Nakano Note (Nakano wa Kangaeru noda) NK 4571 P/Christensen (2005 T2 = 2012 V5 = 2020 OV62)
The following improved orbital elements, by S. Nakano, are from 129 observations 2005 to 2020. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.50 arc second. The residuals on 2012 Aug. 3 observation were +1.03 deg for Right Ascension and +0.27 deg for Declination with the delta-T correction = -1.89 days, also residuals on 2020 July 31 observations were +1.02 deg for Right Ascension and +0.29 deg for Declination with the delta-T correction = -3.29 days from the predictions in NK 1398 and NK 3440 (= HICQ 2011, HICQ 2019). The comet has passed 2.69 AU from Jupiter on 2019 Sept. 10 and will pass 0.41 AU from Jupiter on 2037 Nov. 12 UT. See the previous orbits in NK 1398 (= YC 2491), NK 3440 and CBET 5074 (same orbit). The MPC is missing two obsevations below. PK05T020 C2019 06 07.14674814 44 24.25 -21 13 44.8 22.6 g W84 PK05T020 C2019 06 23.10796914 38 24.10 -19 55 21.9 22.1 r W84 Epoch = 2020 Apr. 21.0 TT T = 2020 Apr. 5.28206 +/- 0.00027 (m.e.) TT Peri. = 58.85143 +/- 0.00015 Node = 260.15574 +/- 0.00012 (2000.0) Inc. = 8.29143 +/- 0.00001 q = 2.2453221 +/- 0.0000005 AU e = 0.4161782 +/- 0.0000001 a = 3.8459031 +/- 0.0000012 AU n' = 0.13067923 +/- 0.00000006 P = 7.542 +/- 0.0000034 years T = 2005 Apr. 11.35661 TT Epoch = 2005 Apr. 20.0 TT Peri. = 58.37421 e = 0.4216303 Node = 260.62685 (2000.0) a = 3.8234650 AU Inc. = 8.33731 n'= 0.13183126 q = 2.2113761 AU P = 7.476 years T = 2012 Oct. 5.48154 TT Epoch = 2012 Sept.30.0 TT Peri. = 58.69305 e = 0.4215529 Node = 260.45761 (2000.0) a = 3.8199485 AU Inc. = 8.33672 n'= 0.13201334 q = 2.2096381 AU P = 7.466 years The predicted orbit for the 2027 return is as follows: T = 2027 Oct. 24.80983 TT Epoch = 2027 Nov. 11.0 TT Peri. = 58.87862 e = 0.4144047 Node = 260.11099 (2000.0) a = 3.8568499 AU Inc. = 8.27914 n'= 0.13012327 q = 2.2585533 AU P = 7.574 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2005/ 051014 673 0.0 0.1- 2019/ 051007 G96 0.6+ 0.5+ 051014 673 0.4+ 0.2+ 190607 W84 0.3+ 0.1- 051007 G96 0.0 0.9+ 051014 673 0.4+ 0.0 190623 W84 0.3+ 0.0 051007 G96 0.1- 0.8+ 051020 673 0.2+ 0.4+ 2020/ 051007 G96 0.4- 0.3+ 051020 673 0.0 0.2- 200731 G96 0.1+ 0.5- 051007 G96 0.3- 1.1+ 051020 673 0.1- 0.1- 200731 G96 0.5- 0.1+ 051007 G96 0.3+ 1.0+ 051020 673 0.2+ 0.1- 200731 G96 0.2+ 0.5- 051007 G96 1.2- 0.8+ 051024 