Nakano Note (Nakano wa Kangaeru noda) NK 5393 P/PANSTARRS (2019 A8 = 2025 B3)
The following improved orbital elements, by S. Nakano, are from 66 observations 2018 to 2025. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.52 arc second. Because comet was observed in short arc (55 days) on the 2018 return and orbit was changed due to close approach to Jupiter (0.26 AU) on 2021, the delta-T correction was large +49.2 days for the prediction in NK 5033 (= CH 2025). The comet has passed 0.27 AU and 0.26 AU from Jupiter on 2009 Nov. 26 and 2021 Nov. 1 UT, respectively. The recovery observations 2025 Jan.-Feb. were found by T. Kobayashi. See the previous orbit in NK 5033 an CBET 5516 (same orbit). Epoch = 2025 Mar. 26.0 TT T = 2025 Mar. 31.93143 +/- 0.00296 (m.e.) TT Peri. = 46.68240 +/- 0.00182 Node = 111.53024 +/- 0.00044 (2000.0) Inc. = 2.30150 +/- 0.00004 q = 2.1317498 +/- 0.0000451 AU e = 0.3758977 +/- 0.0000088 a = 3.4157055 +/- 0.0000870 AU n' = 0.15612895 +/- 0.00000596 P = 6.313 +/- 0.0002411 years (+/- 0.09 day) T = 2018 Aug. 30.74303 TT Epoch = 2018 Aug. 30.0 TT Peri. = 20.40194 e = 0.4274762 Node = 127.89504 (2000.0) a = 3.2713956 AU Inc. = 2.96678 n'= 0.16657295 q = 1.8729519 AU P = 5.917 years The predicted orbit for the 2031 return is as follows: T = 2031 July 29.36661 TT Epoch = 2031 Aug. 2.0 TT Peri. = 46.87868 e = 0.3749327 Node = 111.50477 (2000.0) a = 3.4178624 AU Inc. = 2.30121 n'= 0.15598118 q = 2.1363939 AU P = 6.319 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2018/ 190119 695 0.6+ 1.3+ 250202 G96 0.9- 0.5- 181216 I41 0.5- 0.2+ 190119 695 0.2- 0.5+ 250202 G96 0.6+ 0.1+ 181216 I41 0.7- 0.2- 190119 695 0.5- 0.1+ 250205 G96 0.0 0.2+ 181216 I41 1.0- 0.1- 190124 I52 1.3- 1.2- 250205 G96 0.5+ 0.2+ 181216 I41 0.8- 0.4- 190124 291 0.5- 0.3- 250205 G96 0.0 0.0 181230 I41 0.6- 0.0 190124 I52 0.8- 0.2- 250205 F52 0.1- 0.0 181230 I41 0.8- 0.1- 190124 I52 0.2- 0.9- 250205 F52 0.1+ 0.1+ 181230 I41 0.5- 0.1- 190124 I52 1.1- 1.4- 250205 F52 0.3+ 0.0 181230 I41 0.7- 1.1+ 190124 291 0.4- 0.2- 250205 F52 0.0 0.1+ 181230 I41 0.0 0.2- 190202 711 0.0 0.4+ 250216 Y71 0.5- 0.3- 2019/ 190202 711 0.6- 0.1- 250216 Y71 0.2- 0.2- 190111 F51 0.1+ 0.1- 190202 711 0.0 0.0 250216 Y71 0.7+ 0.9- 190111 F51 0.2+ 0.1- 190209 Q62 1.2- 0.6+ 250222 G00 0.1+ 0.2- 190111 F51 0.1- 0.2+ 190209 Q62 1.2- 0.8+ 250222 G00 0.2+ 0.4+ 190111 F51 0.0 0.1+ 190404 T05(31.8- 23.6-) 250222 G00 0.8+ 0.5+ 190112 568 0.3+ 0.0 190404 T05(30.8- 23.0-) 250222 Y71 0.2+ 1.1+ 190112 568 0.3+ 0.0 190404 T05(30.6- 22.5-) 250222 Y71 0.1- 0.3+ 190112 568 0.1+ 0.0 190404 T05(30.7- 21.7-) 250222 Y71 0.6+ 0.2+ 190114 568 0.2+ 0.1- 2025/ 250225 F52 0.5- 0.1- 190114 568 0.2+ 0.0 250124 G96 0.0 0.0 250225 F52 0.2+ 0.1- 190114 568 0.2+ 0.0 250124 G96 0.5- 0.2- 250225 F52 0.1+ 0.1+ 190117 I52 1.5- 0.4+ 250124 G96 0.1- 0.1+ 250225 Y71 0.1- 1.2+ 190117 I52 1.0- 0.5+ 250124 G96 0.1+ 0.0 250225 Y71 0.3- 0.1- 190117 I52 0.0 0.6- 250202 G96 0.4+ 0.5- 250225 Y71 0.3- 0.1+ 190117 I52 (2.0- 0.7+) 250202 G96 0.3- 0.2+ ( ) -------- Rejected Obs.
Associate of the CBAT Late edtion Syuichi Nakano 2025 Feb. 28