Nakano Note (Nakano wa Kangaeru noda) NK 4368 P/Scotti (2013 A2 = 2021 Ax)
The following improved orbital elements, by S. Nakano, are from 97 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 +/- 0.47 arc second. Residuals for the recovery observations were +6'.7 for Right Ascension and -1'.9 for Declination from the prediction in NK 3665 (= HICQ 2020) with the delta-T correction = -0.18 day. The comet will pass 0.64 AU from Jupiter on 2032 July 1. Also comet has passed 0.62 AU from Jupiter on 1961 Dec. 17 UT. Epoch = 2021 Mar. 7.0 TT T = 2021 Feb. 15.48995 +/- 0.00500 (m.e.) TT Peri. = 134.52520 +/- 0.00204 Node = 355.81117 +/- 0.00070 (2000.0) Inc. = 3.36129 +/- 0.00004 q = 2.1899446 +/- 0.0000035 AU e = 0.4544015 +/- 0.0000009 a = 4.0138387 +/- 0.0000091 AU n' = 0.12256436 +/- 0.00000042 P = 8.042 +/- 0.0000274 years T = 2013 Feb. 7.27290 TT Epoch = 2013 Jan. 28.0 TT Peri. = 134.49679 e = 0.4558427 Node = 355.84282 (2000.0) a = 4.0013640 AU Inc. = 3.36609 n'= 0.12313797 q = 2.1773715 AU P = 8.004 years The predicted orbit for the 2029 return is as follows: T = 2029 Feb. 24.41159 TT Epoch = 2029 Mar. 5.0 TT Peri. = 134.62793 e = 0.4554168 Node = 355.70961 (2000.0) a = 4.0006418 AU Inc. = 3.36377 n'= 0.12317131 q = 2.1786821 AU P = 8.002 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2013/ 130118 900 1.2+ 0.9- 130210 D90 0.1- 0.6+ 130106 691 1.1- 0.8+ 130119 D90 0.3+ 0.2+ 130210 D90 1.0- 0.5+ 130106 691 0.6- 0.2+ 130119 D90 0.3- 0.1+ 130210 349 0.0 0.4+ 130106 691 1.2- 0.8+ 130119 D90 0.4- 0.3+ 130210 349 0.8- 0.5- 130106 291 0.4+ 0.0 130122 291 0.1+ 0.0 130211 372 1.8- 0.9+ 130106 291 0.4+ 0.0 130122 291 0.1+ 0.0 130211 372 1.5- 0.6+ 130106 291 0.2+ 0.1- 130122 291 0.1+ 0.2+ 130212 F51 0.1+ 0.2- 130107 291 0.6+ 0.2- 130122 G96 0.2- 0.1+ 130212 F51 0.2+ 0.2- 130107 291 0.1+ 0.0 130122 G96 0.5- 0.2- 130212 F51 0.2+ 0.2- 130107 291 0.4- 0.2+ 130122 G96 0.3- 0.1- 130212 F51 0.2+ 0.2- 130107 291 0.2+ 0.0 130122 G96 0.9- 0.1+ 130215 372 (2.4- 1.2+) 130107 291 0.3+ 0.1- 130122 A13 0.0 0.2- 130215 372 (2.6- 0.9+) 130108 291 0.1+ 0.1+ 130122 A13 0.0 0.1- 130216 204 0.3+ 0.3+ 130108 291 0.4+ 0.2- 130131 D95 0.8+ 0.2- 130216 204 0.3+ 0.1- 130108 291 0.2- 0.2- 130131 D95 1.4+ 0.4+ 130216 A13 0.2- 0.5- 130108 F65 0.3+ 0.3- 130131 D95 0.3+ 1.1+ 130216 A13 0.5+ 0.3- 130108 F65 0.5+ 0.2+ 130202 372 0.6- 0.7+ 130305 291 0.0 0.4+ 130110 691 0.5- 0.3+ 130202 372 0.4- 0.2+ 130305 291 0.2- 0.3+ 130110 691 0.9- 0.2- 130202 372 0.6- 0.4+ 130413 291 0.5- 0.5+ 130110 691 1.3- 0.4+ 130203 561 0.8+ 0.7- 130413 291 0.2- 0.6+ 130111 D90 0.4- 0.2- 130203 561 0.5+ 0.3+ 130413 291 0.3- 0.7+ 130111 D90 0.6- 0.1+ 130203 561 1.5+ 0.4- 130502 291 0.7- 0.1+ 130111 D90 0.1+ 0.0 130204 561 0.5+ 0.2- 130502 291 0.5+ 0.2+ 130113 J47 0.1+ 0.7+ 130204 213 0.0 0.3- 130502 291 0.1+ 0.1+ 130113 J47 0.1- 0.2+ 130204 213 0.2+ 0.1- 130601 291 0.1+ 0.5- 130113 J47 0.5- 0.1+ 130204 213 0.2+ 0.5+ 130601 291 0.1- 0.4- 130116 H06 0.0 0.1+ 130204 157 0.1- 0.1- 2021/ 130116 H06 0.0 0.3+ 130204 157 0.6+ 0.1- 210114 Z84 0.0 0.1- 130116 H06 0.1- 0.5+ 130205 291 0.1+ 0.0 210114 Z84 0.1+ 0.2- 130116 C32 0.4+ 0.6- 130205 291 0.1+ 0.0 210114 Z84 0.3- 0.2- 130116 C32 0.7- 0.0 130205 291 0.4+ 0.2+ 210115 Z84 0.1+ 0.3- 130116 C32 0.1- 0.4+ 130206 372 0.9- 0.4+ 210115 Z84 0.1- 0.1- 130116 C32 0.1- 0.2+ 130206 372 0.5- 0.2+ 210115 Z84 0.1- 0.0 130118 900 0.4+ 0.3+ 130210 D90 0.4- 0.2- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 Jan. 15