Nakano Note (Nakano wa Kangaeru noda) NK 4755 P/PANSTARRS (2019 A3 = 2022 Ex)

The following improved orbital elements, by S. Nakano, are from 66 observations 2018 to 2022. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.28 arc second. The comet has passed its aphelion in 2021. See the previous orbits in NK 3779 and NK 4450. Epoch = 2024 Feb. 20.0 TT T = 2024 Mar. 2.67589 +/- 0.00227 (m.e.) TT Peri. = 325.71483 +/- 0.00019 Node = 31.29327 +/- 0.00003 (2000.0) Inc. = 15.37515 +/- 0.00003 q = 2.3071890 +/- 0.0000023 AU e = 0.2661321 +/- 0.0000004 a = 3.1438753 +/- 0.0000035 AU n' = 0.17680971 +/- 0.00000030 P = 5.574 +/- 0.0000094 years T = 2018 Aug. 1.80562 TT Epoch = 2018 July 21.0 TT Peri. = 325.47471 e = 0.2648343 Node = 31.33323 (2000.0) a = 3.1468444 AU Inc. = 15.36744 n'= 0.17655953 q = 2.3134520 AU P = 5.582 years The predicted orbit for the 2029 return is as follows: T = 2029 Sept.24.29774 TT Epoch = 2029 Sept.21.0 TT Peri. = 325.58018 e = 0.2706335 Node = 31.03705 (2000.0) a = 3.1387219 AU Inc. = 15.38061 n'= 0.17724533 q = 2.2892788 AU P = 5.561 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2018/ 2019/ 210314 I11 0.3+ 0.4+ 180808 F51 0.2- 0.1- 190103 F51 0.2+ 0.1+ 210314 I11 0.1+ 0.3+ 180808 F51 0.2+ 0.3+ 190103 F51 0.2+ 0.1+ 2022/ 180808 F51 0.2+ 0.1+ 190103 F51 0.1+ 0.1- 220314 I11 0.0 0.0 180808 F51 0.3+ 0.1- 190104 568 0.1+ 0.1+ 220314 I11 0.1- 0.1- 180811 F51 0.1+ 0.3+ 190104 568 0.1+ 0.0 220314 I11 0.1- 0.1- 180811 F51 0.0 0.2- 190104 568 0.0 0.0 220326 I11 0.1+ 0.0 180811 F51 0.2+ 0.2+ 190106 L01 0.5+ 0.8+ 220326 I11 0.1- 0.0 180811 F51 0.0 0.1+ 190106 L01 0.5+ 0.4+ 220326 I11 0.0 0.0 180821 F51 0.1+ 0.0 190106 L01 1.4+ 0.4- 220329 I11 0.0 0.0 180821 F51 0.2- 0.0 190108 658 0.2+ 0.5+ 220329 I11 0.1- 0.1- 180909 W84 0.2+ 0.1- 190108 658 0.1+ 0.3+ 220329 I11 0.0 0.0 180909 W84 0.1+ 0.0 190108 658 0.1+ 0.0 220330 I11 0.1- 0.0 180909 W84 0.0 0.1- 190108 658 0.5+ 0.0 220330 I11 0.0 0.1- 180911 W84 0.0 0.1- 190108 658 0.1- 0.1- 220330 I11 0.1+ 0.0 180911 W84 0.0 0.1- 190110 568 0.1- 0.1- 220331 I11 0.1- 0.1- 180911 W84 0.2+ 0.2- 190110 568 0.1- 0.1- 220331 I11 0.0 0.0 181010 F52 0.2- 0.0 190110 568 0.2- 0.1- 220331 I11 0.0 0.1- 181010 F52 0.2+ 0.1- 190124 H06 1.6+ 0.4+ 220331 I11 0.0 0.0 181010 F52 0.0 0.2- 190124 H06 1.0+ 0.1+ 220401 I11 0.2- 0.2- 181018 F52 0.5- 0.1- 2021/ 220401 I11 0.1- 0.0 181113 F52 0.1- 0.4+ 210308 I11 0.4+ 0.3+ 220401 I11 0.1- 0.1- 181113 F52 0.2- 0.5- 210308 I11 0.3+ 0.2+ 181113 F52 0.2- 0.1- 210314 I11 0.3+ 0.3+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2022 July 3

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