Nakano Note (Nakano wa Kangaeru noda) NK 3938 80P/Peters-Hartley
The following improved orbital elements, by S. Nakano, are from 47 observations 1982 to 2014, 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 +/- 1.09 arc seconds. The comet will pass 0.77 AU from Jupiter on 2037 Feb. 8 UT. See the previous orbits in NK 419, NK 550 (= MPC 25183), NK 940 (= MPC 48383) and NK 2075. Epoch = 2014 Oct. 30.0 TT T = 2014 Nov. 10.03527 +/- 0.00282 (m.e.) TT Peri. = 339.13043 +/- 0.00092 Node = 259.88915 +/- 0.00012 (2000.0) Inc. = 29.92293 +/- 0.00006 q = 1.6127162 +/- 0.0000044 AU e = 0.5990089 +/- 0.0000018 a = 4.0218259 +/- 0.0000210 AU n' = 0.12219943 +/- 0.00000096 P = 8.066 +/- 0.0000631 years A1 = +0.829 +/- 0.092 A2 = -0.07811 +/- 0.00026 T = 1982 May 8.57119 TT Epoch = 1982 Apr. 21.0 TT Peri. = 338.18703 e = 0.5983784 Node = 260.05995 (2000.0) a = 4.0400785 AU Inc. = 29.85417 n'= 0.12137224 q = 1.6225827 AU P = 8.121 years T = 1990 June 23.63414 TT Epoch = 1990 July 8.0 TT Peri. = 338.30021 e = 0.5979186 Node = 260.10416 (2000.0) a = 4.0433291 AU Inc. = 29.83364 n'= 0.12122590 q = 1.6257473 AU P = 8.130 years T = 1998 Aug. 11.63281 TT Epoch = 1998 Aug. 15.0 TT Peri. = 338.40204 e = 0.5980069 Node = 260.00658 (2000.0) a = 4.0396908 AU Inc. = 29.85495 n'= 0.12138971 q = 1.6239279 AU P = 8.119 years [ T = 2006 Sept.25.80956 TT Epoch = 2006 Sept.22.0 TT Peri. = 338.60742 e = 0.5961535 Node = 259.88167 (2000.0) a = 4.0451985 AU Inc. = 29.89604 n'= 0.12114188 q = 1.6336393 AU P = 8.136 years ] The predicted orbit for the 2022 return is as follows: T = 2022 Dec. 8.86347 TT Epoch = 2022 Dec. 7.0 TT Peri. = 339.24643 e = 0.5985559 Node = 259.79603 (2000.0) a = 4.0237629 AU Inc. = 29.92307 n'= 0.12211120 q = 1.6153157 AU P = 8.071 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1982/ 820723 474 1.5- 1.0+ 1998/ 820711 413 0.5- 1.0+ 820724 474 2.4- 0.7+ 980216 568 0.1+ 0.0 820713 323 (1.0- 6.4+) 820724 474 1.5- 1.1+ 980216 568 0.7- 0.4- 820714 323 1.2+ 1.1- 820725 801 0.2+ 0.0 980217 568 0.3- 0.2+ 820715 688 (4.0+ 2.7+) 820812 675 2.3- 0.6- 980217 568 0.6- 0.3- 820715 688 (8.0+ 3.0+) 820814 675 1.7- 1.3- 980218 568 0.9+ 0.1+ 820715 474 2.1+ 1.3+ 820819 801 0.7+ 1.0+ 980218 568 0.5+ 0.2+ 820715 474 1.0- 0.6- 820911 675 0.5- 0.2- 980425 426 0.1+ 0.3+ 820716 707 0.8- 1.1+ 1990/ 980425 426 0.1- 0.9+ 820716 474 0.9- 0.3- 900526 413 2.2+ 2.1+ 980425 426 0.5- 0.9+ 820716 474 0.4+ 1.4- 900529 413 0.1+ 0.7- 2014/ 820717 707 1.1- 0.3- 900611 372 2.2- 1.5- 140622 Q62 0.4+ 0.1+ 820719 413 2.5+ 3.0+ 900615 413 0.5- 0.2+ 140622 Q62 0.1- 0.1- 820720 323 (1.7+ 4.5+) 900625 675 (4.9+ 1.8+) 140622 Q62 0.0 0.3- 820721 372 (5.2+ 3.7+) 900625 675 0.4- 1.1- 140625 Q62 1.4+ 1.0+ 820722 474 2.5+ 1.1- 900626 675 0.1+ 3.0- 140625 Q62 0.9+ 0.5+ 820722 474 (0.2- 6.1+) 900627 372 (4.0- 1.6-) 140625 Q62 0.9+ 0.3+ 820723 801 0.2- 0.6+ 900719 372 (5.1- 3.1-) 140726 Q62 0.3- 0.4+ 820723 707 0.0 0.1- 900720 474 0.6+ 0.8- 140726 Q62 0.5- 0.6+ 820723 474 1.2+ 0.2- 900720 474 2.2+ 0.5- 140726 Q62 0.2- 0.7+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2019 Nov. 15