Nakano Note (Nakano wa Kangaeru noda) NK 4251 P/Christensen (2007 B1 = 2020 Wx)
The following improved orbital elements, by S. Nakano, are from 124 observations 2007 to 2020. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.58 arc second. Residuals for recovery observations were +20'.5 for Right Ascension and -1'.9 for Declination from the prediction in NK 3663 (= HICQ 2020) with the delta-T correction = -0.89 day. The comet has passed 0.84 AU from Jupiter on 1995 Jan. 9 UT. See the previous orbit in YC 2544 and NK 3663. Epoch = 2021 Jan. 26.0 TT T = 2021 Jan. 24.48955 +/- 0.00943 (m.e.) TT Peri. = 46.69190 +/- 0.00335 Node = 77.67339 +/- 0.00040 (2000.0) Inc. = 12.37718 +/- 0.00010 q = 2.4387246 +/- 0.0000109 AU e = 0.5808951 +/- 0.0000018 a = 5.8188879 +/- 0.0000365 AU n' = 0.07021729 +/- 0.00000066 P = 14.037 +/- 0.0001321 years (+/- 0.05 day) T = 2007 Jan. 19.80273 TT Epoch = 2007 Jan. 20.0 TT Peri. = 46.84823 e = 0.5809643 Node = 77.79344 (2000.0) a = 5.8292367 AU Inc. = 12.37629 n'= 0.07003039 q = 2.4426583 AU P = 14.074 years The predicted orbit for the 2035 return is as follows: T = 2035 Feb. 7.29099 TT Epoch = 2035 Feb. 2.0 TT Peri. = 46.70872 e = 0.5808548 Node = 77.51189 (2000.0) a = 5.8328464 AU Inc. = 12.36745 n'= 0.06996539 q = 2.4448096 AU P = 14.087 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2007/ 070121 300 0.3+ 0.8+ 070212 349 0.8+ 1.2- 070117 703 1.1- 0.6- 070121 300 0.2+ 0.4+ 070212 349 0.6+ 1.1- 070117 703 1.2- 0.2+ 070122 349 0.6- 0.3+ 070216 673 0.3+ 0.4+ 070117 703 1.7- 0.4+ 070122 349 0.7- 0.1- 070216 673 0.3+ 0.2+ 070117 703 0.4- 0.2+ 070125 703 0.9- 0.6- 070216 673 0.2+ 0.6+ 070117 703 0.7- 0.1+ 070125 703 1.0- 0.6+ 070216 673 0.6+ 0.6+ 070117 703 0.2- 0.1+ 070125 703 0.1- 0.8- 070216 104 (0.3+ 4.2+) 070117 703 0.1- 0.2+ 070125 703 0.6- 0.4- 070216 104 0.3- 0.4+ 070117 703 0.6- 1.0+ 070125 372 1.3- 0.4- 070216 104 0.2- 1.5- 070117 703 1.2- 0.1- 070125 A32 0.1+ 0.7- 070217 J70 0.3- 0.2+ 070117 703 1.6- 0.7+ 070125 A32 0.3- 0.8- 070217 J70 0.6+ 0.0 070118 118 0.4- 0.2+ 070126 213 0.1- 0.5- 070217 J70 0.7- 0.0 070118 118 1.0+ 1.1+ 070126 213 0.1- 0.4- 070217 J70 (2.1- 0.5-) 070118 118 0.5+ 0.5+ 070126 213 0.0 0.4- 070219 213 0.2+ 0.5+ 070118 118 0.3- 0.1- 070127 213 1.1+ 0.2+ 070219 213 0.1+ 0.6+ 070119 734 0.1+ 0.1- 070127 213 1.1+ 0.0 070219 213 0.1+ 0.5+ 070119 734 0.2+ 0.9- 070127 213 1.0+ 0.2+ 070221 372 0.4- 0.0 070119 734 0.3+ 0.6- 070128 232 1.3+ 0.2+ 070222 170 1.1+ 0.2- 070119 470 0.6+ 0.1+ 070128 232 0.3+ 0.4+ 070222 170 0.8+ 0.2- 070119 204 0.0 0.1- 070128 147 0.6- 0.3+ 070222 170 0.8+ 0.3+ 070120 176 0.2- 0.1+ 070128 232 0.5- 0.1+ 070225 213 0.3+ 0.2- 070120 176 0.1- 0.1+ 070128 147 1.2- 1.0+ 070225 213 0.3+ 0.4- 070120 176 0.2- 0.0 070128 204 0.5- 0.1+ 070225 213 0.3+ 0.5- 070120 176 0.2- 0.1- 070128 204 0.2+ 0.2- 070303 213 0.3- 0.4+ 070120 204 0.1- 0.1- 070204 J95 0.5+ 0.8- 070303 213 0.1- 0.4+ 070120 473 0.2- 0.2+ 070204 J95 0.1+ 0.6- 070303 213 0.3- 0.5+ 070120 473 0.1+ 0.0 070205 104 (2.6+ 0.6-) 070319 213 0.3+ 0.2+ 070120 473 0.1- 0.1- 070205 104 0.4+ 0.1- 070319 213 0.1+ 0.0 070120 473 0.4+ 0.4+ 070205 104 1.3- 0.4- 070322 300 0.3+ 0.4- 070120 473 0.1- 0.0 070205 104 0.7- 0.2+ 070322 300 0.1+ 0.3+ 070120 H55 0.1+ 0.1+ 070206 699 0.1- 0.2- 070322 300 0.5- 0.3+ 070120 H55 0.0 0.2+ 070206 699 0.6- 1.6+ 070322 300 0.6- 0.3+ 070120 H55 0.0 0.2+ 070206 699 1.5+ 0.0 070323 J70 (2.9+ 0.3-) 070120 673 0.5+ 0.3+ 070206 699 1.9+ 0.0 070323 J70 (4.0- 2.5+) 070120 673 0.5+ 0.0 070208 673 0.7+ 0.0 070323 J70 0.8- 0.4- 070120 673 0.4+ 0.4+ 070208 673 0.7+ 0.1+ 070323 J70 1.8- 0.7- 070120 673 0.5+ 0.3+ 070208 673 0.7+ 0.3+ 070323 J70 (4.8- 0.7+) 070120 673 0.6+ 0.2+ 070208 673 0.4+ 0.0 2020/ 070120 673 0.4+ 0.5+ 070209 703 0.4+ 0.5- 201117 Z84 0.0 0.2+ 070120 673 0.3+ 0.7+ 070209 703 1.3- 0.8- 201117 Z84 0.3+ 0.5- 070120 J70 (2.2- 3.0-) 070209 215 0.8+ 0.0 201117 Z84 0.1+ 0.2+ 070121 232 0.5- 1.2- 070209 215 1.5+ 0.3- 201118 Z84 0.3- 0.1- 070121 232 (0.0 2.1-) 070209 213 0.2+ 0.0 201118 Z84 0.2+ 0.1- 070121 232 0.5- 1.4- 070209 213 0.2+ 0.1- 201118 Z84 0.4- 0.3- 070121 300 0.1+ 0.0 070209 213 0.3+ 0.1- ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2020 Nov. 19