Nakano Note (Nakano wa Kangaeru noda) NK 4988 P/NEOWISE (2018 HT3)
The following improved orbital elements, by S. Nakano, are from 65 observations 2012 to 2023. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.59 arc second. The comet has passed 0.97 AU from Jupiter on 1973 May 29 UT. See an orbit in CBET 5252 (same orbit). Epoch = 2023 Apr. 6.0 TT T = 2023 Mar. 29.61990 +/- 0.00001 (m.e.) TT Peri. = 216.36728 +/- 0.00006 Node = 283.21155 +/- 0.00005 (2000.0) Inc. = 29.27753 +/- 0.00003 q = 0.5189595 +/- 0.0000002 AU e = 0.8255671 +/- 0.0000001 a = 2.9751235 +/- 0.0000018 AU n' = 0.19206427 +/- 0.00000017 P = 5.132 +/- 0.0000047 years T = 2012 Dec. 13.08878 TT Epoch = 2012 Dec. 19.0 TT Peri. = 215.64663 e = 0.8221860 Node = 284.12932 (2000.0) a = 2.9822050 AU Inc. = 29.62731 n'= 0.19138057 q = 0.5302778 AU P = 5.150 years T = 2018 Feb. 7.98122 TT Epoch = 2018 Feb. 11.0 TT Peri. = 215.73507 e = 0.8221450 Node = 284.04233 (2000.0) a = 2.9833274 AU Inc. = 29.58756 n'= 0.19127257 q = 0.5305996 AU P = 5.153 years The predicted orbit for the 2028 return is as follows: T = 2028 May 15.42941 TT Epoch = 2028 May 29.0 TT Peri. = 216.41461 e = 0.8260955 Node = 283.16696 (2000.0) a = 2.9723155 AU Inc. = 29.27895 n'= 0.19233650 q = 0.5168991 AU P = 5.124 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2012/ 180516 807 0.2- 0.3+ 230420 X07 0.4- 1.0+ 120906 F51 0.1- 0.1+ 180516 807 0.0 0.4+ 230420 X07 0.3- 0.3+ 120906 F51 0.0 0.1- 180607 807 0.4+ 0.0 230420 X07 0.1- 1.4+ 121006 F51 0.1- 0.0 180607 807 0.5+ 0.3- 230420 L81 0.2+ 1.0+ 121006 F51 0.2+ 0.2+ 180607 474 0.4+ 0.2+ 230420 L81 0.5- 1.4+ 121106 I41 0.5+ 0.3+ 180607 474 0.4+ 0.4+ 230420 I47 0.4- 1.3+ 121106 I41 0.8+ 0.4+ 180607 474 0.5+ 0.3+ 230420 I47 0.4- 0.5+ 2013/ 180607 474 0.6+ 0.2+ 230422 W88 0.6+ 0.0 130618 F51 0.1+ 0.3- 180608 807 0.7+ 0.2+ 230422 W88 0.4+ 0.2+ 130618 F51 0.0 0.6- 180608 807 0.6+ 0.1+ 230423 W88 0.2+ 0.6- 2018/ 180608 807 0.6+ 0.2+ 230423 W88 0.2+ 0.6- 180422 C51 0.5- 0.1+ 2022/ 230424 I47 0.2+ 0.3+ 180423 C51 0.5- 0.0 221130 291 0.0 0.4+ 230424 W88 0.1+ 0.3- 180423 C51 0.6- 1.0+ 221130 291 0.4- 0.1+ 230424 I47 0.6- 1.3+ 180423 C51 0.8+ 1.0+ 221130 291 0.5+ 0.6+ 230424 W88 0.5- 0.2- 180423 C51 1.7- 0.4+ 2023/ 230425 M21 0.5+ 0.7- 180423 C51 0.5- 0.6+ 230418 247 0.3+ 0.2+ 230425 M21 0.7- 0.4+ 180423 C51 0.4- 0.3+ 230418 247 (0.3- 2.1+) 230425 M21 0.7+ 0.4- 180423 C51 0.0 0.8- 230418 247 0.8+ 1.0+ 230425 M21 0.8- 0.4+ 180423 C51 (1.4- 2.0+) 230418 247 0.2+ 0.3+ 230427 Q62 0.2+ 0.4+ 180512 807 0.3- 0.3+ 230418 247 1.0- 1.8- 230427 Q62 0.1+ 0.5- 180512 807 0.5- 0.4+ 230418 247 (1.6- 2.2+) 230430 I47 0.1+ 0.3+ 180512 807 0.7- 0.6+ 230419 I47 0.0 1.0+ 230430 I47 0.6- 0.1- 180515 T12 0.1- 0.6+ 230419 I47 0.4- 1.9+ 180516 807 0.3- 0.4+ 230419 I47 0.4- 0.9+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2023 May 3