OAA computing section circular NK 1232 P/2004 H2 (Larsen)

The following improved orbital elements, by S. Nakano, are from 66 observations 2004 Apr. 19 to July 9. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.67 arc second. See an orbit on YC 2426. Epoch = 2004 Apr. 25.0 TT T = 2004 May 10.96314 +/- 0.03669 (m.e.) TT Peri. = 104.56091 +/- 0.01154 Node = 131.55210 +/- 0.00158 (2000.0) Inc. = 11.78674 +/- 0.00020 q = 2.6172838 +/- 0.0000552 AU e = 0.4187655 +/- 0.0000081 a = 4.5029741 +/- 0.0000253 AU n' = 0.10314660 +/- 0.00000087 P = 9.555 +/- 0.0000806 years (+/- 0.03 day) The predicted orbit for the 2013 return is as follows: T = 2013 Dec. 11.62194 TT Epoch = 2013 Dec. 14.0 TT Peri. = 104.60117 e = 0.4175288 Node = 131.50717 (2000.0) a = 4.5257416 AU Inc. = 11.77286 n'= 0.10236923 q = 2.6361141 AU P = 9.628 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2004/ 040421 673 0.7+ 0.7+ 040522 703 (3.3- 1.9+) 040419 691 0.3+ 0.0 040421 673 0.7+ 0.6+ 040524 704 0.2+ 0.1+ 040419 691 0.1- 0.5+ 040423 360 0.1- 1.5- 040524 704 1.5+ 0.2- 040419 691 0.2+ 0.3- 040423 360 0.7- 1.2- 040524 704 0.5- 0.2+ 040420 291 1.0+ 0.6+ 040423 360 1.8- 0.6- 040524 704 0.2+ 0.3+ 040420 291 1.4+ 1.1- 040424 170 0.7- 0.1+ 040524 704 0.4- 0.4+ 040420 291 (0.8- 2.0-) 040424 170 0.5- 0.1+ 040524 360 0.6+ 0.1+ 040420 176 0.3- 0.4+ 040424 170 0.4+ 1.0- 040524 360 0.1- 0.0 040420 176 0.1- 0.4+ 040425 372 1.2- 1.9- 040524 360 0.4+ 0.1- 040420 176 0.3+ 0.1+ 040428 360 0.2- 0.0 040605 170 0.2+ 1.0+ 040421 113 1.2- 0.5+ 040428 360 0.9- 0.3+ 040605 170 0.3- 0.8+ 040421 113 0.9- 0.4+ 040430 118 0.0 0.3- 040613 360 0.0 0.5+ 040421 113 0.8- 0.7+ 040430 118 1.6+ 0.9+ 040613 360 0.2- 0.0 040421 854 (2.4- 0.5+) 040514 699 (2.2- 2.9+) 040613 360 0.5+ 0.0 040421 854 0.3+ 0.3+ 040514 699 1.0- 0.4- 040621 246 0.8+ 0.1- 040421 H36 1.5- 0.1- 040514 699 0.5- 0.1- 040621 246 1.0+ 0.4- 040421 673 0.7+ 0.1- 040514 699 1.4- 0.0 040621 246 1.3+ 0.2- 040421 H36 0.3+ 0.0 040514 360 0.2+ 0.1+ 040622 691 0.1+ 0.3- 040421 673 0.8+ 0.2+ 040514 360 0.4- 0.1+ 040622 691 0.4- 0.1+ 040421 711 0.6+ 0.1+ 040514 360 0.1+ 0.6- 040622 691 0.7- 0.5+ 040421 673 1.0+ 0.2+ 040517 215 0.0 1.0- 040709 213 0.4- 0.6- 040421 673 1.1+ 0.5+ 040522 703 0.0 0.2- 040709 213 0.3- 0.5- 040421 H36 0.5+ 0.6- 040522 703 0.6+ 0.3- 040709 213 0.6- 0.2- 040421 711 0.3+ 0.4+ 040522 703 1.5- 1.7+ ( ) -------- Rejected Obs.

Director, Computing Section Late edition Syuichi Nakano 2004 July 19

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