Nakano Note (Nakano wa Kangaeru noda) NK 5400 P/PANSTARRS (2018 L1 = SG0CE2F = H268102 = P128Vrd = 2025 Gx)
The following improved orbital elements, by S. Nakano, are from 83 observations 2011 to 2025, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 0.45 arc second. The residuals of recovery observations on 2025 April 9 were +58" for Right Ascension and -18" for Declination from the prediction in NK 3713 (= CH 2025) with the delta-T correction = -0.04 day. The comet has passed 1.07 AU from Jupiter on 2002 Aug. 31 and will pass 0.52 AU from Jupiter on 2048 Nov. 27 UT. See the previous orbits in NK 3698 and NK 3713. Identifications with the followig objects SG0CE2F, H268102 and P128Vrd by T. Kobayashi. SG0CE2F* C2011 04 11.31330 12 48 38.62 -22 18 27.2 19.9 Vr 703 SG0CE2F C2011 04 11.32280 12 48 38.01 -22 18 24.7 20.4 Vr 703 SG0CE2F C2011 04 11.33174 12 48 37.58 -22 18 22.1 19.8 Vr 703 SG0CE2F C2011 04 11.34071 12 48 37.22 -22 18 19.1 19.5 Vr 703 H268102*4C2017 01 23.42951 09 58 17.31 +00 33 53.6 24.5 r1 T09 H268102 4C2017 01 23.44606 09 58 16.73 +00 33 54.4 24.4 r1 T09 H268102 4C2017 01 23.52648 09 58 13.90 +00 33 58.7 24.2 i1 T09 H268102 4C2017 01 23.57809 09 58 12.11 +00 34 01.6 23.8 i1 T09 P128Vrd C2025 03 31.43343213 56 38.346-27 25 48.48 21.12wX F51 P128Vrd C2025 03 31.44405113 56 37.956-27 25 48.16 21.35wX F51 P128Vrd C2025 03 31.46071613 56 37.345-27 25 47.21 21.24wX F51 P128Vrd C2025 03 31.47134713 56 36.954-27 25 46.94 21.23wX F51 Epoch = 2025 Nov. 21.0 TT T = 2025 Nov. 5.54406 +/- 0.00177 (m.e.) TT Peri. = 17.94161 +/- 0.00063 Node = 268.58189 +/- 0.00016 (2000.0) Inc. = 10.57474 +/- 0.00003 q = 1.8973694 +/- 0.0000027 AU e = 0.4813128 +/- 0.0000012 a = 3.6580225 +/- 0.0000097 AU n' = 0.14087519 +/- 0.00000056 P = 6.996 +/- 0.0000278 years A1 = +0.257 +/- 0.112 A2 = -0.05946 +/- 0.00089 T = 2011 Dec. 5.97731 TT Epoch = 2011 Dec. 25.0 TT Peri. = 17.67756 e = 0.4879284 Node = 268.77150 (2000.0) a = 3.6253029 AU Inc. = 10.63126 n'= 0.14278666 q = 1.8564147 AU P = 6.903 years T = 2018 Nov. 12.52884 TT Epoch = 2018 Nov. 18.0 TT Peri. = 17.89158 e = 0.4830728 Node = 268.62705 (2000.0) a = 3.6477777 AU Inc. = 10.59470 n'= 0.14146908 q = 1.8856355 AU P = 6.967 years The predicted orbit for the 2032 return is as follows: T = 2032 Oct. 28.84244 TT Epoch = 2032 Oct. 15.0 TT Peri. = 17.86039 e = 0.4830979 Node = 268.58529 (2000.0) a = 3.6514162 AU Inc. = 10.59013 n'= 0.14125768 q = 1.8874248 AU P = 6.977 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2011/ 180604 G40 0.7+ 0.2- 180620 215 1.2+ 0.1- 110411 703 0.3+ 0.8+ 180604 G40 0.1- 0.2+ 180620 215 0.2+ 0.3- 110411 703 1.1- 0.0 180604 G40 0.6+ 0.2- 180620 215 1.2+ 0.2- 110411 703 0.5- 0.5- 180604 G40 0.4+ 0.2- 180713 Q62 0.5+ 0.4- 110411 703 1.2+ 0.6- 180605 691 0.1+ 0.4- 180713 Q62 0.5+ 0.3- 2017/ 180605 691 0.5+ 0.5- 180713 Q62 0.4+ 0.1- 170123 T09 0.1+ 0.2- 180605 691 1.2+ 0.5- 180718 474 0.3+ 0.4- 170123 T09 0.1+ 0.3- 180605 F65 0.2- 0.6+ 180718 474 0.8+ 0.3- 170123 T09 0.0 0.3- 180605 F65 0.2- 0.2+ 180718 474 0.2+ 0.1- 170123 T09 0.3+ 0.2- 180605 F65 0.5- 0.6+ 180809 474 0.1+ 0.1- 2018/ 180605 F65 0.7- 0.7+ 180809 474 0.6+ 0.6- 180518 G96 0.3- 0.1- 180605 F65 0.3- 0.4+ 180809 474 0.3+ 1.1- 180518 G96 0.3+ 0.8- 180605 F65 0.3- 0.4+ 180811 474 0.2+ 0.3- 180518 G96 0.2+ 0.1+ 180605 F65 0.1- 0.8+ 180811 474 0.1- 0.3- 180518 G96 0.2- 0.1+ 180605 F65 0.0 0.1- 180811 474 0.3+ 0.2- 180603 F51 0.1- 0.1+ 180606 691 1.2+ 0.3- 180811 474 0.4+ 0.2- 180603 F51 0.3- 0.1+ 180606 691 0.5+ 0.2- 180906 474 0.0 0.1+ 180603 F51 0.3- 0.2+ 180606 691 0.9+ 0.0 180906 474 0.0 0.0 180604 H36 0.4+ 0.2+ 180606 568 0.3- 0.1+ 180906 474 0.2+ 0.0 180604 H36 1.1+ 0.7+ 180606 568 0.3- 0.1+ 180906 474 0.6+ 0.2- 180604 I52 0.2+ 1.0- 180606 568 0.3- 0.1+ 181027 Q62 0.7- 0.0 180604 H36 0.4- 0.4+ 180607 I52 0.1+ 0.3- 181027 Q62 0.4- 0.2- 180604 I52 1.0+ 0.2+ 180607 I52 0.3+ 0.1- 2025/ 180604 I52 0.1- 0.1+ 180607 I52 1.5+ 0.4- 250331 F51 0.0 0.1+ 180604 I52 0.8+ 0.1- 180607 G40 0.5+ 0.3- 250331 F51 0.0 0.1- 180604 Q62 0.1- 0.5- 180607 G40 0.4+ 0.2- 250331 F51 0.0 0.1+ 180604 Q62 0.0 0.5- 180616 474 0.3+ 0.1+ 250331 F51 0.0 0.2- 180604 Q62 0.1+ 0.5- 180616 474 0.1+ 0.1- 250409 X07 0.6- 0.1+ 180604 G40 0.1+ 0.1+ 180616 474 0.3+ 0.2- 250409 X07 0.1- 0.3+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2025 Apr. 10