Nakano Note (Nakano wa Kangaeru noda) NK 3908 386P/PANSTARRS (2011 U1)
The following improved orbital elements, by S. Nakano, are from 63 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 (one night) observations made at F51 in 2019 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 and NK 3414. Epoch = 2020 Aug. 19.0 TT T = 2020 Aug. 19.38553 +/- 0.00109 (m.e.) TT Peri. = 353.25896 +/- 0.00021 Node = 134.94748 +/- 0.00010 (2000.0) Inc. = 15.22938 +/- 0.00002 q = 2.3682616 +/- 0.0000111 AU e = 0.4164436 +/- 0.0000027 a = 4.0583253 +/- 0.0000267 AU n' = 0.12055460 +/- 0.00000119 P = 8.176 +/- 0.0000806 years T = 2003 Dec. 21.15962 TT Epoch = 2003 Dec. 27.0 TT Peri. = 348.53220 e = 0.3933091 Node = 137.10123 (2000.0) a = 4.2002713 AU Inc. = 15.70783 n'= 0.11449541 q = 2.5482664 AU P = 8.608 years T = 2012 June 20.68128 TT Epoch = 2012 June 2.0 TT Peri. = 353.15198 e = 0.4176567 Node = 135.00648 (2000.0) a = 4.0459464 AU Inc. = 15.24331 n'= 0.12110830 q = 2.3561298 AU P = 8.138 years The predicted orbit for the 2028 return is as follows: T = 2028 Oct. 14.24735 TT Epoch = 2028 Sept.26.0 TT Peri. = 353.29212 e = 0.4175616 Node = 134.90377 (2000.0) a = 4.0433568 AU Inc. = 15.24745 n'= 0.12122466 q = 2.3550063 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/ 111026 926 0.0 0.2- 111203 J47 0.6- 0.0 040214 608 0.4- 0.3+ 111026 926 0.1- 0.1- 111203 J47 0.1- 0.1+ 040214 608 0.3+ 1.5- 111026 926 0.1+ 0.2- 111218 J24 0.4+ 0.2- 040214 608 0.1+ 0.9- 111026 926 0.6+ 0.8- 111218 J24 0.7+ 0.2+ 040219 608 0.1- 1.9+ 111028 C32 0.1- 0.4- 111218 J24 0.1- 1.1+ 2011/ 111028 C32 0.4+ 0.2- 111221 130 0.8+ 0.3+ 111023 F51 0.1- 0.1+ 111028 C32 0.5- 0.3- 111221 130 1.1+ 0.2+ 111023 F51 0.1+ 0.1- 111030 H06 0.2+ 0.2- 111229 C32 0.3+ 0.2- 111023 F51 0.1+ 0.0 111030 H06 0.1+ 0.2- 111229 C32 0.1+ 0.3+ 111023 F51 0.0 0.0 111030 H06 0.3- 0.5- 111229 C32 0.5+ 0.2- 111024 291 0.2- 0.2+ 111104 C32 0.2- 0.2+ 2012/ 111024 291 0.6- 0.0 111104 C32 0.1- 0.4+ 120109 204 0.2- 0.4- 111024 291 0.4- 0.6+ 111117 204 0.2- 0.3- 120109 204 0.5+ 0.5+ 111024 F65 0.0 0.1+ 111117 204 0.1- 0.0 120125 372 0.6+ 0.3+ 111024 F65 0.1- 0.2+ 111121 215 0.2+ 0.3- 120125 372 0.4+ 0.5+ 111024 F65 0.1- 0.1+ 111121 215 0.0 0.0 120125 372 0.6+ 0.1+ 111024 F65 0.2- 0.1+ 111121 215 0.2+ 0.1+ 120126 215 (2.8+ 0.5+) 111024 F65 0.1- 0.3+ 111123 H06 0.0 1.0- 120126 215 (3.3+ 0.9+) 111024 568 0.0 0.1+ 111123 H06 0.5- 0.4- 2019/ 111024 568 0.0 0.1+ 111124 568 0.0 0.1- 190926 F51 0.1+ 0.2+ 111024 568 0.0 0.0 111124 568 0.1- 0.1- 190926 F51 0.1- 0.1- 111026 926 0.3+ 0.2- 111124 568 0.1- 0.1- 190926 F51 0.2- 0.2+ 111026 926 0.4- 0.2- 111203 J47 0.6- 0.3+ 190926 F51 0.2+ 0.3- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2019 Oct. 25