Nakano Note (Nakano wa Kangaeru noda) NK 4300 P/2020 K9 (Lemmon-PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 107 observations 2020 May 22 to Nov. 17. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.48 arc second. See the previous orbits in CBET 4797 and NK 4222. Epoch = 2021 Jan. 26.0 TT T = 2021 Feb. 11.80417 +/- 0.00521 (m.e.) TT Peri. = 196.87360 +/- 0.00143 Node = 166.23960 +/- 0.00008 (2000.0) Inc. = 23.20894 +/- 0.00010 q = 2.8494328 +/- 0.0000141 AU e = 0.3216036 +/- 0.0000076 a = 4.2002477 +/- 0.0000513 AU n' = 0.11449637 +/- 0.00000210 P = 8.608 +/- 0.0001578 years (+/- 0.06 day) The predicted orbit for the 2029 return is as follows: T = 2029 Sept.28.63455 TT Epoch = 2029 Sept.21.0 TT Peri. = 196.91081 e = 0.3200195 Node = 166.23175 (2000.0) a = 4.2154684 AU Inc. = 23.17788 n'= 0.11387682 q = 2.8664364 AU P = 8.655 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 200624 215 0.6- 0.3- 200911 G96 0.2- 0.1+ 200522 G96 0.3+ 0.1- 200624 215 0.5- 0.4- 200911 G96 0.2- 0.2+ 200522 G96 0.0 0.1- 200705 118 1.5- 0.5- 200911 G96 0.2- 0.2+ 200522 G96 0.1+ 0.2+ 200705 118 1.0- 0.0 200911 G96 0.5- 0.1+ 200522 G96 0.0 0.1+ 200718 T08 0.4- 0.1- 200912 F51 0.2+ 0.1+ 200526 F51 0.2+ 0.1+ 200718 T08 0.7- 0.1+ 200912 F51 0.1- 0.1+ 200526 F51 0.3+ 0.1+ 200718 T08 0.2- 0.9- 200912 F51 0.0 0.3+ 200526 F51 0.2+ 0.1+ 200718 T08 (2.3+ 0.3+) 200912 F51 0.0 0.1+ 200529 T05 0.5- 0.3- 200718 T08 0.0 1.0+ 200913 F52 0.2- 0.2- 200529 T05 0.6+ 0.0 200718 T08 (3.4- 0.7-) 200913 F52 0.2+ 0.2- 200529 T05 0.6- 0.2- 200718 T08 0.4- 0.0 200914 130 0.2- 0.4- 200529 T05 1.0- 0.6- 200721 F52 0.1+ 0.0 200914 130 0.4+ 0.8+ 200614 F51 0.1+ 0.0 200721 F52 0.3- 0.2+ 200915 G96 0.6- 0.1+ 200614 F51 0.2+ 0.2- 200721 F52 0.2+ 0.3+ 200915 G96 0.1+ 0.2- 200616 Q62 0.6- 0.2+ 200722 T08 0.6- 1.4- 200915 G96 0.1- 0.4- 200616 Q62 0.5- 0.0 200722 T08 1.1- 0.2+ 200915 G96 0.2- 0.3+ 200616 Q62 0.3- 0.1- 200722 T08 0.9- 0.9- 201018 Q11 0.0 0.2- 200617 568 0.0 0.0 200722 T08 0.3+ 0.3+ 201018 Q11 0.1+ 0.0 200617 568 0.1+ 0.0 200729 A71 1.4+ 0.6- 201019 G96 0.2- 0.4+ 200617 568 0.1+ 0.0 200730 A71 0.0 0.9- 201019 G96 0.2+ 0.3- 200617 T03 0.1+ 0.2- 200811 T08 0.3+ 0.3+ 201019 G96 0.3+ 0.7- 200617 T03 0.6+ 0.3- 200811 T08 0.6+ 0.1- 201019 G96 1.0+ 0.2- 200617 T03 0.2+ 0.1+ 200811 T08 0.9+ 0.5- 201031 A77 1.5+ 0.2+ 200617 T03 0.5+ 0.0 200811 T08 0.2- 0.2- 201031 A77 0.3- 1.2+ 200617 T03 0.1+ 0.1+ 200818 G96 0.4- 0.1+ 201031 A77 0.2+ 0.6- 200617 T03 0.4+ 0.1- 200818 G96 0.6- 0.3- 201107 D29 0.9- 0.7- 200618 858 0.2+ 0.3- 200818 G96 0.2- 0.1- 201107 D29 0.6+ 0.2- 200618 858 0.1- 0.0 200818 G96 0.6- 0.3- 201107 D29 0.7+ 0.3- 200618 858 0.1- 0.1+ 200819 T08 1.0- 0.0 201110 Q11 0.5+ 0.7+ 200619 Q11 0.8+ 0.2- 200819 T08 0.5- 0.4+ 201110 Q11 1.0+ 0.9+ 200619 Q11 0.5+ 0.0 200819 T08 1.1- 0.6- 201114 A77 0.7+ 0.1+ 200620 204 0.3- 0.2- 200819 T08 0.9- 0.3- 201114 A77 1.2+ 0.1+ 200620 204 0.4- 0.1- 200820 K77 (0.6+ 2.1-) 201114 A77 0.6+ 0.0 200620 204 0.4- 0.2+ 200820 K77 1.0- 0.4+ 201117 X03 0.0 1.1- 200620 Q11 0.0 0.5- 200904 F51 0.1- 0.1+ 201117 X03 0.2- 0.3- 200620 Q11 0.1- 0.5- 200904 F51 0.0 0.0 201117 X03 0.7- 1.2+ 200624 215 0.9- 0.1- 200904 F51 0.0 0.1- 201117 X03 0.2- 1.2- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2020 Dec. 8

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