Nakano Note (Nakano wa Kangaeru noda) NK 4518 P/Scotti (2011 A2 = 2021 Q2)
The following improved orbital elements, by S. Nakano, are from 252 observations 2011 to 2021. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.66 arc second. Residuals of recovery observations were -16'.0 for Right Ascension and +1'.8 for Declintion from the prediction in NK 2493/3673 (= HICQ 2015/2021) with the delta-T correction = +0.79 day. The comet was not recovered on 2016 return. The comet has passed 0.89 AU from the Earth on 2011 Apr. 3 UT and 0.41 AU from Jupiter on 1986 April. See the previous orbits in NK 2091, NK 2493 and NK 3673. Epoch = 2021 Dec. 12.0 TT T = 2021 Dec. 2.23421 +/- 0.00072 (m.e.) TT Peri. = 94.50317 +/- 0.00029 Node = 54.67414 +/- 0.00016 (2000.0) Inc. = 4.47479 +/- 0.00002 q = 1.5546529 +/- 0.0000035 AU e = 0.4996221 +/- 0.0000011 a = 3.1069573 +/- 0.0000097 AU n' = 0.17997043 +/- 0.00000084 P = 5.476 +/- 0.0000256 years T = 2010 Dec. 22.50367 TT Epoch = 2010 Dec. 30.0 TT Peri. = 94.58844 e = 0.4986534 Node = 54.72698 (2000.0) a = 3.1092043 AU Inc. = 4.47399 n'= 0.17977537 q = 1.5587890 AU P = 5.482 years [ T = 2016 June 14.33106 TT Epoch = 2016 June 21.0 TT Peri. = 94.64809 e = 0.4999408 Node = 54.67553 (2000.0) a = 3.1054150 AU Inc. = 4.47537 n'= 0.18010452 q = 1.5528914 AU P = 5.472 years ] The predicted orbit for the 2027 return is as follows: T = 2027 May 22.35786 TT Epoch = 2027 June 4.0 TT Peri. = 94.49638 e = 0.5007326 Node = 54.62990 (2000.0) a = 3.1030709 AU Inc. = 4.47633 n'= 0.18030864 q = 1.5492621 AU P = 5.466 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2011/ 110212 291 0.6- 0.5+ 110406 H47 0.7- 0.3+ 110111 691 0.3+ 0.5- 110212 291 0.5- 0.0 110407 691 1.2- 0.2+ 110111 691 0.3- 0.0 110212 291 0.1- 0.1+ 110407 691 1.8- 0.3+ 110111 691 0.6- 0.6+ 110212 291 0.5- 0.0 110407 691 (5.0- 0.7+) 110111 291 1.7- 0.6+ 110212 291 0.1- 0.1- 110408 I93 0.1+ 0.0 110111 291 0.5- 0.2+ 110212 291 0.1- 0.0 110408 I93 0.3- 0.3+ 110111 291 0.7- 0.3+ 110216 H15 0.2+ 1.7- 110408 I93 0.6+ 0.1+ 110111 300 0.6- 1.3+ 110216 H15 0.5+ 0.1- 110408 I93 0.1+ 0.0 110111 300 0.7+ 1.2+ 110216 H15 0.3- 0.5+ 110408 958 1.2- 1.1- 110111 300 0.5- 0.5+ 110216 H15 0.9- 0.5+ 110408 958 1.0+ 0.2- 110112 J04 0.0 0.0 110219 H15 1.4- 0.4- 110408 I93 0.1+ 0.3- 110112 J04 0.2+ 0.0 110225 J01 0.6+ 0.0 110408 958 1.1+ 0.0 110112 J04 0.1+ 0.2- 110225 J01 0.1+ 0.4- 110409 958 (2.4- 2.6-) 110113 J04 0.2+ 0.2- 110225 J01 0.0 0.5- 110409 958 (3.6+ 2.2-) 110113 J04 0.4+ 0.7- 110227 A71 0.7+ 0.0 110409 958 (2.7+ 0.2-) 