Nakano Note (Nakano wa Kangaeru noda) NK 4257 39P/Oterma
The following improved orbital elements, by S. Nakano, are from 243 observations 1942 to 2020. The planetary perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas, Vesta, and non-gravitational effect of sublimating molecule = CO (or N2) using Yabushita's theory (MN 283, 347) were taken into account. The weighting mean residual is +/- 0.71 arc second. The 1999 and 2001 observations were discordance with 2019 recovery observations and 2020 observations (See the residual block). Since comet has passed 0.095 AU from Jupiter on 1963 Apr. 12.3 UT, orbit was significant changed and passed 1.01 AU from Saturn on 2011 June 3 UT. Also comet will pass 0.89 AU from Jupiter on 2025 Jan. 15 UT. Minor planet 1950 CR (Goethe Link) was identified by Nakano (NK 447, MPC 8695). See the previous orbits in NK 318 (1978 ephemeris), NK 381 & NK 400 (1983 prediction), NK 447, NK 810 (= MPC 43334) and CBET 4652 (= NK 3859). Epoch = 2023 June 25.0 TT T = 2023 July 11.62733 +/- 0.00194 (m.e.) TT Peri. = 103.04536 +/- 0.00060 Node = 296.00268 +/- 0.00052 (2000.0) Inc. = 1.54695 +/- 0.00001 q = 5.7071131 +/- 0.0000027 AU e = 0.2104603 +/- 0.0000002 a = 7.2284051 +/- 0.0000040 AU n' = 0.05071546 +/- 0.00000004 P = 19.434 +/- 0.0000160 years Y1 = +0.082 +/- 0.009 Y2 = -0.00609 +/- 0.00021 T = 1942 Aug. 21.09012 TT Epoch = 1942 Aug. 29.0 TT Peri. = 354.70772 e = 0.1447195 Node = 155.83784 (2000.0) a = 3.9623277 AU Inc. = 3.98348 n'= 0.12496215 q = 3.3889017 AU P = 7.887 years T = 1950 July 16.47397 TT Epoch = 1950 July 18.0 TT Peri. = 354.82172 e = 0.1427598 Node = 155.79640 (2000.0) a = 3.9719163 AU Inc. = 3.98245 n'= 0.12450992 q = 3.4048861 AU P = 7.916 years T = 1958 June 10.49776 TT Epoch = 1958 June 6.0 TT Peri. = 354.90424 e = 0.1444849 Node = 155.77574 (2000.0) a = 3.9599809 AU Inc. = 3.98598 n'= 0.12507325 q = 3.3878234 AU P = 7.880 years [ T = 1983 June 18.47748 TT Epoch = 1983 July 5.0 TT Peri. = 55.87321 e = 0.2429695 Node = 331.96289 (2000.0) a = 7.2267784 AU Inc. = 1.94762 n'= 0.05073258 q = 5.4708916 AU P = 19.428 years ] T = 2002 Dec. 22.27260 TT Epoch = 2003 Jan. 1.0 TT Peri. = 56.37197 e = 0.2445887 Node = 331.58525 (2000.0) a = 7.2420645 AU Inc. = 1.94297 n'= 0.05057204 q = 5.4707373 AU P = 19.489 years The predicted orbit for the 2042 return is as follows: T = 2042 July 11.93030 TT Epoch = 2042 July 15.0 TT Peri. = 124.77931 e = 0.1553946 Node = 287.97766 (2000.0) a = 6.9983911 AU Inc. = 1.68465 n'= 0.05323616 q = 5.9108788 AU P = 18.514 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 1942/ 481127 754 0.5- 0.3+ 571203 662 0.1- 1.0+ 420217 062 2.4- 0.5- 481204 062 0.2- 1.4- 1958/ 420218 062 0.2- 0.3+ 481225 062 1.2- 1.5- 580120 689 0.1+ 1.1+ 1943/ 1949/ 580120 689 0.6- 1.4+ 430327 062 1.4- 2.0+ 490105 062 1.7- 0.2+ 