413 0.2+ 0.0 200731 G96 0.3- 0.4- 051007 G96 0.2- 0.9+ 051024 413 0.0 0.3- 200827 G96 0.7+ 0.5- 051007 G96 0.2- 1.5+ 051026 215 (3.5+ 7.8-) 200827 G96 0.0 0.1- 051007 G96 0.0 1.6+ 051029 G96 0.6+ 0.0 200910 F51 0.0 0.1+ 051007 G96 0.3- 1.3+ 051029 G96 0.1- 0.1- 200910 F51 0.0 0.2- 051007 G96 0.0 1.3+ 051029 G96 0.2- 0.4- 200910 F51 0.3+ 0.0 051007 G96 0.4- 1.3+ 051029 G96 0.0 0.4- 200910 F51 0.1- 0.1- 051007 G96 0.7- 1.4+ 051030 204 0.3+ 0.3- 200914 F52 0.0 0.0 051007 G96 0.4- 1.5+ 051030 204 1.1- 0.6- 200914 F52 0.1- 0.1+ 051007 G96 0.7- 1.2+ 051101 213 0.2+ 0.4+ 200914 F52 0.2+ 0.3- 051008 682 0.9- 1.2- 051101 213 0.4+ 0.7+ 200914 F52 0.3- 0.3- 051008 682 0.9- 0.9- 051101 213 0.4+ 0.0 200917 F51 0.1+ 0.2- 051008 682 0.9- 0.9- 051106 673 0.0 0.6+ 200917 F51 0.1+ 0.1- 051009 E12 0.1+ 0.3+ 051106 673 0.2+ 0.4+ 200917 F51 0.0 0.0 051009 J95 0.4- 0.4+ 051106 673 0.3- 0.6+ 200919 G96 0.1- 0.6- 051009 J95 0.4- 0.6- 051106 673 0.1- 0.8+ 200919 G96 1.2+ 0.1- 051009 J95 0.1- 0.8- 051125 G96 0.2- 0.5+ 200919 G96 0.1- 0.2- 051010 649 0.7+ 1.1- 051125 G96 0.1- 0.4+ 200919 G96 0.9- 0.3- 051010 649 0.6+ 0.1+ 051125 G96 0.4- 0.1- 200927 G96 0.2+ 0.5- 051010 649 0.1- 0.5- 051125 G96 0.3- 0.5+ 200927 G96 0.4+ 0.1- 051010 649 0.2+ 1.8- 2012/ 200927 G96 0.7+ 0.4+ 051010 649 0.5+ 0.9- 120803 F51 0.1+ 0.1+ 200927 G96 0.6+ 0.2- 051010 651 1.6+ 0.5+ 120808 F51 0.0 0.4+ 201007 G96 0.3- 0.2+ 051010 651 1.0+ 0.9- 120808 F51 0.1- 0.4+ 201007 G96 0.1+ 0.3- 051010 A50 0.3- 0.2+ 120808 F51 0.2+ 0.2+ 201007 G96 0.3+ 0.4- 051010 A50 1.2- 0.3+ 120808 F51 0.0 0.4+ 201007 G96 0.5+ 0.6- 051011 926 0.1+ 0.0 121105 F51 0.3- 0.1+ 201014 G96 0.0 0.3+ 051011 682 0.8- 0.3+ 121105 F51 0.0 0.1- 201014 G96 0.4+ 0.0 051011 291 0.1+ 0.1- 121105 F51 0.2- 0.0 201014 G96 0.1- 0.4- 051011 291 0.2- 0.2+ 121105 F51 0.1+ 0.0 201014 G96 0.1- 0.5- 051011 291 0.0 0.0 121105 F51 0.1- 0.2+ 201023 G96 0.3+ 0.0 051011 682 1.9- 0.2- 121105 F51 0.0 0.2+ 201023 G96 0.3+ 0.5- 051011 682 0.7- 0.5- 121105 F51 0.0 0.2- 201023 G96 0.1+ 0.5- 051012 152 1.1+ 0.4+ 121105 F51 0.1+ 0.1- 201023 G96 0.1+ 0.2+ 051012 152 0.4+ 1.9+ 2013/ 201114 G96 0.2- 0.1+ 051012 152 0.9+ 0.2+ 131004 568 0.5- 0.0 201114 G96 0.2- 0.2+ 051012 152 0.9+ 0.2+ 131004 568 0.5- 0.1+ 201114 G96 0.5- 0.4- 051012 152 (2.6+ 0.4+) 131004 568 0.3- 0.2+ 051014 673 0.1+ 0.3+ 131004 568 0.2- 0.1+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 Nov. 25