Nakano Note (Nakano wa Kangaeru noda) NK 4137 P/Lemmon (2012 SB6 = 2020 M2)
The following improved orbital elements, by S. Nakano, are from 195 observations 2012 to 2020. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.60 arc second. Residuals were +116" for Right Ascension and +59" for Declination from the prediction in NK 2419 (= HICQ 2019/2020) with the delta-T correction = -0.14 day. Comet has passed 0.14 AU from Jupiter in 1928 September just before 1928 perihelion, before this close approach, orbit was q= 4.58 AU and e= 0.20. See the previous orbits in NK 2419 and CBET 4807 (same orbit). Epoch = 2020 May 31.0 TT T = 2020 June 19.24492 +/- 0.00412 (m.e.) TT Peri. = 14.38703 +/- 0.00136 Node = 8.21117 +/- 0.00020 (2000.0) Inc. = 10.92881 +/- 0.00007 q = 2.2768653 +/- 0.0000144 AU e = 0.4047543 +/- 0.0000029 a = 3.8250847 +/- 0.0000304 AU n' = 0.13174753 +/- 0.00000157 P = 7.481 +/- 0.0000892 years T = 2012 Oct. 31.96983 TT Epoch = 2012 Nov. 9.0 TT Peri. = 12.78611 e = 0.3846227 Node = 9.55707 (2000.0) a = 3.9105237 AU Inc. = 10.98961 n'= 0.12745348 q = 2.4064476 AU P = 7.733 years The predicted orbit for the 2027 return is as follows: T = 2027 Dec. 21.34170 TT Epoch = 2027 Dec. 21.0 TT Peri. = 14.57900 e = 0.4040420 Node = 8.14101 (2000.0) a = 3.8332138 AU Inc. = 10.91709 n'= 0.13132866 q = 2.2844346 AU P = 7.505 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2012/ 121016 C32 0.1+ 0.1- 121107 511 0.1+ 0.1- 120914 703 1.0- 0.7- 121016 C32 0.2+ 0.2- 121107 511 0.1+ 0.0 120914 703 0.2- 0.0 121016 C32 0.0 0.1- 121107 511 0.1+ 0.5+ 120914 703 1.0- 0.9+ 121016 C32 0.1+ 0.1- 121107 958 1.5- 1.2- 120914 703 (2.4- 0.3+) 121016 A71 0.2- 1.0+ 121107 958 1.4- 0.3- 120917 G96 0.6- 0.1- 121016 A71 1.7- 0.0 121107 958 (4.4- 2.7-) 120917 G96 0.0 0.1+ 121019 215 0.3- 0.2- 121111 958 0.0 0.6- 120917 G96 1.0- 0.0 121019 215 0.0 0.3- 121111 958 1.1- 1.6- 120917 G96 0.3- 0.0 121019 215 0.0 0.2- 121111 958 0.2- 0.1- 120918 691 0.8- 0.1+ 121020 D95 1.0- 1.2+ 121111 561 1.4+ 1.0+ 120918 691 0.6- 0.2+ 121020 D95 0.9+ 0.7+ 121112 561 0.4- 0.7- 120918 691 0.4- 0.0 121020 D88 1.0+ 0.6+ 121112 561 0.4- 0.4- 120919 704 0.2+ 0.4- 121020 D88 0.8+ 0.4+ 121112 D88 0.9+ 1.5- 120919 704 0.2+ 0.2+ 121020 D88 0.4+ 0.2- 121112 D88 0.0 0.4- 120919 704 1.0+ 0.8+ 121020 246 0.6- 0.0 121112 D88 0.3+ 0.0 120919 704 0.4- 0.3+ 121020 246 0.6- 0.6- 121112 B51 0.5- 0.9+ 120919 704 0.6+ 0.1+ 121020 246 0.8- 0.1- 121112 B51 0.2- 0.8+ 120922 691 0.9- 0.2- 121020 246 0.3+ 0.0 121112 958 0.7+ 1.4+ 120922 691 1.5- 0.2- 121020 246 0.5- 0.2- 121112 958 1.0- 0.4- 120922 691 1.1- 0.2- 121020 246 0.6- 0.0 121112 958 0.5- 0.6- 120924 H06 0.1+ 0.2- 121020 246 0.4- 0.1+ 121113 704 0.1+ 0.5+ 120924 H06 0.1- 0.2- 121020 157 0.2+ 0.1- 121113 704 0.4+ 1.4- 120924 H06 0.4- 0.1+ 121020 246 0.5- 0.2+ 121113 704 (0.7+ 2.6+) 120925 703 0.9- 0.1+ 121020 246 0.9- 0.0 121113 