Nakano Note (Nakano wa Kangaeru noda) NK 4397 P/PANSTARRS (2015 F1 = 2021 A11)
The following improved orbital elements, by S. Nakano, are from 216 observations 2015 to 2021. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.63 arc second. Residuals of the recovery observations from the prediction in NK 3667 (= HICQ 2019/2020/2021) were +3'.4 for Right Ascension and -1'.6 for Declination with the delta-T correction = -0.20 day. The comet has passed 0.46 AU from Jupiter on 1975 Dec. 2 UT. Before this approach, orbit was T= 1968 10 13.4, q= 4.038 AU, e= 0.042, Peri.= 35.6, Node= 72.4, i= 3.3, a= 4.214 AU, P= 8.65 years. See the previous orbits in NK 2983, NK 3144, NK 3667 and CBET 4933 (same orbit). Epoch = 2021 Nov. 2.0 TT T = 2021 Oct. 27.46649 +/- 0.00926 (m.e.) TT Peri. = 187.50347 +/- 0.00165 Node = 40.38846 +/- 0.00027 (2000.0) Inc. = 2.80286 +/- 0.00003 q = 2.5432748 +/- 0.0000099 AU e = 0.2776720 +/- 0.0000022 a = 3.5209419 +/- 0.0000174 AU n' = 0.14918178 +/- 0.00000110 P = 6.607 +/- 0.0000489 years T = 2015 Mar. 14.96791 TT Epoch = 2015 Feb. 27.0 TT Peri. = 187.14174 e = 0.2781065 Node = 40.43066 (2000.0) a = 3.5207420 AU Inc. = 2.80450 n'= 0.14919449 q = 2.5416007 AU P = 6.606 years The predicted orbit for the 2028 return is as follows: T = 2028 June 15.06749 TT Epoch = 2028 May 29.0 TT Peri. = 187.28755 e = 0.2690471 Node = 40.11073 (2000.0) a = 3.5450348 AU Inc. = 2.78849 n'= 0.14766356 q = 2.5912534 AU P = 6.675 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2015/ 150421 C10 1.8- 0.9+ 150607 703 (2.7- 1.7+) 150124 G96 0.0 0.3+ 150421 C10 1.3- 0.7+ 150607 703 (2.4- 1.5+) 150124 G96 0.1- 0.2+ 150421 A71 (4.8+ 4.6-) 150607 703 (2.7- 1.7+) 150124 G96 0.1- 0.3+ 150422 A71 (6.5+ 5.8-) 150611 D90 0.0 0.2- 150124 G96 0.0 0.2+ 150422 349 1.0- 0.6+ 150611 D90 0.1+ 0.1- 150321 F51 0.2+ 0.2- 150422 349 1.0- 0.4+ 150611 D90 0.3+ 0.5- 150321 F51 0.3+ 0.0 150424 A77 1.2- 0.9+ 150612 372 0.5- 0.3- 150321 F51 0.2+ 0.1- 150424 A77 0.3- 0.5+ 150612 372 0.5- 0.5- 150321 F51 0.3+ 0.1- 150424 A77 0.6- 0.1+ 150615 958 0.3- 0.5- 150322 H01 0.2- 0.1- 150424 E07 0.0 0.1- 150615 958 0.3+ 0.2- 150322 H01 0.3- 0.1- 150424 E07 0.1+ 0.2- 150615 958 0.1+ 0.6+ 150322 H01 0.2- 0.1- 150513 D90 0.2- 0.3- 150617 G45 1.9- 0.7+ 150322 H01 0.3- 0.1- 150513 D90 0.3+ 0.0 150617 G45 1.4- 0.4+ 150322 Q62 1.2- 0.1+ 150513 D90 0.3- 0.1- 150617 G45 1.2+ 0.2+ 150322 Q62 0.9- 0.1- 150515 F51 0.1+ 0.2- 150617 G45 1.1+ 0.2- 150322 Q62 0.4- 0.1+ 150515 F51 0.1+ 0.2- 150620 W96 0.7+ 0.1+ 150322 568 0.2+ 0.3- 150515 F51 0.1+ 0.2- 150620 G45 0.7- 0.2+ 150322 568 0.2+ 0.4- 150516 K25 0.2- 0.0 150620 W96 1.3- 1.4+ 150322 Q62 1.1- 0.4+ 150516 K25 0.5- 0.1+ 150620 G45 0.1+ 0.8+ 150322 568 0.2+ 0.4- 150516 K25 (2.0- 0.9+) 150620 G45 0.8+ 1.3+ 150322 568 0.2+ 0.4- 150517 A71 