OAA computing section circular NK 3468 C/2017 K5 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 23 observations 2017 May 27 to Oct. 14. 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 for 2017 Oct. 14. Epoch = 2020 Mar. 12.0 TT T = 2020 Mar. 24.32880 +/- 0.05780 (m.e.) TT Peri. = 171.85582 +/- 0.00913 Node = 102.37481 +/- 0.00183 (2000.0) Inc. = 82.26313 +/- 0.00093 q = 7.6770399 +/- 0.0008737 AU e = 1.0065267 +/- 0.0003140 1/a = -0.0008502 +/- 0.0000409 1/AU origin = -0.000011 (Q= 6) future = -0.000269 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 0.6+ 170601 H21 0.0 0.3+ 170527 F51 0.1+ 0.2+ 170529 U69 0.0 0.3+ 170601 H21 0.3- 0.4+ 170527 F51 0.1+ 0.1- 170530 734 0.8- 0.5- 170721 461 0.3+ 0.3- 170527 F51 0.1+ 0.3- 170530 734 0.3- 0.3+ 170721 461 0.4- 0.3+ 170527 F51 0.1- 0.1- 170530 291 0.4- 0.8+ 170722 461 0.5+ 0.2- 170528 568 0.0 0.1- 170530 291 0.4- 0.8+ 170722 461 0.2- 0.0 170528 568 0.0 0.0 170530 291 0.3- 0.8+ 171014 461 0.4+ 0.4+ 170528 568 0.0 0.0 170601 H21 0.0 0.1+ 171014 461 0.4- 0.4- ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2017 Nov. 11

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