Nakano Note (Nakano wa Kangaeru noda) NK 4365 C/2021 A1 (Leonard)

The following improved orbital elements, by S. Nakano, are from 97 observations 2020 Apr. 11 to 2021 Jan. 9. 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 an orbit in CBET 4907 (same orbit). Epoch = 2022 Jan. 21.0 TT T = 2022 Jan. 3.32514 +/- 0.01157 (m.e.) TT Peri. = 225.09589 +/- 0.00087 Node = 255.89490 +/- 0.00062 (2000.0) Inc. = 132.68625 +/- 0.00007 q = 0.6152381 +/- 0.0000061 AU e = 0.9999814 +/- 0.0000137 1/a = +0.0000302 +/- 0.0000222 1/AU origin = +0.000575 (Q= 7) future = -0.000030 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2020/ 201122 K88 0.1+ 0.2+ 210105 I52 0.4+ 0.2- 200411 G96 0.3- 0.3- 201122 K88 0.6+ 0.2- 210105 I52 0.2+ 0.2+ 200411 G96 0.0 0.2- 201122 K88 0.8+ 0.5+ 210106 I81 0.1- 0.1+ 200411 G96 0.5- 0.4- 201124 K88 0.2+ 0.1- 210106 I81 0.4+ 0.2- 200411 G96 0.1- 0.7- 201124 K88 0.0 0.5- 210106 I81 0.4+ 0.1- 200430 F51 0.3+ 0.0 201124 K88 0.2+ 0.9+ 210106 I81 0.5- 0.0 200430 F51 0.4- 0.0 201220 703 0.2+ 1.3- 210106 I81 0.0 0.3+ 200430 F51 0.4- 0.0 201220 703 0.9+ 1.0- 210106 I81 0.1- 0.1- 200503 F52 0.4+ 0.3+ 201220 703 0.7- 1.2+ 210106 H06 1.1+ 0.7- 200503 F52 0.0 0.4- 2021/ 210106 H06 1.0+ 0.2- 200503 F52 0.3- 0.4- 210102 703 1.6- 1.8+ 210106 H06 0.3- 0.5+ 200504 F51 0.5+ 0.1- 210102 703 1.0- 1.2- 210106 H06 0.1+ 0.4+ 200504 F51 0.1+ 0.0 210102 703 1.6- 0.1+ 210107 L06 0.8+ 0.4- 200504 F51 0.3+ 0.5- 210103 G96 0.2- 0.1+ 210107 L06 0.8+ 0.3- 200528 F51 0.1- 0.1+ 210103 G96 0.1- 0.1- 210107 L06 0.7+ 0.1- 200528 F51 0.1- 0.1+ 210103 G96 0.1+ 0.1+ 210107 Q21 0.2+ 0.1+ 200528 F51 0.4- 0.2+ 210103 G96 0.1+ 0.1- 210107 Q21 1.1+ 0.7+ 200528 F51 0.1- 0.1- 210104 I52 1.1- 0.5- 210108 I81 0.2- 0.7- 200529 F51 0.0 0.1+ 210104 I52 0.7- 0.3+ 210108 I81 0.2+ 0.1- 200529 F51 0.0 0.2+ 210104 I52 0.4- 0.4+ 210108 I81 0.1- 0.5- 200529 F51 0.4+ 0.1+ 210104 I52 0.3+ 0.6- 210108 I81 0.1- 0.1+ 200529 F51 0.2- 0.3+ 210104 V06 0.1- 0.3- 210108 I81 0.0 0.3- 200531 F52 0.1- 0.2+ 210104 V06 0.0 0.3- 210108 T08 0.3- 0.2- 200608 F52 0.1- 0.1- 210104 V06 0.2+ 0.1+ 210108 T08 0.3- 0.5- 200610 F51 0.0 0.0 210104 F65 0.5+ 0.2+ 210108 T08 0.8- 0.1+ 200801 F51 0.0 0.5- 210104 F65 0.6+ 0.3+ 210108 T08 0.8- 0.1+ 200801 F51 0.0 0.5+ 210104 F65 0.5+ 0.4+ 210109 I81 0.7- 0.3+ 200801 F51 0.3- 0.1+ 210104 F65 0.7+ 0.6+ 210109 I81 0.6- 0.1+ 200801 F51 0.3+ 0.3+ 210105 L01 0.2+ 0.2- 210109 I81 0.4- 0.4- 201121 G96 0.0 0.1+ 210105 L01 0.4- 0.0 210109 I81 0.1- 0.9+ 201121 G96 0.1- 0.1- 210105 L01 0.5- 0.0 210109 595 0.7+ 0.0 201121 G96 0.5+ 0.1- 210105 I52 0.1- 1.1+ 210109 595 0.2+ 0.5- 201121 G96 0.0 0.6- 210105 I52 0.5- 0.5- 210109 595 0.1+ 0.3- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 Jan. 10

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