Nakano Note (Nakano wa Kangaeru noda) NK 4146 C/2019 S4 (Lemmon)

The following improved orbital elements, by S. Nakano, are from 103 observations 2019 Sept. 17 to 2020 July 9. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.43 arc second. See the previous orbits in CBET 4738, HICQ 2020, NK 4059 and NK 4091. Epoch = 2020 Apr. 21.0 TT T = 2020 Apr. 7.94143 +/- 0.00142 (m.e.) TT Peri. = 71.35541 +/- 0.00030 Node = 63.16896 +/- 0.00003 (2000.0) Inc. = 92.02499 +/- 0.00003 q = 3.4417246 +/- 0.0000052 AU e = 0.9857289 +/- 0.0000051 1/a = +0.0041465 +/- 0.0000015 1/AU origin = +0.004086 (Q= 8) future = +0.004193 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2019/ 191003 I52 0.1+ 0.7- 200220 461 0.3+ 0.3+ 190917 G96 0.0 0.5- 191003 I52 0.1- 1.2- 200228 H06 0.4+ 0.1- 190917 G96 0.6- 0.8- 191024 568 0.0 0.2+ 200228 H06 0.2+ 0.2- 190917 G96 0.5- 0.5- 191024 568 0.0 0.3+ 200401 K77 0.2+ 0.2- 190917 G96 0.1- 0.3- 191024 568 0.0 0.2+ 200401 K77 0.3+ 0.4+ 190917 G96 0.1- 0.1- 191027 C95 0.0 0.0 200529 H06 0.5+ 0.2- 190917 G96 0.4+ 0.2+ 191027 C95 0.7- 0.5+ 200529 H06 0.4+ 0.0 190917 G96 0.4+ 0.5+ 191027 C95 0.3+ 0.1- 200529 H06 0.6+ 0.1- 190917 G96 0.6+ 1.4+ 191030 Q11 0.0 0.3- 200614 T08 0.4- 0.2+ 190918 G96 0.7- 0.5- 191030 Q11 0.0 0.1+ 200614 T08 0.4+ 0.3- 190918 G96 0.7- 0.1- 191030 Q11 0.1+ 0.1+ 200614 T08 0.3+ 0.0 190918 G96 0.1+ 0.5- 191102 H06 0.1+ 0.5+ 200614 T08 0.8+ 0.4+ 190918 G96 0.6- 0.8- 191102 H06 0.3- 0.4+ 200618 T08 0.3+ 0.6- 190919 G96 0.2+ 0.0 191124 461 0.2- 0.2+ 200618 T08 0.1+ 1.1- 190919 G96 0.1- 0.1+ 191124 461 0.2- 0.2+ 200618 T08 0.5+ 0.4+ 190919 G96 0.0 0.3- 191124 461 0.2- 0.1+ 200618 T08 0.2- 0.6- 190920 L01 0.6- 0.1- 191124 461 0.3- 0.2+ 200618 T08 0.5- 1.6+ 190920 L01 0.6- 0.3- 191124 461 0.1- 0.3+ 200618 T08 0.4+ 0.0 190920 L01 0.2- 0.0 191124 461 0.1- 0.3+ 200628 T05 0.2+ 0.5+ 190927 K88 0.2- 0.1+ 191217 H06 0.1- 0.2+ 200628 T05 0.2+ 0.4- 190927 K88 0.1+ 0.1- 191217 H06 0.1+ 0.3+ 200628 T05 0.9+ 0.5- 190927 K88 0.1- 0.0 191226 461 0.2+ 0.1+ 200628 T05 0.2- 0.6+ 190927 H06 0.5- 0.9+ 191226 461 0.4+ 0.1+ 200630 215 (4.9- 12.3+) 190927 H06 0.1+ 0.8+ 191226 461 0.3+ 0.0 200630 215 (2.6- 12.8+) 190930 I52 0.4- 0.4- 191229 215 0.1+ 0.2+ 200630 215 (1.2- 13.4+) 190930 I52 0.1- 0.4- 191229 215 0.8+ 0.5- 200708 T08 0.1- 0.1- 190930 I52 0.2+ 0.3- 191229 215 0.3- 0.7+ 200708 T08 0.3+ 0.4+ 191002 711 0.2- 0.2- 191231 461 0.3- 0.4+ 200708 T08 0.1- 0.2- 191002 711 0.1+ 0.5- 191231 461 0.0 0.4+ 200708 T08 0.6+ 0.7- 191002 711 0.0 0.5- 2020/ 200708 T08 0.1- 0.3+ 191002 I52 0.1+ 0.1- 200101 461 0.0 0.3+ 200708 T08 0.4- 0.7+ 191002 I52 0.2+ 0.0 200101 461 0.1- 0.4+ 200708 T08 0.4+ 0.3+ 191002 I52 0.1+ 0.8- 200101 L27 0.7+ 0.3- 200708 T08 0.2- 0.5- 191002 I52 0.1+ 0.7- 200101 L27 1.0+ 1.3- 200709 F51 0.0 0.1- 191003 I52 0.1- 1.0- 200220 461 0.1+ 0.3+ 200709 F51 0.0 0.3- 191003 I52 0.5+ 0.9- 200220 461 0.2+ 0.3+ 200709 F51 0.1- 0.0 ( ) -------- Rejected Obs.

Associate of the CBAT Revised orbit Syuichi Nakano 2020 July 11

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