Nakano Note (Nakano wa Kangaeru noda) NK 5430 C/2025 A6 (Lemmon)
The following improved orbital elements, by S. Nakano, are from 117 observations 2024 Nov. 12 to 2025 Aug. 14. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.40 arc second. Residuals from an orbit CBET 5508 were -3" mainly for Right Ascension. The comet has passed 2.33 AU from Jupiter on 2025 Apr. 16 and will pass 0.60 AU from the Earth on 2025 Oct. 21 UT Epoch = 2025 Nov. 21.0 TT T = 2025 Nov. 8.53978 +/- 0.00180 (m.e.) TT Peri. = 132.97025 +/- 0.00023 Node = 108.09813 +/- 0.00004 (2000.0) Inc. = 143.66289 +/- 0.00021 q = 0.5298877 +/- 0.0000058 AU e = 0.9956364 +/- 0.0000035 1/a = +0.0082350 +/- 0.0000066 1/AU origin = +0.008193 (Q= 7) future = +0.009092 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2024/ 250109 J13 0.2+ 0.4+ 250213 Z84 0.1- 0.0 241112 F52 0.1+ 0.4+ 250117 204 0.5+ 0.5+ 250217 I52 0.1+ 0.2+ 241112 F52 0.4+ 0.3- 250118 204 0.2+ 0.0 250217 I52 0.3+ 0.6- 241112 F52 0.0 0.4+ 250118 L06 0.5- 0.5+ 250217 I52 0.8+ 0.4- 241128 F51 0.3- 0.3- 250118 L06 0.3- 0.1+ 250218 L38 1.0+ 0.1+ 241202 F52 0.4- 0.4- 250119 B74 0.3- 0.0 250218 L38 0.4+ 0.3+ 241202 F52 0.0 0.5+ 250119 B74 0.2- 0.3- 250219 G00 0.3+ 0.5+ 241202 F52 0.2+ 0.0 250119 B74 0.5- 0.3- 250219 G00 0.1- 0.1+ 241206 F52 0.1+ 0.2+ 250119 K93 0.3+ 0.3- 250220 V06 0.0 0.0 241206 F52 0.5- 0.1+ 250119 K93 0.0 0.1+ 250220 V06 0.1- 0.0 241206 F51 0.7+ 0.1+ 250120 F52 0.1+ 0.0 250220 V06 0.2- 0.1- 241222 F52 0.1- 0.0 250120 691 0.0 0.5- 250220 V06 0.2- 0.0 241222 F52 0.1- 0.1+ 250120 691 0.1- 0.0 250221 T14 0.4- 0.0 241222 F52 0.3- 0.0 250120 F52 0.1- 0.2+ 250221 T14 0.4- 0.0 241222 F52 0.3- 0.1+ 250120 691 0.0 0.4- 250221 T14 0.4- 0.0 241223 F51 0.1- 0.0 250120 F52 0.3- 0.0 250222 W62 0.1- 0.2+ 241223 F51 0.2+ 0.0 250124 673 0.9- 0.1+ 250222 W62 0.3- 0.2- 241223 F51 0.0 0.1- 250124 673 0.1- 0.1- 250226 W62 0.4- 0.1- 241230 F51 0.1+ 0.0 250128 Q63 0.2+ 0.0 250226 W62 0.5- 0.1+ 241230 F51 0.0 0.0 250128 Q63 0.3+ 0.0 250226 W62 0.4- 0.0 241230 F51 0.0 0.2- 250130 673 0.3- 0.4+ 250322 Z21 0.6- 0.5- 2025/ 250130 673 0.1- 0.2+ 250322 Z21 0.7- 0.7+ 250103 G96 0.0 0.4- 250131 673 0.2+ 0.4+ 250322 Z21 1.4+ 0.2- 250103 G96 0.1- 0.6- 250131 673 0.5- 0.1- 250327 Y71 1.3- 0.6- 250103 G96 0.5+ 0.0 250131 L38 0.6- 0.2- 250327 Y71 0.4- 0.3+ 250103 G96 0.4- 0.0 250131 L38 0.5- 0.6+ 250327 Y71 0.8- 0.5- 250103 I52 0.5+ 0.3- 250201 M45 0.4- 0.3- 250809 213 (7.6- 4.6+) 250103 I52 0.6+ 0.1- 250201 L38 0.2- 0.0 250809 213 0.2+ 0.5+ 250103 I52 0.1- 0.2+ 250201 L38 0.4- 0.2+ 250809 213 0.8+ 0.8- 250103 I52 0.0 0.2- 250201 M45 0.1+ 0.4+ 250809 N86 (4.2- 1.9+) 250104 I52 0.3+ 0.1+ 250201 L38 0.0 0.0 250809 N86 (4.5- 0.5+) 250104 I52 0.6- 0.1- 250201 M45 0.0 0.3- 250809 N86 (3.8- 1.0+) 250104 I52 0.8+ 0.3- 250201 I93 0.1- 0.4- 250811 U94 0.9- 0.3+ 250105 F51 0.1- 0.0 250201 I93 0.2- 0.0 250811 U94 0.9- 0.5+ 250105 F51 0.1- 0.1+ 250201 I93 0.2+ 0.2+ 250812 U94 1.0- 0.5+ 250105 F51 0.1- 0.3+ 250206 I52 0.7+ 0.0 250812 U94 1.3- 0.3+ 250105 F51 0.1- 0.2- 250206 I52 0.3+ 0.4+ 250812 U94 1.4- 0.3+ 250106 T12 0.0 0.0 250206 I52 0.2- 0.0 250812 U94 1.3- 0.4+ 250106 T12 0.0 0.0 250206 I52 0.7+ 0.3+ 250814 349 0.8- 0.4+ 250106 T12 0.3- 0.0 250213 Z84 0.2+ 0.2- 250814 349 0.9- 0.4+ 250109 J13 0.2- 0.2+ 250213 Z84 0.0 0.1- 250814 349 0.7- 0.7+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2025 Aug. 20