OAA computing section circular NK 1674 202P/2001 X2 = 1929 WW = 2008 R2 (Scotti) [Temporary numbered]
The following improved orbital elements, by S. Nakano, are from 134 observations 1929 to 2008. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.68 arc second. See orbits on MPC 44184, MPC 44861, NK 879 (= MPC 56802) and NK 1070 (= YC 2431). The comet has passed 0.67 AU from Jupiter on 1960 Mar. 24. The delta-T corrections are -0.15 day from the prediction in NK 879 and -0.015 day from the prediction in NK 1070 (= YC 2431). Epoch = 2009 Feb. 18.0 TT T = 2009 Feb. 7.00621 +/- 0.00083 (m.e.) TT Peri. = 255.55531 +/- 0.00117 Node = 194.58033 +/- 0.00117 (2000.0) Inc. = 2.18494 +/- 0.00001 q = 2.5270720 +/- 0.0000032 AU e = 0.3308134 +/- 0.0000008 a = 3.7763341 +/- 0.0000018 AU n' = 0.13430694 +/- 0.00000009 P = 7.338 +/- 0.0000052 years T = 1930 Jan. 8.73851 TT Epoch = 1930 Jan. 24.0 TT Peri. = 236.12955 e = 0.3783721 Node = 212.18684 (2000.0) a = 3.6051577 AU Inc. = 2.33602 n'= 0.14398514 q = 2.2410667 AU P = 6.845 years [ T = 1936 Nov. 11.08363 TT Epoch = 1936 Nov. 8.0 TT Peri. = 236.04391 e = 0.3763098 Node = 212.10207 (2000.0) a = 3.6091359 AU Inc. = 2.33392 n'= 0.14374714 q = 2.2509828 AU P = 6.857 years ] [ T = 1943 Sept.15.25947 TT Epoch = 1943 Oct. 3.0 TT Peri. = 236.03700 e = 0.3783918 Node = 212.10823 (2000.0) a = 3.6001738 AU Inc. = 2.33722 n'= 0.14428423 q = 2.2378974 AU P = 6.831 years ] [ T = 1950 July 3.47686 TT Epoch = 1950 July 18.0 TT Peri. = 235.85540 e = 0.3829370 Node = 211.94845 (2000.0) a = 3.5856804 AU Inc. = 2.34661 n'= 0.14515992 q = 2.2125908 AU P = 6.790 years ] [ T = 1957 Apr. 20.97843 TT Epoch = 1957 May 2.0 TT Peri. = 236.08564 e = 0.3835526 Node = 211.86847 (2000.0) a = 3.5841299 AU Inc. = 2.34886 n'= 0.14525412 q = 2.2094276 AU P = 6.785 years ] [ T = 1964 Aug. 7.27976 TT Epoch = 1964 July 24.0 TT Peri. = 254.11091 e = 0.3121632 Node = 196.22521 (2000.0) a = 3.8433919 AU Inc. = 2.14575 n'= 0.13080733 q = 2.6436262 AU P = 7.535 years ] [ T = 1972 Feb. 23.80130 TT Epoch = 1972 Feb. 13.0 TT Peri. = 254.18413 e = 0.3102978 Node = 196.15491 (2000.0) a = 3.8527848 AU Inc. = 2.14421 n'= 0.13032927 q = 2.6572740 AU P = 7.562 years ] [ T = 1979 Sept. 9.98060 TT Epoch = 1979 Sept. 4.0 TT Peri. = 254.21331 e = 0.3120481 Node = 196.15065 (2000.0) a = 3.8400376 AU Inc. = 2.14721 n'= 0.13097875 q = 2.6417613 AU P = 7.525 years ] [ T = 1987 Feb. 20.60450 TT Epoch = 1987 Feb. 14.0 TT Peri. = 255.89575 e = 0.3322421 Node = 194.82554 (2000.0) a = 3.7665267 AU Inc. = 2.18548 n'= 0.13483185 q = 2.5151281 AU P = 7.310 years ] [ T = 1994 June 22.90098 TT Epoch = 1994 June 17.0 TT Peri. = 256.28275 e = 0.3310002 Node = 194.68741 (2000.0) a = 3.7734227 AU Inc. = 2.18562 n'= 0.13446241 q = 2.5244191 AU P = 7.330 years ] T = 2001 Oct. 14.74528 TT Epoch = 2001 Oct. 18.0 TT Peri. = 255.92248 e = 0.3318271 Node = 194.66352 (2000.0) a = 3.7774391 AU Inc. = 2.18432 n'= 0.13424801 q = 2.5239823 AU P = 7.342 years The predicted orbit for the 2016 return is as follows: T = 2016 June 11.00836 TT Epoch = 2016 June 21.0 TT Peri. = 255.74094 e = 0.3319944 Node = 194.52512 (2000.0) a = 3.7699049 AU Inc. = 2.18824 n'= 0.13465066 q = 