Nakano Note (Nakano wa Kangaeru noda) NK 5634 P/Kowalski (2009 Y2 = Sar2913)
The following improved orbital elements, by S. Nakano, are from 229 observations 2009 to 2026. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.54 arc second. Identification by T. Kobayashi who reported this on 2026 Sept. 16 UT. Residuals for 2026 September observations were +2.87 deg for Right Ascension and -1.37 deg for Declination from the prediction in NK 1991 (= HICQ 2026) with the delta-T correction = -8.8 days. The comet has passed 2.71 AU from Saturn on 2016 Feb. 29 UT. See the previous orbit in NK 1991. Epoch = 2026 Nov. 16.0 TT T = 2026 Dec. 2.06472 +/- 0.00296 (m.e.) TT Peri. = 172.31584 +/- 0.00106 Node = 262.05313 +/- 0.00019 (2000.0) Inc. = 29.98325 +/- 0.00013 q = 2.3701347 +/- 0.0000087 AU e = 0.6371864 +/- 0.0000014 a = 6.5326505 +/- 0.0000348 AU n' = 0.05902961 +/- 0.00000047 P = 16.697 +/- 0.0001333 years (+/- 0.05 day) T = 2010 Mar. 30.70227 TT Epoch = 2010 Mar. 25.0 TT Peri. = 171.96268 e = 0.6401370 Node = 262.12890 (2000.0) a = 6.4999862 AU Inc. = 29.92841 n'= 0.05947513 q = 2.3391043 AU P = 16.572 years The predicted orbit for the 2043 return is as follows: T = 2043 July 11.12251 TT Epoch = 2043 July 10.0 TT Peri. = 172.49459 e = 0.6362470 Node = 261.51525 (2000.0) a = 6.5215883 AU Inc. = 30.07867 n'= 0.05917987 q = 2.3722474 AU P = 16.654 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2009/ 2010/ 100207 704 0.2+ 1.7+ 091220 703 0.5- 0.8+ 100101 213 0.1- 0.7+ 100207 B82 1.0+ 0.3+ 091220 703 1.6+ 1.3- 100101 213 0.4- 0.4+ 100207 204 0.1- 0.5- 091220 703 0.4- 0.1- 100103 215 0.1- 0.5- 100207 B82 0.2+ 0.2+ 091220 703 0.2+ 1.2+ 100103 215 0.3- 0.4- 100207 B82 0.1- 0.0 091220 703 0.8+ 0.6+ 100103 215 0.4- 0.4- 100207 204 0.3+ 0.1+ 091220 703 0.6+ 0.7+ 100104 C10 0.2- 0.3+ 100214 703 0.4+ 1.1+ 091220 703 1.1- 0.6+ 100104 C10 0.2- 0.0 100214 703 1.7- 1.1- 091220 703 0.9+ 0.5+ 100104 C10 0.5- 0.1+ 100214 703 1.3+ 0.2+ 091220 H01 0.2- 0.2- 100104 C10 0.8- 0.3+ 100214 G96 0.3+ 0.4- 091220 H01 0.1- 0.2- 100104 C10 0.1- 0.4+ 100214 703 0.6+ 0.6+ 091220 G96 0.5+ 0.2+ 100104 C10 0.2- 0.2- 100214 G96 0.5+ 0.5- 091220 G96 0.1+ 0.1+ 