Nakano Note (Nakano wa Kangaeru noda) NK 3012 330P/Catalina (1999 V1 = 2015 U1)

The following improved orbital elements, by S. Nakano, are from 104 observations 1999 to 2015. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.71 arc second. The residuals of the recovery observations on 2015 Oct. were +656" for R.A and +18" for Decl. from the prediction in NK 761 (= HICQ 2014) with the delta-T correction = -0.88 day. Epoch = 2016 Sept. 9.0 TT T = 2016 Aug. 29.96850 +/- 0.01180 (m.e.) TT Peri. = 186.94521 +/- 0.00138 Node = 294.37545 +/- 0.00016 (2000.0) Inc. = 15.56480 +/- 0.00008 q = 2.9530170 +/- 0.0000179 AU e = 0.5506402 +/- 0.0000024 a = 6.5716088 +/- 0.0000081 AU n' = 0.05850548 +/- 0.00000011 P = 16.846 +/- 0.0000311 years T = 1999 Oct. 25.07623 TT Epoch = 1999 Oct. 29.0 TT Peri. = 186.69841 e = 0.5504458 Node = 294.31163 (2000.0) a = 6.5493717 AU Inc. = 15.58713 n'= 0.05880370 q = 2.9442973 AU P = 16.761 years The predicted orbit for the 2033 return is as follows: T = 2033 Sept. 8.35461 TT Epoch = 2033 Aug. 31.0 TT Peri. = 188.74967 e = 0.5500387 Node = 292.97140 (2000.0) a = 6.6365900 AU Inc. = 15.70655 n'= 0.05764831 q = 2.9862086 AU P = 17.097 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1999/ 991120 372 1.5- 0.9+ 000118 402 0.8+ 0.6- 991105 703 (1.6- 2.4+) 991121 046 0.4- 0.3+ 000118 402 1.7+ 0.9- 991105 703 (2.6+ 0.5+) 991121 046 0.2+ 0.3+ 000128 360 0.3+ 0.8- 991105 703 0.9- 1.2+ 991121 046 0.4+ 0.3+ 000128 372 (3.6- 0.2-) 991105 703 0.4+ 0.3+ 991121 046 0.5+ 0.0 000128 360 0.2+ 0.3- 991106 649 0.2- 0.2- 991205 704 1.3+ 0.7- 000130 372 (4.7- 1.3+) 991106 649 0.8- 0.2- 991205 704 0.6+ 0.4+ 000206 704 0.2- 1.1+ 991106 649 0.1+ 0.1- 991205 704 0.6- 0.0 000206 704 0.4- 1.0+ 991106 703 1.1- 0.3+ 991207 372 0.2- 0.7+ 000206 704 0.2+ 1.0+ 991106 703 0.0 0.2+ 991207 360 0.4+ 0.3- 000206 704 (1.5- 2.2+) 991106 711 1.1+ 0.1- 991207 360 0.1+ 0.4- 000209 372 1.3- 0.1- 991106 711 (4.6- 0.2-) 991207 360 0.7+ 0.4- 000211 372 1.0- 1.2- 991106 711 (3.7- 1.2-) 991211 372 1.6- 1.7+ 000224 706 0.4- 0.8+ 991107 711 (2.5+ 0.5+) 991213 691 0.7+ 0.7- 000224 706 0.3- 0.5+ 991107 711 (3.2+ 0.9-) 991213 691 1.2+ 0.7- 000229 372 0.5+ 1.1+ 991107 711 (5.4+ 0.8+) 991214 704 (2.5- 2.4+) 000301 703 0.6+ 0.1+ 991107 327 0.2- 0.3- 991214 704 0.7- 1.3+ 000301 703 1.8+ 0.8+ 991107 327 1.4- 0.9- 991214 704 1.7- 0.2+ 000301 703 0.4- 0.5+ 991107 327 0.3- 1.6- 991215 372 1.2- 1.2+ 000301 703 0.1- 1.5+ 991107 327 0.3- 1.3- 991216 699 (3.1- 1.8+) 000302 360 0.8+ 0.3- 991108 372 0.2- 0.1+ 991216 699 0.6- 0.8+ 000302 360 1.2+ 0.4- 991108 327 0.2- 0.4- 991216 699 (2.0- 2.3+) 000302 118 (2.1+ 0.1+) 991108 327 0.5- 0.4- 991220 897 1.3- 0.3- 000304 645 (7.4+ 0.8-) 991108 327 1.0- 0.5- 991220 897 0.7+ 0.1- 000304 118 0.6+ 0.3+ 991109 897 1.8- 0.2- 991220 897 1.3- 0.4+ 000304 118 0.7+ 1.5+ 991109 897 (2.1- 0.1+) 2000/ 000304 118 1.3+ 0.2+ 991109 897 0.2- 0.5- 000101 372 1.1- 0.7- 000325 360 0.6+ 0.4- 991109 897 0.7- 0.5- 000104 402 1.1+ 0.4- 000325 360 1.3+ 0.9- 991109 402 1.1+ 1.0- 000104 402 0.2+ 0.1- 000424 360 0.4- 0.2+ 991109 402 0.2- 0.5- 000104 402 1.0+ 0.4- 000424 360 0.7+ 0.4+ 991109 402 0.1- 0.1- 000104 360 0.2+ 0.3- 2015/ 991109 900 (4.9- 0.6+) 000104 360 0.4+ 0.4- 150913 461 0.2+ 0.3+ 991109 900 (3.5- 0.9+) 000104 360 0.4+ 0.4- 150913 461 0.2+ 0.5+ 991112 695 0.2+ 0.5+ 000105 704 0.3+ 0.7- 151022 461 0.1+ 0.2+ 991112 695 0.3+ 0.5+ 000105 704 1.0- 0.2- 151022 461 0.2- 0.5+ 991112 695 0.4+ 0.5+ 000105 704 0.1+ 0.5- 151022 461 0.1- 0.5+ 991112 372 0.0 0.6- 000105 704 (2.0- 0.1+) 151023 461 0.1+ 0.4+ 991113 402 0.9+ 0.3+ 000108 704 0.6+ 0.1- 151024 461 0.2+ 0.4+ 991113 402 0.7- 0.3- 000108 704 0.6+ 0.1+ 151024 461 0.2- 0.3+ 991113 372 (2.9- 2.3+) 000108 704 0.4- 0.1- 151024 461 0.2- 0.5+ 991116 360 0.2- 0.7- 000108 704 1.5- 0.7- 151024 461 0.0 0.5+ 991116 360 0.3- 0.3- 000108 704 1.6- 0.5+ 991116 360 0.7- 0.2- 000118 402 0.7+ 0.4- ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2015 Oct. 31

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