Nakano Note (Nakano wa Kangaeru noda) NK 5203 P/Leonard (2018 L5 = 2024 Hx)
The following improved orbital elements, by S. Nakano, are from 198 observations 2018 to 2024. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.57 arc second. Recovery by Erwin Schwab. Residuals for recovery observations were +48" for Right Ascension and -12" for Declination from the prediction in NK 4854 (= CH 2024) with the delta-T correction = -0.054 day. The comet has passed 0.40 AU and 0.37 AU from Jupiter on 1978 July 19 and 2014 Sept. 25 UT, respectively. Before close approach in 2014, the comet had an orbit of T= 2010 04 09.84, q= 3.497, e= 0.177, Peri.=17.9, Node= 294.1, Inc.= 3.5, a= 4.250 AU, P= 8.76 years. See the previous orbits in NK 3700, NK 3715 and NK 4854. Epoch = 2025 Mar. 26.0 TT T = 2025 Apr. 3.83892 +/- 0.00211 (m.e.) TT Peri. = 93.94473 +/- 0.00045 Node = 219.02574 +/- 0.00041 (2000.0) Inc. = 2.20945 +/- 0.00001 q = 2.3089227 +/- 0.0000052 AU e = 0.3635973 +/- 0.0000011 a = 3.6280845 +/- 0.0000104 AU n' = 0.14262248 +/- 0.00000061 P = 6.911 +/- 0.0000296 years T = 2018 May 4.47938 TT Epoch = 2018 May 2.0 TT Peri. = 93.63780 e = 0.3644097 Node = 219.15802 (2000.0) a = 3.6239059 AU Inc. = 2.20916 n'= 0.14286923 q = 2.3033195 AU P = 6.899 years The predicted orbit for the 2032 return is as follows: T = 2032 Feb. 27.27026 TT Epoch = 2032 Feb. 18.0 TT Peri. = 93.54926 e = 0.3616603 Node = 218.91670 (2000.0) a = 3.6348207 AU Inc. = 2.20768 n'= 0.14222619 q = 2.3202502 AU P = 6.930 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2018/ 180813 F51 0.2+ 0.1- 180914 585 0.2- 0.5+ 180608 I41 0.6+ 0.9+ 180813 F51 0.2- 0.2- 180914 585 0.4- 0.4+ 180608 I41 1.9+ 1.0+ 180813 F51 0.2+ 0.1- 180917 T05 0.1+ 0.2+ 180613 I41 1.2+ 0.6- 180813 F51 0.1- 0.3- 180917 T05 0.3- 0.3+ 180613 I41 0.2+ 0.8+ 180818 461 0.4- 0.1- 180917 T05 0.6- 0.5+ 180614 G96 0.5+ 0.1+ 180818 461 0.8- 0.1- 180917 T05 0.0 0.3+ 180614 G96 0.4- 0.2- 180818 461 0.9- 0.1+ 180917 T05 0.4- 0.4+ 180614 G96 0.6+ 0.0 180819 461 0.6- 0.2+ 180917 T05 0.3- 0.6- 180614 G96 0.1- 0.3+ 180819 461 0.4- 0.0 180917 T05 0.2- 0.1+ 180615 H36 0.2- 0.5- 180819 461 0.5- 0.1- 180917 T05 0.4- 0.0 180615 H36 0.5- 0.0 180821 J22 1.1- 0.8+ 180918 703 1.9- 0.7+ 180615 H36 0.0 1.1- 180821 J22 0.8- 0.6- 180918 703 (2.3- 0.2-) 180615 Q62 0.5+ 0.6+ 180821 J22 0.6- 1.1- 180918 703 (2.2- 0.5+) 180615 Q62 0.8+ 0.6+ 180821 F51 0.2- 0.1- 180918 703 1.7- 0.5+ 180615 Q62 0.7+ 0.5+ 180821 F51 0.2- 0.2- 180919 T08 0.3- 0.7+ 180615 Q62 0.4+ 0.5+ 180821 F51 0.1+ 0.2- 180919 T08 0.1+ 1.0- 180616 W96 0.2+ 0.7- 180821 F51 0.1- 0.2- 180919 T08 0.8- 0.2- 180616 W96 0.1+ 0.1- 180901 703 0.8- 0.5+ 180919 T08 0.8- 0.2+ 180616 W96 0.7- 0.1+ 180901 703 0.9- 0.1- 180921 461 0.1- 0.3+ 180616 W96 0.3+ 0.5+ 180901 703 1.5- 0.0 180921 461 0.1- 0.0 180617 G40 1.2- 0.0 180902 V03 1.3- 0.2+ 180929 703 0.9- 0.5- 180617 G40 0.4- 1.4- 180902 V03 1.2- 0.2+ 180929 703 0.9+ 0.1+ 180617 691 0.7+ 0.4+ 180902 V03 0.2- 0.1+ 180929 T05 0.3- 0.6- 180617 691 0.7- 1.2- 180902 V03 0.1- 0.2- 180929 T05 