OAA computing section circular NK 1070 Possible identification P/2001 X2 (Scotti) = 1929 WW
The following improved orbital elements, by S. Nakano, are from 122 observations 1929 to 2002. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.65 arc second. Identification with 1929 WW, which was found in 2001, is still possible. Because although there are two night observations in 1929, but the first night observation seems to be not better than approximate observation as follows. We can confirm the identification at the next return in 2009. See the prediction computed from 2001 appearance in NK 879 (HICQ 2003) which is given the predicted T = 2009 Feb. 7.12929 TT. Object Date/ UT R.A. (2000) Decl. *** O-C *** Code/Obs. h m s . , " " " 1929 WW 1929 11 27.25555 05 17.33 +20 20.9 (20.7+ 10.9-) 690/LW 1929 WW 1929 11 27.25556 05 17 35.21 +20 16 31.2 (237.4 +273.7-) 690/LW 1929 WW 1929 12 03.23610 05 13 06.20 +20 08 08.0 0.0 0.3+ 690/LW Epoch = 2001 Oct. 18.0 TT T = 2001 Oct. 14.77034 +/- 0.00985 (m.e.) TT Peri. = 255.93002 +/- 0.00438 Node = 194.66055 +/- 0.00227 (2000.0) Inc. = 2.18427 +/- 0.00003 q = 2.5238551 +/- 0.0000552 AU e = 0.3318591 +/- 0.0000125 a = 3.7774294 +/- 0.0000288 AU n' = 0.13424853 +/- 0.00000153 P = 7.342 +/- 0.0000838 years T = 1930 Jan. 8.74955 TT Epoch = 1930 Jan. 24.0 TT Peri. = 236.13885 e = 0.3783939 Node = 212.18189 (2000.0) a = 3.6051701 AU Inc. = 2.33595 n'= 0.14398440 q = 2.2409959 AU P = 6.845 years [ T = 1936 Nov. 11.10879 TT Epoch = 1936 Nov. 8.0 TT Peri. = 236.05327 e = 0.3763315 Node = 212.09710 (2000.0) a = 3.6091493 AU Inc. = 2.33386 n'= 0.14374634 q = 2.2509128 AU P = 6.857 years ] [ T = 1943 Sept.15.29816 TT Epoch = 1943 Oct. 3.0 TT Peri. = 236.04634 e = 0.3784135 Node = 212.10328 (2000.0) a = 3.6001865 AU Inc. = 2.33715 n'= 0.14428347 q = 2.2378275 AU P = 6.831 years ] [ T = 1950 July 3.52945 TT Epoch = 1950 July 18.0 TT Peri. = 235.86479 e = 0.3829582 Node = 211.94350 (2000.0) a = 3.5856933 AU Inc. = 2.34655 n'= 0.14515913 q = 2.2125228 AU P = 6.790 years ] [ T = 1957 Apr. 21.04463 TT Epoch = 1957 May 2.0 TT Peri. = 236.09502 e = 0.3835738 Node = 211.86352 (2000.0) a = 3.5841433 AU Inc. = 2.34880 n'= 0.14525330 q = 2.2093598 AU P = 6.785 years ] [ T = 1964 Aug. 7.34375 TT Epoch = 1964 July 24.0 TT Peri. = 254.11794 e = 0.3121970 Node = 196.22253 (2000.0) a = 3.8433872 AU Inc. = 2.14570 n'= 0.13080757 q = 2.6434934 AU P = 7.535 years ] [ T = 1972 Feb. 23.85908 TT Epoch = 1972 Feb. 13.0 TT Peri. = 254.19116 e = 0.3103314 Node = 196.15223 (2000.0) a = 3.8527791 AU Inc. = 2.14415 n'= 0.13032955 q = 2.6571407 AU P = 7.562 years ] [ T = 1979 Sept.10.03226 TT Epoch = 1979 Sept. 4.0 TT Peri. = 254.22033 e = 0.3120815 Node = 196.14797 (2000.0) a = 3.8400314 AU Inc. = 2.14715 n'= 0.13097907 q = 2.6416286 AU P = 7.525 years ] [ T = 1987 Feb. 20.64910 TT Epoch = 1987 Feb. 14.0 TT Peri. = 255.90320 e = 0.3322743 Node = 194.82259 (2000.0) a = 3.7665171 AU Inc. = 2.18543 n'= 0.13483237 q = 2.5150002 AU P = 7.310 years ] [ T = 1994 June 22.93520 TT Epoch = 1994 June 17.0 TT Peri. = 256.29018 e = 0.3310325 Node = 194.68444 (2000.0) a = 3.7734131 AU Inc. = 2.18557 n'= 0.13446292 