Nakano Note (Nakano wa Kangaeru noda) NK 5426 P/McNaught (2005 J1 = 2025 O1)
The following improved orbital elements, by S. Nakano, are from 104 observations 2005 to 2025. 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. Residuals for the recovery observations were -4'.8 for Right Ascension and -1'.1 for Declination from the prediction in NK 1382 (= CH 2025) with the delta-T correction = +0.11 day. The comet has passed 0.13 AU from Jupiter on 1989 Oct. 13. Former orbit before this colse approach, comet had an orbit of T= 1983 Nov. 23, q= 2.0328 AU, e= 0.4964, Peri.= 325.4, Node= 270.2, Inc.= 30.0, a= 4.0365 AU, P= 8.11 years. See the previous orbits in YC 2469, NK 1382 and CBET 5592 (same orbit). Epoch = 2025 July 24.0 TT T = 2025 July 11.25512 +/- 0.00023 (m.e.) TT Peri. = 338.88159 +/- 0.00014 Node = 268.83018 +/- 0.00002 (2000.0) Inc. = 31.73347 +/- 0.00004 q = 1.5393147 +/- 0.0000010 AU e = 0.5694153 +/- 0.0000003 a = 3.5749408 +/- 0.0000033 AU n' = 0.14581452 +/- 0.00000020 P = 6.759 +/- 0.0000093 years T = 2005 Apr. 17.30504 TT Epoch = 2005 Apr. 20.0 TT Peri. = 338.92192 e = 0.5709662 Node = 268.84109 (2000.0) a = 3.5664733 AU Inc. = 31.76549 n'= 0.14633412 q = 1.5301375 AU P = 6.735 years [ T = 2012 Jan. 15.62862 TT Epoch = 2012 Feb. 3.0 TT Peri. = 338.97385 e = 0.5698093 Node = 268.80462 (2000.0) a = 3.5729579 AU Inc. = 31.73397 n'= 0.14593593 q = 1.5370531 AU P = 6.754 years ] [ T = 2018 Oct. 12.63151 TT Epoch = 2018 Oct. 9.0 TT Peri. = 338.92465 e = 0.5703767 Node = 268.79586 (2000.0) a = 3.5692805 AU Inc. = 31.76849 n'= 0.14616152 q = 1.5334460 AU P = 6.743 years ] The predicted orbit for the 2032 return is as follows: T = 2032 Apr. 10.92566 TT Epoch = 2032 Mar. 29.0 TT Peri. = 338.96127 e = 0.5708446 Node = 268.76583 (2000.0) a = 3.5676165 AU Inc. = 31.80087 n'= 0.14626379 q = 1.5310618 AU P = 6.739 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2005/ 050505 E12 0.3+ 0.0 050618 170 0.3- 0.2+ 050503 E12 0.9+ 0.7- 050505 E12 0.6- 0.5+ 050625 213 0.2+ 0.4+ 050503 E12 0.0 0.5- 050505 474 0.2- 0.1+ 050625 213 0.2+ 0.2+ 050503 E12 0.2- 0.7- 050505 474 0.5+ 0.1+ 050625 213 0.1+ 0.1+ 050503 E12 (3.1- 0.8-) 050508 651 0.4- 0.3- 050628 704 0.3+ 0.8+ 050503 E12 0.2+ 0.4+ 050508 651 0.3- 1.0+ 050628 704 0.8- 0.1- 050503 E12 0.0 0.4+ 050508 651 (0.1+ 2.0-) 050628 704 0.4- 0.3+ 050503 E12 0.2- 0.0 050510 372 (2.9- 2.4-) 050628 704 0.5- 0.2+ 050503 E12 0.3+ 0.1+ 050512 372 0.6- 0.2+ 050628 048 (2.2+ 0.4+) 050503 E12 0.4+ 0.6+ 050513 673 0.6+ 0.1- 050628 048 1.1+ 0.1- 050503 E12 0.3- 0.2- 050513 673 0.4+ 0.2+ 050628 048 0.2- 1.4- 050504 854 (2.8+ 0.3-) 050513 673 0.1+ 0.0 050702 213 0.2- 0.4+ 050504 854 0.9+ 0.0 050513 673 0.5+ 0.2+ 050702 213 0.3- 0.6- 050504 854 0.5- 0.4- 050515 372 1.8+ 0.8- 050703 413 0.5+ 0.3+ 050504 474 0.7- 0.3- 050515 360 0.4- 0.3- 050705 147 (2.7- 2.2-) 050504 474 0.1- 0.1- 050515 360 0.3- 0.1+ 050705 147 1.0+ 1.1- 050504 474 0.1+ 0.0 050515 360 0.5- 0.0 050705 147 1.3- 0.5+ 050504 474 0.3- 0.3- 050516 372 0.1+ 0.1- 050705 147 (3.1- 2.1-) 050504 E12 0.4- 0.8+ 050529 213 0.4- 0.7- 050709 673 0.6+ 0.8+ 050504 E12 0.1- 0.7+ 050529 213 0.4- 0.1- 050709 673 0.3+ 0.4+ 050504 E12 0.2+ 0.1+ 050529 213 0.1- 0.1+ 050709 673 0.3+ 0.4+ 050504 E12 0.3- 0.3- 050604 703 (3.5- 1.6-) 050725 118 0.1- 1.1- 050504 E12 0.0 0.4- 050604 703 (2.4- 0.9-) 050725 118 1.6- 1.3- 050504 E12 0.2- 0.6+ 050604 703 1.3- 1.1- 050807 J95 1.3+ 0.9+ 050504 E12 1.1+ 1.0- 050605 213 0.7+ 0.5- 050807 J95 0.2- 0.8- 050504 E12 0.6- 0.6- 050605 213 0.5+ 0.4- 050809 A33 (0.1+ 9.3-) 050504 E12 0.2- 0.1- 050609 704 1.1- 0.3+ 2025/ 050504 E12 0.4- 0.1- 050609 704 0.4+ 0.4+ 250729 W94 0.9+ 0.6- 050504 E12 0.2- 0.3+ 050609 704 0.5- 0.4+ 250729 W94 0.8+ 0.3+ 050504 E12 0.1+ 0.0 050609 704 0.1+ 0.1- 250729 W94 0.4+ 0.7- 050504 E12 0.7- 0.9+ 050609 704 0.2+ 0.8+ 250730 X10 1.5+ 0.1+ 050505 474 0.5- 0.3- 050616 673 0.6+ 1.0+ 250730 X10 1.3+ 0.0 050505 474 0.1- 0.3- 050616 673 0.5+ 1.1+ 250730 X10 0.1- 0.7+ 050505 474 0.0 0.1+ 050616 673 0.6+ 0.5+ 250731 474 0.2+ 0.0 050505 E12 0.2- 0.4- 050616 673 0.6+ 0.8+ 250731 474 0.1- 0.2- 050505 E12 0.1+ 0.5+ 050617 213 0.0 0.5- 250731 474 0.0 0.1+ 050505 E12 0.9+ 0.5- 050617 213 0.0 0.3- 250731 474 0.7- 0.1+ 050505 E12 0.5+ 0.3+ 050617 213 0.3+ 0.0 250807 Z84 0.2+ 0.1- 050505 E12 0.7- 0.4+ 050618 170 0.7- 0.7- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2025 Aug. 13