100104 C10 0.1- 0.3+ 100214 G96 1.1+ 0.3- 091220 G96 0.0 0.7+ 100104 C10 0.3+ 0.3+ 100214 G96 0.9+ 0.2- 091220 G96 0.1+ 0.4+ 100106 704 0.2+ 0.8+ 100216 B82 (5.3- 0.1-) 091220 G96 0.2- 0.1- 100106 704 0.3+ 1.3+ 100305 A77 (2.6- 1.5+) 091220 G96 0.2- 0.0 100106 704 0.2- 0.6+ 100305 A77 0.0 1.6- 091220 H01 0.1- 0.0 100106 704 0.8+ 0.0 100305 A77 1.7+ 0.4+ 091220 G96 0.0 0.0 100106 A77 0.5- 0.2+ 100402 215 (1.1+ 4.9-) 091220 G96 0.4- 0.3- 100106 A77 1.1+ 0.1- 100402 215 (2.2+ 3.1-) 091220 H01 0.1- 0.1- 100106 A77 0.2+ 0.3+ 100402 215 (3.1+ 3.2-) 091220 H01 0.2- 0.1- 100107 372 1.0- 0.2+ 2026/ 091220 G96 1.0- 0.2- 100107 372 1.3- 0.1+ 260908 I41 0.4- 0.0 091220 G96 0.4- 0.1+ 100109 372 0.1+ 0.1- 260909 I41 0.6+ 0.4+ 091220 G96 1.1- 0.2- 100109 372 1.1+ 0.8+ 260915 K88 0.6+ 0.6+ 091220 G96 0.4- 0.1- 100109 372 1.1- 0.5+ 260915 K88 0.5+ 0.4+ 091220 900 0.6- 0.5- 100110 A77 0.0 0.0 260915 K88 0.1- 0.4- 091220 300 0.9+ 0.2+ 100110 A77 0.5+ 1.0+ 260915 126 0.3- 0.3+ 091220 300 0.7+ 0.2+ 100110 A77 0.3+ 0.5+ 260915 126 0.3- 0.5- 091220 900 0.5+ 0.9+ 100113 C51 0.0 0.6+ 260915 J87 0.2+ 0.1- 091220 900 0.0 0.0 100113 C51 0.1- 1.1+ 260915 104 0.1- 0.9+ 091220 300 1.0+ 0.5+ 100113 C51 0.6- 0.1- 260915 J87 0.4- 0.9+ 091220 300 0.8+ 0.1- 100113 C51 0.2- 0.0 260915 104 0.1+ 0.0 091220 J95 0.4+ 0.1+ 100113 C51 0.3- 0.4+ 260915 J87 0.2+ 0.1+ 091220 J95 0.3+ 0.1- 100113 C51 0.1- 1.3+ 260915 R85 0.2- 0.2- 091220 A24 1.3- 0.1- 100113 C51 0.3- 0.0 260916 A71 0.6+ 1.1+ 091220 A24 0.2- 0.4+ 100114 C51 0.5- 0.1+ 260916 K88 0.3- 0.2- 091220 J95 0.1+ 0.3+ 100114 C51 0.4- 0.0 260916 K88 0.1+ 0.0 091220 A24 0.7+ 1.0- 100114 C51 0.9- 0.3- 260916 A71 1.0- 0.3- 091220 A24 1.1- 0.2+ 100114 C51 0.6- 0.5+ 260916 K88 0.0 0.3+ 091220 A24 0.3- 0.1- 100114 C51 0.5- 0.2+ 260916 R85 0.4- 0.3+ 091220 A24 (0.5- 2.0-) 100114 C51 0.7- 0.1- 260916 A71 0.0 0.7+ 091220 473 0.1+ 0.3- 100114 C51 0.4- 0.5+ 260916 L04 0.3- 0.3+ 091220 473 0.3+ 0.4- 100115 A77 0.7+ 0.3+ 260916 A71 0.6+ 0.7- 091220 J95 0.2+ 0.2+ 100115 A77 0.9- 0.0 260916 R85 0.3+ 0.0 091220 J95 0.2+ 0.1+ 100115 A77 0.3+ 0.3- 260916 L04 0.5- 0.0 091220 J95 0.4+ 0.1+ 100115 204 0.3- 0.1+ 260916 561 0.5+ 0.1+ 091220 J95 