Nakano Note (Nakano wa Kangaeru noda) NK 3874 C/2016 Q2 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 111 observations 2016 Aug. 26 to 2019 Aug. 22. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.57 arc second. See the previous orbits in NK 3450, NK 3671 and NK 3693 (= HICQ 2019). Epoch = 2021 May 26.0 TT T = 2021 May 11.88998 +/- 0.00585 (m.e.) TT Peri. = 84.52925 +/- 0.00056 Node = 322.29574 +/- 0.00002 (2000.0) Inc. = 109.38829 +/- 0.00005 q = 7.0818387 +/- 0.0000470 AU e = 1.0006783 +/- 0.0000144 1/a = -0.0000958 +/- 0.0000020 1/AU origin = +0.000120 (Q= 9) future = +0.000147 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2016/ 170723 461 0.3- 1.0+ 180804 Q62 1.0+ 0.2+ 160826 F51 0.1+ 0.3+ 170723 461 0.0 0.6+ 180804 461 0.2+ 0.1+ 160826 F51 0.1+ 0.1- 170729 461 0.5- 0.2+ 180804 461 0.6- 0.2- 160826 F51 0.3+ 0.2+ 170729 461 0.6- 0.1- 180811 215 1.2- 0.6+ 160827 291 0.0 1.0+ 170823 F51 0.0 0.0 180811 215 1.1- 1.7+ 160827 291 0.4- 0.6+ 170823 F51 0.0 0.1- 180811 215 (1.6- 2.1+) 160827 291 0.3- 0.7+ 170823 F51 0.1- 0.2- 180817 461 0.1- 0.0 160827 Q62 0.7- 0.7+ 170823 F51 0.2- 0.1- 180817 461 0.0 0.1+ 160827 Q62 0.6- 0.7+ 170823 461 0.4+ 0.7+ 180818 461 0.3- 0.5+ 160827 Q62 0.7- 0.9+ 170823 461 0.3- 1.3+ 180818 461 0.2- 0.7+ 160827 Q62 0.5- 0.7+ 170824 F51 0.0 0.0 180819 461 0.3+ 0.7+ 160828 H21 0.1- 0.1- 170824 F51 0.0 0.0 180819 461 0.3- 0.1+ 160828 H21 0.2- 0.1+ 170824 F51 0.2+ 0.2- 181004 461 0.0 0.5+ 160828 H21 0.4- 0.2+ 170824 F51 0.1- 0.0 181004 461 0.2- 0.0 160829 291 0.6- 1.6+ 170824 F51 0.1- 0.0 181005 461 0.2+ 0.3+ 160829 291 (0.4- 2.0+) 170824 F51 0.0 0.3- 181005 461 0.0 0.0 160830 291 1.2- 1.6+ 170824 F51 0.0 0.3- 181005 461 0.3+ 0.1+ 160830 291 0.9- 1.6+ 170824 F51 0.1- 0.1- 181007 461 0.2+ 0.2+ 160830 A71 0.1- 0.6+ 170825 A71 0.5- 1.5+ 181007 461 0.1- 0.2- 160830 A71 0.0 1.6+ 170825 A71 0.8+ 1.8+ 2019/ 160907 215 1.8- 0.2+ 170913 568 0.0 0.3- 190608 461 0.5+ 0.6- 160907 215 1.8- 0.6+ 170913 568 0.1+ 0.3- 190608 461 0.5+ 0.1+ 160907 215 (2.0- 0.3+) 170914 Q62 0.5- 0.4+ 190608 461 1.0+ 0.1- 160923 Q62 1.1+ 1.7+ 170914 Q62 0.1- 0.7+ 190609 461 0.2+ 0.1- 160923 Q62 1.3+ 1.5+ 170914 Q62 0.3- 1.0+ 190609 461 0.0 0.0 160923 Q62 1.4+ 1.5+ 170916 F51 0.0 0.0 190609 461 0.0 0.2+ 160923 Q62 0.6+ 1.1+ 170916 F51 0.2- 0.1+ 190609 461 0.2+ 0.2+ 160924 N50 0.2+ 0.1+ 170916 F51 0.2- 0.1+ 190801 461 0.0 0.6+ 160924 N50 0.0 0.3- 170916 F51 0.1- 0.0 190801 461 0.0 0.2+ 160924 N50 0.2+ 0.5- 171010 F51 0.1+ 0.0 190801 461 0.2- 0.1- 161001 568 0.2+ 0.3- 171010 F51 0.1- 0.0 190813 I41 0.0 0.7- 161001 568 0.1+ 0.1- 171010 F51 0.2+ 0.3+ 190813 I41 0.2+ 0.3- 161001 568 0.1+ 0.2- 171010 F51 0.2- 0.4- 190813 I41 0.1+ 0.2- 161003 568 0.1+ 0.2- 171014 461 0.1+ 0.0 190813 I41 0.6+ 0.1- 161003 568 0.2+ 0.2- 171014 461 0.2- 0.4+ 190813 I41 0.3+ 0.5- 161029 568 0.1- 0.2+ 2018/ 190822 C95 0.1+ 0.6+ 161029 568 0.0 0.1+ 180803 461 0.2+ 0.1+ 190822 C95 0.1- 0.0 2017/ 180803 461 0.6- 0.7+ 190822 C95 0.4- 0.1+ 170425 568 0.1+ 0.3- 180804 Q62 1.1+ 0.1- 170425 568 0.0 0.1- 180804 Q62 0.7+ 0.1+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2019 Sept. 4

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