Nakano Note (Nakano wa Kangaeru noda) NK 4156 P/Bressi (2011 U2)

Recovery observations in 2020 were found on MPEC M114 and P019 (2020) and the following improved orbital elements, by S. Nakano, are from 180 observations 2011 to 2020. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.46 arc second. The residuals of recovery observations on 2020 June/July were -5" for Right Ascension and -2" for Declination from the prediction in NK 3378 (= HICQ 2018/2019/2020) with the delta-T correction = +0.016 day. The comet has passed 0.97 AU from Jupiter on 2020 Feb. 5 UT. See the previous orbits in NK 2206, NK 2254, NK 2387, NK 2611, NK 2894 and NK 3378. Epoch = 2023 Oct. 23.0 TT T = 2023 Nov. 4.13301 +/- 0.00371 (m.e.) TT Peri. = 169.36813 +/- 0.00028 Node = 260.04100 +/- 0.00007 (2000.0) Inc. = 9.79308 +/- 0.00001 q = 4.1325775 +/- 0.0000026 AU e = 0.1275293 +/- 0.0000003 a = 4.7366373 +/- 0.0000034 AU n' = 0.09560902 +/- 0.00000010 P = 10.309 +/- 0.0000110 years T = 2012 May 7.85725 TT Epoch = 2012 Apr. 23.0 TT Peri. = 157.76736 e = 0.1109095 Node = 266.69288 (2000.0) a = 5.4407691 AU Inc. = 9.63005 n'= 0.07766290 q = 4.8373359 AU P = 12.691 years The predicted orbit for the 2034 return is as follows: T = 2034 Jan. 9.14566 TT Epoch = 2033 Dec. 29.0 TT Peri. = 168.08834 e = 0.1255940 Node = 260.02237 (2000.0) a = 4.7124624 AU Inc. = 9.80746 n'= 0.09634567 q = 4.1206056 AU P = 10.230 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2011/ 111115 703 1.8- 0.3- 131227 G96 1.1- 0.7+ 111024 691 0.8- 0.0 111115 F51 0.5+ 0.1+ 131227 G96 0.6- 0.4+ 111024 691 (2.0- 0.2-) 111115 703 1.3- 0.4- 2014/ 111024 691 1.0- 0.1+ 111117 291 0.5+ 0.7+ 140104 J43 0.5- 0.3+ 111024 291 0.0 0.3+ 111117 291 0.4+ 0.2+ 140104 J43 0.5- 0.4+ 111024 291 0.2+ 0.2+ 111117 291 0.2+ 0.4+ 140104 J43 0.4- 0.0 111024 291 0.1+ 0.5+ 111117 704 0.6- 0.5+ 140104 J43 0.2- 0.2+ 111024 B18 0.6+ 0.4+ 111117 704 0.1- 0.0 140110 G96 0.0 0.2- 111024 B18 0.1+ 0.7+ 111117 704 1.9- 1.0+ 140110 G96 0.4- 0.3+ 111024 B18 0.0 0.3+ 111118 157 0.0 0.1+ 140110 G96 1.0- 0.1+ 111025 291 0.1+ 0.3+ 111118 157 0.4+ 0.1- 140110 G96 1.1- 0.3+ 111025 291 0.3+ 0.4+ 111118 C32 0.0 0.5+ 140126 Q62 0.1- 0.1+ 111025 291 0.2+ 0.3+ 111118 C32 0.0 0.6+ 140126 Q62 0.3- 0.0 111025 F65 0.6+ 0.3+ 111118 C32 0.2- 0.3+ 140126 Q62 0.4- 0.0 111025 F65 0.8+ 0.7+ 111118 C32 0.2- 0.3+ 140320 215 0.7+ 0.1- 111025 D90 0.7- 0.3- 111121 215 0.1+ 0.2- 140320 215 1.4- 1.8+ 111025 D90 1.0- 0.4- 111121 215 0.2- 0.2- 141125 F51 0.1- 0.1+ 111025 D90 0.3- 0.2+ 111121 215 0.3- 0.4- 141125 F51 0.0 0.1- 111025 B18 1.0- 0.1- 111121 130 0.9- 0.2- 141125 F51 0.1- 0.0 111025 B18 0.8- 0.3- 111121 130 0.1- 0.3- 2015/ 111025 B18 0.3- 0.0 111121 130 0.3- 0.1+ 150126 F51 