580121 711 1.2- 0.1+ 430427 690 1.3- 1.5- 490122 062 0.3- 0.8+ 580121 711 0.3- 0.3+ 430429 062 1.3- 2.2- 490128 662 0.2- 1.1- 580122 711 0.9- 0.6+ 430502 062 1.9- 1.1- 490128 662 0.1- 1.0- 580126 711 2.1+ 2.3+ 430503 754 0.8- 2.0- 490128 662 0.5+ 0.1- 580409 662 0.9- 0.1- 430508 662 2.1+ 0.3- 490128 662 0.3+ 0.1- 580409 662 0.8- 0.1+ 430522 754 0.8+ 0.9- 490129 754 1.4- 1.1- 580412 689 0.7- 0.1+ 430523 690 0.0 0.2- 490130 754 2.0+ 2.0- 580412 689 1.5- 0.2- 430525 754 0.6+ 0.2+ 490218 754 (0.1+ 2.6+) 580417 754 2.3- 0.3- 430526 690 1.2- 0.7+ 1950/ 580508 662 0.3+ 1.1+ 430529 754 1.5+ 1.6+ 500208 662 1.3- 0.6+ 580508 662 0.5+ 1.1+ 430529 690 0.4+ 0.1- 500208 662 0.5- 0.5+ 581216 689 1.5+ 0.0 430530 053 1.2+ 0.9- 500211 760 (2.8- 0.4+) 1959/ 430530 053 1.0- 0.1+ 500211 760 1.7- 0.2- 590118 689 0.5- 0.5- 430601 053 1.8- 1.1+ 500211 008 0.3- 0.3- 590118 689 0.6+ 0.2+ 430605 754 0.6+ 1.4+ 500211 008 0.3- 0.2- 590206 689 1.2+ 0.4+ 430608 690 0.2+ 0.2- 500212 062 0.1- 1.3- 590206 689 0.8+ 0.5+ 430609 754 0.3+ 0.5+ 500216 008 0.4- 0.0 590217 711 0.1+ 1.4- 430629 754 1.9- 0.6+ 500309 662 0.2+ 0.0 590217 711 1.4+ 0.4- 430629 754 0.3+ 1.1+ 500309 662 0.5+ 0.2+ 590303 689 0.3+ 1.4+ 430702 754 1.5+ 0.9- 500314 754 0.6- 0.3+ 590303 689 0.0 1.2+ 1944/ 500315 754 0.4- 0.0 590313 662 0.1- 0.8+ 440123 754 0.4+ 1.4+ 500415 711 0.1- 0.1+ 590313 662 1.0- 1.1+ 440204 754 0.3+ 1.2+ 500415 062 (0.9+ 2.7-) 590406 754 (2.5- 0.7+) 440322 711 0.9+ 0.2+ 500416 062 0.3- 0.2+ 590411 689 0.8- 0.1+ 440323 711 0.2- 2.2- 500417 711 0.6- 0.3+ 590411 689 1.2- 0.0 440324 711 0.0 1.7+ 1951/ 590502 754 1.2+ 0.2- 440501 662 0.4- 0.6+ 510105 711 2.4+ 1.2+ 590504 689 0.8- 0.9- 440501 662 0.2- 0.6+ 510108 711 0.3+ 0.4- 590504 689 0.7- 0.3- 440529 754 1.1+ 1.0+ 510112 711 1.3+ 0.1- 590526 689 0.4+ 0.9+ 440614 754 1.5+ 0.8+ 510204 711 0.8+ 1.1- 590526 689 0.6+ 1.2+ 440614 754 0.9+ 0.3+ 510311 062 0.2+ 0.3- 590529 662 1.2+ 0.6- 440615 754 0.3- 0.2- 510311 062 0.0 0.3+ 590529 662 1.5+ 0.6- 440628 662 0.4+ 1.0+ 510411 662 1.8+ 1.1+ 590603 754 1.0- 0.0 440630 662 0.5+ 1.1+ 510411 662 1.7+ 0.7+ 590628 689 0.1+ 0.4+ 440630 662 0.0 1.4+ 510503 754 1.9+ 0.4+ 1960/ 440714 754 0.2+ 0.4- 510505 754 0.3+ 0.7- 600330 689 0.1+ 0.7+ 440716 754 1.1+ 1.2+ 510603 078 0.7+ 0.5- 600330 689 1.1+ 0.0 440721 754 1.4+ 0.3- 1952/ 600518 689 0.5+ 0.6+ 1945/ 520421 754 0.7+ 0.4+ 600525 689 0.2- 1.2+ 450414 711 0.9- 0.0 520423 754 0.8+ 1.0+ 600525 689 0.9+ 1.2+ 450414 711 1.1- 0.4- 520424 754 2.4+ 1.3+ 600619 689 0.7+ 1.5+ 450511 711 0.5- 0.2+ 520620 754 (2.8+ 1.4-) 600619 689 1.1+ 1.8+ 450512 711 1.4- 0.6+ 1953/ 600714 689 (1.6+ 2.6+) 450513 711 0.5- 1.6+ 530702 711 1.6+ 0.9+ 600714 689 (0.9+ 3.0+) 450704 754 0.9- 0.1- 530703 711 0.2- 0.6+ 1961/ 450704 754 0.4- 1.0- 530704 711 0.2- 0.5+ 610521 689 0.4+ 1.1+ 450704 662 0.8+ 1.4+ 530704 711 0.4+ 