Nakano Note (Nakano wa Kangaeru noda) NK 3004 P/2015 A1 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 57 observations 2015 Jan. 8 to Sept. 13. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.41 arc second. 2015 Sept. observations show the residual of -6" mainly for R. A. from an orbit in NK 2977 (= HICQ 2015). Epoch = 2015 Feb. 27.0 TT T = 2015 Mar. 13.05451 +/- 0.00041 (m.e.) TT Peri. = 244.87813 +/- 0.00017 Node = 341.08604 +/- 0.00004 (2000.0) Inc. = 80.36575 +/- 0.00003 q = 1.9955030 +/- 0.0000020 AU e = 0.9008151 +/- 0.0000065 a = 20.1190306 +/- 0.0000661 AU n' = 0.01092178 +/- 0.00000005 P = 90.242 +/- 0.0004452 years (+/- 0.16 day) The predicted orbit for the 2105 return is as follows: T = 2105 Apr. 2.35581 TT Epoch = 2105 Apr. 16.0 TT Peri. = 244.88899 e = 0.9009999 Node = 341.15450 (2000.0) a = 20.0983636 AU Inc. = 80.39284 n'= 0.01093863 q = 1.9897404 AU P = 90.103 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2015/ 150114 807 0.1- 0.0 150325 Q62 0.9+ 0.3+ 150108 F51 0.2+ 0.0 150114 807 0.1+ 0.0 150401 W96 0.8+ 0.0 150108 F51 0.2+ 0.1- 150114 807 0.2- 0.4+ 150401 W96 0.5+ 0.4+ 150108 F51 0.1+ 0.1- 150116 474 0.1- 0.1+ 150514 W96 0.3+ 0.4- 150108 F51 0.1+ 0.0 150116 474 0.3- 0.3+ 150514 W96 1.2+ 1.1- 150110 807 0.3- 0.2- 150116 474 0.0 0.2- 150710 474 0.2- 0.0 150110 807 0.3- 0.1+ 150116 474 0.7- 0.4+ 150710 474 0.2- 0.3- 150110 807 0.1- 0.0 150116 Q62 0.0 0.3+ 150710 474 0.2- 0.5+ 150110 F51 0.1+ 0.1- 150116 Q62 0.0 0.4+ 150720 474 0.2+ 0.5- 150110 F51 0.1+ 0.3+ 150116 Q62 0.1+ 0.4+ 150720 474 0.5- 0.6+ 150110 F51 0.2+ 0.4- 150131 Q62 0.1- 0.5+ 150720 474 0.4- 0.6- 150111 807 0.3- 0.1+ 150131 Q62 0.4- 0.4+ 150720 474 0.4- 0.1- 150111 807 0.6- 0.4+ 150221 W96 0.4- 0.1- 150825 474 0.0 0.2+ 150111 807 0.2- 0.4+ 150221 W96 0.2- 0.6+ 150825 474 0.1+ 0.0 150111 W96 0.9- 0.8+ 150318 474 0.3- 0.1+ 150825 474 0.1- 0.1+ 150111 W96 1.1- 0.3- 150318 474 1.2- 0.7+ 150913 474 0.3- 0.1+ 150111 W96 0.3- 0.0 150318 474 0.9- 0.3+ 150913 474 0.2- 0.3- 150112 K92 0.2- 0.1- 150318 474 0.5- 0.1+ 150913 474 0.0 0.1+ 150112 K92 0.1- 0.1+ 150325 Q62 0.6+ 0.1+ 150112 K92 0.2- 0.1+ 150325 Q62 0.8+ 0.3+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2015 Oct. 12

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