Nakano Note (Nakano wa Kangaeru noda) NK 4785 P/Sheppard-Tholen (2021 R9 = 2008 Tx)
The following improved orbital elements, by S. Nakano, are from 46 observations 2007 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 0.45 AU from Jupiter on 1931 Jan., 3.98 AU from Saturn on 2018 May 6 and 2.89 AU from Jupiter on 2020 Nov. 18 UT. Also comet will pass 0.46 AU from Jupiter on 2037 Mar. 7 UT. See a orbit in CBET 5153 (same orbit). The following objects were found from an orbit from 2021/2022 observations. Residuals were +99" for Right Ascension and +42" for Declination with delta-T correction = -0.22 day. 8TAF3D5* C2008 10 09.35032 01 42 23.58 +20 37 49.9 22.6 Vr G96 8TAF3D5 C2008 10 09.35615 01 42 23.32 +20 37 48.7 21.7 Vr G96 8TAF3D5 C2008 10 09.36197 01 42 23.14 +20 37 48.3 21.7 Vr G96 8TAF3D5 C2008 10 09.36776 01 42 23.00 +20 37 47.6 21.5 Vr G96 8U864FE* C2008 10 29.37935 01 31 46.56 +19 42 41.0 20.9 Vr G96 8U864FE C2008 10 29.38719 01 31 46.27 +19 42 39.9 20.9 Vr G96 8U864FE C2008 10 29.39498 01 31 46.02 +19 42 38.4 21.9 Vr G96 8U864FE C2008 10 29.40272 01 31 45.80 +19 42 36.6 21.6 Vr G96 Epoch = 2022 Aug. 9.0 TT T = 2022 Aug. 18.01297 +/- 0.09284 (m.e.) TT Peri. = 97.52837 +/- 0.01087 Node = 302.69606 +/- 0.00078 (2000.0) Inc. = 7.43286 +/- 0.00005 q = 4.6269639 +/- 0.0000800 AU e = 0.1804494 +/- 0.0000152 a = 5.6457330 +/- 0.0001430 AU n' = 0.07347229 +/- 0.00000279 P = 13.415 +/- 0.0005097 years (+/- 0.19 day) T = 2009 Jan. 3.51732 TT Epoch = 2009 Jan. 9.0 TT Peri. = 94.39829 e = 0.1824453 Node = 302.89942 (2000.0) a = 5.6639846 AU Inc. = 7.42388 n'= 0.07311744 q = 4.6306172 AU P = 13.480 years The predicted orbit for the 2035 return is as follows: T = 2035 Jan. 27.05451 TT Epoch = 2035 Feb. 2.0 TT Peri. = 83.34197 e = 0.2489151 Node = 292.73047 (2000.0) a = 6.1829373 AU Inc. = 7.18753 n'= 0.06410794 q = 4.6439109 AU P = 15.374 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2007/ 210905 F52 0.2- 0.2- 211002 F52 0.0 0.0 070606 568 0.2- 0.5- 210905 F52 0.0 0.0 211007 G96 0.7- 0.3- 2008/ 210905 T09 0.1+ 0.1+ 211007 G96 0.3- 0.5- 081009 G96 0.4+ 0.2+ 210906 T09 0.1+ 0.0 211007 G96 0.3+ 0.0 081009 G96 0.6- 0.3- 210910 F52 0.0 0.4+ 211007 G96 0.1- 0.2+ 081009 G96 0.6- 0.1+ 210927 F51 0.2- 0.1- 211027 F52 0.4+ 0.0 081009 G96 0.1+ 0.1+ 210927 F51 0.1+ 0.0 211031 F51 0.1- 0.0 081029 G96 0.3+ 0.1+ 211002 V00 0.1- 0.1+ 211031 F51 0.0 0.0 081029 G96 0.3- 0.6+ 211002 V00 0.1- 0.1+ 211031 F51 0.0 0.0 081029 G96 0.4- 0.6+ 211002 V00 0.1+ 0.2- 211031 F51 0.1- 0.1- 081029 G96 0.1- 0.3+ 211002 V00 0.1- 0.2- 211107 F52 0.2+ 0.1+ 081204 645 0.1+ 0.6+ 211002 F52 0.0 0.0 211107 F52 0.2+ 0.0 081204 645 0.2+ 0.2+ 211002 F52 0.5- 0.9- 211107 F52 0.3+ 0.2+ 081204 645 0.1+ 0.4+ 211002 F52 0.3- 0.2- 211107 F52 0.2+ 0.2- 2021/ 211002 F52 0.1+ 0.2- 2022/ 210622 F51 0.2+ 0.6+ 211002 F52 0.1+ 0.2+ 220125 F52 0.2+ 0.1- 210811 F51 0.1+ 0.2+ 211002 F52 0.5- 0.3+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2022 Aug. 6