Nakano Note (Nakano wa Kangaeru noda) NK 3289 P/Lemmon (2010 EY90 = 2017 B1)
The following improved orbital elements, by S. Nakano, are from 42 observations 2010 to 2017. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.49 arc second. Residuals of first night observations of P/2017 B1 were +0.87 deg for Right Ascension and -0.46 deg for Declinations from an orbit in MPO 176524 with the delta-T correction = -3.83 days. Epoch = 2017 Sept. 4.0 TT T = 2017 Aug. 26.73578 +/- 0.00339 (m.e.) TT Peri. = 255.97760 +/- 0.00166 Node = 331.78218 +/- 0.00052 (2000.0) Inc. = 5.49227 +/- 0.00015 q = 2.4985838 +/- 0.0000335 AU e = 0.3005875 +/- 0.0000096 a = 3.5724034 +/- 0.0000192 AU n' = 0.14596991 +/- 0.00000117 P = 6.752 +/- 0.0000543 years T = 2010 Dec. 3.62642 TT Epoch = 2010 Nov. 20.0 TT Peri. = 256.49345 e = 0.3010626 Node = 331.82652 (2000.0) a = 3.5710989 AU Inc. = 5.49784 n'= 0.14604990 q = 2.4959747 AU P = 6.748 years The predicted orbit for the 2024 return is as follows: T = 2024 May 27.12303 TT Epoch = 2024 May 10.0 TT Peri. = 255.79072 e = 0.2985359 Node = 331.74944 (2000.0) a = 3.5784753 AU Inc. = 5.48809 n'= 0.14559855 q = 2.5101718 AU P = 6.769 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2010/ 100407 G96 0.4- 0.2+ 100519 C51 0.5- 0.3+ 100314 G96 0.1- 0.1+ 100407 G96 0.3- 0.3+ 100519 C51 0.2+ 0.6+ 100314 G96 0.2+ 0.3- 100517 G96 1.2- 0.2- 2017/ 100314 G96 0.1- 0.2+ 100517 G96 0.5- 0.5- 170107 G96 0.2+ 0.2- 100314 G96 0.2+ 0.2- 100517 G96 1.0- 0.1- 170107 G96 0.2+ 0.5+ 100315 G96 0.1- 0.1+ 100517 G96 0.5- 0.3- 170107 G96 1.0- 0.5+ 100315 G96 0.1+ 0.0 100518 C51 0.5+ 1.4- 170107 G96 0.5- 0.2+ 100315 G96 0.2+ 0.4- 100518 C51 (0.9+ 2.1+) 170126 F51 0.1+ 0.1- 100315 G96 0.0 0.2+ 100518 C51 1.3+ 0.9- 170126 F51 0.0 0.1- 100407 G96 0.6+ 0.0 100518 C51 0.9+ 0.8+ 170126 F51 0.0 0.1- 100407 G96 0.0 0.5- 100518 C51 0.3+ 0.4+ 170127 474 0.3- 0.2- 100407 G96 0.1+ 0.6+ 100518 C51 0.2+ 0.2- 170127 474 0.3- 0.2+ 100407 G96 0.1+ 0.2+ 100518 C51 0.7+ 0.9- 170127 474 0.2- 0.1+ 100407 G96 0.4- 0.1+ 100519 C51 0.9- 0.2+ 170127 474 1.4- 0.5- 100407 G96 0.1+ 0.4+ 100519 C51 1.0+ 1.7+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2017 Feb. 3