OAA computing section circular NK 1565 P/2007 R4 (Garradd)
The following improved orbital elements, by S. Nakano, are from 87 observations 2007 Aug. 12 to Dec. 29. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.69 arc second. See an orbit on YC 2568. Epoch = 2007 Sept.17.0 TT T = 2007 Sept.27.28170 +/- 0.00251 (m.e.) TT Peri. = 282.86864 +/- 0.00157 Node = 87.50234 +/- 0.00040 (2000.0) Inc. = 20.22578 +/- 0.00015 q = 1.9213738 +/- 0.0000119 AU e = 0.6714102 +/- 0.0000089 a = 5.8473330 +/- 0.0000278 AU n' = 0.06970555 +/- 0.00000050 P = 14.140 +/- 0.0001010 years (+/- 0.04 day) The predicted orbit for the 2021 return is as follows: T = 2021 Dec. 8.69804 TT Epoch = 2021 Dec. 12.0 TT Peri. = 282.59005 e = 0.6700079 Node = 87.19360 (2000.0) a = 5.9322391 AU Inc. = 20.20957 n'= 0.06821441 q = 1.9575919 AU P = 14.449 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2007/ 071004 673 0.4+ 0.5- 071101 213 0.1- 0.5- 070812 E12 0.7+ 0.3- 071004 673 0.7+ 0.1- 071103 J47 1.3+ 0.6+ 070812 E12 0.5- 0.6- 071004 673 0.7+ 0.2+ 071103 J47 1.6+ 1.2+ 070812 E12 0.1- 1.0- 071004 423 0.8- 0.4+ 071103 J47 0.8+ 1.4+ 070812 E12 0.6+ 0.4+ 071004 423 0.3- 0.4+ 071103 J51 0.7+ 0.2- 070914 E12 0.7- 0.3+ 071008 474 0.5+ 0.5+ 071103 J51 0.7- 0.0 070914 E12 1.4- 0.5- 071008 474 0.2+ 0.1- 071103 J51 1.3- 0.3- 070914 E12 0.6- 0.4- 071010 585 (1.5+ 2.6-) 071106 213 1.0- 1.1- 070914 E12 0.1- 0.1+ 071010 585 0.4- 0.6+ 071106 213 1.2- 0.9- 070914 E12 0.3+ 0.0 071010 585 (0.3- 4.6+) 071106 213 0.7- 0.2+ 070914 E12 0.3+ 0.3- 071013 423 0.1- 0.8+ 071109 474 0.2+ 0.8- 070915 E12 0.1- 0.2- 071013 423 0.3- 0.0 071109 474 0.1+ 0.3- 070915 E12 0.7+ 0.4- 071013 415 1.1+ 0.5- 071111 130 0.2+ 0.2- 070915 E12 0.8+ 0.1- 071013 415 0.8+ 0.7- 071111 130 0.3- 0.2- 070916 I77 1.3+ 1.4+ 071016 E12 0.1+ 0.5- 071117 349 0.2- 0.1+ 070916 I77 0.1- 1.1+ 071018 423 0.3- 0.0 071117 349 0.3- 0.2- 070916 I77 1.2+ 0.4+ 071018 423 0.0 0.2+ 071117 204 0.1- 0.2+ 070916 474 0.2+ 0.3+ 071019 415 1.8+ 1.0- 071117 204 0.5- 0.7- 070916 474 0.0 0.1+ 071019 415 0.4+ 0.6- 071125 213 0.1+ 1.6+ 070916 474 0.2+ 0.3- 071020 423 0.7- 0.1+ 071125 213 0.0 1.3+ 070917 474 0.4+ 0.0 071020 423 0.7- 1.2+ 071128 215 0.2+ 1.1+ 070917 474 0.1- 0.2+ 071023 349 0.8- 0.4+ 071216 349 0.6- 0.2+ 070917 E12 0.3+ 0.1- 071023 349 0.7- 0.9+ 071216 349 1.1- 0.6+ 070918 415 0.7- 0.7- 071029 423 1.4- 1.1+ 071229 215 1.1- 0.1- 070918 415 0.3- 0.2+ 071029 415 0.5+ 0.5- 071229 246 1.4+ 0.5- 070923 204 0.4- 0.1+ 071029 415 0.6+ 0.6- 071229 246 1.3+ 0.6- 071001 423 0.4- 0.6+ 071029 423 0.4- 0.9+ 071229 246 1.5+ 0.2+ 071001 423 0.8- 0.1+ 071031 349 0.1- 1.4- 071229 246 1.2+ 0.8- 071002 423 0.6- 0.2- 071031 349 0.4- 1.2- 071230 415 (2.7+ 1.1+) 071002 423 0.2- 0.6+ 071101 213 0.3- 1.1- 071230 415 (2.5+ 1.8+) 071004 673 0.4- 0.7- 071101 213 0.2- 0.9- ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2008 Feb. 14