Nakano Note (Nakano wa Kangaeru noda) NK 4315 P/WISE (2010 B2 = 2020 Yx)

The following improved orbital elements, by S. Nakano, are from 55 observations 2010 to 2020. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.48 arc second. Ye's recovery has confirmed single observation on one night 2015 June 3 at W84 belongs with this comet. Namely the comet has made three appearances after discovery. Residuals for recovery observations were -4'.1 for Right Ascension and +2'.8 for Declination from the prediction in NK 4187 with delta-T correction = +0.19 day. Also the prediction in NK 3440 (= HICQ 2020) was delta-T = +0.48 day. The comet has passed 0.075 AU from Mars on 1999 Feb. 17 and 0.44 AU from Jupiter on 1962 Nov. 12 UT. Also comet will pass 0.51 AU from Jupiter on 2045 Sept. 12 UT. See the previous orbits in NK 2305, NK 3440 and NK 4187. Epoch = 2020 Dec. 17.0 TT T = 2020 Dec. 5.37945 +/- 0.00032 (m.e.) TT Peri. = 155.92043 +/- 0.00020 Node = 0.84896 +/- 0.00009 (2000.0) Inc. = 8.93102 +/- 0.00004 q = 1.6175453 +/- 0.0000027 AU e = 0.4799422 +/- 0.0000009 a = 3.1103180 +/- 0.0000074 AU n' = 0.17967882 +/- 0.00000064 P = 5.485 +/- 0.0000197 years T = 2009 Dec. 21.91398 TT Epoch = 2010 Jan. 4.0 TT Peri. = 156.04798 e = 0.4803261 Node = 0.87410 (2000.0) a = 3.1105628 AU Inc. = 8.93166 n'= 0.17965761 q = 1.6164784 AU P = 5.486 years T = 2015 June 13.85716 TT Epoch = 2015 June 27.0 TT Peri. = 155.95217 e = 0.4812372 Node = 0.85344 (2000.0) a = 3.1073890 AU Inc. = 8.93874 n'= 0.17993292 q = 1.6119978 AU P = 5.478 years The predicted orbit for the 2026 return is as follows: T = 2026 May 30.54002 TT Epoch = 2026 June 9.0 TT Peri. = 155.81918 e = 0.4790367 Node = 0.81726 (2000.0) a = 3.1128227 AU Inc. = 8.92874 n'= 0.17946200 q = 1.6216663 AU P = 5.492 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2010/ 100208 291 0.6- 0.3+ 100319 A79 1.2- 0.8+ 100122 C51 0.9- 0.3- 100208 291 0.4- 0.1+ 100319 A79 0.9- 1.0- 100122 C51 0.5- 0.8- 100208 291 0.4+ 0.3- 100321 I33 0.8+ 0.1- 100122 C51 1.0- 0.6- 100208 568 0.2+ 0.1- 100321 I33 0.8+ 0.1- 100123 C51 1.1- 0.2- 100208 568 0.2+ 0.1- 100321 I33 1.0+ 0.3- 100123 C51 1.0- 0.6+ 100208 568 0.2+ 0.0 100321 I33 0.6+ 0.4- 100123 C51 0.0 0.3+ 100212 H06 0.9- 0.4- 100407 E85 0.7- 0.1+ 100123 C51 0.8- 0.1+ 100212 H06 0.3- 0.2- 100407 E85 0.6- 0.3- 100123 C51 0.9- 0.5+ 100212 H06 0.6+ 0.3+ 100407 E85 0.4- 0.4- 100123 C51 0.3- 0.4+ 100213 204 0.2- 0.6+ 100407 E85 0.3+ 0.4- 100123 C51 1.0- 0.6+ 100213 204 0.4- 0.1- 100506 F51 0.8- 0.4+ 100123 C51 0.0 0.6+ 100220 E85 (2.7- 0.9-) 100513 F51 0.8- 0.7+ 100124 C51 0.1+ 0.1+ 100220 E85 0.5- 0.2+ 2015/ 100124 C51 0.3- 1.2+ 100220 568 0.2+ 0.1- 150603 W84 0.9+ 1.0- 100207 H21 0.9+ 0.5- 100220 568 0.2+ 0.1- 2020/ 100207 H21 0.5+ 0.2+ 100313 D90 0.3- 0.0 201219 G37 0.8- 0.2+ 100207 H21 0.3+ 0.9+ 100313 D90 0.2- 0.6+ 201219 G37 0.5+ 0.2- 100207 568 0.0 0.0 100313 D90 0.1- 0.6+ 201220 G37 0.8+ 0.6- 100207 568 0.0 0.0 100317 H06 0.7+ 0.1+ 201220 G37 1.2- 0.7+ 100207 568 0.0 0.0 100317 H06 0.0 0.4+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2020 Dec. 21

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