Nakano Note (Nakano wa Kangaeru noda) NK 2310 P/2008 S1 (Catalina-McNaught)

The following improved orbital elements, by S. Nakano, are from 75 observations 2008 May 2 to 2009 Jan. 4. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.66 arc second. See the previous orbits on HICQ 2008/2009 (= YC 2597). There is an identification P/2008 S1 = 1998 JK (2008 May observations) found by the MPC. Epoch = 2008 Oct. 21.0 TT T = 2008 Oct. 1.82934 +/- 0.00017 (m.e.) TT Peri. = 203.63081 +/- 0.00021 Node = 111.39029 +/- 0.00011 (2000.0) Inc. = 15.10167 +/- 0.00005 q = 1.1902382 +/- 0.0000014 AU e = 0.6664085 +/- 0.0000070 a = 3.5679506 +/- 0.0000212 AU n' = 0.14624325 +/- 0.00000130 P = 6.740 +/- 0.0000599 years The predicted orbit for the 2015 return is as follows: T = 2015 July 1.86756 TT Epoch = 2015 June 27.0 TT Peri. = 203.66465 e = 0.6652865 Node = 111.36390 (2000.0) a = 3.5753915 AU Inc. = 15.07383 n'= 0.14578696 q = 1.1967319 AU P = 6.761 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2008/ 080918 D90 1.7- 0.7- 080925 467 1.8- 0.1+ 080502 703 0.2- 0.5- 080919 E12 0.1- 0.2+ 080926 E85 (0.9+ 4.0+) 080502 703 1.1+ 1.4+ 080919 E12 0.0 0.0 080926 E85 (3.6+ 1.0-) 080502 703 0.2- 1.5+ 080919 423 1.0+ 0.4- 081020 467 0.6+ 0.2- 080502 703 0.6+ 0.1+ 080919 423 0.6- 0.0 081020 467 0.0 0.5- 080502 703 0.6- 0.2- 080920 423 0.2+ 0.6- 081020 467 0.1- 0.1+ 080502 703 0.3- 0.1+ 080920 E12 0.1- 0.1+ 081120 E85 (0.9+ 4.3+) 080502 703 0.0 0.6+ 080920 E12 0.0 0.1- 081120 E85 0.0 0.6- 080502 703 0.1- 0.1+ 080920 423 0.5+ 0.1+ 081120 E85 1.3+ 0.5+ 080502 J95 0.4+ 0.2+ 080921 F84 0.6+ 0.7+ 081121 E85 (2.6+ 0.2+) 080502 J95 0.3+ 0.0 080921 F84 0.3+ 0.1+ 081121 E85 0.7+ 1.7+ 080502 J95 1.1+ 0.7- 080921 F84 0.8- 0.2+ 081121 E85 1.7+ 0.1- 080917 E12 0.2- 0.9+ 080921 E12 0.0 0.0 081123 J24 1.6- 0.6+ 080917 E12 0.0 0.6+ 080921 423 0.5+ 0.1+ 081123 J24 0.2+ 0.5+ 080917 E12 0.6+ 0.3- 080921 423 0.4+ 0.3- 081127 E85 1.4- 1.3+ 080917 E12 0.2- 0.4+ 080922 E85 0.1+ 0.6- 081127 E85 0.2- 1.7- 080918 H55 0.2+ 0.6+ 080922 E85 1.3- 0.3+ 081127 E85 0.2+ 1.7+ 080918 H55 0.1+ 0.5+ 080922 E85 0.3- 0.1- 081219 204 0.3- 1.4+ 080918 H55 0.4+ 0.6+ 080922 467 0.1+ 0.5- 081224 204 0.1+ 0.1+ 080918 673 0.2+ 0.5- 080922 467 0.3- 0.7- 081224 204 0.1+ 0.3- 080918 673 0.3- 0.0 080922 467 0.3- 0.3- 081226 474 0.5+ 1.9+ 080918 673 0.5+ 0.4- 080924 F84 0.4+ 0.4- 081226 474 (2.2- 0.8+) 080918 673 0.2+ 0.1- 080924 423 0.1- 0.4+ 2009/ 080918 E12 0.0 0.0 080925 E85 1.0+ 0.8- 090102 204 0.9- 0.3+ 080918 E12 0.0 0.0 080925 E85 0.0 0.2- 090102 204 0.3- 0.1+ 080918 D90 0.6- 0.5- 080925 E85 0.8- 0.2+ 090104 474 0.6- 1.4- 080918 D90 0.5- 0.3+ 080925 467 1.5- 0.7+ 090104 474 0.1- 0.0 080918 E12 0.0 0.4- 080925 467 (0.7- 2.4+) ( ) -------- Rejected Obs.

Associate of Central Bureau for Astronomical Telegrams Syuichi Nakano 2012 July 30

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