Nakano Note (Nakano wa Kangaeru noda) NK 4367 P/Tenagra (2013 EW90 = 2021 Ax)

The following improved orbital elements, by S. Nakano, are from 66 observations 2013 to 2021. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.41 arc second. Residuals for the recovery observations were +87" for Right Ascension and +18" for Declination from the prediction in NK 2899 (= HICQ 2018/ 2019/2020) with the delta-T correction = -0.11 day. The comet will pass 0.46 AU from Jupiter on 2033 Dec. 23 UT. Orbit depends upon only one night observations in 2014. See the previous orbit in NK 2899. Epoch = 2021 Mar. 7.0 TT T = 2021 Feb. 15.45168 +/- 0.00415 (m.e.) TT Peri. = 346.31116 +/- 0.00073 Node = 160.29406 +/- 0.00003 (2000.0) Inc. = 31.78999 +/- 0.00006 q = 3.3140520 +/- 0.0000104 AU e = 0.1948680 +/- 0.0000024 a = 4.1161597 +/- 0.0000178 AU n' = 0.11802276 +/- 0.00000076 P = 8.351 +/- 0.0000541 years T = 2012 Oct. 11.65043 TT Epoch = 2012 Sept.30.0 TT Peri. = 345.99712 e = 0.1960483 Node = 160.36250 (2000.0) a = 4.1050615 AU Inc. = 31.81302 n'= 0.11850170 q = 3.3002714 AU P = 8.317 years The predicted orbit for the 2029 return is as follows: T = 2029 June 15.93818 TT Epoch = 2029 July 3.0 TT Peri. = 346.40260 e = 0.1961470 Node = 160.25672 (2000.0) a = 4.1019376 AU Inc. = 31.81829 n'= 0.11863709 q = 3.2973550 AU P = 8.308 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2013/ 130411 D29 0.0 0.7- 130506 204 0.1- 0.6- 130216 691 0.3- 0.6+ 130411 D29 0.1- 0.0 130507 711 0.0 0.3- 130216 691 0.4- 0.1- 130411 D29 0.4+ 0.1- 130507 711 0.1+ 0.5- 130216 691 0.3- 0.4+ 130411 D29 0.3- 0.5- 130507 711 0.1+ 0.4- 130303 926 0.2+ 0.1+ 130413 I41 0.1- 0.2- 130507 711 0.0 0.6- 130303 926 0.4+ 0.1- 130413 I41 0.0 0.0 130507 711 0.1- 0.4- 130303 691 0.3- 0.0 130413 I41 0.2+ 0.3- 130513 372 0.7+ 0.4+ 130303 926 0.3+ 0.1- 130414 I41 0.0 0.0 130513 372 0.2+ 0.4+ 130303 691 0.1+ 0.1+ 130414 I41 0.1- 0.1+ 130513 372 0.3+ 0.2- 130303 691 0.3- 0.7- 130414 I41 0.2+ 0.3+ 130514 215 (3.9- 1.9+) 130314 703 0.8- 0.5+ 130418 I41 0.1+ 0.1- 130514 215 (2.9- 1.1+) 130314 703 0.3+ 0.7- 130418 I41 0.1- 0.0 130514 215 (2.7- 0.4+) 130314 703 0.3+ 0.3+ 130418 I41 0.3+ 0.2- 2014/ 130314 703 0.7- 0.5- 130430 H06 0.1+ 0.3+ 140517 C10 0.6- 0.3- 130314 703 1.2- 0.2- 130430 H06 0.3- 0.1- 140517 C10 0.6+ 0.6+ 130404 703 0.5- 1.3+ 130502 H06 0.3+ 0.6+ 2021/ 130404 703 (2.1- 0.7-) 130502 H06 0.3+ 0.7+ 210113 Z84 0.1+ 0.1- 130404 703 0.8- 0.8+ 130502 H06 0.1- 1.2+ 210113 Z84 0.1+ 0.0 130404 703 0.8- 0.5+ 130503 F65 0.0 0.5- 210113 Z84 0.1+ 0.3+ 130410 G96 0.1+ 0.1+ 130503 F65 0.0 0.2- 210114 Z84 0.2- 0.1- 130410 G96 0.2- 0.3- 130503 F65 0.4+ 0.1- 210114 Z84 0.0 0.0 130410 G96 0.0 0.1- 130504 204 0.4+ 0.2+ 210114 Z84 0.1+ 0.1+ 130410 G96 0.3+ 0.3- 130504 204 0.8+ 0.0 210114 Z84 0.1- 0.1- 130411 D29 0.2+ 0.1- 130506 204 0.3- 0.0 130411 D29 1.3+ 0.4- 130506 204 0.6+ 0.5+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 Jan. 15

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