Nakano Note (Nakano wa Kangaeru noda) NK 4287 P/2019 A4 (PANSTARRS)
The following improved orbital elements, by S. Nakano, are from 65 observations 2018 Dec. 31 to 2019 Mar. 2. 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. See an orbit in HICQ 2020 (= same orbit). Epoch = 2018 Nov. 18.0 TT T = 2018 Dec. 5.02014 +/- 0.22949 (m.e.) TT Peri. = 341.77802 +/- 0.06332 Node = 119.30074 +/- 0.00071 (2000.0) Inc. = 13.31791 +/- 0.00166 q = 2.3791944 +/- 0.0000923 AU e = 0.0896384 +/- 0.0000160 a = 2.6134607 +/- 0.0001113 AU n' = 0.23328140 +/- 0.00001490 P = 4.225 +/- 0.0002699 years (+/- 0.10 day) The predicted orbit for the 2023 return is as follows: T = 2023 Mar. 3.09360 TT Epoch = 2023 Feb. 25.0 TT Peri. = 342.99945 e = 0.0870908 Node = 119.24352 (2000.0) a = 2.6132508 AU Inc. = 13.30507 n'= 0.23330951 q = 2.3856606 AU P = 4.224 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2018/ 190112 G40 1.2- 0.8+ 190117 G96 0.5- 0.3+ 181231 G96 1.2- 0.6+ 190112 L27 1.3- 0.3+ 190117 G96 0.0 0.4- 181231 G96 0.7- 0.4+ 190112 691 1.2- 0.4+ 190117 G96 0.4- 0.0 181231 G96 0.8- 0.5+ 190112 691 0.8- 0.2+ 190117 I52 0.7- 0.7- 181231 G96 1.2- 0.3+ 190112 691 1.1- 0.5+ 190117 I52 0.4+ 0.9+ 2019/ 190112 I52 0.2- 0.4- 190117 I52 0.4- 0.4- 190103 F51 0.4+ 0.0 190112 I52 1.0- 0.2- 190117 I52 0.6+ 0.5- 190103 F51 0.1+ 0.1- 190112 I52 1.4- 0.1+ 190126 G96 0.1+ 0.0 190103 F51 0.0 0.0 190112 I52 1.2- 0.5+ 190126 G96 0.4- 0.6- 190110 F51 0.3+ 0.1- 190112 Q62 0.4- 0.2- 190126 G96 0.0 0.6- 190110 F51 0.1+ 0.1+ 190112 Q62 0.1+ 0.3+ 190126 G96 0.3- 0.4- 190110 F51 0.3+ 0.0 190115 658 0.9- 0.2+ 190129 A71 0.2+ 0.0 190111 691 0.5- 0.2+ 190115 658 0.8- 0.1+ 190129 A71 0.7- 0.1- 190111 691 0.3- 0.2+ 190115 658 0.7- 0.1+ 190129 A71 0.4+ 0.1+ 190111 568 0.5+ 0.1- 190115 658 0.7- 0.3+ 190205 461 1.2+ 0.1+ 190111 568 0.5+ 0.1- 190115 I52 0.3+ 0.1- 190205 461 0.1+ 0.4+ 190111 691 1.6- 0.1+ 190115 I52 0.9- 0.4+ 190205 461 0.9+ 0.1- 190111 568 0.6+ 0.1- 190115 I52 0.2- 0.5- 190208 G96 0.9+ 0.9- 190111 L01 1.1- 0.1+ 190115 I52 0.1+ 0.2+ 190208 G96 0.6+ 0.8- 190111 L01 0.1- 0.4- 190116 K38 1.1- 0.7- 190302 304 0.2- 0.9+ 190111 L27 1.1- 1.0+ 190116 K38 0.4- 1.1- 190302 304 0.2- 0.9+ 190111 G40 1.1- 0.3+ 190116 K38 0.9- 0.4+ 190111 L27 1.4- 0.5+ 190117 G96 1.8- 1.3+ ( ) -------- Rejected Obs.
Associate of the CBAT Late edition Syuichi Nakano 2019 June 11