Nakano Note (Nakano wa Kangaeru noda) NK 3831 P/LINEAR-Spacewatch (2000 S4 = 2019 K2)

The following improved orbital elements, by S. Nakano, are from 43 observations 2000 to 2019. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.51 arc second. Residuals of the recovery observations were -1.32 deg for Right Ascension and +0.15 deg for Declination from the prediction in NK 815 (= HICQ 2019) with the delta-T correction = +3.8 days. Epoch = 2019 Oct. 4.0 TT T = 2019 Sept.26.87863 +/- 0.00252 (m.e.) TT Peri. = 173.09267 +/- 0.00090 Node = 173.79232 +/- 0.00006 (2000.0) Inc. = 28.37702 +/- 0.00008 q = 2.2653793 +/- 0.0000060 AU e = 0.6814529 +/- 0.0000009 a = 7.1115989 +/- 0.0000268 AU n' = 0.05197006 +/- 0.00000029 P = 18.965 +/- 0.0001073 years (+/- 0.04 day) T = 2000 Oct. 19.08814 TT Epoch = 2000 Oct. 23.0 TT Peri. = 172.32042 e = 0.6819591 Node = 174.64378 (2000.0) a = 7.1232642 AU Inc. = 28.32766 n'= 0.05184245 q = 2.2654894 AU P = 19.012 years The predicted orbit for the 2038 return is as follows: T = 2038 Oct. 9.54798 TT Epoch = 2038 Oct. 24.0 TT Peri. = 173.29052 e = 0.6811949 Node = 173.79338 (2000.0) a = 7.1194683 AU Inc. = 28.37010 n'= 0.05188391 q = 2.2697230 AU P = 18.996 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2000/ 001003 691 1.1- 0.9- 001029 691 1.4+ 1.5- 000901 704 0.3- 0.7+ 001003 691 0.3+ 0.2- 001029 691 1.3+ 1.8+ 000901 704 0.2+ 0.8- 001003 691 0.4- 0.5- 001029 691 (2.9+ 0.1-) 000901 704 0.8+ 0.2+ 001003 691 0.2- 0.2+ 001121 691 0.8+ 1.1- 000901 704 0.7+ 0.2+ 001003 691 0.3- 1.0- 001121 691 (3.4+ 2.8+) 000901 704 0.1- 0.4- 001003 691 0.3+ 0.0 001121 691 0.5- 1.4+ 000923 704 0.6+ 0.1+ 001004 691 0.1+ 0.0 001121 691 0.9- 1.0+ 000923 704 0.2+ 1.8+ 001004 691 0.1+ 0.0 001121 691 (2.6+ 2.3+) 000923 704 0.5+ 0.3- 001004 691 0.4+ 0.4- 2019/ 000923 704 0.5- 1.1+ 001004 691 0.1+ 0.4- 190529 F51 0.1+ 0.0 000926 704 0.1- 0.3- 001004 691 0.1+ 0.1+ 190529 F51 0.1+ 0.0 000926 704 0.8- 1.1+ 001007 691 0.2- 1.0- 190529 F51 0.1- 0.0 000926 704 (1.6+ 2.4+) 001007 691 0.0 0.7- 190529 F51 0.1- 0.1- 000926 704 0.2- 1.6+ 001007 691 0.2+ 0.5- 190601 G96 0.7- 0.7+ 001002 691 0.4- 0.1- 001021 691 (2.6- 0.5-) 190601 G96 0.2+ 0.3+ 001002 691 0.3- 0.9- 001021 691 0.8- 0.0 190601 G96 0.3- 0.1- 001002 691 0.3- 0.4- 001021 691 0.6- 0.3+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2019 June 9

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