Nakano Note (Nakano wa Kangaeru noda) NK 3844 P/2019 A1 (PANSTARRS)

The following improved orbital elements, by S. Nakano, are from 59 observations 2018 Dec. 4 to 2019 Feb. 28. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.39 arc second. Epoch = 2018 Oct. 9.0 TT T = 2018 Oct. 11.05231 +/- 0.00267 (m.e.) TT Peri. = 150.84947 +/- 0.00140 Node = 312.29959 +/- 0.00012 (2000.0) Inc. = 13.74299 +/- 0.00014 q = 2.2116592 +/- 0.0000208 AU e = 0.5689612 +/- 0.0000215 a = 5.1309985 +/- 0.0002599 AU n' = 0.08480105 +/- 0.00000644 P = 11.623 +/- 0.0008830 years (+/- 0.32 day) The predicted orbit for the 2030 return is as follows: T = 2030 May 8.19283 TT Epoch = 2030 May 19.0 TT Peri. = 150.85660 e = 0.5694187 Node = 312.16047 (2000.0) a = 5.1075629 AU Inc. = 13.76852 n'= 0.08538537 q = 2.1992212 AU P = 11.543 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2018/ 190105 568 0.0 0.0 190130 703 1.3- 1.7+ 181204 G96 0.4+ 0.1+ 190106 L01 0.4- 0.5+ 190130 703 1.7- 0.2+ 181204 G96 0.2+ 0.3- 190106 L01 0.3- 0.0 190130 703 0.6- 0.5+ 181204 G96 0.2+ 0.1+ 190107 L01 1.3- 0.4+ 190130 703 0.4+ 0.4+ 181204 G96 0.0 0.1- 190107 Q62 1.2- 0.4- 190204 F52 0.1+ 0.0 181220 F51 0.2+ 0.0 190107 Q62 0.8- 0.7- 190204 F52 0.2+ 0.1- 181220 F51 0.2- 0.2- 190116 F51 0.1+ 0.0 190204 F52 0.2+ 0.1- 181220 F51 0.2- 0.3+ 190116 F51 0.1+ 0.0 190204 F52 0.1+ 0.2- 181220 F51 0.1- 0.0 190116 F51 0.1+ 0.1- 190205 461 0.1+ 0.4- 2019/ 190116 F51 0.1+ 0.0 190205 461 0.1+ 0.2+ 190103 F51 0.1+ 0.0 190119 G96 0.4+ 0.1- 190205 461 0.1- 0.0 190103 F51 0.1+ 0.0 190119 G96 0.1+ 0.2+ 190211 G96 0.0 0.3+ 190103 F51 0.1+ 0.0 190119 G96 0.2- 0.0 190211 G96 0.0 0.1+ 190103 F51 0.1+ 0.0 190119 G96 1.1- 0.2+ 190211 G96 0.1- 0.3+ 190104 I47 0.0 0.6- 190127 G96 0.2- 0.2+ 190211 G96 0.0 0.3+ 190104 I47 0.4- 0.0 190127 G96 0.6- 0.6+ 190228 G96 0.2- 0.0 190104 568 0.0 0.1- 190127 G96 0.5- 0.7+ 190228 G96 0.1+ 0.0 190104 568 0.0 0.1- 190127 G96 0.2- 0.3+ 190228 G96 0.1+ 0.0 190104 568 0.0 0.1- 190129 703 1.9- 0.0 190228 G96 0.2- 0.1- 190105 568 0.0 0.0 190129 703 1.0- 1.3- 190105 568 0.1+ 0.2+ 190129 703 0.3- 0.1+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2019 June 10

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