110113 J04 0.2- 0.4- 110227 A71 0.6- 0.4+ 110409 H10 0.3- 0.4- 110113 291 0.6- 0.0 110301 H10 1.0- 0.5+ 110409 H10 0.3- 1.1- 110113 291 1.5- 0.4+ 110301 H10 0.8+ 0.4+ 110410 J01 0.1+ 0.1- 110113 291 0.2- 0.7- 110301 291 0.4- 0.3+ 110410 J01 0.4+ 0.3- 110113 291 (3.0- 0.8+) 110301 291 0.2- 0.3+ 110410 J01 0.0 0.0 110113 291 0.6+ 0.0 110301 291 0.4- 0.3+ 110411 704 0.2+ 1.1+ 110113 291 0.7- 0.1- 110302 J01 0.8+ 0.2- 110411 704 0.3- 0.5- 110113 291 0.8- 0.3+ 110302 J01 0.8+ 0.0 110411 704 0.5- 0.9+ 110113 291 0.9- 0.3+ 110302 J01 0.3+ 0.3+ 110411 704 0.0 0.0 110113 291 0.4- 0.3+ 110302 H10 1.0- 0.1- 110411 704 0.4- 0.1+ 110113 291 0.5- 0.2- 110302 H10 0.6+ 0.2- 110412 291 0.6- 0.2- 110113 291 1.2- 0.8- 110303 H45 0.8+ 0.4- 110412 291 0.7- 0.1+ 110113 E10 0.9+ 0.8- 110303 H45 0.8+ 0.1+ 110412 291 0.8- 0.0 110113 E10 0.4+ 0.6- 110303 H45 0.1+ 0.6+ 110412 300 0.6+ 0.2+ 110113 E10 0.4+ 0.5- 110303 H45 0.3+ 0.9+ 110412 300 0.6+ 0.1+ 110113 E10 0.3+ 0.1- 110303 H45 1.4+ 0.9+ 110412 300 0.7+ 0.1- 110113 E10 0.6+ 0.7- 110303 H45 0.7+ 0.2- 110412 300 0.8+ 0.9+ 110113 E10 0.9+ 0.6- 110303 H45 0.4- 0.5+ 110413 F51 0.1+ 0.1+ 110114 I89 1.3+ 0.8- 110305 C10 1.1+ 0.0 110413 F51 0.8+ 0.1- 110114 I89 1.7+ 0.6- 110305 C10 1.2+ 0.3- 110414 958 0.0 0.3+ 110114 I89 1.9+ 0.6- 110305 349 0.8+ 0.8+ 110414 958 (1.3- 2.9-) 110114 H36 0.1+ 0.3- 110305 349 0.3+ 1.2+ 110414 958 0.1- 0.4- 110114 H36 0.3- 0.7- 110306 D90 1.2+ 0.0 110415 F51 0.0 0.0 110114 H36 0.3- 0.3- 110306 D90 0.3+ 0.1- 110415 F51 0.1+ 0.0 110114 291 0.5- 0.5- 110306 D90 0.3+ 0.3+ 110415 F51 0.1+ 0.1- 110114 291 0.6- 0.4- 110308 561 1.4- 1.8+ 110415 F51 0.1+ 0.1- 110114 H01 0.7+ 0.3- 110308 561 0.1- 0.1- 110422 958 0.1- 1.3- 110114 291 1.0+ 1.5- 110308 561 0.0 0.4- 110422 958 0.4- 0.8+ 110114 H01 0.8+ 0.3- 110308 561 0.3- 0.1- 110422 958 (3.5+ 1.1+) 110114 H01 0.6+ 0.4- 110308 561 1.2+ 0.6+ 110426 704 0.7+ 1.2+ 110116 A77 0.2- 0.9- 110315 E07 1.4+ 0.4+ 110426 704 0.0 0.1+ 110116 A77 1.1+ 0.3- 110315 E07 1.3+ 0.2- 110426 704 0.3+ 0.1- 110116 213 0.5- 1.4+ 110326 691 0.1+ 0.2- 110426 704 0.8+ 0.2- 110116 213 0.1- 1.1+ 110326 691 1.0- 0.8+ 110426 704 1.2- 0.1- 110116 E85 0.9+ 1.6- 110326 691 0.7- 0.3+ 110428 D29 0.1+ 0.3+ 110116 E85 0.7+ 0.3+ 110327 D90 0.6+ 0.1- 110428 D29 0.3- 0.4+ 110116 E85 (2.7- 0.2+) 110327 D90 0.2+ 0.2- 110428 D29 0.6- 0.1+ 110117 204 0.2- 0.0 110327 D90 0.7+ 0.1+ 110428 D29 0.5- 1.7- 110117 204 0.3- 0.3- 110328 704 1.9- 0.1- 110430 G96 0.6- 0.3+ 110122 349 0.5- 0.5- 110328 704 1.9- 0.9- 110430 G96 0.7- 0.1+ 110122 349 1.3- 1.4- 