q = 2.5242906 AU P = 7.330 years ] The predicted orbit for the 2009 return is as follows: T = 2009 Feb. 7.02343 TT Epoch = 2009 Feb. 18.0 TT Peri. = 255.56297 e = 0.3308452 Node = 194.57737 (2000.0) a = 3.7763263 AU Inc. = 2.18488 n'= 0.13430736 q = 2.5269469 AU P = 7.338 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1929/ 011220 704 0.2- 0.8+ 020116 608 0.0 0.7- 291127 690(20.7+ 10.9-)Y 011220 704 0.2+ 0.3- 020117 046 0.3+ 0.7+ 291203 690 0.0 0.3+ 011220 704 0.7+ 0.4+ 020117 046 1.1+ 0.5+ 2001/ 011220 704 0.8- 0.9+ 020117 046 0.2+ 0.5+ 011214 691 0.8- 0.3- 011220 704 0.6- 0.3+ 020117 046 0.3- 0.0 011214 704 1.0+ 0.7- 011221 170 (0.4+ 2.3-) 020118 704 0.7+ 0.4+ 011214 704 1.0+ 0.9- 011221 170 0.1- 0.0 020118 704 0.1+ 0.5- 011214 691 0.7- 0.8- 011222 204 (0.7- 2.1-) 020118 704 0.0 0.0 011214 704 0.2+ 0.3- 011222 204 0.1+ 0.1+ 020118 704 0.2+ 0.5- 011214 691 0.3- 0.6- 011222 204 0.2- 0.0 020119 704 0.1- 0.5+ 011214 704 1.0+ 0.6+ 011222 372 0.4+ 1.2- 020119 704 0.4+ 0.1+ 011214 046 0.9- 0.2+ 011222 372 0.2+ 1.9- 020119 704 0.5+ 1.3+ 011214 046 0.6+ 1.0+ 011225 291 0.2+ 1.9+ 020119 704 0.5+ 0.6+ 011214 046 0.5+ 1.5+ 011225 291 0.2+ 1.7+ 020124 691 0.6- 0.4+ 011214 046 0.7- 0.0 011225 291 0.2+ 1.6+ 020124 691 0.6+ 0.2+ 011214 046 1.7- 0.3+ 2002/ 020124 691 0.5+ 0.0 011214 611 0.5- 0.0 020104 691 0.7- 0.2+ 020201 360 0.3+ 0.5- 011215 611 0.5- 0.2- 020104 691 0.5- 0.2- 020201 360 0.0 0.2- 011217 734 1.4- 1.4- 020104 691 0.1- 0.2- 020201 402 0.9+ 0.7- 011217 333 0.6+ 1.5- 020104 046 0.5+ 0.7- 020201 402 0.7- 0.0 011217 333 0.3+ 0.5- 020104 046 1.1- 0.4- 020201 402 1.5- 0.2+ 011217 333 0.2- 0.6+ 020104 046 0.8+ 0.6- 020204 608 1.2- 0.8+ 011217 734 0.0 0.5- 020104 046 0.4- 0.3- 020204 608 0.3- 0.9+ 011217 691 (1.3+ 2.4+) 020105 608 0.7+ 0.7- 020204 608 0.8- 0.2+ 011217 691 (1.5+ 2.1+) 020105 608 0.1+ 0.2+ 020206 644 0.4+ 0.5+ 011217 691 (0.8+ 2.7+) 020105 608 0.3+ 0.6+ 020206 644 0.3+ 0.6+ 011217 704 0.4+ 1.2+ 020108 291 (0.5+ 2.0+) 020206 644 0.0 0.6+ 011217 704 0.4+ 0.1- 020108 291 0.5+ 1.2+ 020207 704 1.4+ 0.0 011217 704 0.7+ 0.8+ 020109 704 0.6+ 0.2- 020207 704 0.2- 0.0 011217 704 0.6- 0.0 020109 704 1.4- 0.1- 020207 704 0.2- 0.5- 011218 734 0.1- 1.3+ 020109 704 0.5- 0.3- 020211 704 0.5- 0.6- 011218 691 0.1- 0.0 020109 704 1.4- 0.1- 020211 704 0.4- 1.1- 011218 691 0.3- 0.1- 020109 704 0.6- 0.6- 020211 704 0.2+ 1.1- 011218 734 0.1+ 0.8- 020111 360 0.1- 0.2- 020214 691 0.0 0.2+ 011218 691 0.3+ 0.0 020111 360 0.2+ 0.1- 020214 691 1.0+ 0.2- 011218 360 0.8+ 0.2- 020113 704 0.2- 0.5+ 020215 691 0.2+ 0.6- 011218 360 0.0 0.4- 020113 704 1.0- 0.4+ 020215 691 0.4+ 0.7- 011218 360 0.5- 0.6- 020113 704 0.5- 0.6+ 020215 691 0.4+ 0.8- 011218 104 0.3+ 0.3- 020113 704 1.1- 0.4+ 020216 046 0.7+ 0.3- 011218 104 0.1- 0.4- 020113 704 0.4- 1.5+ 020216 046 0.0 0.5- 011218 104 0.7- 0.4- 020115 704 0.3+ 0.4- 020216 046 0.1+ 0.1- 011218 104 (4.0- 0.6-) 020115 704 0.6+ 0.5- 020318 691 0.8- 0.5+ 011219 691 0.6+ 0.2- 020115 704 0.1- 0.9- 020318 691 0.6+ 1.0+ 011219 691 0.8+ 0.7- 020116 608 0.0 0.1+ 011219 691 1.0+ 0.8- 020116 608 0.2+ 0.1+ ( ) -------- Rejected Obs.
Director, Computing Section Syuichi Nakano 2004 July 1