OAA computing section circular NK 1561 C/2007 D3 (LINEAR)

The following improved orbital elements, by S. Nakano, are from 99 observations 2007 Jan. 25 to 2008 Jan. 29. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.59 arc second. The comet will pass 2.90 AU from Saturn on 2009 June 29 UT. See orbits on YC 2547 (= HICQ 2007) and YC 2551. Epoch = 2007 May 20.0 TT T = 2007 May 27.78096 +/- 0.01171 (m.e.) TT Peri. = 309.10009 +/- 0.00134 Node = 148.43474 +/- 0.00012 (2000.0) Inc. = 45.91608 +/- 0.00006 q = 5.2090375 +/- 0.0000262 AU e = 0.9919828 +/- 0.0000405 1/a = +0.0015391 +/- 0.0000078 1/AU origin = +0.001293 (Q= 7) future = +0.001388 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2007/ 070221 246 0.1+ 0.4+ 070317 170 0.5+ 0.2- 070125 704 0.3- 1.4- 070221 246 0.4+ 0.8+ 070317 170 0.0 0.7- 070125 704 0.5+ 0.3- 070221 246 0.3+ 0.0 070318 213 0.6+ 0.8- 070125 704 0.7- 0.0 070221 246 0.4+ 0.0 070318 213 0.3+ 0.5- 070125 704 0.2+ 0.2- 070222 850 0.0 0.1- 070318 213 0.3+ 0.7- 070125 704 0.0 0.7- 070222 850 0.1- 0.1- 070320 703 1.0- 0.7- 070220 704 0.2+ 0.1- 070227 850 1.2- 1.3+ 070320 703 1.5- 0.9- 070220 704 0.2+ 0.6- 070227 850 0.0 0.5+ 070320 703 1.0- 0.5+ 070220 704 0.9+ 0.8+ 070228 850 0.6- 0.5- 070320 703 0.1- 0.1+ 070220 704 1.0+ 0.7+ 070228 850 0.1+ 0.2+ 070407 415 0.5+ 0.4- 070220 I77 2.0+ 0.5- 070228 850 0.5+ 0.5- 070407 415 1.9+ 0.3+ 070220 I77 1.2+ 0.6- 070308 850 0.3- 0.0 070512 415 0.6- 0.2+ 070220 I77 0.7- 0.5- 070308 850 0.1- 0.2- 070512 415 1.1- 0.8+ 070221 734 0.3- 0.1+ 070312 850 0.5- 0.3+ 071201 349 0.8- 0.1- 070221 734 0.0 0.1+ 070312 850 0.3- 0.1- 071205 349 0.6- 1.0- 070221 734 0.5+ 0.1+ 070312 215 0.8+ 0.4+ 071207 349 0.7- 0.3+ 070221 682 0.1- 0.8+ 070313 104 (0.4+ 3.7-) 071207 349 1.1- 0.2+ 070221 854 0.3- 0.3- 070313 104 0.6- 1.2+ 071219 204 0.5+ 0.2- 070221 854 0.3- 0.5+ 070313 104 0.2+ 0.7+ 071219 204 1.1+ 0.2+ 070221 448 0.4- 0.1+ 070313 104 0.7- 0.2- 071228 415 0.5+ 0.1- 070221 682 0.0 1.3+ 070314 415 1.3+ 0.3+ 071228 415 0.1- 0.0 070221 854 0.2+ 0.2+ 070314 415 1.2+ 0.2+ 071229 415 0.1+ 0.5+ 070221 448 0.2- 0.6+ 070314 213 0.2+ 0.4+ 071229 415 0.0 0.3- 070221 448 0.1- 0.1- 070314 213 0.0 0.3+ 071231 415 1.1+ 0.9- 070221 G96 0.2- 0.3- 070314 213 0.1+ 0.2+ 071231 415 0.5+ 0.3- 070221 G96 0.4- 0.3- 070316 246 0.2- 0.4+ 2008/ 070221 G96 0.2- 0.1- 070316 246 0.1+ 0.2+ 080110 H45 1.9- 0.8+ 070221 G96 0.5- 0.0 070316 246 0.0 0.3+ 080110 H45 0.2- 0.9+ 070221 474 0.1- 0.1- 070316 246 0.2+ 0.2- 080110 H45 0.5+ 0.4+ 070221 474 0.2- 0.1- 070316 246 0.0 0.2+ 080110 H45 1.0+ 0.6+ 070221 474 0.2- 0.1- 070316 246 0.0 0.5- 080110 349 0.3- 0.9- 070221 474 0.0 0.1- 070316 246 0.1+ 1.0- 080110 349 0.0 0.7- 070221 246 1.0- 0.1- 070316 246 0.1+ 0.4- 080129 204 0.1- 0.1+ 070221 246 0.9- 0.1- 070317 170 0.3+ 0.0 080129 204 0.4+ 0.0 ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2008 Feb. 13

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