Nakano Note (Nakano wa Kangaeru noda) NK 3172 P/Gibbs (2009 K1 = 2016 M2)

The following improved orbital elements, by S. Nakano, are from 128 observations 2009 to 2016. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.65 arc second. The residuals of recovery observations were +299" for Right Ascension and -63" for Declination from the prediction in NK 1985 (= HICQ 2016) with the delta-T correction = -0.19 day. Epoch = 2016 July 31.0 TT T = 2016 July 24.18472 +/- 0.00035 (m.e.) TT Peri. = 27.43244 +/- 0.00032 Node = 172.77103 +/- 0.00020 (2000.0) Inc. = 5.74394 +/- 0.00003 q = 1.3397469 +/- 0.0000007 AU e = 0.6370958 +/- 0.0000002 a = 3.6917371 +/- 0.0000007 AU n' = 0.13894980 +/- 0.00000004 P = 7.093 +/- 0.0000021 years T = 2009 June 25.91652 TT Epoch = 2009 June 18.0 TT Peri. = 27.06428 e = 0.6396988 Node = 172.79237 (2000.0) a = 3.6717676 AU Inc. = 5.74661 n'= 0.14008489 q = 1.3229423 AU P = 7.036 years The predicted orbit for the 2023 return is as follows: T = 2023 Aug. 30.94350 TT Epoch = 2023 Sept.13.0 TT Peri. = 27.45928 e = 0.6356854 Node = 172.72307 (2000.0) a = 3.7008695 AU Inc. = 5.73323 n'= 0.13843580 q = 1.3482809 AU P = 7.120 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2009/ 090519 673 1.1- 0.7+ 090731 A77 (2.3+ 1.2-) 090424 G96 0.4+ 0.1+ 090519 673 0.3- 0.6+ 090801 D25 0.9- 1.2+ 090424 G96 0.6+ 0.2- 090519 673 0.2- 0.5+ 090801 D25 1.5+ 1.4+ 090424 G96 1.3+ 0.1+ 090519 585 1.2- 0.9+ 090802 D90 1.3- 0.4+ 090424 G96 1.1+ 0.0 090519 585 0.1- 0.1+ 090802 D90 1.3- 0.5+ 090516 G96 1.1+ 1.2- 090519 585 0.1- 0.4- 090802 D90 1.3- 0.8+ 090516 G96 0.4- 0.6- 090519 585 0.2- 0.9+ 090803 D90 1.2- 0.6+ 090516 G96 0.0 0.3- 090519 585 0.6- 0.2+ 090803 D90 1.5- 0.5+ 090516 G96 0.2- 0.2- 090519 204 0.4- 0.9+ 090803 D25 0.6+ 0.5+ 090516 G96 0.3- 0.1- 090520 J47 0.4+ 0.1- 090803 D25 1.7+ 0.2+ 090516 G96 0.1+ 0.1- 090520 J47 0.4+ 0.1- 090803 D25 1.1+ 0.1- 090516 G96 0.0 0.5+ 090520 J47 0.7+ 0.0 090806 D90 0.8- 0.7+ 090516 G96 0.7- 0.3- 090523 204 0.1+ 0.8+ 090806 D90 0.6+ 0.0 090517 G96 0.0 0.3+ 090524 215 0.9+ 0.6- 090814 D90 0.9+ 0.2+ 090517 G96 0.1- 0.0 090524 J47 0.5+ 0.1+ 090814 D90 0.0 0.2+ 090517 G96 0.8- 0.2+ 090524 J47 0.3+ 0.5- 090814 D90 0.3- 0.2- 090517 G96 0.3- 0.1+ 090524 J47 0.2+ 1.6- 090815 349 1.3+ 0.7- 090517 G96 0.0 0.0 090526 703 0.2+ 1.0- 090815 349 0.9+ 0.4- 090517 G96 0.6- 0.0 090526 703 0.3- 0.8+ 090815 349 0.7+ 0.3- 090517 G96 0.7- 0.0 090527 A77 0.9- 1.1+ 090818 D90 0.5+ 0.3+ 090517 G96 0.1+ 0.1+ 090601 J47 1.5+ 0.6+ 090818 D90 0.4+ 0.3+ 090517 B03 1.8+ 0.6- 090601 J47 0.6+ 0.4- 090818 D90 0.2+ 0.4+ 090517 595 0.3- 0.2- 090601 J47 0.7+ 1.3- 090825 D25 0.6+ 0.4- 090517 B03 0.9- 0.5- 090612 204 0.6- 0.5- 090825 D25 0.7+ 0.4- 090517 B03 0.8+ 0.6+ 090612 204 0.8- 0.2- 090827 D25 0.5+ 0.5+ 090517 595 0.4+ 0.8+ 090624 703 0.5- 0.9- 090829 D25 0.4+ 0.8- 090517 B03 0.3- 0.5- 090624 703 1.8+ 1.8- 090829 D25 0.8- 0.4- 090518 H55 0.5- 0.2- 090624 703 1.3+ 1.1- 090905 D90 (2.6- 0.3-) 090518 H55 0.1- 0.2- 090624 703 1.5+ 1.4- 090905 D90 (2.5- 0.1+) 090518 H55 0.4- 0.0 090708 H06 1.1- 0.9- 090907 D90 1.4- 0.2- 090518 G96 0.0 0.0 090724 H10 1.7- 0.2+ 090907 D90 1.4- 0.0 090518 G96 0.7- 0.2+ 090724 H10 0.7- 0.2- 090907 D90 1.4- 0.4+ 090518 G96 0.3- 0.3+ 090724 H10 1.3- 0.2- 090911 E12 0.0 0.6- 090518 G96 0.0 0.5+ 090728 A77 0.4+ 0.2- 090914 D25 0.5+ 0.6+ 090518 G96 0.3- 0.0 090728 A77 0.7+ 0.3- 090914 D25 0.9+ 0.1+ 090518 G96 0.4- 0.1- 090728 A77 (2.0- 1.2-) 090918 D25 0.1- 0.7- 090518 G96 0.1- 0.3+ 090730 H10 0.4- 0.2- 2016/ 090518 G96 0.2- 0.1+ 090730 H10 0.6- 0.1+ 160629 Q62 0.1- 0.5+ 090518 G96 0.2- 0.0 090730 D25 0.7+ 0.1+ 160629 Q62 0.0 0.3+ 090518 G96 0.3+ 0.2- 090730 D25 0.3+ 0.1+ 160629 Q62 0.1+ 0.1+ 090518 G96 0.4- 0.0 090730 D25 0.4+ 0.6+ 160703 Q62 0.3+ 0.4+ 090518 G96 0.0 0.3- 090731 D25 0.6+ 0.2- 160703 Q62 0.1- 0.1+ 090518 213 0.2- 0.2+ 090731 D25 0.4+ 0.3- 160703 Q62 0.1- 0.0 090518 213 0.4- 0.3+ 090731 D25 0.4+ 0.2- 160703 Q62 0.2+ 0.2- 090518 213 0.6- 0.5+ 090731 A77 (7.1+ 1.3-) 090519 673 0.3- 0.3+ 090731 A77 (4.5- 1.2-) ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2016 July 5

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