Nakano Note (Nakano wa Kangaeru noda) NK 3891 P/Gibbs (2007 T4 = 2019 R2)
The following improved orbital elements, by S. Nakano, are from 71 observations 2007 to 2019. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.69 arc second. Rediduals for recovery observations were +16" for Right Ascension and -2" for Declination from the prediction in NK 1629 (= HICQ 2018/2019) with the delta-T correction = -0.015 day. See the previous orbits in NK 1569, NK 1629 and CBET 4662 (this orbit). Epoch = 2019 July 16.0 TT T = 2019 July 23.63555 +/- 0.00078 (m.e.) TT Peri. = 42.42372 +/- 0.00059 Node = 37.05890 +/- 0.00022 (2000.0) Inc. = 23.85877 +/- 0.00003 q = 2.0050202 +/- 0.0000151 AU e = 0.6180854 +/- 0.0000029 a = 5.2499172 +/- 0.0000557 AU n' = 0.08193612 +/- 0.00000130 P = 12.029 +/- 0.0001915 years (+/- 0.07 day) T = 2007 July 20.72527 TT Epoch = 2007 Aug. 8.0 TT Peri. = 42.51823 e = 0.6174233 Node = 37.22920 (2000.0) a = 5.2507979 AU Inc. = 23.87178 n'= 0.08191551 q = 2.0088331 AU P = 12.032 years The predicted orbit for the 2031 return is as follows: T = 2031 July 28.83942 TT Epoch = 2031 Aug. 2.0 TT Peri. = 42.32795 e = 0.6181856 Node = 36.91351 (2000.0) a = 5.2533582 AU Inc. = 23.84282 n'= 0.08185563 q = 2.0058077 AU P = 12.041 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2007/ 071014 G96 0.4- 0.4+ 071113 703 1.2- 0.2+ 071012 703 0.3+ 0.6- 071014 G96 0.1+ 0.1- 071117 213 0.9- 1.3+ 071012 703 0.2- 0.0 071014 G96 0.6- 0.9+ 071117 213 0.6- 0.5+ 071012 703 0.2+ 0.0 071014 673 1.6+ 1.1- 071117 213 1.0- 0.5+ 071012 703 1.0- 0.4+ 071014 673 0.5+ 1.2- 071231 349 0.5+ 0.7- 071012 703 0.3+ 1.2- 071015 G96 0.4- 0.4+ 071231 349 0.8+ 0.4- 071012 703 0.3- 0.7+ 071015 G96 0.2+ 0.1- 2008/ 071012 703 0.0 0.5- 071015 G96 0.2+ 0.2- 080101 349 0.3- 0.8- 071012 703 1.1+ 0.1+ 071015 G96 1.0- 0.5+ 080101 349 0.0 0.6- 071012 703 0.6- 0.2+ 071015 673 0.2- 0.4- 080208 215 0.6+ 0.2- 071012 703 0.3+ 0.5+ 071015 673 1.1+ 0.8- 080212 204 0.5- 0.7- 071012 703 1.5- 0.9+ 071015 673 0.7+ 1.0- 080212 204 0.2- 0.1- 071012 703 1.5- 0.3+ 071015 673 0.6+ 0.6- 080404 204 0.3- 0.3+ 071013 703 0.8+ 0.9+ 071016 204 0.6+ 0.4- 080404 204 0.8- 0.1- 071013 703 0.8+ 0.7+ 071022 204 0.0 0.5+ 080425 G96 0.9+ 0.8+ 071013 703 0.4+ 0.7+ 071023 734 0.6+ 0.1- 080425 G96 0.1- 0.5+ 071013 703 0.9+ 0.3+ 071023 734 1.0+ 0.8- 2019/ 071013 703 0.9- 1.1+ 071023 734 0.2+ 0.8- 190905 H06 0.3- 0.4- 071013 703 0.4- 1.2+ 071103 850 1.2+ 0.8- 190905 H06 0.6- 0.3- 071013 703 1.9- 0.6+ 071103 850 1.4- 0.2+ 190905 H06 0.2- 0.0 071013 703 0.5- 0.3+ 071107 734 0.0 0.4- 190906 N55 0.1+ 0.2- 071014 B15 0.5+ 0.4- 071107 734 0.8+ 0.7- 190906 N55 1.2- 0.4+ 071014 B15 0.5+ 0.1+ 071107 734 0.2- 0.6+ 190907 N55 1.0+ 0.2- 071014 B15 0.2+ 0.2- 071113 703 1.3+ 0.7+ 190907 N55 1.1+ 0.8- 071014 G96 0.3- 0.3+ 071113 703 0.7- 0.3+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2019 Sept. 10