OAA computing section circular NK 1301 C/2005 P3 (SWAN)

The following improved orbital elements, by S. Nakano, are from 76 observations 2005 Aug. 24 to Oct. 26. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 1.13 arc seconds. Epoch = 2005 Aug. 18.0 TT T = 2005 Aug. 9.74572 +/- 0.00024 (m.e.) TT Peri. = 32.14427 +/- 0.00167 Node = 242.77878 +/- 0.00052 (2000.0) Inc. = 89.70543 +/- 0.00182 q = 0.5257556 +/- 0.0000153 AU e = 0.9876535 +/- 0.0000661 a = 42.5833 +/- 0.0054 AU P = 277.9 +/- 0.052 years (+/-19.1 days) Nearest past return is as follows. Note Comet 1748 H1 has some similar orbit. T = 1739 Mar. 5.25289 TT Epoch = 1739 Mar. 6.0 TT Peri. = 31.99102 e = 0.9868926 Node = 242.86430 (2000.0) a = 39.6235 AU Inc. = 90.29876 n'= 0.00395162 q = 0.5193607 AU P = 249 years The predicted orbit for the 2284 return is as follows: T = 2284 Jan. 29.90164 TT Epoch = 2284 Feb. 17.0 TT Peri. = 32.19591 e = 0.9877943 Node = 242.87595 (2000.0) a = 42.8731 AU Inc. = 89.66306 n'= 0.00351097 q = 0.5232978 AU P = 280 years The following residuals in seconds of arc (or two decimals in units of degrees) are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2005/ 050827 A79 (2.7- 3.6+) 050903 232 0.7- 1.6- 050804 249(1.29+ 2.50+) 050828 A77 (4.0+ 0.1+) 050903 J76 0.0 0.8- 050807 249(0.01- 1.08+) 050828 A77 0.4+ 1.6- 050903 J76 0.6+ 1.0- 050809 249(0.00- 0.78+) 050828 A77 2.3+ 1.7- 050903 J76 0.2+ 1.1- 050814 249(0.18+ 1.13+) 050829 147 0.2- 0.6+ 050903 232 0.8+ 1.8- 050816 249(0.05+ 0.82+) 050829 147 0.0 1.1+ 050905 A32 0.8- 0.7- 050818 249(0.08+ 0.99+) 050829 147 0.8- 1.2+ 050905 A32 0.7- 0.8+ 050821 249(0.07- 0.79+) 050829 147 0.5- 1.2+ 050905 A32 1.2+ 0.6+ 050824 620 (8.8+ 5.6+) 050829 147 1.1- 0.4+ 050905 A32 (2.4- 2.6-) 050824 620 0.8- 2.3- 050829 147 0.6- 1.2+ 050905 A32 0.3- 0.2+ 050824 620 1.0+ 2.3- 050829 147 1.2- 0.3+ 050907 A77 (0.0 3.0-) 050826 854 0.4+ 0.7+ 050829 147 0.5- 0.1+ 050907 A77 (0.8+ 4.3-) 050826 854 0.3+ 0.2+ 050829 147 0.9- 0.5- 050907 A77 0.7+ 0.8- 050826 349 0.8- 0.7+ 050829 213 1.5+ 0.7+ 050910 232 2.4- 0.0 050826 349 0.3- 1.5- 050829 213 0.7+ 0.0 050911 349 1.7- 0.2+ 050826 349 0.7- 0.8- 050829 213 1.1+ 1.2+ 050911 349 1.8- 1.7- 050826 864 0.0 0.5+ 050830 147 1.0- 0.8- 050911 213 0.9- 0.4+ 050826 864 1.5- 1.3- 050830 147 0.5+ 1.5- 050912 D83 1.5- 0.8- 050826 J87 0.3+ 1.3+ 050830 147 0.2+ 0.6+ 050913 204 0.8- 0.4+ 050826 J87 0.5+ 1.4+ 050830 147 1.5+ 0.3+ 050913 204 0.1+ 0.2- 050826 J87 0.3- 0.9+ 050830 147 0.7- 0.2- 050920 A32 (4.7- 1.4-) 050827 651 2.1+ 1.7- 050830 147 0.0 0.2+ 050920 A32 (3.7- 1.3-) 050827 651 (2.8+ 1.8-) 050830 204 0.4- 0.5+ 050922 A32 1.0- 0.9+ 050827 651 2.4+ 1.8- 050830 204 0.1- 0.8+ 050924 A32 1.4- 2.3- 050827 651 1.3+ 1.5- 050830 204 0.6+ 0.6+ 050924 A32 1.4+ 0.6+ 050827 651 1.8+ 1.9- 050830 204 0.2- 1.0+ 051004 A32 0.1- 0.9- 050827 D70 0.4- 1.6+ 050830 A32 0.3- 0.1+ 051026 649 2.2+ 0.5- 050827 D70 1.3- 1.1+ 050830 A32 1.5+ 0.9+ 051026 649 1.7+ 2.0- 050827 D70 1.0- 2.0+ 050830 A32 0.6- 0.4+ 051026 649 (6.3+ 3.8+) 050827 D70 0.2- 2.2+ 050902 213 2.2+ 1.5+ 051026 649 0.1+ 1.0+ 050827 A79 (1.2+ 2.9+) 050902 213 0.7+ 1.0+ 051026 649 0.5- 1.5+ 050827 A79 (3.4- 4.8+) 050902 213 0.2+ 1.3+ 051026 649 1.9- 2.1+ ( ) -------- Rejected Obs.

Director, Computing Section Syuichi Nakano 2006 Feb. 28

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