Nakano Note (Nakano wa Kangaeru noda) NK 3600 C/2017 K5 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 25 observations 2017 May 27 to 2018 May 12. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.35 arc second. The comet will pass 2.62 AU from Jupiter on 2020 Apr. 25 and 3.31 AU from Saturn on 2020 May 21 UT. This orbit depends on one night observations on 2018 May 12. See the previous orbit in NK 3468 (= HICQ 2018). Epoch = 2020 Mar. 12.0 TT T = 2020 Mar. 24.34771 +/- 0.02762 (m.e.) TT Peri. = 171.84422 +/- 0.00414 Node = 102.37554 +/- 0.00036 (2000.0) Inc. = 82.26269 +/- 0.00019 q = 7.6782335 +/- 0.0003429 AU e = 1.0060482 +/- 0.0000819 1/a = -0.0007877 +/- 0.0000107 1/AU origin = +0.000051 (Q= 7) future = -0.000207 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2017/ 170529 U69 0.0 0.3+ 170721 461 0.5+ 0.2- 170527 F51 0.0 0.2+ 170530 734 0.8- 0.5- 170721 461 0.2- 0.5+ 170527 F51 0.1+ 0.1- 170530 734 0.2- 0.3+ 170722 461 0.7+ 0.1- 170527 F51 0.1+ 0.3- 170530 291 0.4- 0.8+ 170722 461 0.0 0.1+ 170527 F51 0.1- 0.1- 170530 291 0.4- 0.8+ 171014 461 0.3+ 0.1+ 170528 568 0.0 0.1- 170530 291 0.3- 0.8+ 171014 461 0.5- 0.6- 170528 568 0.0 0.0 170601 H21 0.1+ 0.1+ 2018/ 170528 568 0.0 0.0 170601 H21 0.0 0.3+ 180512 H06 0.2+ 0.1+ 170529 U69 0.0 0.6+ 170601 H21 0.3- 0.4+ 180512 H06 0.2- 0.0 ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2018 June 10

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