110328 704 1.1- 0.9+ 110430 G96 1.2- 0.2+ 110130 703 (3.3- 1.8+) 110329 C10 0.2- 1.3- 110430 G96 1.3- 0.4+ 110130 703 1.6- 0.2+ 110329 C10 (2.9- 1.5-) 110503 291 0.6- 0.0 110130 703 0.1- 0.5+ 110330 I40 0.6+ 0.3+ 110503 291 0.8- 0.4+ 110131 J01 0.7- 0.7- 110330 I40 0.7+ 0.7+ 110503 291 0.5- 0.2- 110131 J01 0.2+ 0.6- 110330 I40 (2.9- 2.7-) 110505 291 0.6- 0.0 110131 J01 0.2- 0.8- 110330 I40 (2.4- 2.8-) 110505 291 0.3- 0.1+ 110131 349 0.6- 0.5+ 110330 I40 0.4- 0.0 110505 291 0.4- 0.3+ 110131 349 1.4- 0.2- 110330 I40 (0.4- 2.6-) 110505 291 0.6- 0.1+ 110202 J01 1.2- 1.0- 110330 I40 (0.2+ 2.4-) 110505 291 0.5- 0.3+ 110202 J01 0.6- 0.7- 110330 I40 (0.5+ 2.5-) 110505 291 0.7- 0.4+ 110202 A77 0.6+ 0.7- 110330 I40 0.4+ 0.5- 110505 291 0.4- 0.1+ 110202 A77 1.8- 0.7+ 110330 I40 (1.5+ 2.2-) 110505 291 0.3- 0.1+ 110202 A77 0.0 0.8+ 110330 I40 (2.9+ 2.2-) 110505 291 0.2- 0.3+ 110202 J01 1.1- 0.1- 110330 I40 (4.1+ 2.6-) 110512 G96 0.4- 0.2+ 110205 213 0.2+ 1.0- 110330 I40 0.4+ 0.3- 110512 G96 1.1- 0.0 110205 213 0.2- 0.3- 110330 I40 0.1+ 0.3+ 110512 G96 0.9- 0.3+ 110206 H10 1.5- 0.4- 110330 I40 0.3+ 0.1+ 110512 G96 0.6- 0.1- 110206 H10 0.3+ 0.6- 110330 I40 0.5+ 0.1- 2021/ 110206 H10 (2.7- 0.8-) 110331 J01 1.1+ 0.0 210820 I41 0.9- 0.6+ 110208 215 0.4+ 0.6+ 110331 J01 1.1+ 0.4+ 210820 I41 0.5- 0.6+ 110208 215 0.5+ 0.5+ 110331 J01 (2.1+ 0.4+) 210820 I41 1.8+ 0.9+ 110208 215 0.2+ 0.1+ 110331 900 0.4- 0.5+ 210820 I41 0.7- 0.7+ 110208 703 0.5- 1.1- 110331 900 0.0 0.1- 210820 I41 (2.4+ 1.0+) 110208 703 1.4- 0.3+ 110402 D90 0.2+ 0.1- 210820 I41 0.5- 0.7+ 110208 703 (2.9- 0.9-) 110402 D90 0.2+ 0.1- 210820 I41 0.9- 1.1+ 110209 958 (4.5- 0.5-) 110402 D90 0.1- 0.3- 210823 I41 0.5+ 0.9+ 110209 958 (4.8- 1.8-) 110403 561 0.4+ 0.2- 210823 I41 0.5+ 0.5+ 110209 958 1.0- 0.1+ 110403 561 0.1+ 0.1- 210823 I41 0.4+ 1.0+ 110210 A71 0.6- 0.4+ 110403 561 0.1- 0.2+ 210823 I41 0.0 0.6+ 110210 A71 0.2+ 0.6+ 110403 561 0.1- 0.1- 210824 I41 0.6- 0.6+ 110210 958 0.6- 0.7+ 110403 561 0.2+ 0.1- 210824 I41 0.1+ 0.6+ 110210 958 (2.4- 1.7+) 110405 A77 0.3+ 0.7+ 210824 I41 1.2- 0.6+ 110210 291 1.5+ 0.2- 110405 A77 0.3+ 0.1+ 210825 I41 1.1+ 0.8+ 110210 291 0.6+ 0.2- 110405 A77 0.2+ 0.5+ 210825 I41 0.7+ 1.3+ 110210 291 1.1+ 0.3- 110406 958 0.3+ 1.3- 210825 I41 1.0+ 0.6+ 110212 958(10.0- 4.6+) 110406 958 0.9+ 1.0+ 210825 I41 1.1+ 1.3+ 110212 291 0.2- 0.2+ 110406 958 (0.4- 2.5+) 210825 I41 (0.3- 2.1+) 110212 291 0.7- 0.2+ 110406 H47 (3.4- 0.9-) 110212 291 0.3- 0.1- 110406 H47 0.8+ 0.2+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 Aug. 28