Nakano Note (Nakano wa Kangaeru noda) NK 5369 323P/SOHO
The following improved orbital elements, by S. Nakano, are from 151 observations 2012 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 +/- 0.71 arc second. Residuals for 2025 January 27 were -46" for Right Ascention and +20" for Declination from the prediction in NK 5025 (= CH 2025) with the delta-T correction = +0.01 day. The comet has passed 0.27 AU from Jupiter on 2015 Feb. 13 and will pass 0.28 AU from Jupiter on 2026 Dec. 8 UT. See the previous orbits in NK 1774, NK 3011, NK 3657 and NK 5025. Epoch = 2025 Mar. 26.0 TT T = 2025 Mar. 14.08544 +/- 0.00001 (m.e.) TT Peri. = 353.12689 +/- 0.00018 Node = 324.27962 +/- 0.00017 (2000.0) Inc. = 5.32685 +/- 0.00003 q = 0.0397536 +/- 0.0000002 AU e = 0.9846136 +/- 0.0000000 a = 2.5836859 +/- 0.0000140 AU n' = 0.23732556 +/- 0.00000194 P = 4.153 +/- 0.0000340 years A1 = 0.000 fixed A2 = -0.00210 +/- 0.00001 T = 2012 Aug. 20.16460 TT Epoch = 2012 Aug. 21.0 TT Peri. = 353.41012 e = 0.9814062 Node = 323.88845 (2000.0) a = 2.6120741 AU Inc. = 6.22296 n'= 0.23346718 q = 0.0485683 AU P = 4.222 years T = 2016 Nov. 23.63128 TT Epoch = 2016 Nov. 28.0 TT Peri. = 353.12096 e = 0.9846275 Node = 324.27631 (2000.0) a = 2.5838415 AU Inc. = 5.33070 n'= 0.23730411 q = 0.0397201 AU P = 4.153 years T = 2021 Jan. 17.63124 TT Epoch = 2021 Jan. 26.0 TT Peri. = 353.17383 e = 0.9848136 Node = 324.22940 (2000.0) a = 2.5816816 AU Inc. = 5.36994 n'= 0.23760197 q = 0.0392065 AU P = 4.148 years The predicted orbit for the 2029 return is as follows: T = 2029 June 17.45475 TT Epoch = 2029 July 3.0 TT Peri. = 352.82820 e = 0.9822573 Node = 324.64155 (2000.0) a = 2.6111241 AU Inc. = 4.83371 n'= 0.23359461 q = 0.0463283 AU P = 4.219 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2012/ 161123 249(33.9- 13.4+)Y 210303 G37 0.1+ 0.0 120819 249 0.8+ 3.0- Y 161123 249(38.5- 30.9+)Y 210303 G37 0.1+ 0.1- 120819 249 10.5- 17.8+ Y 161123 249(45.6- 65.1+)Y 210303 G37 0.1- 0.3+ 120820 249 1.5+ 0.0 Y 161123 249 22.5- 25.2+ Y 210303 G37 0.3+ 0.2+ 120820 249 2.3- 4.0- Y 161123 249 (4.0- 30.9+)Y 210303 568 0.0 0.1- 120820 249 1.3+ 4.5+ Y 161123 249(36.6- 54.1+)Y 210303 568 0.1+ 0.0 120820 249 2.8+ 9.5- Y 2020/ 210303 568 0.1- 0.0 120820 249 12.4+ 0.8- Y 201221 568 0.8- 0.6+ 210303 568 0.1- 0.1- 120820 249 12.1+ 10.8- Y 201221 568 1.0- 0.4+ 210303 568 0.0 0.1+ 120820 249 10.7+ 7.5- Y 201221 568 1.0- 0.6+ 210303 568 0.1+ 0.0 120820 249 17.9+ 11.6- Y 201221 568 1.1- 0.6+ 210303 568 0.1- 0.0 120820 249 7.5+ 10.2- Y 2021/ 210303 568 0.0 0.1+ 120820 249 3.7+ 6.1- Y 210206 T14 0.1- 0.1- 210303 568 0.0 0.0 120820 249 25.8+ 20.5- Y 210207 T14 0.0 0.1- 210303 568 0.0 0.0 120820 249 21.8+ 9.9- Y 210207 T14 0.3- 0.1- 210303 568 0.0 0.1+ 120820 249 0.7+ 10.6- Y 210207 T14 0.2- 0.1- 210303 568 0.1- 0.1+ 120820 249 10.2+ 4.0+ Y 210208 T14 0.0 0.1- 210303 568 0.1+ 0.1+ 120820 249(54.5- 6.9-)Y 210208 T14 0.2- 0.2- 210303 568 0.1+ 0.1+ 120820 249 12.1- 17.9- Y 210208 T14 0.0 0.0 210303 568 0.1+ 0.0 120820 249 27.0- 15.7- Y 210210 T14 0.2- 0.1- 210303 568 0.1+ 0.1+ 120820 249 9.0- 