704 0.0 1.4+ 120925 703 0.6- 0.3+ 121020 157 0.0 0.0 121115 511 0.1- 0.3+ 120925 703 0.9- 0.8+ 121020 157 0.5+ 0.2+ 121115 511 0.1+ 0.0 120925 703 0.6- 0.2+ 121020 157 0.2+ 0.2- 121116 958 (1.9- 2.4-) 121004 G96 0.0 0.0 121020 130 0.0 0.1- 121116 958 (2.6- 2.3+) 121004 G96 0.2- 0.2- 121020 130 0.2+ 0.1- 121116 958 (4.4- 0.3-) 121004 G96 0.3- 0.0 121020 130 0.0 0.6- 121119 958 1.1- 0.2- 121004 G96 0.4- 0.1- 121020 130 0.2+ 0.7- 121119 958 1.9- 0.9- 121006 703 0.5- 0.4- 121020 130 0.7+ 0.2+ 121119 958 0.5- 0.8- 121006 703 1.4- 0.6- 121020 130 1.0+ 0.2+ 121121 J01 0.0 0.1+ 121006 703 0.1+ 0.4- 121020 130 0.2- 0.3- 121121 J01 0.8- 0.6+ 121006 703 1.2- 0.5+ 121020 130 0.1+ 0.4- 121125 C10 0.2- 0.1+ 121008 F51 0.3+ 0.1+ 121021 G96 0.5- 0.2- 121125 C10 0.7- 1.0- 121008 F51 0.3+ 0.1+ 121021 G96 0.1- 0.3- 121203 A24 1.3+ 1.7- 121008 F51 0.3+ 0.1+ 121021 G96 0.3- 0.3- 121203 A24 0.7+ 0.3- 121009 568 0.4+ 0.0 121021 G96 0.3- 0.3- 121203 A24 0.1+ 0.2+ 121009 568 0.4+ 0.0 121022 F51 0.2+ 0.2+ 121203 A24 0.4+ 0.1+ 121009 568 0.4+ 0.0 121022 F51 0.2+ 0.1+ 121205 703 0.1+ 0.6- 121010 703 0.4- 0.2- 121022 F51 0.2+ 0.2+ 121205 703 1.2+ 0.5- 121010 703 0.1+ 0.1- 121022 958 0.3+ 0.4+ 121205 703 1.2+ 0.6+ 121010 703 1.2- 0.3- 121022 C10 0.1- 0.2+ 121205 703 0.7+ 0.4+ 121010 703 1.2- 0.6- 121022 958 0.9- 0.9- 121205 B70 0.8+ 0.3- 121010 G96 1.2- 0.6- 121022 C10 0.4- 0.1- 121205 A24 0.5- 0.5+ 121010 G96 0.7- 0.6- 121023 958 (0.6+ 2.6-) 121205 A24 1.3+ 0.8+ 121010 G96 0.4- 0.6- 121023 B96 1.3+ 0.1+ 121205 B70 0.4- 1.7- 121010 G96 0.5- 0.4- 121023 C10 0.3- 0.1+ 121205 B70 (2.4+ 0.9+) 121011 B96 0.4+ 0.6- 121023 B96 1.2+ 0.5+ 121205 511 0.4+ 0.1+ 121011 B96 0.4+ 0.0 121023 B96 0.4+ 0.1+ 121205 511 0.0 0.1+ 121011 B96 1.0- 0.8- 121023 B96 0.3+ 0.1+ 121209 A24 1.1+ 1.8+ 121011 B96 0.1- 0.8- 121023 B96 (2.5+ 2.0+) 121209 A24 0.1- 0.0 121011 B96 0.2- 1.0- 121023 B96 1.2- 0.7- 121211 703 0.9- 0.3+ 121011 B96 1.1+ 0.1- 121023 B96 0.0 0.1+ 121211 703 0.3+ 0.8+ 121011 B96 0.2- 1.7- 121023 372 0.8- 0.0 121211 703 0.3+ 0.2- 121011 372 0.0 0.1+ 121023 372 0.3- 0.2+ 121211 703 1.3- 0.0 121011 372 0.1+ 0.2+ 121103 349 0.6- 0.1+ 2013/ 121012 900 0.2+ 0.6- 121103 349 0.3- 0.4- 130205 H06 0.5- 0.4- 121012 900 0.1+ 0.0 121104 703 0.0 0.2- 130205 H06 0.4- 1.1+ 121015 704 0.4+ 0.4+ 121104 703 0.8+ 0.6+ 130206 291 0.5- 0.4+ 121015 704 0.2+ 0.5- 121104 703 0.6+ 0.3+ 130206 291 0.1+ 0.5+ 121015 704 0.9- 0.1+ 121104 703 0.3- 0.5+ 130206 291 0.6- 0.5+ 121015 704 0.1- 0.8+ 121105 C32 0.0 0.4+ 2020/ 121015 704 0.7- 0.5+ 121105 C32 0.0 0.4+ 200629 Q62 0.3+ 0.1- 121015 372 0.2+ 0.3- 121105 C32 0.1- 0.4+ 200629 Q62 0.1- 0.3+ 121015 372 0.4+ 0.2- 121106 958 0.8+ 0.5+ 200630 H06 0.1- 0.2+ 121016 349 0.4+ 0.1+ 121106 958 0.1+ 0.6- 200630 H06 0.0 0.1+ 121016 349 0.3- 0.7+ 121106 958 0.2- 0.6+ 200630 H06 0.4- 0.2+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2020 June 30