Nakano Note (Nakano wa Kangaeru noda) NK 3088 P/2015 X6 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 36 observations 2015 Dec. 7 to 2016 Feb. 1. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.38 arc second. Epoch = 2016 Apr. 2.0 TT T = 2016 Mar. 18.69524 +/- 0.03517 (m.e.) TT Peri. = 329.03509 +/- 0.01316 Node = 107.11635 +/- 0.00235 (2000.0) Inc. = 4.55792 +/- 0.00015 q = 2.2872422 +/- 0.0000230 AU e = 0.1695041 +/- 0.0001310 a = 2.7540680 +/- 0.0001580 AU n' = 0.21564633 +/- 0.00001856 P = 4.570 +/- 0.0003934 years (+/- 0.14 day) The predicted orbit for the 2020 return is as follows: T = 2020 Oct. 17.02435 TT Epoch = 2020 Sept.28.0 TT Peri. = 329.87708 e = 0.1724940 Node = 106.95209 (2000.0) a = 2.7529564 AU Inc. = 4.56454 n'= 0.21577697 q = 2.2780880 AU P = 4.568 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2015/ 151209 291 0.5+ 0.6+ 151217 568 0.0 0.0 151207 F51 0.1+ 0.1- 151210 Q62 0.1- 1.1+ 151217 568 0.0 0.1+ 151207 F51 0.2+ 0.1- 151210 Q62 0.2- 0.9+ 151217 568 0.1+ 0.1+ 151207 F51 0.3- 0.1- 151210 Q62 0.0 1.0+ 151217 568 0.0 0.1+ 151208 H01 0.4+ 0.2+ 151214 691 0.8+ 0.8+ 151217 568 0.2+ 0.2+ 151208 H01 0.0 0.1+ 151214 691 0.4+ 0.1+ 2016/ 151208 H01 0.0 0.1+ 151214 691 0.6+ 0.4+ 160101 568 0.1- 0.0 151208 H01 0.1- 0.2+ 151214 K51 0.3+ 0.3+ 160101 568 0.1- 0.0 151208 568 0.2- 0.3- 151214 K51 0.4+ 0.3+ 160101 568 0.3- 0.0 151208 568 0.2- 0.1- 151214 K51 0.4+ 0.4+ 160201 568 0.1- 0.0 151208 568 0.1- 0.3- 151215 291 1.2+ 0.6+ 160201 568 0.1+ 0.1- 151209 291 0.6+ 0.7+ 151215 291 0.1+ 0.0 160201 568 0.2+ 0.0 151209 291 1.0+ 0.2- 151217 568 0.1- 0.0 ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2016 Apr. 1

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