Nakano Note (Nakano wa Kangaeru noda) NK 3567 P/Spacewatch (2005 JN = 2018 F2)

The following improved orbital elements, by S. Nakano, are from 37 observations 2005 to 2018. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.49 arc second. Residuals on the recovery observations from the prediction in NK 1384 (= HICQ 2018) were +0.59 deg for Right Ascension and -0.30 deg for Declination with the delta-T correction = -1.35 days. Epoch = 2018 July 21.0 TT T = 2018 July 21.80575 +/- 0.01477 (m.e.) TT Peri. = 153.32136 +/- 0.00587 Node = 70.75867 +/- 0.00051 (2000.0) Inc. = 8.85930 +/- 0.00009 q = 2.2778520 +/- 0.0000503 AU e = 0.3490732 +/- 0.0000143 a = 3.4993982 +/- 0.0001090 AU n' = 0.15056153 +/- 0.00000704 P = 6.546 +/- 0.0003060 years (+/- 0.11 day) T = 2005 June 20.08178 TT Epoch = 2005 July 9.0 TT Peri. = 153.55256 e = 0.3490908 Node = 70.79384 (2000.0) a = 3.4972048 AU Inc. = 8.85875 n'= 0.15070320 q = 2.2763627 AU P = 6.540 years [ T = 2012 Jan. 5.16059 TT Epoch = 2011 Dec. 25.0 TT Peri. = 153.47125 e = 0.3473269 Node = 70.78354 (2000.0) a = 3.5033751 AU Inc. = 8.85236 n'= 0.15030524 q = 2.2865587 AU P = 6.557 years ] The predicted orbit for the 2025 return is as follows: T = 2025 Jan. 30.85849 TT Epoch = 2025 Feb. 14.0 TT Peri. = 152.94749 e = 0.3485538 Node = 70.76170 (2000.0) a = 3.4999411 AU Inc. = 8.85638 n'= 0.15052650 q = 2.2800235 AU P = 6.548 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2005/ 050509 683 (2.1- 0.8+) 2018/ 050404 703 (2.2- 2.0-) 050509 683 0.3+ 1.8+ 180317 J04 0.5+ 0.0 050404 703 (0.1- 3.0-) 050512 693 0.5- 0.1- 180317 J04 0.4+ 0.3- 050404 703 0.1+ 1.2- 050512 693 0.6- 0.1- 180317 J04 0.2+ 0.1- 050404 703 1.5- 0.9- 050512 693 0.3- 0.1- 180317 J04 0.2+ 0.2- 050415 699 0.1+ 0.8+ 050513 703 0.0 0.0 180317 G96 0.0 0.2- 050415 699 0.5+ 0.6- 050513 703 0.7+ 0.1+ 180317 G96 0.3- 0.2- 050415 699 (2.8+ 1.2-) 050513 703 (0.6+ 2.8-) 180317 G96 0.6- 0.1- 050415 699 (2.0+ 0.4-) 050513 703 0.3- 0.9- 180317 G96 0.3+ 0.1+ 050503 691 0.2+ 0.1+ 050515 644 0.9- 0.1+ 180321 Z84 0.7- 0.2+ 050503 691 0.5+ 0.4+ 050515 644 0.4- 0.2+ 180321 Z84 0.3+ 0.4+ 050503 691 0.3+ 0.3+ 050515 644 0.4- 0.2+ 180321 Z84 0.3- 0.0 050504 691 0.1+ 0.2+ 050517 J78 (2.1+ 1.7-) 180322 Q11 0.4+ 0.5+ 050504 691 0.3+ 0.1- 050525 213 0.5+ 0.1- 180322 Q11 0.1+ 0.5+ 050504 691 0.0 0.1- 050525 213 0.3+ 0.4- 050509 683 0.4+ 0.1+ 050525 213 0.3+ 0.5- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2018 Mar. 26

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