Nakano Note (Nakano wa Kangaeru noda) NK 4221 C/2020 K4 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 48 observations 2020 May 20 to Sept. 14. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.18 arc second. The comet has passed 3.34 AU from Jupiter on 2020 May 30 UT. Epoch = 2020 Mar. 12.0 TT T = 2020 Mar. 6.50954 +/- 0.00122 (m.e.) TT Peri. = 310.29589 +/- 0.00057 Node = 264.10413 +/- 0.00001 (2000.0) Inc. = 125.91687 +/- 0.00017 q = 1.7727848 +/- 0.0000070 AU e = 0.9611502 +/- 0.0000225 1/a = +0.0219146 +/- 0.0000127 1/AU a = 45.63 AU P = 308.2 years origin = +0.022140 (Q= 7) future = +0.022203 The following residuals in seconds of arc are from the above orbital elements (We need one more figure (0".01) on residual list): Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 200524 568 0.1+ 0.0 200622 F51 0.2- 0.2+ 200520 F51 0.1+ 0.0 200524 568 0.1- 0.0 200622 F51 0.0 0.0 200520 F51 0.0 0.1- 200524 568 0.2+ 0.0 200623 474 0.7+ 0.3- 200520 F51 0.5- 0.0 200524 568 0.2+ 0.1- 200623 474 0.0 0.4- 200521 568 0.1+ 0.1- 200527 Q62 0.1- 0.2+ 200623 474 0.0 0.0 200521 568 0.0 0.0 200527 Q62 0.3+ 0.3+ 200623 474 0.0 0.2- 200521 568 0.0 0.0 200527 Q62 0.1- 0.3+ 200623 474 0.1+ 0.1+ 200521 568 0.0 0.1+ 200620 568 0.0 0.1- 200627 Q62 0.2+ 0.3- 200522 568 0.0 0.0 200620 568 0.1- 0.1+ 200627 Q62 0.3+ 0.3- 200522 568 0.0 0.0 200620 568 0.0 0.0 200627 Q62 0.1+ 0.3- 200522 568 0.0 0.0 200620 568 0.0 0.0 200718 568 0.0 0.2- 200523 568 0.0 0.0 200620 474 0.2+ 0.5- 200718 568 0.0 0.2- 200523 568 0.0 0.1+ 200620 474 0.5- 0.3- 200914 568 0.0 0.2+ 200523 568 0.0 0.1+ 200620 474 0.0 0.1- 200914 568 0.1+ 0.0 200524 568 0.0 0.0 200620 474 0.2+ 0.2- 200914 568 0.0 0.1+ 200524 568 0.2+ 0.1- 200620 474 0.2+ 0.1- 200524 568 0.2- 0.0 200622 F51 0.1+ 0.1+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2020 Oct. 4

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