18.9+ Y 210210 T14 0.1- 0.1- 210303 568 0.1- 0.0 120820 249(0.03+ 0.07-)Y 210210 T14 0.2- 0.1- 210303 568 0.2+ 0.0 120820 249 28.9- 13.0- Y 210211 T14 0.2- 0.1- 210303 568 0.2+ 0.0 120820 249(44.6- 28.5-)Y 210211 T14 0.0 0.1- 210303 568 0.0 0.1- 120820 249 20.1- 8.4+ Y 210211 T14 0.0 0.0 210303 568 0.1- 0.0 120820 249 3.5- 8.6+ Y 210211 T14 0.1+ 0.0 210303 568 0.0 0.0 120820 249(0.04+ 0.02-)Y 210212 T14 0.1- 0.1- 210303 568 0.0 0.0 120820 249(49.7+ 10.8-)Y 210212 T14 0.2- 0.1- 210303 568 0.1+ 0.0 120820 249 (1.8+ 40.7-)Y 210212 T14 0.2- 0.1- 210303 568 0.0 0.0 120820 249 13.7- 2.1+ Y 210213 T14 0.1- 0.0 210303 568 0.0 0.0 120820 249(17.5+ 47.0-)Y 210213 T14 0.0 0.1- 210303 250 0.3- 0.1- 120820 249 15.2- 8.6- Y 210213 T14 0.1- 0.0 210303 250 0.1- 0.1- 120820 249(42.2+ 28.8-)Y 210213 568 0.0 0.1- 210303 250 0.1- 0.1- 2016/ 210213 568 0.0 0.0 210303 250 0.0 0.1- 161123 249(52.1- 9.1+)Y 210213 568 0.0 0.1- 210303 250 0.1+ 0.0 161123 249(49.9- 13.9+)Y 210213 568 0.2- 0.3- 210322 250 0.3- 0.0 161123 249(39.4- 2.5-)Y 210213 568 0.2- 0.1- 210322 250 0.2- 0.1- 161123 249(39.5- 3.7+)Y 210213 568 0.1- 0.1- 210322 250 0.2- 0.1- 161123 249(48.9- 12.8+)Y 210213 568 0.2- 0.1- 210322 250 0.1- 0.1- 161123 249(48.6- 1.6+)Y 210213 568 0.1- 0.1- 210322 250 0.0 0.1- 161123 249(46.7- 9.1+)Y 210213 568 0.1- 0.0 210326 250 0.3- 0.0 161123 249(45.0- 2.3+)Y 210213 568 0.1- 0.1- 210326 250 0.2- 0.1- 161123 249(53.5- 5.3+)Y 210213 568 0.0 0.0 210326 250 0.2- 0.1- 161123 249(41.3- 4.9+)Y 210213 568 0.1- 0.0 210326 250 0.0 0.1- 161123 249(47.3- 4.3+)Y 210213 568 0.1+ 0.1- 210326 250 0.0 0.1- 161123 249(42.7- 9.4+)Y 210216 G37 0.3+ 0.3+ 2025/ 161123 249(50.2- 4.1+)Y 210216 G37 0.3+ 0.1+ 250127 V06 0.7- 0.4+ 161123 249(44.4- 2.5+)Y 210216 G37 0.0 0.0 250127 V06 0.6- 0.3+ 161123 249(46.6- 7.6+)Y 210216 G37 0.4+ 0.1+ 250127 V06 0.8- 0.5+ 161123 249(45.2- 1.4+)Y 210216 G37 0.2+ 0.1+ 250201 J04 0.3- 0.5- 161123 249(45.6- 3.8+)Y 210217 T14 0.1- 0.0 250205 Z84 0.2- 0.4- 161123 249(43.6- 5.5+)Y 210217 T14 0.1- 0.1- 250205 Z84 0.6+ 0.8+ 161123 249(47.1- 6.8+)Y 210217 T14 0.0 0.1- 250205 Z84 0.1- 0.2+ 161123 249(39.9- 7.7+)Y 210302 250 0.2- 0.1- 250205 V06 0.0 0.1+ 161123 249(50.2- 13.2+)Y 210302 250 0.0 0.1- 250205 V06 0.6- 0.1+ 161123 249(43.8- 4.3+)Y 210302 250 0.0 0.1- 250205 V06 0.0 0.5- 161123 249(45.0- 2.0+)Y 210302 250 0.0 0.0 250205 V06 0.3+ 0.6- 161123 249(40.7- 17.2+)Y 210302 250 0.2+ 0.0 250206 I52 0.0 0.2- 161123 249(38.2- 9.1+)Y 210303 G37 0.2+ 0.1+ 250206 I52 0.1- 0.2+ 161123 249(14.9- 85.8+)Y 210303 G37 0.2+ 0.0 250206 I52 0.5+ 0.2+ 161123 249(10.0- 41.1+)Y 210303 G37 0.1+ 0.2+ 250206 V06 0.3- 0.7+ 161123 249(39.9- 34.0+)Y 210303 G37 0.1+ 0.1- 250206 V06 0.0 0.1- 161123 249(37.0- 23.7-)Y 210303 G37 0.1+ 0.1+ 250206 V06 0.1- 0.1- 161123 249(73.3- 39.1+)Y 210303 G37 0.2+ 0.1+ 250206 V06 0.1+ 0.3+ 161123 249(50.2- 35.4+)Y 210303 G37 0.1+ 0.1+ 250207 I52 0.2+ 0.3- 161123 249(53.6- 3.2-)Y 210303 G37 0.0 0.0 250207 I52 0.4+ 0.3+ 161123 249 3.0- 20.1- Y 210303 G37 0.0 0.1+ 250207 I52 0.4+ 0.8- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2025 Feb. 16