Nakano Note (Nakano wa Kangaeru noda) NK 2487 P/Spacewatch (2013 EV9)

The following improved orbital elements, by S. Nakano, are from 70 observations 1996 to 2013. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.49 arc second. Epoch = 2013 Apr. 18.0 TT T = 2013 Apr. 7.17302 +/- 0.00054 (m.e.) TT Peri. = 22.10859 +/- 0.00022 Node = 161.22342 +/- 0.00005 (2000.0) Inc. = 14.46689 +/- 0.00002 q = 2.1250934 +/- 0.0000021 AU e = 0.4856581 +/- 0.0000005 a = 4.1316744 +/- 0.0000013 AU n' = 0.11735860 +/- 0.00000006 P = 8.398 +/- 0.0000041 years T = 1996 June 4.19069 TT Epoch = 1996 June 6.0 TT Peri. = 21.13430 e = 0.4872093 Node = 161.45809 (2000.0) a = 4.1179172 AU Inc. = 14.47966 n'= 0.11794721 q = 2.1116297 AU P = 8.356 years T = 2004 Nov. 3.16949 TT Epoch = 2004 Nov. 11.0 TT Peri. = 21.67851 e = 0.4843299 Node = 161.39183 (2000.0) a = 4.1465454 AU Inc. = 14.48391 n'= 0.11672784 q = 2.1382495 AU P = 8.444 years The predicted orbit for the 2021 return is as follows: T = 2021 Sept. 8.01852 TT Epoch = 2021 Sept.23.0 TT Peri. = 22.24982 e = 0.4848201 Node = 161.12915 (2000.0) a = 4.1387425 AU Inc. = 14.45523 n'= 0.11705810 q = 2.1321971 AU P = 8.420 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1996/ 130302 691 0.9- 0.7+ 130429 H06 0.5+ 0.2- 960217 691 0.4+ 0.7- 130302 691 0.2+ 0.6+ 130429 H06 0.5+ 0.4- 960217 691 1.1- 1.3- 130302 691 0.2- 0.8+ 130429 695 0.0 0.2- 960217 691 0.6+ 0.3+ 130305 D29 0.4- 0.3+ 130429 695 0.1- 0.1- 2005/ 130305 D29 0.9- 0.0 130429 695 0.1- 0.2+ 050503 703 1.2- 1.3+ 130305 D29 0.8- 0.1+ 130430 G84 0.4+ 0.1- 050503 703 0.4+ 1.2+ 130323 I41 0.3+ 0.2+ 130430 G84 0.1+ 0.1- 050503 703 0.6- 0.7+ 130323 I41 0.4+ 0.0 130430 G84 0.2+ 0.1- 050503 703 1.7- 1.2+ 130323 I41 0.3+ 0.5+ 130430 695 0.1- 0.1- 050520 644 0.8+ 0.7- 130324 I41 0.1+ 0.2+ 130430 695 0.1- 0.0 050520 644 1.0+ 0.5- 130324 I41 0.2+ 0.2+ 130430 695 0.2+ 0.1- 050520 644 0.3+ 0.7- 130324 I41 0.2+ 0.1+ 130501 H21 0.3+ 0.1- 050616 691 0.5+ 0.3+ 130401 703 (1.7- 3.1-) 130501 H21 0.3+ 0.2- 050616 691 0.5+ 0.5- 130401 703 0.4- 0.9- 130501 H21 0.3+ 0.3- 050616 691 0.1+ 0.3+ 130401 703 0.5+ 0.8- 130501 H01 0.2- 0.0 2013/ 130401 703 0.6- 0.6- 130501 H01 0.1- 0.1+ 130202 691 0.3- 0.4+ 130407 691 0.1- 0.5- 130501 H01 0.1- 0.1+ 130202 691 0.3- 0.8+ 130407 691 0.1- 0.2- 130501 H01 0.1- 0.1+ 130202 691 0.9- 0.7- 130407 691 0.1- 0.7- 130502 D95 0.5+ 0.0 130206 691 0.6+ 0.6+ 130428 Q62 1.0+ 0.5+ 130502 D95 0.9+ 0.8+ 130206 691 0.1+ 0.5+ 130428 Q62 1.2+ 0.1- 130502 D95 0.5+ 0.0 130206 691 0.3- 0.9+ 130428 Q62 0.4+ 0.6- 130503 372 0.0 0.1+ 130214 703 0.7- 1.3+ 130428 D29 0.3- 0.8- 130503 372 0.0 0.1+ 130214 703 (2.1- 1.2+) 130428 D29 0.4+ 0.9- 130503 372 0.2+ 0.3- 130214 703 0.2+ 1.2+ 130428 D29 (0.5+ 2.8-) 130214 703 0.2- 0.7+ 130429 H06 0.6+ 0.2- ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2013 May 5

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