Nakano Note (Nakano wa Kangaeru noda) NK 4187 P/2010 B2 (WISE)

The following improved orbital elements, by S. Nakano, are from 50 observations 2010 Jan. 22 to May 13. 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 comet has been missed on 2015 return. There is a single observation on 2015 June 3 (MPEC 2020-Q175) which shows delta-T correction = +0.09 day from this orbit. If observation is correct, predicted T (which is given 2020 Dec. 4.90 TT in NK 3440) will be 2020 Dec. 5.19 TT. See the previous orbit in NK 2305 (= NK 3440, HICQ 2020). Epoch = 2010 Jan. 4.0 TT T = 2009 Dec. 21.91257 +/- 0.00033 (m.e.) TT Peri. = 156.04639 +/- 0.00026 Node = 0.87332 +/- 0.00014 (2000.0) Inc. = 8.93141 +/- 0.00006 q = 1.6164416 +/- 0.0000054 AU e = 0.4803216 +/- 0.0000139 a = 3.1104651 +/- 0.0000837 AU n' = 0.17966607 +/- 0.00000726 P = 5.486 +/- 0.0002215 years (+/- 0.08 day) The predicted orbit for the 2020 return is as follows: T = 2020 Dec. 5.19096 TT Epoch = 2020 Dec. 17.0 TT Peri. = 155.91886 e = 0.4799375 Node = 0.84817 (2000.0) a = 3.1102197 AU Inc. = 8.93078 n'= 0.17968734 q = 1.6175087 AU P = 5.485 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2010/ 100207 568 0.0 0.0 100313 D90 0.4- 0.7+ 100122 C51 0.5- 0.6- 100207 568 0.0 0.0 100313 D90 0.3- 0.7+ 100122 C51 0.1- 1.1- 100208 291 0.7- 0.3+ 100317 H06 0.6+ 0.3+ 100122 C51 0.6- 0.8- 100208 291 0.5- 0.1+ 100317 H06 0.2- 0.6+ 100123 C51 0.7- 0.5- 100208 291 0.3+ 0.3- 100319 A79 1.4- 0.9+ 100123 C51 0.7- 0.3+ 100208 568 0.2+ 0.1- 100319 A79 1.0- 0.9- 100123 C51 0.3+ 0.1+ 100208 568 0.2+ 0.1- 100321 I33 0.7+ 0.0 100123 C51 0.4- 0.2- 100208 568 0.2+ 0.0 100321 I33 0.6+ 0.0 100123 C51 0.6- 0.2+ 100212 H06 1.0- 0.4- 100321 I33 0.9+ 0.2- 100123 C51 0.1+ 0.2+ 100212 H06 0.4- 0.2- 100321 I33 0.5+ 0.3- 100123 C51 0.7- 0.4+ 100212 H06 0.5+ 0.4+ 100407 E85 0.5- 0.1+ 100123 C51 0.4+ 0.4+ 100213 204 0.3- 0.6+ 100407 E85 0.4- 0.3- 100124 C51 0.4+ 0.1- 100213 204 0.5- 0.1- 100407 E85 0.2- 0.4- 100124 C51 0.0 1.0+ 100220 E85 (2.9- 0.8-) 100407 E85 0.6+ 0.4- 100207 H21 0.9+ 0.5- 100220 E85 0.7- 0.3+ 100506 F51 0.1+ 0.2- 100207 H21 0.5+ 0.2+ 100220 568 0.0 0.0 100513 F51 0.1+ 0.0 100207 H21 0.3+ 0.9+ 100220 568 0.0 0.0 100207 568 0.0 0.0 100313 D90 0.5- 0.1+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2020 Sept. 3

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