Nakano Note (Nakano wa Kangaeru noda) NK 4574 P/2021 R8 (Sheppard)
The following improved orbital elements, by S. Nakano, are from 25 observations 2021 Aug. 12 to Dec. 7. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.34 arc second. See an orbit in CBET 5079 (same orbit). Epoch = 2021 Sept.23.0 TT T = 2021 Oct. 7.47352 +/- 0.01501 (m.e.) TT Peri. = 190.77845 +/- 0.00541 Node = 167.02544 +/- 0.00019 (2000.0) Inc. = 2.20308 +/- 0.00006 q = 2.1310487 +/- 0.0000144 AU e = 0.2940196 +/- 0.0000052 a = 3.0185662 +/- 0.0000302 AU n' = 0.18793299 +/- 0.00000282 P = 5.244 +/- 0.0000787 years The predicted orbit for the 2027 return is as follows: T = 2027 Jan. 5.74939 TT Epoch = 2026 Dec. 26.0 TT Peri. = 190.82303 e = 0.2922775 Node = 167.00221 (2000.0) a = 3.0205273 AU Inc. = 2.20284 n'= 0.18774999 q = 2.1376952 AU P = 5.250 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2021/ 210904 F51 0.2- 0.3+ 210930 F52 0.3+ 0.1- 210812 F51 0.1- 0.1- 210904 F51 0.2- 0.2+ 210930 F52 0.2+ 0.0 210812 F51 0.0 0.2+ 210904 F51 0.1- 0.1+ 210930 F52 0.2- 0.3- 210812 F51 0.2- 0.2- 210904 F51 0.3- 0.4- 211004 F52 0.1- 0.2+ 210812 F51 0.2+ 0.1- 210905 T09 0.1+ 0.0 211006 F51 0.2+ 0.0 210817 F51 0.4+ 0.1- 210906 T09 0.1+ 0.1+ 211006 F51 0.0 0.2+ 210817 F51 0.2+ 0.3+ 210909 F51 0.3- 0.1- 211119 F51 0.2- 0.1- 210817 F51 0.3- 0.3- 210912 G96 0.3- 0.2- 211207 H06 (2.6+ 0.3+) 210820 F51 0.6+ 0.1+ 210912 G96 0.2- 0.4- 211207 H06 2.0+ 0.4- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 Dec. 7