Nakano Note (Nakano wa Kangaeru noda) NK 3911 386P/PANSTARRS (2011 U1)
The following revised orbital elements, by S. Nakano, are from 78 observations 2004 to 2019. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.38 arc second. The 2004 observations were found by Maik Meyer in 2012, which was the delta-T correction = -7.2 days from my orbit with residuals of +3.13 deg for R. A. and +0.09 deg for Decl.. See in NK 2184. Residuals of recovery observations made at F51 in 2019 September were -12" for R. A. and -3" for Decl. from the prediction in NK 3414 (= HICQ 2019) with the delta-T correction = +0.015 day. The comet has passed 0.81 AU from Jupiter on 2010 Mar. 13 and will pass 0.63 AU from Jupiter on 2033 Jan. 15 UT. See the previous orbits in NK 2184, NK 3414, NK 3908 and CBET 4693 (this orbit). Epoch = 2020 Aug. 19.0 TT T = 2020 Aug. 19.38289 +/- 0.00029 (m.e.) TT Peri. = 353.25956 +/- 0.00006 Node = 134.94734 +/- 0.00010 (2000.0) Inc. = 15.22934 +/- 0.00001 q = 2.3682319 +/- 0.0000003 AU e = 0.4164509 +/- 0.0000001 a = 4.0583247 +/- 0.0000007 AU n' = 0.12055463 +/- 0.00000003 P = 8.176 +/- 0.0000021 years T = 2003 Dec. 21.16304 TT Epoch = 2003 Dec. 27.0 TT Peri. = 348.53292 e = 0.3933174 Node = 137.10109 (2000.0) a = 4.2002652 AU Inc. = 15.70780 n'= 0.11449566 q = 2.5482279 AU P = 8.608 years T = 2012 June 20.67922 TT Epoch = 2012 June 2.0 TT Peri. = 353.15259 e = 0.4176639 Node = 135.00635 (2000.0) a = 4.0459458 AU Inc. = 15.24327 n'= 0.12110832 q = 2.3561001 AU P = 8.138 years The predicted orbit for the 2028 return is as follows: T = 2028 Oct. 14.24398 TT Epoch = 2028 Sept.26.0 TT Peri. = 353.29272 e = 0.4175688 Node = 134.90364 (2000.0) a = 4.0433562 AU Inc. = 15.24742 n'= 0.12122469 q = 2.3549767 AU P = 8.130 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2004/ 111028 C32 0.5- 0.3- 120109 204 0.6+ 0.5+ 040214 608 0.4- 0.0 111030 H06 0.1+ 0.1- 120125 372 0.6+ 0.1+ 040214 608 0.3+ 1.8- 111030 H06 0.1+ 0.2- 120125 372 0.4+ 0.4+ 040214 608 0.1+ 1.2- 111030 H06 0.3- 0.5- 120125 372 0.6+ 0.1- 040219 608 0.1- 1.5+ 111104 C32 0.3- 0.2+ 120126 215 (2.8+ 0.3+) 2011/ 111104 C32 0.1- 0.4+ 120126 215 (3.3+ 0.7+) 111023 F51 0.1- 0.1+ 111117 204 0.3- 0.3- 2013/ 111023 F51 0.1+ 0.1- 111117 204 0.2- 0.1+ 130124 F51 0.6- 0.0 111023 F51 0.1+ 0.0 111121 215 0.2+ 0.3- 130124 F51 0.9+ 0.3- 111023 F51 0.0 0.0 111121 215 0.0 0.0 130402 F51 0.3+ 0.1- 111024 291 0.2- 0.2+ 111121 215 0.1+ 0.1+ 130402 F51 0.4+ 0.1+ 111024 291 0.6- 0.0 111123 H06 0.0 0.9- 130402 F51 0.0 0.0 111024 291 0.4- 0.6+ 111123 H06 0.6- 0.3- 130402 F51 0.2- 0.0 111024 F65 0.0 0.1+ 111124 568 0.1- 0.0 130412 F51 0.4- 0.3+ 111024 F65 0.1- 0.2+ 111124 568 0.1- 0.0 130412 F51 0.2- 0.2+ 111024 F65 0.1- 0.1+ 111124 568 0.1- 0.0 130517 F51 0.0 0.1- 111024 F65 0.2- 0.1+ 111203 J47 0.6- 0.3+ 2019/ 111024 F65 0.1- 0.3+ 111203 J47 0.6- 0.1+ 190926 F51 0.2+ 0.1+ 111024 568 0.0 0.1+ 111203 J47 0.1- 0.1+ 190926 F51 0.1+ 0.1- 111024 568 0.0 0.1+ 111218 J24 0.5+ 0.2- 190926 F51 0.1- 0.2+ 111024 568 0.0 0.0 111218 J24 0.8+ 0.3+ 190926 F51 0.4+ 0.3- 111026 926 0.3+ 0.2- 111218 J24 0.0 1.1+ 191019 F51 0.1- 0.0 111026 926 0.4- 0.2- 111221 130 0.8+ 0.3+ 191019 F51 0.1- 0.1+ 111026 926 0.0 0.2- 111221 130 1.1+ 0.2+ 191019 F51 0.1- 0.0 111026 926 0.1- 0.1- 111229 C32 0.4+ 0.2- 191021 F51 0.1- 0.1- 111026 926 0.1+ 0.2- 111229 C32 0.2+ 0.3+ 191021 F51 0.0 0.0 111026 926 0.6+ 0.8- 111229 C32 0.6+ 0.2- 191021 F51 0.2- 0.1+ 111028 C32 0.1- 0.4- 2012/ Following observations 111028 C32 0.4+ 0.2- 120109 204 0.2- 0.5- were not included. 191103 F51 0.0 0.2+ ( ) -------- Rejected Obs. 191103 F51 0.0 0.1+ 191103 F51 0.1+ 0.3+ 191103 F51 0.2- 0.1+
Associate of the CBAT Syuichi Nakano 2019 Nov. 5