Nakano Note (Nakano wa Kangaeru noda) NK 2899 P/2013 EW90 (Tenagra)
The following improved orbital elements, by S. Nakano, are from 59 observations 2013 Feb. 16 to 2014 May 17. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.42 arc second. Orbit depends upon only one night observations in 2014. See the previous orbit in HICQ 2014. Epoch = 2012 Sept.30.0 TT T = 2012 Oct. 11.66809 +/- 0.00878 (m.e.) TT Peri. = 346.00031 +/- 0.00173 Node = 160.36252 +/- 0.00006 (2000.0) Inc. = 31.81312 +/- 0.00008 q = 3.3002953 +/- 0.0000187 AU e = 0.1960611 +/- 0.0000060 a = 4.1051568 +/- 0.0000093 AU n' = 0.11849757 +/- 0.00000040 P = 8.318 +/- 0.0000283 years The predicted orbit for the 2021 return is as follows: T = 2021 Feb. 15.57597 TT Epoch = 2021 Mar. 7.0 TT Peri. = 346.31431 e = 0.1948809 Node = 160.29407 (2000.0) a = 4.1162573 AU Inc. = 31.79009 n'= 0.11801856 q = 3.3140774 AU P = 8.351 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2013/ 130410 G96 0.3+ 0.2- 130503 F65 0.2- 0.2- 130216 691 0.0 0.6+ 130411 D29 0.2+ 0.1- 130503 F65 0.2+ 0.1- 130216 691 0.1- 0.1- 130411 D29 1.2+ 0.4- 130504 204 0.3+ 0.2+ 130216 691 0.0 0.4+ 130411 D29 0.0 0.7- 130504 204 0.6+ 0.0 130303 926 0.5+ 0.1+ 130411 D29 0.1- 0.0 130506 204 0.5- 0.0 130303 926 0.6+ 0.1- 130411 D29 0.3+ 0.1- 130506 204 0.4+ 0.5+ 130303 691 0.1- 0.0 130411 D29 0.3- 0.5- 130506 204 0.2- 0.6- 130303 926 0.5+ 0.1- 130413 I41 0.1- 0.2- 130507 711 0.1- 0.3- 130303 691 0.3+ 0.1+ 130413 I41 0.0 0.0 130507 711 0.0 0.5- 130303 691 0.1- 0.7- 130413 I41 0.2+ 0.2- 130507 711 0.0 0.4- 130314 703 0.7- 0.5+ 130414 I41 0.0 0.0 130507 711 0.1- 0.6- 130314 703 0.5+ 0.7- 130414 I41 0.1- 0.1+ 130507 711 0.2- 0.4- 130314 703 0.5+ 0.3+ 130414 I41 0.2+ 0.3+ 130513 372 0.5+ 0.4+ 130314 703 0.6- 0.5- 130418 I41 0.1+ 0.0 130513 372 0.0 0.4+ 130314 703 1.0- 0.2- 130418 I41 0.1- 0.0 130513 372 0.2+ 0.3- 130404 703 0.5- 1.4+ 130418 I41 0.2+ 0.2- 130514 215 (4.1- 1.9+) 130404 703 (2.1- 0.7-) 130430 H06 0.0 0.3+ 130514 215 (3.0- 1.1+) 130404 703 0.8- 0.8+ 130430 H06 0.4- 0.1- 130514 215 (2.8- 0.4+) 130404 703 0.8- 0.5+ 130502 H06 0.1+ 0.6+ 2014/ 130410 G96 0.0 0.1+ 130502 H06 0.2+ 0.7+ 140517 C10 0.6- 0.4- 130410 G96 0.2- 0.3- 130502 H06 0.2- 1.2+ 140517 C10 0.6+ 0.5+ 130410 G96 0.1- 0.1- 130503 F65 0.2- 0.5- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2015 May 14