Nakano Note (Nakano wa Kangaeru noda) NK 2281 P/Larsen (2004 H3 = 2012 L4)

The following improved orbital elements, by S. Nakano, are from 93 observations 2004 to 2012. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.64 arc second. The delta-T correction for the prediction in NK 1175 (= HICQ 2010/ 2011 = HICQ 2011/2012) was -1.68 days with RunOff values +34'(R. A.) and +8'(Decl.) on 2012 June observations. Epoch = 2011 Nov. 15.0 TT T = 2011 Nov. 21.95880 +/- 0.02011 (m.e.) TT Peri. = 346.55428 +/- 0.00503 Node = 220.94652 +/- 0.00003 (2000.0) Inc. = 25.12012 +/- 0.00026 q = 2.4501234 +/- 0.0000154 AU e = 0.3723721 +/- 0.0000036 a = 3.9037834 +/- 0.0000086 AU n' = 0.12778371 +/- 0.00000042 P = 7.713 +/- 0.0000254 years T = 2004 Mar. 13.15846 TT Epoch = 2004 Mar. 16.0 TT Peri. = 346.55937 e = 0.3739477 Node = 220.97343 (2000.0) a = 3.8928159 AU Inc. = 25.14665 n'= 0.12832411 q = 2.4371065 AU P = 7.681 years The predicted orbit for the 2019 return is as follows: T = 2019 Aug. 4.99945 TT Epoch = 2019 July 16.0 TT Peri. = 346.64017 e = 0.3737580 Node = 220.90283 (2000.0) a = 3.8938216 AU Inc. = 25.15032 n'= 0.12827440 q = 2.4384747 AU P = 7.684 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2004/ 040424 474 0.3- 0.1- 040515 704 0.6+ 0.1+ 040422 691 0.2- 0.0 040424 474 0.6+ 1.1- 040515 704 0.8+ 0.1+ 040422 691 0.2- 0.0 040425 859 0.3- 0.4- 040515 704 (2.5+ 1.0-) 040422 691 0.1- 0.0 040425 859 0.3+ 0.4- 040515 704 1.6+ 0.2- 040422 428 1.1- 0.5- 040425 859 (2.1- 0.3+) 040515 704 (0.1- 2.5+) 040422 428 0.4- 0.9- 040425 704 0.0 0.5+ 040516 104 0.6- 1.9+ 040422 428 (2.1- 0.5-) 040425 704 0.6- 0.4+ 040516 104 0.7- 0.3- 040422 113 1.0+ 0.4- 040425 704 0.2+ 1.0+ 040516 104 0.7+ 1.6+ 040422 113 0.7+ 0.2- 040425 372 (2.4+ 2.8-) 040517 704 0.1+ 0.0 040422 113 0.6+ 0.3+ 040426 204 0.1- 0.1+ 040517 704 0.6+ 0.7+ 040423 704 0.2- 0.7+ 040426 204 0.7- 0.3- 040517 704 0.4- 0.8+ 040423 704 0.1- 1.2+ 040426 204 0.3- 0.7- 040517 215 0.8- 0.5- 040423 704 0.3- 0.8+ 040426 699 1.3- 0.0 040521 704 0.1- 0.1- 040423 704 0.0 1.5- 040426 699 0.2- 0.4+ 040521 704 0.5+ 1.1+ 040423 704 0.8+ 1.7+ 040426 699 0.4+ 0.2+ 040521 704 0.6- 0.3+ 040423 704 0.6+ 0.4- 040426 699 0.0 0.3- 040521 704 0.1+ 0.8+ 040423 704 (0.7+ 2.2+) 040427 D74 (3.0+ 5.1-) 040521 704 0.4+ 0.7+ 040423 704 0.2- 0.3+ 040427 D74 (0.5- 2.2-) 040524 360 0.4+ 0.7- 040423 474 0.8+ 0.1- 040427 D74 (3.2- 2.5+) 040524 360 0.3+ 0.5- 040423 474 0.1+ 0.0 040428 360 0.4+ 0.5- 040524 360 0.7+ 1.1- 040423 474 0.1- 0.3- 040428 360 0.9- 0.8+ 040605 170 0.3- 1.4- 040423 428 0.7- 0.9- 040428 360 0.4- 0.0 040605 170 0.3- 1.2- 040423 428 0.9- 0.2- 040510 608 0.6+ 0.9+ 040605 170 0.4+ 1.7- 040423 428 0.5- 1.0+ 040510 608 0.0 1.5+ 040613 360 0.5+ 0.9- 040423 428 0.1+ 0.1- 040510 608 0.9+ 1.5+ 040613 360 0.3- 0.1- 040423 J87 1.3+ 0.0 040512 699 0.4- 0.3- 040613 360 0.3+ 0.4- 040423 J87 0.6- 0.9- 040512 699 0.1+ 0.8+ 2012/ 040423 J87 0.7- 0.3+ 040512 699 0.1- 0.4- 120615 461 0.1+ 0.2+ 040423 J87 1.1- 0.9- 040512 699 0.4+ 0.1- 120615 461 0.2- 0.6+ 040424 651 0.3- 0.3- 040514 360 0.6+ 0.4- 120615 461 1.0- 0.3+ 040424 651 0.5+ 0.2+ 040514 360 0.2- 0.4- 120616 461 0.1- 0.4- 040424 651 0.0 0.0 040514 360 0.2+ 0.2- 120616 461 0.5+ 0.5+ 040424 474 0.2- 0.2+ 040515 J87 0.8- 0.1- 120616 461 0.3+ 0.3- 040424 474 0.9- 0.5- 040515 J87 0.8+ 0.3- 120616 461 0.1+ 0.1- 040424 474 0.1+ 0.8- 040515 J87 0.3- 0.2- Not included: 120618 H06 0.0 0.1+ 120618 H06 0.3- 0.4- 120618 H06 0.9- 1.3- ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 June 19

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