0.3+ 0.4+ 180617 691 0.0 0.4+ 180903 585 0.4- 0.6+ 180929 T05 0.1- 0.5+ 180618 I47 0.7+ 1.4- 180903 585 0.5- 0.6+ 180929 T05 0.6+ 0.1+ 180618 I47 0.1+ 1.1- 180903 585 0.5- 0.6+ 181001 J22 0.4+ 0.3+ 180618 I52 0.3- 0.2+ 180903 585 0.3- 0.5+ 181001 J22 0.4+ 0.3+ 180618 I52 0.1- 0.8+ 180903 585 0.5- 0.6+ 181001 J22 0.2+ 0.3+ 180618 I52 0.3+ 0.3- 180903 585 0.6- 0.6+ 181003 T05 0.4+ 0.2+ 180618 I52 0.3- 0.4- 180903 585 0.5- 0.7+ 181003 T05 0.4+ 1.8- 180619 I52 0.6+ 0.1+ 180903 585 0.5- 0.6+ 181003 T05 0.4- 0.3+ 180619 I52 0.1+ 0.2- 180903 585 0.6- 0.5+ 181003 T05 0.2- 0.4+ 180619 I52 1.2- 0.1- 180903 585 0.4- 0.6+ 181004 F52 0.4+ 0.1+ 180619 I52 0.0 0.6- 180903 585 0.5- 0.6+ 181004 F52 0.5+ 0.1+ 180621 L01 0.3- 0.2+ 180903 585 0.2+ 0.5+ 181004 F52 0.4+ 0.1+ 180621 L01 0.2+ 0.2- 180904 J22 0.0 0.1- 181004 F52 0.4+ 0.1+ 180621 L01 0.1- 0.9- 180904 J22 0.5+ 0.1+ 181006 G96 (1.6+ 2.5+) 180621 I52 0.5- 0.0 180904 J22 0.0 0.2- 181006 G96 0.7+ 0.9+ 180621 I52 0.7- 1.0- 180907 703 0.8- 0.1- 181006 G96 1.1+ 1.1+ 180621 I52 0.5- 0.4- 180907 703 (2.0- 1.4-) 181006 G96 0.7+ 0.4+ 180621 I52 0.5- 1.2- 180907 703 (2.3- 0.8-) 181009 461 0.6+ 0.3+ 180622 291 1.1- 0.3+ 180907 703 (3.3- 1.6-) 181009 461 0.1+ 0.3+ 180622 291 0.6+ 0.7+ 180908 D29 1.3- 0.2- 181009 461 0.3+ 0.5+ 180622 291 1.0- 0.1+ 180908 D29 1.1- 0.0 181011 J22 0.5+ 0.2+ 180622 I52 0.6- 0.5- 180908 D29 (2.4- 0.5-) 181011 J22 0.3+ 0.3+ 180622 I52 0.7- 0.6- 180911 Q62 0.2- 0.1- 181011 J22 0.3+ 0.3+ 180622 I52 0.8- 0.5- 180911 Q62 0.1+ 0.4- 181015 F52 0.4+ 0.2+ 180623 I52 0.6- 0.4- 180912 G96 1.5- 0.8- 181015 F52 0.2+ 0.1- 180623 I52 0.0 0.1- 180912 G96 (2.0- 0.6-) 181015 F52 0.5+ 0.2+ 180623 I52 0.7- 0.6- 180912 G96 1.2- 0.5- 181015 F52 0.3+ 0.5+ 180623 I52 0.7- 0.2- 180912 G96 0.8- 0.3- 181015 T05 0.6+ 0.2+ 180625 I52 (2.0+ 1.6+) 180912 703 (3.4- 0.2-) 181015 T05 0.5+ 1.3+ 180625 I52 1.1+ 0.2+ 180912 703 (2.3- 0.5-) 181015 T05 0.1+ 0.5+ 180625 I52 0.6- 0.4+ 180912 703 0.6- 0.6- 181015 T05 0.9+ 0.5- 180625 I52 0.6- 0.2+ 180913 I52 0.2- 0.0 181214 G96 0.1+ 0.2+ 180701 I52 0.4- 0.6- 180913 I52 0.8- 0.3- 181214 G96 0.9+ 0.1- 180701 I52 0.5- 0.0 180913 I52 0.3- 0.2- 181214 G96 (3.0+ 0.3+) 180701 I52 1.8- 0.6- 180913 I52 1.2- 1.1- 2019/ 180709 215 1.6- 0.4- 180914 585 0.2- 0.2+ 191219 F51 0.3- 0.2- 180709 215 1.9- 0.8- 180914 585 0.1+ 0.6+ 191219 F51 0.0 0.2- 180709 215 (2.2- 0.2-) 180914 585 0.2- 0.2- 191219 F51 0.1+ 0.1- 180713 F51 0.4+ 0.4+ 180914 585 0.4- 0.4+ 2024/ 180713 F51 0.2+ 0.0 180914 585 0.1- 0.1- 240418 Z84 0.3+ 0.3+ 180713 F51 0.3+ 0.1- 180914 585 0.1- 0.6+ 240418 Z84 0.2- 0.1+ 180719 F52 0.1+ 0.2- 180914 585 0.4- 0.5+ 240418 Z84 0.2- 0.4+ 180719 F52 0.2+ 0.1- 180914 585 0.6- 0.3+ 240418 Z84 0.3+ 0.4+ 180719 F52 0.2+ 0.3- 180914 585 0.3- 0.5+ 240421 K92 0.4+ 0.5+ 180719 F52 0.2+ 0.2- 180914 585 0.2- 0.8+ 240421 K92 0.2+ 0.1+ 180812 A71 0.4- 0.7- 180914 585 0.5- 0.3+ 240421 K92 0.1- 0.2+ 180812 A71 0.1+ 0.7- 180914 585 0.5- 0.2+ 180813 A71 0.3+ 0.2- 180914 585 0.5- 0.2+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2024 Apr. 24