Nakano Note (Nakano wa Kangaeru noda) NK 2274 259P/Garradd (2008 R1)
The following improved orbital elements, by S. Nakano, are from 38 observations 2008 July 15 to 2012 Apr. 15. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.73 arc second. The recent 2012 observations show about 46" off from an orbit in NK 2095 (= HICQ 2011/2012 = HICQ 2012) with delta-T vaule = -0.035 day. See the previous orbits in NK 1914 and NK 2095. Epoch = 2013 Jan. 28.0 TT T = 2013 Jan. 25.43377 +/- 0.00156 (m.e.) TT Peri. = 256.55896 +/- 0.00026 Node = 51.96115 +/- 0.00022 (2000.0) Inc. = 15.89883 +/- 0.00004 q = 1.7976843 +/- 0.0000053 AU e = 0.3409705 +/- 0.0000016 a = 2.7277753 +/- 0.0000038 AU n' = 0.21877172 +/- 0.00000045 P = 4.505 +/- 0.0000094 years T = 2008 July 25.30512 TT Epoch = 2008 Aug. 2.0 TT Peri. = 256.50766 e = 0.3423363 Node = 51.99568 (2000.0) a = 2.7264031 AU Inc. = 15.90292 n'= 0.21893690 q = 1.7930564 AU P = 4.502 years The predicted orbit for the 2017 return is as follows: T = 2017 Aug. 4.02528 TT Epoch = 2017 July 26.0 TT Peri. = 257.50335 e = 0.3377133 Node = 51.48459 (2000.0) a = 2.7313769 AU Inc. = 15.88948 n'= 0.21833915 q = 1.8089546 AU P = 4.514 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2008/ 080902 E16 (0.8+ 2.6-) 080927 423 0.3+ 0.8+ 080715 E12 1.9- 0.8- 080902 E16 (0.9+ 3.1-) 080930 423 0.1+ 1.8+ 080902 E12 0.7- 1.5+ 080904 I77 0.0 0.9+ 081001 423 1.1+ 0.5+ 080902 E12 (0.1- 2.3+) 080904 I77 1.6- 0.9+ 2010/ 080902 E12 0.1- 0.3+ 080909 E12 0.3- 0.6- 100413 568 0.3+ 1.2- 080902 E12 0.1- 1.4+ 080923 F84 0.4- 1.3+ 2011/ 080902 E12 0.0 0.5- 080923 F84 0.2+ 0.6+ 110203 568 0.8+ 1.4+ 080902 E12 0.4- 0.5- 080923 E12 0.4+ 0.2+ 110203 568 0.7+ 1.4+ 080902 E12 0.2- 0.4- 080923 E12 0.6+ 0.3+ 110205 568 0.9+ 1.7+ 080902 E12 0.0 0.3- 080923 E12 0.8+ 0.1- 110205 568 0.5+ 1.7+ 080902 E12 0.2- 0.6- 080924 F84 0.3+ 0.4+ 2012/ 080902 E12 0.2- 0.5- 080924 E12 0.5+ 0.1+ 120414 I33 0.0 0.0 080902 E16 (0.8+ 3.3-) 080924 415 0.1+ 0.6- 120414 I33 0.0 0.0 080902 E16 (1.6+ 3.4-) 080924 415 0.1- 0.2- 120415 568 0.1+ 0.2+ 080902 E16 (1.4+ 4.0-) 080925 E12 0.5+ 0.3- 120415 568 0.0 0.2+ 080902 E16 (1.0+ 2.8-) 080925 E12 0.2+ 0.2- 120415 568 0.2+ 0.2+ 080902 E16 (1.7+ 3.3-) 080927 423 1.0+ 0.3- ( ) -------- Rejected Obs.
Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 June 8