Nakano Note (Nakano wa Kangaeru noda) NK 2219 P/2011 VJ5 (Lemmon)

The following improved orbital elements, by S. Nakano, are from 50 observations 2011 Nov. 3 to 2012 Feb. 28. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.56 arc second. The 2012 March observations show a large residual = 34" from an orbit in NK 2208. The comet will pass 0.45 AU from Jupiter in 2020 June. Epoch = 2011 Dec. 25.0 TT T = 2011 Dec. 8.70493 +/- 0.00043 (m.e.) TT Peri. = 315.12791 +/- 0.00034 Node = 169.99765 +/- 0.00042 (2000.0) Inc. = 3.97279 +/- 0.00006 q = 1.5064032 +/- 0.0000148 AU e = 0.5572513 +/- 0.0000511 a = 3.4023890 +/- 0.0001158 AU n' = 0.15704645 +/- 0.00000802 P = 6.276 +/- 0.0003205 years (+/- 0.12 day) The predicted orbit for the 2018 return is as follows: T = 2018 Mar. 22.71180 TT Epoch = 2018 Mar. 23.0 TT Peri. = 315.28323 e = 0.5570355 Node = 169.91693 (2000.0) a = 3.4040433 AU Inc. = 3.97544 n'= 0.15693198 q = 1.5078704 AU P = 6.280 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2011/ 120201 G96 0.9+ 0.0 120203 H06 1.8- 1.1+ 111103 G96 0.3+ 0.1+ 120201 G96 0.6+ 0.3- 120203 H06 1.7- 1.0+ 111103 G96 0.6+ 0.1+ 120201 G96 0.8+ 0.3- 120204 215 0.3- 0.5+ 111103 G96 0.1- 0.2+ 120201 G96 0.5+ 0.0 120204 215 0.0 0.3+ 111103 G96 0.2- 0.1- 120201 F65 1.3+ 0.3- 120204 215 0.4+ 0.1- 111104 H36 (2.2+ 0.4-) 120201 F65 1.3+ 0.3- 120219 691 (3.3- 0.9+) 111104 H36 1.1- 0.1+ 120201 F65 1.4+ 0.2- 120219 691 (4.1- 2.0+) 111104 H36 0.1- 1.2+ 120202 807 1.0+ 0.2- 120219 691 (4.5- 1.2+) 111105 B18 0.2- 0.8- 120202 807 0.7+ 0.4- 120219 349 (2.8- 1.0+) 111105 B18 0.6+ 0.0 120202 807 0.7+ 0.2- 120219 349 (3.3- 0.5+) 111105 B18 0.0 0.3- 120202 807 0.8+ 0.3- 120222 H06 0.3+ 0.2- 111105 B18 0.2+ 0.5- 120202 807 1.0+ 0.4- 120222 H06 0.2- 0.1- 2012/ 120202 G96 0.1- 0.0 120227 A71 0.7- 0.0 120201 703 1.9- 0.3+ 120202 G96 0.2- 0.6+ 120227 A71 0.1- 0.3- 120201 703 0.1+ 0.4- 120202 G96 0.3- 0.3+ 120228 F51 0.0 0.0 120201 703 0.7- 0.3+ 120202 G96 1.1- 0.4+ 120228 F51 0.0 0.0 120201 703 1.9- 0.5- 120202 703 0.9+ 0.9- 120228 F51 0.1+ 0.1+ 120201 703 (2.2- 0.6-) 120202 703 0.2+ 1.1- 120321 703 (4.9- 0.9+) 120201 703 0.4- 0.5- 120202 703 1.8- 0.5- 120321 703 (4.7- 0.3-) 120201 703 0.7- 0.5+ 120203 H06 0.3+ 0.6+ 120321 703 (3.9- 0.2-) 120201 703 0.5+ 0.1- 120203 H06 1.0- 1.0+ 120321 703 (3.3- 1.0-) ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 Mar. 27

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