Nakano Note (Nakano wa Kangaeru noda) NK 4474 420P/Hill
The following improved orbital elements, by S. Nakano, are from 151 observations 1996 to 2021, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of sublimating molecule = CO (or N2) using Yabushita's theory (MN 283, 347). The mean residual is +/- 1.18 arc seconds. Residuals on 2021 May observations were +20" for Right Ascension and +9" for Declination from a recent linked orbit in NK 4399 (= CBET 4943) with the delta-T correction = -0.03 day. See the orevious orbits in NK 3979 (= HICQ 2021) and NK 4399. Epoch = 2022 May 21.0 TT T = 2022 May 22.41405 +/- 0.01711 (m.e.) TT Peri. = 157.06801 +/- 0.00242 Node = 173.95146 +/- 0.00010 (2000.0) Inc. = 14.50426 +/- 0.00010 q = 2.7885474 +/- 0.0000314 AU e = 0.4957781 +/- 0.0000169 a = 5.5303971 +/- 0.0000354 AU n' = 0.07578262 +/- 0.00000073 P = 13.006 +/- 0.0001249 years Y1 = +9.265 +/- 0.778 Y2 = -0.04846 +/- 0.00511 (+/- 0.05 day) T = 1996 Sept.16.25050 TT Epoch = 1996 Oct. 4.0 TT Peri. = 159.15010 e = 0.4968230 Node = 174.31262 (2000.0) a = 5.4834046 AU Inc. = 14.45135 n'= 0.07675888 q = 2.7591229 AU P = 12.840 years T = 2009 July 4.28643 TT Epoch = 2009 June 18.0 TT Peri. = 157.96744 e = 0.4966356 Node = 174.08931 (2000.0) a = 5.5423214 AU Inc. = 14.43703 n'= 0.07553818 q = 2.7898071 AU P = 13.048 years The predicted orbit for the 2035 return is as follows: T = 2035 Feb. 10.54778 TT Epoch = 2035 Feb. 2.0 TT Peri. = 156.28578 e = 0.4936923 Node = 173.10562 (2000.0) a = 5.4574153 AU Inc. = 14.60348 n'= 0.07730784 q = 2.7631315 AU P = 12.749 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1996/ 090829 703 2.4- 0.3+ 090920 H06 1.3+ 0.8+ 960715 566 0.1+ 2.4- 090829 H36 1.2- 0.8- 090920 H06 0.6+ 1.2+ 960715 566 0.3+ 2.0- 090829 H36 1.4- 1.0- 090920 H06 0.1- 0.9+ 960715 566 0.3+ 2.0- 090829 704 0.3+ 0.3+ 090920 900 0.6+ 1.9+ 1998/ 090829 703 1.2- 0.7- 090920 900 0.5- 0.1+ 980126 566(63.7- 7.1+) 090829 703 2.6- 0.4+ 090921 585 2.4+ 1.5- 980226 566(59.7- 4.3+) 090829 704 0.8- 2.4- 090921 585 1.8+ 0.4+ 2009/ 090829 703 1.5- 0.3+ 090921 585 1.2+ 0.9- 090816 691 1.6- 0.4+ 090829 703 (3.1- 1.0-) 090921 585 0.9+ 0.1- 090816 691 2.6- 0.1- 090829 704 1.6- 0.3- 090921 585 0.3+ 0.3- 090816 691 2.9- 0.2- 090829 704 1.5- 0.2- 090923 130 0.1+ 0.1+ 090827 703 (4.2- 2.6+) 090829 A71 0.9- 2.3- 090924 A77 2.5+ 2.0+ 090827 703 (4.4- 0.4-) 090829 585 1.5+ 0.6+ 090924 A77 1.6+ 1.6+ 090827 703 1.9- 1.2+ 090830 585 2.5+ 0.1- 090924 A77 0.6- 1.9+ 090827 703 (4.4- 0.2+) 090831 H45 1.1- 0.1+ 090924 A32 0.3- 1.8+ 090827 703 2.0- 1.2+ 090831 H45 1.5- 0.6- 090924 A32 0.7+ 0.9+ 090827 703 (3.4- 0.1-) 