0.2- 610610 689 0.8+ 0.4+ 450731 662 1.0- 2.0+ 530710 662 0.1- 1.2+ 610720 689 0.1+ 0.4- 450731 662 0.4+ 1.3+ 530710 662 0.2+ 0.9+ 610906 689 0.9+ 0.6+ 450929 662 0.1- 1.0+ 530715 711 0.9+ 0.6- 610906 689 1.1+ 1.5+ 450929 662 1.0+ 0.8+ 530715 711 1.2+ 0.3+ 1962/ 1946/ 1954/ 620807 689 0.0 0.6+ 460629 711 0.2+ 0.6+ 540704 662 0.0 0.9+ 620807 689 1.0- 1.5- 460630 711 0.4- 0.3+ 540705 662 0.9+ 1.1+ 1998/ 460701 711 0.3- 0.3- 540810 754 0.5+ 1.7- 980501 568 1.1+ 0.3+ 460704 711 0.7- 0.9+ 540810 754 0.9+ 0.5- 980501 568 1.0+ 0.3+ 460724 711 0.1+ 0.8+ 540821 662 1.5- 1.3+ 980501 568 1.1+ 0.3+ 460725 711 0.1- 0.2- 540821 662 0.1- 0.5+ 980522 568 1.8+ 0.3+ 460726 711 0.3- 0.9+ 540827 675 0.1+ 0.4+ 980522 568 (3.0+ 0.5-) 460727 711 0.1+ 0.9+ 540827 675 1.4+ 1.3+ 1999/ 460728 662 0.2+ 0.4+ 540829 754 1.6+ 0.0 990509 568 (2.8+ 0.2+) 460728 662 0.4+ 0.3+ 540829 754 1.0- 0.4+ 990509 568 (3.4+ 0.0 ) 460731 754 0.2+ 0.5- 540926 662 0.0 0.6- 990509 568 (2.8+ 0.2-) 460822 662 (0.2- 3.2+) 540926 662 0.1- 0.3+ 990715 568 (3.5+ 0.3+) 460926 662 2.2- 0.0 541003 711 0.3+ 0.2- 990715 568 (3.3+ 0.3+) 460926 662 2.2- 1.1- 541004 711 0.6+ 1.7+ 990715 568 (3.2+ 0.4-) 1947/ 541023 711 0.2+ 0.8- 2001/ 470724 662 0.1+ 0.4- 541024 711 0.1- 0.9- 010813 568(10.0+ 4.5+) 470724 662 0.2+ 0.4+ 1955/ 010813 568 (9.8+ 4.6+) 470725 754 2.3+ 2.1- 550730 662 1.3+ 0.6+ 010820 568(10.0+ 4.4+) 470823 662 0.5- 0.2- 551008 662 0.9- 1.0+ 010821 568(10.5+ 4.5+) 470823 662 0.6+ 0.1- 551008 662 1.0- 1.0+ 010821 568(10.1+ 4.4+) 470924 662 1.1+ 0.5- 551008 662 0.4+ 0.9+ 010919 809(10.2+ 5.2+) 470924 662 0.0 0.4+ 551008 662 0.4+ 0.4+ 010919 809(10.4+ 5.1+) 471010 754 0.2+ 2.0+ 551012 711 0.9- 0.5+ 2019/ 471107 662 0.5- 1.0+ 551012 711 0.9- 0.9- 190703 I11 0.1- 0.0 471107 662 1.1- 2.1+ 551013 711 0.2+ 0.5- 190703 I11 0.1- 0.1+ 1948/ 551106 662 1.3+ 0.8+ 190703 I11 0.1- 0.0 480903 711 0.5+ 0.3+ 551106 662 0.7+ 0.0 190705 I11 0.0 0.0 480905 711 0.1+ 0.3- 551109 711 0.2- 0.6- 190705 I11 0.1- 0.0 480906 711 0.4+ 1.5+ 551111 711 0.4- 0.3+ 190705 I11 0.1- 0.1+ 481001 711 0.1- 0.4+ 551112 711 0.1+ 0.8+ 190705 I11 0.0 0.1+ 481002 711 0.1- 0.8+ 1956/ 2020/ 481009 662 0.4+ 1.4+ 560809 662 0.8+ 0.2- 201018 568 0.0 0.0 481009 662 0.1+ 1.4+ 560809 662 1.3+ 0.4+ 201018 568 0.0 0.0 481009 662 0.2- 1.6+ 561026 662 0.6+ 1.3+ 201018 568 0.0 0.0 481009 662 0.1- 1.6+ 561026 662 0.2+ 0.8+ 201018 568 0.0 0.0 481026 062 (0.1- 2.7-) 561106 062 1.1- 1.3+ 201018 568 0.0 0.0 481029 062 0.8- 0.6- 561107 062 1.3- 1.8- 201018 568 0.0 0.0 481106 008 0.9- 1.4+ 1957/ 201018 568 0.0 0.1- 481107 008 (2.5- 2.0+) 570102 754 0.4+ 0.0 201018 568 0.0 0.0 481124 008 0.4- 0.5+ 570217 754 (8.3- 0.9-) 201018 568 0.1+ 0.1- 481124 008 0.3+ 0.9+ 570218 754 (1.0+ 3.3-) 481127 754 0.9- 0.6+ 571203 662 0.3- 0.5+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2020 Dec. 2