Nakano Note (Nakano wa Kangaeru noda) NK 4485 P/2021 C2 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 52 observations 2021 Jan. 17 to June 8. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.42 arc second. See an orbit in CBET 4935. Epoch = 2021 Mar. 7.0 TT T = 2021 Feb. 24.82889 +/- 0.12661 (m.e.) TT Peri. = 78.84421 +/- 0.01464 Node = 66.49859 +/- 0.00085 (2000.0) Inc. = 21.92691 +/- 0.00003 q = 4.8902614 +/- 0.0000443 AU e = 0.4874581 +/- 0.0000190 a = 9.5411927 +/- 0.0003644 AU n' = 0.03344260 +/- 0.00000191 P = 29.472 +/- 0.0016886 years (+/- 0.62 day) The predicted orbit for the 2050 return is as follows: T = 2050 Sept.14.70636 TT Epoch = 2050 Oct. 1.0 TT Peri. = 80.55826 e = 0.5002283 Node = 65.29495 (2000.0) a = 9.7174887 AU Inc. = 21.39128 n'= 0.03253666 q = 4.8565259 AU P = 30.292 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2021/ 210215 G96 0.0 0.6- 210314 867 0.5- 0.3- 210117 G96 0.1- 1.3+ 210215 568 0.3+ 0.1- 210314 867 0.1- 0.3- 210117 G96 0.2- 0.8+ 210215 568 0.3+ 0.1- 210402 F52 0.0 0.1+ 210212 F51 0.2+ 0.1- 210215 568 0.3+ 0.1- 210402 F52 0.1+ 0.1+ 210212 F51 0.2+ 0.1- 210216 F51 0.3+ 0.1+ 210402 F52 0.0 0.1- 210212 F51 0.3+ 0.0 210216 F51 0.2- 0.1- 210503 G96 0.0 0.2- 210212 F51 0.0 0.1- 210216 F51 0.1- 0.0 210503 G96 0.3- 0.3- 210214 568 0.3+ 0.1- 210216 F51 0.4+ 0.0 210503 G96 0.3- 0.1- 210214 568 0.3+ 0.1- 210219 H06 0.5- 0.3- 210503 G96 0.2- 0.0 210214 568 0.3+ 0.1- 210219 H06 0.2- 0.1+ 210523 F51 0.0 0.2+ 210214 L01 0.7- 0.2- 210220 H06 1.0+ 0.3- 210523 F51 0.3- 0.3- 210214 L01 0.7- 0.5- 210220 H06 0.8+ 0.2- 210523 F51 0.2+ 0.2- 210214 L01 0.2+ 0.7- 210305 A71 0.8- 0.0 210607 867 0.2- 0.6+ 210214 L01 0.2+ 0.5- 210305 A71 0.2- 0.0 210607 867 (1.2- 2.3+) 210214 L01 0.7- 0.3- 210310 867 0.5- 0.6+ 210607 867 0.6- 0.6+ 210215 G96 0.4- 0.1+ 210310 867 0.4- 0.3+ 210608 867 0.2- 0.7+ 210215 G96 0.2+ 0.4+ 210310 867 0.6- 0.3+ 210608 867 1.7+ 0.8+ 210215 G96 0.8+ 0.2+ 210310 867 0.3- 0.3+ 210608 867 0.6+ 0.2+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 June 22

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