Nakano Note (Nakano wa Kangaeru noda) NK 4995 72P/Denning-Fujikawa
The following improved orbital elements, by S. Nakano, are from 59 observations 1978 to 2023, including planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of style II. The mean residual is +/- 1.23 arc seconds. 2023 May observations show the residuals of +192" for Right Ascension and +133" for Declination from the prediction in NK 4262 with the delta-T correction = -0.07 day. The comet has passed 0.55 AU from Jupiter on 2016 Mar. 7 UT. See the previous orbits in NK 343, NK 344, NK 358, NK 487, NK 730, NK 2727 and NK 4262. Epoch = 2023 June 25.0 TT T = 2023 June 15.77464 +/- 0.00033 (m.e.) TT Peri. = 346.73380 +/- 0.00042 Node = 26.70176 +/- 0.00053 (2000.0) Inc. = 10.94859 +/- 0.00007 q = 0.7810188 +/- 0.0000049 AU e = 0.8186917 +/- 0.0000029 a = 4.3076841 +/- 0.0000736 AU n' = 0.11023977 +/- 0.00000283 P = 8.941 +/- 0.0002293 years A1 = -0.121 +/- 0.046 A2 = +0.02002 +/- 0.00071 (+/- 0.08 day) T = 1978 Oct. 2.13955 TT Epoch = 1978 Oct. 19.0 TT Peri. = 334.30911 e = 0.8198727 Node = 41.53776 (2000.0) a = 4.3285778 AU Inc. = 8.64380 n'= 0.10944256 q = 0.7796952 AU P = 9.006 years [ T = 1987 Aug. 2.26516 TT Epoch = 1987 July 24.0 TT Peri. = 338.45353 e = 0.8215464 Node = 36.50205 (2000.0) a = 4.2778730 AU Inc. = 9.39526 n'= 0.11139411 q = 0.7634017 AU P = 8.848 years ] [ T = 1996 May 30.00710 TT Epoch = 1996 June 6.0 TT Peri. = 337.57677 e = 0.8178122 Node = 36.38944 (2000.0) a = 4.3369695 AU Inc. = 9.12802 n'= 0.10912507 q = 0.7901427 AU P = 9.032 years ] [ T = 2005 June 20.21220 TT Epoch = 2005 July 9.0 TT Peri. = 337.59179 e = 0.8169054 Node = 36.36819 (2000.0) a = 4.3510350 AU Inc. = 9.10916 n'= 0.10859635 q = 0.7966511 AU P = 9.076 years ] T = 2014 July 11.62957 TT Epoch = 2014 July 2.0 TT Peri. = 337.84165 e = 0.8190843 Node = 36.11621 (2000.0) a = 4.3343123 AU Inc. = 9.16958 n'= 0.10922543 q = 0.7841452 AU P = 9.024 years The predicted orbit for the 2032 return is as follows: T = 2032 May 14.49115 TT Epoch = 2032 May 8.0 TT Peri. = 346.27158 e = 0.8167177 Node = 26.57011 (2000.0) a = 4.3400311 AU Inc. = 10.78086 n'= 0.10900962 q = 0.7954510 AU P = 9.041 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1978/ 781102 372 1.2- 0.1+ 140701 372 0.2+ 0.2+ 781010 688 0.2+ 3.0- 781102 372 3.3- 0.7- 140701 Q62 0.1- 0.2- 781011 372 1.3- 0.3+ 781103 801 0.4+ 1.4+ 140701 Q62 1.1- 0.2- 781011 372 2.2- 2.0+ 781104 801 0.8+ 0.7+ 140708 Q62 0.8+ 0.2+ 781011 372 0.5- 1.8+ 781108 372(16.3- 18.6+) 140708 Q62 0.1+ 0.4+ 781011 885 (3.8+ 5.1+)Y 781109 372 1.6- 3.2+ Y 140708 Q62 0.3+ 1.0+ 781011 323(13.6+ 7.7-) 781126 801 1.5+ 3.1- 140711 D95 1.8- 0.8+ 781012 063 1.0- 0.1+ 781203 801 1.0- 1.8- 140711 D95 0.7- 2.1+ 781012 323 1.6- 2.3- 781229 801 1.2+ 0.1- 140715 349 1.4- 2.1+ 781013 688 0.6+ 2.8- 2014/ 140715 349 0.3- 0.9+ 781013 323(13.1- 16.8-) 140617 Q62 0.5- 0.1- 140725 372 2.1+ 0.8+ 781014 020 3.8+ 2.1+ 140617 Q62 0.5- 0.1- 140725 372 2.0+ 0.6+ 781014 020 1.9+ 2.8- 140617 Q62 0.5+ 1.2- 140802 349 0.9+ 0.7- 781016 372 (3.9- 4.8-) 140618 Q62 0.6- 0.5- 140802 349 0.0 0.2+ 781028 801 1.0+ 0.7+ 140618 Q62 0.6- 0.8- 2023/ 781029 372 0.2- 0.3+ 140620 Q62 0.3+ 0.5- 230423 X07 0.6+ 0.6- 781029 372 1.0+ 3.2+ 140620 Q62 0.4+ 0.1+ 230423 X07 0.1+ 0.1- 781029 372 1.3- 1.4- 140620 Q62 0.8+ 0.5+ 230426 Q62 0.2- 1.4- 781029 372 0.1+ 0.4- 140625 Q62 0.1- 0.0 230426 Q62 0.9- 0.9+ 781031 372 (2.5- 4.5+)Y 140625 Q62 0.3- 0.2- 230510 X07 0.6+ 0.4+ 781031 372 0.3- 0.6+ 140625 Q62 0.2- 0.4- 230510 X07 0.1- 0.4+ 781101 801 0.2+ 1.0- 140625 Q62 0.4- 0.2- 230510 X07 0.0 0.1+ 781102 801 0.0 1.8+ 140701 372 0.3+ 0.2+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2023 May 14