Nakano Note (Nakano wa Kangaeru noda) NK 2694 P/Lemmon-PANSTARRS (2007 RJ236 = 2014 K2)

The following improved orbital elements, by S. Nakano, are from 29 observations 2007 to 2014. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.38 arc second. Epoch = 2016 May 12.0 TT T = 2016 Apr. 30.48383 +/- 0.02949 (m.e.) TT Peri. = 208.26675 +/- 0.00393 Node = 121.78153 +/- 0.00070 (2000.0) Inc. = 6.03090 +/- 0.00002 q = 3.3026383 +/- 0.0000833 AU e = 0.2283927 +/- 0.0000180 a = 4.2802061 +/- 0.0000344 AU n' = 0.11130305 +/- 0.00000134 P = 8.855 +/- 0.0001067 years (+/- 0.04 day) T = 2007 July 4.61030 TT Epoch = 2007 June 29.0 TT Peri. = 208.20022 e = 0.2304486 Node = 121.82909 (2000.0) a = 4.2591529 AU Inc. = 6.03789 n'= 0.11212933 q = 3.2776369 AU P = 8.790 years The predicted orbit for the 2025 return is as follows: T = 2025 Mar. 9.42443 TT Epoch = 2025 Mar. 26.0 TT Peri. = 208.61662 e = 0.2293182 Node = 121.71247 (2000.0) a = 4.2676680 AU Inc. = 6.03568 n'= 0.11179391 q = 3.2890141 AU P = 8.816 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2007/ 070915 699 0.1+ 0.2+ 140429 F51 0.0 0.2+ 070816 D29 0.1- 0.3- 070915 699 0.1- 0.4+ 140429 F51 0.2+ 0.1- 070816 D29 0.1- 0.1- 070918 699 (2.1+ 1.2+) 140429 F51 0.1- 0.1- 070816 D29 0.0 0.2- 070918 699 0.8- 0.8+ 140429 F51 0.0 0.1- 070816 D29 0.1- 0.1+ 070918 699 0.3- 0.0 140521 F51 0.0 0.0 070913 G96 0.1- 0.5- 070918 699 0.6- 0.4- 140521 F51 0.0 0.1- 070913 G96 0.3- 0.2- 071002 E12 (2.7+ 0.2+) 140521 F51 0.1+ 0.0 070913 G96 0.0 0.1- 071002 E12 1.4+ 0.4+ 140521 F51 0.2+ 0.1- 070913 G96 0.1- 0.2- 071002 E12 1.3+ 1.2+ 140522 568 0.1- 0.1+ 070915 699 1.5- 0.0 071002 E12 1.6+ 0.3- 140522 568 0.1- 0.1+ 070915 699 0.2- 0.5- 2014/ 140522 568 0.1- 0.1+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2014 May 23

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