090831 H45 1.3- 0.7- 090924 A32 (1.7+ 3.1+) 090827 703 (3.7- 0.6-) 090831 H45 1.2- 0.8+ 090925 585 0.4+ 0.4- 090827 703 2.0- 0.3- 090831 H45 0.8- 2.1+ 090925 585 0.8+ 0.9+ 090828 204 0.6- 0.1- 090831 H45 2.4- 2.5+ 090928 850 (4.2+ 0.5-) 090828 204 0.5- 0.3+ 090831 215 1.6- 0.2- 090928 850 1.0+ 0.8+ 090828 118 1.2- 0.4+ 090831 215 0.7+ 0.3+ 090928 645 1.7+ 0.7+ 090828 118 0.6+ 2.1- 090831 215 1.1+ 0.6+ 090928 645 1.7+ 0.5+ 090828 H06 0.2- 0.3- 090910 703 0.1- 0.2+ 090928 645 1.3+ 1.1- 090828 H06 1.4- 1.1- 090910 703 1.0- 0.3- 091015 645 2.4+ 0.7+ 090828 H36 1.7- 0.6- 090910 703 0.2- 0.7- 091015 645 2.4+ 0.6+ 090828 703 (3.7- 1.2-) 090910 703 0.5- 1.1- 091015 645 2.2+ 0.4+ 090828 H36 1.2- 1.3- 090910 585 0.6- 0.5- 091016 645 2.2+ 0.8+ 090828 703 (3.5- 0.3-) 090910 585 0.7+ 0.4+ 091016 645 2.3+ 0.8+ 090828 H36 0.2- 0.4- 090910 B42 0.1- 0.1- 091016 645 2.2+ 0.6+ 090828 703 (3.2- 1.0+) 090911 160 0.3- 0.7+ 091022 291 2.4+ 1.8+ 090828 703 2.4- 0.3+ 090912 213 0.1- 0.1- 091022 291 2.5+ 1.4+ 090828 H06 1.9- 0.9- 090912 213 0.1- 0.2- 091022 291 2.2+ 1.2+ 090828 H06 1.7- 1.0- 090912 B90 (3.1- 3.0-) 091024 G96 1.2+ 1.7+ 090828 H06 1.4- 0.4+ 090913 A77 1.6+ 1.1+ 091024 G96 (3.1+ 1.6+) 090828 H06 1.2- 0.1+ 090913 A77 1.7+ 1.1- 091024 G96 2.1+ 1.4+ 090828 H06 1.7- 0.1+ 090913 A77 0.2- 0.1+ 091024 G96 2.3+ 1.0+ 090828 349 0.2+ 0.3- 090913 J24 1.1+ 1.1- 091025 204 2.9+ 1.6+ 090828 349 0.6+ 0.1+ 090914 J24 1.6- 0.1+ 091026 850 0.1- 1.7+ 090828 J87 0.8- 0.2- 090914 J24 1.0+ 0.1- 091026 850 2.1+ 1.2+ 090828 J87 0.7- 0.0 090915 H10 0.4- 0.5+ 091111 A77 (1.6+ 3.8+) 090828 J87 0.5- 0.3+ 090915 H10 0.6+ 0.1+ 091111 A77 2.9+ 1.0+ 090828 176 0.9- 0.3+ 090916 A32 1.3+ 0.4- 2021/ 090828 176 0.2+ 0.0 090916 A32 1.2- 2.4+ 210311 Z84 0.4- 0.7- 090828 176 0.6- 0.3+ 090917 G96 0.3+ 0.1- 210311 Z84 0.8- 0.5+ 090828 176 0.5- 0.9+ 090917 G96 0.6+ 0.1- 210311 Z84 0.0 0.4- 090829 A79 0.2- 0.0 090917 G96 0.5+ 0.4+ 210311 Z84 0.9- 0.5+ 090829 A79 1.1- 0.5+ 090917 G96 0.2- 0.1+ 210314 J04 0.2- 0.5+ 090829 H10 1.3+ 0.9+ 090918 213 0.8+ 0.2- 210314 J04 0.4+ 1.1+ 090829 H10 1.9- 1.5+ 090918 213 1.2+ 0.6- 210314 J04 0.7+ 1.1+ 090829 703 1.7- 0.7- 090918 213 0.9+ 0.0 210510 G96 0.0 0.4+ 090829 703 1.9- 0.2+ 090919 G96 0.9+ 0.0 210510 G96 0.2+ 0.3+ 090829 H06 1.5- 0.3- 090919 G96 1.1+ 0.4+ 210510 G96 0.5+ 0.1- 090829 703 0.5- 1.1+ 090919 G96 1.3+ 0.6+ 210510 G96 0.0 0.1+ 090829 H06 1.5- 0.3- 090919 G96 1.4+ 0.2+ 210518 W62 0.3+ 1.4+ 090829 H10 1.2- 1.3- 090919 204 0.1+ 0.1+ 210518 W62 0.5- 1.1+ 090829 H06 2.7- 0.1+ 090919 204 0.7+ 0.5+ 210518 W62 0.3+ 1.3+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 June 14