Nakano Note (Nakano wa Kangaeru noda) NK 3979 P/2009 Q1 (Hill)
The following improved orbital elements, by S. Nakano, are from 124 observations 2009 Aug. 16 to Nov. 11. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.70 arc second. See the previous orbit in HICQ 2010. Epoch = 2009 June 18.0 TT T = 2009 July 4.15819 +/- 0.04335 (m.e.) TT Peri. = 157.93473 +/- 0.01078 Node = 174.08903 +/- 0.00025 (2000.0) Inc. = 14.43897 +/- 0.00107 q = 2.7898923 +/- 0.0000777 AU e = 0.4968964 +/- 0.0000357 a = 5.5453632 +/- 0.0004216 AU n' = 0.07547604 +/- 0.00000864 P = 13.059 +/- 0.0014882 years (+/- 0.54 day) The predicted orbit for the 2022 return is as follows: If 1996/1998 observations are identical with this comet, predicted-T will be 2022 May 22.75 TT. T = 2022 May 23.63118 TT Epoch = 2022 May 21.0 TT Peri. = 157.09491 e = 0.4960375 Node = 173.95139 (2000.0) a = 5.5333324 AU Inc. = 14.50621 n'= 0.07572232 q = 2.7885921 AU P = 13.016 years Trying to link with 1998 and 2009 observations, residuals on 1996 observations are shown as 1996 07 15.57082 ( 0.03- 0.00-) 566 1996 07 15.59109 ( 0.03- 0.00-) 566 1996 07 15.60927 ( 0.03- 0.00-) 566 1998 01 26.28748 2.1- 1.0+ 566 1998 02 26.24634 2.2+ 1.8+ 566 On the other hand, trying to link with 1996 and 2009 observations, residuals on 1998 observations are shown as 1996 07 15.57082 0.0 1.9- 566 1996 07 15.59109 0.3+ 1.5- 566 1996 07 15.60927 0.2+ 1.5- 566 1998 01 26.28748 (18.8+ 7.3+) 566 1998 02 26.24634 (17.4+ 6.1+) 566 However when including 1996 and 1998 observations together, the residuals on 2009 observations are slightly bad than shown below. The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1996/ 090829 H06 0.3- 0.1- 090917 G96 0.5- 0.1- 960715 566(0.39- 0.05-) 090829 703 0.6+ 1.2+ 090918 213 0.3+ 0.5- 960715 566(0.39- 0.05-) 090829 H06 0.4- 0.2- 090918 213 0.7+ 0.8- 960715 566(0.39- 0.05-) 090829 H10 0.1- 1.2- 090918 213 0.3+ 0.3- 1998/ 090829 H06 1.5- 0.3+ 090919 G96 0.4+ 0.3- 980126 566(0.11- 0.01-) 090829 703 1.3- 0.4+ 090919 G96 0.6+ 0.1+ 980226 566(0.09- 0.01-) 090829 H36 0.1- 0.7- 090919 G96 0.7+ 0.3+ 2009/ 090829 H36 0.3- 0.9- 090919 G96 0.8+ 0.1- 090816 691 0.2+ 0.4+ 090829 704 1.4+ 0.4+ 090919 204 0.5- 0.2- 090816 691 0.8- 0.1- 090829 703 0.1- 0.5- 090919 204 0.1+ 0.2+ 090816 691 1.1- 0.2- 090829 703 1.5- 0.5+ 090920 H06 0.7+ 0.5+ 090827 703 (2.9- 2.7+) 090829 704 (0.3+ 2.3-) 090920 H06 0.0 0.9+ 090827 703 (3.1- 0.3-) 090829 703 0.4- 0.4+ 090920 H06 0.7- 0.6+ 090827 703 0.7- 1.3+ 090829 703 (2.0- 0.9-) 