0 0.3- 960315 372 0.5+ 1.3+ 960505 658 1.3- 0.4- 960901 897 1.3+ 0.0 960317 372 0.6+ 1.8+ 960509 385 0.1- 0.6- 960902 897 1.9+ 1.4- 960321 691 0.4+ 0.4+ 960509 385 0.1- 0.3+ 960902 897 1.8+ 0.2+ 960321 691 0.1+ 0.2+ 960515 691 (0.1+ 2.5+) 960902 897 1.4+ 0.2+ 960321 691 0.2+ 0.4+ 960515 691 (0.1+ 2.6+) 960902 360 0.7+ 0.0 960322 691 0.2+ 0.7+ 960515 691 (0.0 2.5+) 960902 360 1.1+ 0.1+ 960322 691 0.5+ 0.7+ 960515 360 0.5- 0.0 2002/ 960322 691 0.4+ 0.6+ 960515 360 0.5- 0.0 020312 340 (3.4- 0.4+) 960322 372 (5.3- 1.7+) 960516 118 0.5- 0.1+ 020312 340 (4.8- 0.1-) 960322 372 0.4+ 0.7+ 960522 360 0.6- 0.4+ 020312 340 (5.7- 0.6-) 960325 367 0.4- 0.7+ 960522 360 0.8- 0.7+ 020312 340 (3.0- 0.9-) 960325 367 0.2- 0.5+ 960602 709 0.9- 0.4+ 020613 291 0.6- 0.5+ 960325 367 0.0 0.7+ 960602 709 0.7- 0.1+ 020613 291 1.4- 0.4+ 960327 046 0.8+ 0.2+ 960602 709 0.4- 0.2+ 020613 291 0.5+ 0.9+ 960327 046 0.7+ 0.5+ 960602 709 0.4- 0.1- 020817 644 0.9+ 0.4- 960327 046 0.4+ 0.2+ 960602 709 0.4- 0.0 020817 644 1.0+ 0.0 960406 897 (0.2+ 3.6-) 960602 709 0.6- 0.0 020818 644 0.0 0.4- 960406 897 0.3+ 1.6- 960602 709 0.6- 0.1+ 020818 644 0.2- 0.1+ 960406 120 0.4- 0.9- 960602 709 0.3+ 0.6+ 020818 644 0.2- 0.0 960406 120 0.7- 0.6- 960605 421 1.2- 0.2+ 020829 644 0.3- 0.9+ 960407 360 (1.4+ 4.3+) 960605 421 0.7- 0.2- 020829 644 0.2+ 0.9+ 960407 360 (1.4+ 4.3+) 960605 421 0.7- 0.1+ 020829 644 0.1+ 1.4+ 960409 867 0.1+ 0.1+ 960606 360 1.1- 0.1+ 020901 644 0.3- 0.3+ 960409 867 0.2- 0.4+ 960606 360 1.1- 0.0 020901 644 0.3- 0.0 960409 867 0.3+ 0.0 960611 557 0.8- 0.0 020904 644 0.5- 0.3+ 960409 104 0.0 0.3- 960611 557 0.7- 0.1+ 020904 644 0.6- 0.4+ 960409 104 0.1+ 0.2- 960611 557 0.6- 0.6+ 020904 644 0.4- 0.2+ 960409 104 0.2- 0.2- 960611 587 0.1+ 0.4- 020916 644 0.1+ 1.1+ 960409 104 1.1+ 0.0 960611 587 0.2+ 0.5- 020916 644 0.9- 0.3+ 960409 104 0.1+ 0.1- 960611 587 0.4- 0.5- 960410 360 0.2+ 0.3+ 960618 691 0.3- 0.5+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2004 Apr. 8