2.5183176 AU P = 7.320 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1929/ 011221 170 (0.2+ 2.3-) 020119 704 0.5+ 0.1+ 291127 690(20.6+ 11.7-)Y 011221 170 0.4- 0.0 020119 704 0.7+ 1.2+ 291203 690 0.0 0.5- 011222 204 (1.0- 2.1-) 020119 704 0.7+ 0.6+ 2001/ 011222 204 0.2- 0.1+ 020124 691 0.4- 0.4+ 011214 691 1.3- 0.2- 011222 204 0.4- 0.0 020124 691 0.8+ 0.2+ 011214 704 0.5+ 0.6- 011222 372 0.2+ 1.2- 020124 691 0.7+ 0.0 011214 704 0.5+ 0.9- 011222 372 0.1- 1.9- 020201 360 0.6+ 0.4- 011214 691 1.2- 0.8- 011225 291 0.1+ 1.9+ 020201 360 0.3+ 0.1- 011214 704 0.3- 0.2- 011225 291 0.0 1.7+ 020201 402 1.1+ 0.6- 011214 691 0.8- 0.5- 011225 291 0.0 1.6+ 020201 402 0.4- 0.0 011214 704 0.5+ 0.7+ 2002/ 020201 402 1.2- 0.2+ 011214 046 1.4- 0.3+ 020104 691 0.7- 0.1+ 020204 608 0.8- 0.9+ 011214 046 0.1+ 1.0+ 020104 691 0.5- 0.2- 020204 608 0.0 1.0+ 011214 046 0.0 1.5+ 020104 691 0.1- 0.2- 020204 608 0.5- 0.3+ 011214 046 1.2- 0.0 020104 046 0.5+ 0.7- 020206 644 0.7+ 0.6+ 011214 046 (2.2- 0.3+) 020104 046 1.1- 0.5- 020206 644 0.7+ 0.6+ 011214 611 1.0- 0.1+ 020104 046 0.8+ 0.7- 020206 644 0.3+ 0.7+ 011215 611 1.0- 0.1- 020104 046 0.4- 0.3- 020207 704 1.7+ 0.1+ 011217 734 1.8- 1.4- 020105 608 0.7+ 0.8- 020207 704 0.1+ 0.1+ 011217 333 0.2+ 1.4- 020105 608 0.1+ 0.2+ 020207 704 0.2+ 0.4- 011217 333 0.1- 0.5- 020105 608 0.4+ 0.5+ 020211 704 0.1- 0.6- 011217 333 0.6- 0.6+ 020108 291 0.5+ 2.0+ 020211 704 0.1+ 1.0- 011217 734 0.4- 0.5- 020108 291 0.6+ 1.2+ 020211 704 0.6+ 1.1- 011217 691 (0.9+ 2.5+) 020109 704 0.6+ 0.2- 020214 691 0.5+ 0.3+ 011217 691 (1.1+ 2.1+) 020109 704 1.4- 0.1- 020214 691 1.5+ 0.2- 011217 691 (0.4+ 2.7+) 020109 704 0.4- 0.4- 020215 691 0.8+ 0.5- 011217 704 0.1+ 1.2+ 020109 704 1.4- 0.2- 020215 691 1.0+ 0.6- 011217 704 0.0 0.0 020109 704 0.6- 0.7- 020215 691 0.9+ 0.7- 011217 704 0.3+ 0.8+ 020111 360 0.0 0.3- 020216 046 1.3+ 0.2- 011217 704 1.0- 0.0 020111 360 0.3+ 0.1- 020216 046 0.7+ 0.4- 011218 734 0.5- 1.3+ 020113 704 0.1- 0.4+ 020216 046 0.8+ 0.0 011218 691 0.5- 0.0 020113 704 0.9- 0.3+ 020318 691 1.3+ 0.5+ 011218 691 0.6- 0.1- 020113 704 0.4- 0.6+ 020318 691 (2.7+ 1.1+) 011218 734 0.3- 0.8- 020113 704 1.0- 0.4+ 2007/ 011218 691 0.0 0.0 020113 704 0.4- 1.4+ 070913 G96 0.7- 0.4- 011218 360 0.5+ 0.2- 020115 704 0.4+ 0.4- 070913 G96 0.4- 0.5+ 011218 360 0.4- 0.3- 020115 704 0.7+ 0.6- 070913 G96 0.3+ 0.7+ 011218 360 0.9- 0.6- 020115 704 0.0 0.9- 070913 G96 0.5- 0.2- 011218 104 0.0 0.3- 020116 608 0.1+ 0.1+ 071008 G96 0.8+ 0.6- 011218 104 0.4- 0.4- 020116 608 0.3+ 0.0 071008 G96 1.1+ 0.4+ 011218 104 1.1- 0.4- 020116 608 0.1+ 0.8- 071008 G96 0.2- 1.0+ 011218 104 (4.4- 0.6-) 020117 046 0.4+ 0.7+ 071008 G96 0.4- 0.2+ 011219 691 0.2+ 0.2- 020117 046 1.3+ 0.5+ 2008/ 011219 691 0.5+ 0.7- 020117 046 0.3+ 0.4+ 080807 691 0.9+ 0.0 011219 691 0.6+ 0.8- 020117 046 0.2- 0.0 080807 691 0.1+ 0.3- 011220 704 0.5- 0.8+ 020118 704 0.8+ 0.4+ 080807 691 (2.4- 0.1+) 011220 704 0.1- 0.3- 020118 704 0.3+ 0.5- 080905 291 0.0 0.3+ 011220 704 0.4+ 0.4+ 020118 704 0.1+ 0.0 080905 291 0.3+ 0.2+ 011220 704 1.1- 0.9+ 020118 704 0.3+ 0.5- 080905 291 0.1+ 0.2+ 011220 704 0.9- 0.3+ 020119 704 0.0 0.5+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2008 Sept. 7