090920 900 0.0 1.5+ 090827 703 (3.2- 0.3+) 090829 704 0.4- 0.2- 090920 900 1.2- 0.2- 090827 703 0.7- 1.3+ 090829 704 0.4- 0.1- 090921 585 1.6+ 1.9- 090827 703 (2.1- 0.0 ) 090829 A71 (0.2+ 2.2-) 090921 585 1.1+ 0.0 090827 703 (2.5- 0.5-) 090829 585 (2.6+ 0.8+) 090921 585 0.5+ 1.2- 090827 703 0.8- 0.2- 090830 585 (3.6+ 0.0 ) 090921 585 0.1+ 0.4- 090828 204 0.6+ 0.0 090831 H45 0.0 0.2+ 090921 585 0.5- 0.7- 090828 204 0.8+ 0.4+ 090831 H45 0.5- 0.5- 090923 130 0.9- 0.3- 090828 118 0.0 0.5+ 090831 H45 0.3- 0.6- 090924 A77 1.5+ 1.6+ 090828 118 (1.8+ 2.0-) 090831 H45 0.2- 0.9+ 090924 A77 0.6+ 1.2+ 090828 H06 1.0+ 0.2- 090831 H45 (0.2+ 2.2+) 090924 A77 1.7- 1.5+ 090828 H06 0.2- 1.0- 090831 H45 (1.4- 2.6+) 090924 A32 1.3- 1.3+ 090828 H36 0.5- 0.5- 090831 215 0.6- 0.2- 090924 A32 0.4- 0.4+ 090828 703 (2.5- 1.0-) 090831 215 1.7+ 0.4+ 090924 A32 (0.7+ 2.6+) 090828 H36 0.0 1.2- 090831 215 (2.1+ 0.7+) 090925 585 0.7- 0.9- 090828 703 (2.3- 0.2-) 090910 703 0.1+ 0.2+ 090925 585 0.3- 0.4+ 090828 H36 1.0+ 0.3- 090910 703 0.8- 0.3- 090928 850 (2.9+ 1.1-) 090828 703 (2.0- 1.1+) 090910 703 0.0 0.8- 090928 850 0.3- 0.3+ 090828 703 1.2- 0.4+ 090910 703 0.2- 1.2- 090928 645 0.4+ 0.1+ 090828 H06 0.7- 0.8- 090910 585 0.4- 0.5- 090928 645 0.4+ 0.1- 090828 H06 0.5- 0.9- 090910 585 0.9+ 0.4+ 090928 645 0.0 1.6- 090828 H06 0.2- 0.5+ 090910 B42 0.0 0.2- 091015 645 0.1+ 0.3- 090828 H06 0.0 0.2+ 090911 160 0.2- 0.7+ 091015 645 0.0 0.5- 090828 H06 0.5- 0.2+ 090912 213 0.0 0.2- 091015 645 0.2- 0.6- 090828 349 1.4+ 0.2- 090912 213 0.0 0.3- 091016 645 0.1- 0.2- 090828 349 1.7+ 0.2+ 090912 B90 (3.1- 3.1-) 091016 645 0.1- 0.2- 090828 J87 0.3+ 0.1- 090913 A77 1.5+ 1.0+ 091016 645 0.2- 0.4- 090828 J87 0.5+ 0.1+ 090913 A77 1.6+ 1.3- 091022 291 0.2- 0.7+ 090828 J87 0.6+ 0.4+ 090913 A77 0.2- 0.0 091022 291 0.0 0.3+ 090828 176 0.3+ 0.4+ 090913 J24 1.0+ 1.2- 091022 291 0.3- 0.1+ 090828 176 1.4+ 0.1+ 090914 J24 1.7- 0.0 091024 G96 1.3- 0.6+ 090828 176 0.6+ 0.4+ 090914 J24 0.9+ 0.2- 091024 G96 0.5+ 0.5+ 090828 176 0.7+ 1.0+ 090915 H10 0.6- 0.3+ 091024 G96 0.5- 0.3+ 090829 A79 1.0+ 0.1+ 090915 H10 0.3+ 0.1- 091024 G96 0.3- 0.1- 090829 A79 0.1+ 0.6+ 090916 A32 0.9+ 0.6- 091025 204 0.3+ 0.5+ 090829 H10 (2.4+ 1.0+) 090916 A32 (1.5- 2.1+) 091026 850 (2.7- 0.5+) 090829 H10 0.8- 1.6+ 090917 G96 0.1- 0.3- 091026 850 0.5- 0.0 090829 703 0.6- 0.5- 090917 G96 0.3+ 0.3- 091111 A77 (0.7- 2.8+) 090829 703 0.7- 0.3+ 090917 G96 0.1+ 0.2+ 091111 A77 0.6+ 0.1- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2019 Dec. 14