Nakano Note (Nakano wa Kangaeru noda) NK 4470 P/McNaught (2009 U4 = 2020 Hx)

The following improved orbital elements, by S. Nakano, are from 97 observations 2009 to 2020. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.48 arc second. Residuals for the first recovery observations were +1.30 deg for Right Ascension and -0.66 deg for Declination from the prediction in NK 1898 (= HICQ 2020/2021) with the delta-T correction = -6.17 days. Epoch = 2021 Jan. 26.0 TT T = 2021 Jan. 25.85180 +/- 0.00262 (m.e.) TT Peri. = 259.82661 +/- 0.00033 Node = 55.35468 +/- 0.00008 (2000.0) Inc. = 10.07995 +/- 0.00002 q = 1.6465897 +/- 0.0000024 AU e = 0.6758092 +/- 0.0000004 a = 5.0790759 +/- 0.0000096 AU n' = 0.08610473 +/- 0.00000024 P = 11.447 +/- 0.0000325 years T = 2009 Sept. 9.11549 TT Epoch = 2009 Sept. 6.0 TT Peri. = 259.91986 e = 0.6757433 Node = 55.69387 (2000.0) a = 5.0861288 AU Inc. = 10.09325 n'= 0.08592569 q = 1.6492113 AU P = 11.470 years The predicted orbit for the 2032 return is as follows: T = 2032 June 18.41109 TT Epoch = 2032 June 17.0 TT Peri. = 259.76224 e = 0.6747827 Node = 54.99762 (2000.0) a = 5.0911683 AU Inc. = 10.06597 n'= 0.08579814 q = 1.6557359 AU P = 11.488 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2009/ 091025 204 0.3+ 0.2+ 091119 704 0.3+ 0.5- 091011 E12 0.1+ 0.1- 091025 204 0.0 0.0 091119 704 0.3+ 0.5+ 091011 E12 0.7+ 0.7+ 091101 E94 (3.9+ 2.6-) 091122 I10 0.1- 0.0 091011 E12 0.6- 0.1+ 091101 E94 1.3- 0.3- 091122 I10 0.9+ 0.5- 091022 E12 0.2- 0.5- 091101 E94(11.2+ 3.7+) 091122 I10 1.0+ 0.0 091023 E12 0.3- 0.0 091101 E94 (3.4- 0.7-) 091128 H06 0.4+ 0.2+ 091023 E12 0.1- 0.2- 091101 E94 (4.0- 1.2-) 091128 H06 0.4+ 0.1- 091023 E12 0.3+ 0.8- 091101 E94 (2.2- 2.0-) 091205 H06 0.8+ 0.9- 091023 E12 0.2+ 0.5- 091101 E94 0.4- 0.1+ 091205 H06 1.0+ 1.1- 091023 E12 0.1+ 0.0 091105 I10 0.2- 0.3- 091206 349 1.5+ 1.2+ 091023 E12 0.3- 0.5- 091105 I10 0.5+ 0.1+ 091206 349 (2.5+ 1.3+) 091023 I77 0.1+ 1.0- 091105 I10 0.8- 0.8+ 091206 349 1.0+ 0.1+ 091023 I77 0.0 1.2- 091105 D90 0.4- 0.4+ 091207 I10 0.1+ 0.4+ 091023 I77 0.6- 1.4- 091105 D90 0.7- 0.6+ 091207 I10 1.3+ 0.4- 091024 H36 0.0 0.1- 091105 D90 0.2- 0.8+ 091209 415 0.8- 0.5+ 091024 H36 0.5+ 0.2+ 091105 215 0.4+ 1.3+ 091209 415 0.1- 0.6- 091024 H36 0.2+ 0.2+ 091106 I10 1.1- 0.5- 091217 204 0.1- 0.2+ 091024 H36 0.1- 0.6+ 091106 I10 0.3+ 1.1+ 2010/ 091024 H01 0.2- 0.3- 091106 D90 1.0- 0.2+ 100102 349 (0.8- 2.8-) 091024 H01 0.5- 0.4- 091106 D90 0.5- 0.3+ 100102 349 0.2+ 2.0- 091024 G96 0.4+ 0.6+ 091106 D90 0.0 0.3- 100116 349 1.4- 0.6- 091024 G96 0.4+ 0.4+ 091106 D25 0.8- 0.0 100116 349 0.4- 0.5+ 091024 G96 0.7+ 0.1- 091106 D25 0.2+ 0.1- 2020/ 091024 G96 0.9+ 0.9+ 091107 I10 0.2- 0.0 200420 F51 0.1- 0.2+ 091024 H06 0.1- 0.9+ 091108 H47 1.0- 1.2+ 200420 F51 0.2- 0.0 091024 H06 0.4+ 0.9+ 091108 H47 0.4- 1.2+ 200420 F51 0.0 0.0 091024 H01 0.2- 0.3- 091109 E12 0.1- 0.3- 200426 G96 0.2+ 0.7- 091024 H06 0.9+ 0.9+ 091109 E12 0.3- 0.3- 200426 G96 0.1+ 0.0 091024 H01 0.5- 0.5- 091109 204 0.2- 0.1- 200426 G96 0.4+ 0.0 091024 H01 0.2- 0.0 091113 D25 (2.3- 0.1-) 200426 G96 0.3+ 0.7- 091024 854 0.4- 0.2+ 091116 850 1.1+ 0.5- 200429 F51 0.1- 0.1- 091024 854 0.3+ 0.3+ 091116 850 1.3+ 0.4- 200429 F51 0.1+ 0.1- 091024 854 0.7- 0.2+ 091116 850 0.3+ 0.7- 200429 F51 0.1- 0.1- 091024 E12 0.1- 0.2- 091118 E12 0.2- 0.3- 200525 F51 0.0 0.1- 091024 E12 0.4+ 0.2- 091118 E12 0.2- 0.7- 200525 F51 0.0 0.0 091024 E12 0.2+ 0.5- 091119 704 1.0- 0.3- 200525 F51 0.1+ 0.2+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 May 29

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