0.2+ 0.0 111026 291 0.1+ 0.3+ 111122 372 0.3+ 0.6+ 150126 F51 0.1+ 0.0 111026 291 0.4+ 0.2+ 111122 372 0.5- 0.4- 150126 F51 0.0 0.2+ 111026 291 0.5+ 0.5+ 111122 372 0.5- 0.5- 150126 F51 0.1- 0.2+ 111026 H06 0.0 0.1+ 111122 372 0.1+ 0.6+ 150218 W84 0.3+ 0.2+ 111026 H06 0.2+ 0.0 111123 703 0.4- 0.6+ 150218 W84 0.4+ 0.1- 111026 H06 0.3+ 0.1- 111123 703 (2.1- 0.9+) 150218 W84 0.2- 0.1+ 111027 B82 0.5+ 0.7+ 111123 703 1.6- 0.6+ 150218 W84 0.0 0.1- 111027 B82 0.0 0.0 111123 703 (0.5- 2.3+) 150320 F51 0.2+ 0.3+ 111027 B82 0.1- 0.6+ 111124 H06 0.2- 0.1- 150320 F51 0.0 0.2+ 111027 C32 0.4- 0.3- 111124 H06 0.1- 0.2- 150320 F51 0.2+ 0.3+ 111027 C32 0.3+ 0.2- 111124 H06 0.1+ 0.2- 150320 F51 0.1+ 0.1+ 111027 C32 0.1+ 0.1- 111126 349 0.0 0.5- 2016/ 111027 C32 0.2+ 0.1- 111126 349 0.5+ 1.0- 160328 W84 0.5+ 0.1+ 111028 J01 0.3+ 0.3- 111224 349 0.4+ 0.1- 160328 W84 0.5+ 0.1+ 111028 J01 0.1- 0.2- 111224 349 0.9+ 0.6+ 160328 W84 0.3+ 0.2+ 111028 J01 0.3- 0.3- 111229 J01 0.1+ 0.4- 160330 W84 0.1+ 0.3+ 111029 204 0.1+ 0.0 111229 J01 0.6- 0.0 160330 W84 0.4+ 0.1+ 111029 204 0.3+ 0.0 111229 J01 0.0 0.4+ 160330 W84 0.3+ 0.2+ 111029 H06 0.2- 0.1+ 2012/ 160330 W84 0.2+ 0.2+ 111029 H06 0.1+ 0.3+ 120116 204 0.1- 0.0 160330 W84 0.2+ 0.1+ 111029 H06 0.2+ 0.3+ 120116 204 0.2- 0.1+ 160331 W84 0.2+ 0.3+ 111029 157 0.4- 0.1+ 120316 G96 1.4- 0.5+ 160331 W84 0.4+ 0.3+ 111029 157 0.4- 0.2- 120316 G96 1.0- 0.0 160331 W84 0.3+ 0.1+ 111030 D29 1.5+ 0.3- 120316 G96 0.3+ 0.1+ 160331 W84 0.3+ 0.2+ 111030 D29 0.7+ 0.6- 120316 G96 0.4- 0.4+ 160331 W84 0.2+ 0.3+ 111030 D29 0.6- 1.0- 2013/ 160401 W84 0.4+ 0.1+ 111031 H06 0.1- 0.4+ 130104 G96 0.2+ 0.1- 160401 W84 0.5+ 0.2+ 111031 H06 0.3- 0.3+ 130104 G96 0.6- 0.2+ 160401 W84 0.4+ 0.0 111031 H06 0.7- 0.2+ 130104 G96 0.4- 0.0 160401 W84 0.3+ 0.2+ 111031 D29 0.0 0.2+ 130104 G96 1.4- 0.8- 2020/ 111031 D29 0.5- 0.4+ 130104 G96 0.7- 0.9- 200617 F51 0.4- 0.0 111031 D29 0.2- 0.1- 130119 G96 0.2- 0.6+ 200617 F51 0.2- 0.2+ 111101 H06 0.5- 0.5+ 130119 G96 0.2+ 0.2+ 200617 F51 0.1- 0.1+ 111101 H06 0.7- 0.3+ 130119 G96 0.5- 0.4+ 200617 F51 0.1+ 0.1+ 111101 H06 0.5- 0.5+ 130119 G96 0.0 0.1- 200717 F51 0.1- 0.1+ 111102 H06 0.2- 0.3+ 130409 F51 0.6+ 0.0 200717 F51 0.1- 0.0 111102 H06 0.3- 0.2+ 130409 F51 0.4+ 0.0 200717 F51 0.0 0.2+ 111104 291 0.0 0.4+ 130409 F51 0.7+ 0.2+ 200720 F51 0.4+ 0.3+ 111104 291 0.3- 0.6+ 131224 291 0.2- 0.2+ 200720 F51 0.1- 0.2+ 111104 291 0.2- 0.0 131224 291 0.4+ 0.0 200720 F51 0.1- 0.3+ 111115 F51 0.5+ 0.1+ 131224 291 0.4+ 0.1+ 200720 F51 0.1- 0.1+ 111115 703 0.1+ 0.2- 131227 G96 1.3- 0.8+ 111115 703 0.6- 0.9- 131227 G96 0.9- 0.4+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2020 Aug. 6

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