0.2+ 0.1+ 100115 204 0.1- 0.1- 260916 561 0.5+ 0.2+ 091221 H01 0.4- 0.0 100115 473 0.1+ 0.1+ 260916 L85 0.2+ 0.5- 091221 H01 0.4- 0.1- 100115 473 0.1+ 0.1+ 260916 561 0.5+ 0.2+ 091221 H01 0.4- 0.1- 100116 349 0.1+ 0.0 260916 K88 0.0 0.1+ 091221 H01 0.3- 0.1- 100116 349 0.6+ 0.5+ 260916 033 0.3+ 0.3+ 091221 300 0.2+ 0.5- 100116 A71 0.3+ 0.3- 260916 033 0.2+ 0.0 091221 300 0.4+ 0.1- 100116 473 0.1- 0.2+ 260916 033 0.3+ 0.2- 091221 300 0.0 0.3+ 100116 473 0.1+ 0.2+ 260916 Z58 0.7+ 0.6+ 091221 300 0.5+ 0.6+ 100117 A77 0.7+ 0.4+ 260916 L85 0.5- 0.1+ 091221 300 0.8+ 0.4- 100117 A77 1.2+ 0.4- 260916 Z58 0.2- 0.9- 091221 473 0.3+ 0.3- 100118 A77 0.5+ 0.1- 260916 W62 0.3- 0.2- 091221 473 0.3+ 0.2- 100118 A77 0.6+ 0.2- 260916 W62 0.3- 0.1+ 091222 473 0.0 0.1+ 100118 160 0.7- 1.0- 260916 W62 0.6- 0.0 091222 473 0.0 0.1+ 100118 160 0.4- 0.9- 260917 K88 0.0 0.2- 091223 349 0.5+ 1.3- 100118 160 (1.8- 2.1-) 260917 K88 0.7+ 0.3+ 091223 349 0.1+ 1.4- 100119 160 0.2- 0.1+ 260917 K88 0.4+ 0.0 091223 349 0.2- 0.8- 100119 160 0.3- 0.0 260917 K88 0.5+ 0.1- 091225 A77 0.9- 0.2- 100119 160 0.3- 0.2- 260917 K74 0.2- 0.5- 091225 A77 0.5- 0.7- 100121 160 0.0 0.3- 260917 K88 0.3+ 0.3- 091225 A77 0.0 0.4- 100121 160 0.0 0.4- 260917 K74 0.2- 0.1+ 091226 B82 (2.5+ 0.9-) 100121 160 0.1- 0.9- 260918 M45 1.0+ 1.3- 091226 B82 0.6+ 0.8- 100123 561 (6.3+ 0.1-) 260918 M45 0.9+ 1.0- 091226 B82 0.2+ 0.2- 100123 561 0.8- 0.2+ 260918 M45 0.7+ 1.0- 091228 118 0.0 0.4- 100123 561 0.6- 0.1+ 260918 950 0.2- 0.7- 091228 118 0.1- 0.1- 100124 561 1.5- 0.7+ 260918 950 0.0 0.6- 091228 118 0.0 0.0 100124 561 (2.6- 0.6-) 260918 U94 0.5+ 0.6+ 091228 461 0.4- 0.2- 100124 561 1.7- 0.4- 260918 U94 0.4+ 0.1+ 091228 461 0.5- 0.5- 100201 587 0.7- 0.8+ 260918 L27 0.2+ 0.3+ 091228 461 0.1- 1.0+ 100201 587 0.1+ 0.2+ 260919 L27 0.1+ 0.1+ 091230 H06 0.7+ 0.4+ 100201 587 0.5+ 0.5- 260919 L27 0.2+ 0.4+ 091230 H06 0.7+ 1.3- 100207 704 0.3+ 0.3+ 260919 K88 0.4+ 0.1- 091230 H06 1.1+ 0.8- 100207 704 0.4+ 0.2+ 260919 K88 0.4+ 0.2+ 091230 349 0.5+ 0.9- 100207 704 1.1- 0.2- 260919 K88 0.5+ 0.2+ 091230 349 0.2- 0.3- 100207 704 1.4+ 0.4- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2026 Sept. 24