0.3- 0.0 150620 G45 0.8+ 0.7+ 150322 568 0.2+ 0.4- 150517 A71 0.3- 0.7+ 150620 G45 1.1+ 1.3+ 150322 Q62 0.1- 0.1- 150517 A71 0.2- 0.3+ 150620 G45 1.3+ 1.0+ 150322 Q62 0.0 0.2+ 150517 A71 0.4- 0.0 150620 J01 0.5+ 0.0 150322 Q62 0.5- 0.6- 150518 F51 0.3+ 0.3- 150620 J01 0.6+ 0.0 150322 Q62 0.3+ 0.3+ 150518 F51 0.2+ 0.3- 150620 J01 1.6+ 0.0 150322 Q62 0.2- 0.5- 150518 F51 0.3+ 0.3- 150621 G45 0.1- 0.9+ 150322 Q62 0.8- 0.3+ 150518 F51 0.3+ 0.3- 150621 G45 0.4- 1.3+ 150322 Q62 0.3- 0.0 150520 372 1.0- 1.1+ 150621 G45 0.1- 0.7+ 150322 Q62 0.5- 0.1- 150520 372 1.2- 1.3+ 150621 G45 0.2- 0.5+ 150322 Q62 0.4- 0.0 150520 372 1.2- 1.3+ 150621 G45 (1.2- 2.1+) 150322 Q62 0.0 0.2- 150522 D90 0.4- 0.4+ 150621 G45 0.1- 1.9+ 150322 Q62 0.1- 0.2- 150522 D90 0.4- 0.1- 150621 G45 0.3+ 1.1+ 150322 Q62 0.3- 0.0 150522 D90 0.5- 0.3- 150622 E85 0.3+ 0.4- 150322 Q62 0.2- 0.0 150522 583 1.4- 0.6+ 150622 E85 0.5+ 0.5- 150322 O75 0.7- 0.8- 150522 583 1.0- 0.8+ 150622 E85 0.4+ 0.2- 150322 O75 0.9- 0.3- 150522 583 1.3- 0.2+ 150622 E85 0.3+ 0.3- 150322 O75 0.5- 0.4- 150522 583 1.4- 1.2+ 150626 D90 0.9+ 1.9- 150322 O75 1.3- 0.1- 150522 583 1.2- 0.8+ 150626 D90 0.6+ 0.3- 150322 O75 1.1- 0.1+ 150522 583 1.5- 0.4+ 150626 D90 0.3- 1.0+ 150323 W96 0.3+ 0.1- 150522 583 0.6- 1.1+ 150628 E85 0.2+ 0.3- 150323 W96 1.1+ 0.4- 150525 G45 1.3- 0.5+ 150628 E85 0.7+ 0.7- 150323 W96 0.7- 1.0- 150525 G45 0.9- 0.9+ 150628 E85 0.6+ 0.4- 150323 Q62 0.5- 0.1- 150525 G45 0.6- 0.5+ 150704 D90 1.1+ 0.3+ 150323 Q62 0.0 0.5- 150525 G45 1.4- 0.4+ 150704 D90 1.0+ 0.0 150323 Q62 0.0 0.3- 150525 G45 1.2- 0.5+ 150704 D90 1.2+ 0.2- 150323 Q62 0.9+ 0.6+ 150525 G45 1.4- 0.6+ 150704 G40 0.5+ 0.1+ 150323 Q62 0.4- 0.1- 150525 585 0.7- 0.7+ 150704 G40 0.7+ 0.4- 150323 Q62 0.0 0.4- 150525 585 0.2+ 0.4- 150711 D95 1.1+ 0.0 150324 Q62 0.0 0.3- 150525 585 0.0 0.3- 150711 D95 1.0+ 0.1- 150324 Q62 0.3+ 0.1+ 150525 585 0.7+ 0.2- 150715 215 0.9+ 0.6+ 150324 Q62 0.0 0.2+ 150525 585 0.4+ 0.1+ 150715 215 1.0+ 0.3- 150324 Q62 0.7- 0.3+ 150525 585 0.1+ 0.5+ 150722 D90 0.4+ 0.6+ 150324 Q62 0.4+ 0.1- 150526 372 0.1- 0.8+ 150722 D90 0.0 0.4+ 150324 Q62 0.1- 0.2+ 150526 372 0.5- 0.5+ 150722 D90 0.9+ 0.0 150326 I39 0.9+ 0.4- 150527 703 (3.8- 2.0+) 150808 D90 0.6+ 0.2- 150326 I39 0.9- 0.1+ 150527 703 (4.2- 2.5+) 150808 D90 0.3+ 0.2+ 150326 I39 0.7- 0.0 150527 703 (3.0- 1.9+) 150808 D90 1.1+ 0.6- 150328 W96 0.4- 0.0 150527 703 (2.1- 1.7+) 150814 E07 0.1+ 0.5+ 150328 W96 0.1- 0.1- 150528 E85 0.1+ 0.4- 150814 E07 (2.0+ 0.6+) 150329 D90 0.6- 0.2+ 150528 E85 0.3- 0.5- 150816 E07 0.8+ 0.1- 150329 D90 0.0 0.1+ 150528 E85 0.2- 0.2- 150816 E07 1.8+ 1.3+ 150329 D90 0.7- 0.5+ 150528 E85 0.1+ 0.4- 2021/ 150412 J01 0.5- 0.8+ 150529 J01 0.3- 1.0+ 210113 Z84 0.5+ 1.2+ 150412 J01 0.6- 0.8+ 150529 J01 0.2- 1.2+ 210113 Z84 0.1+ 0.6- 150412 J01 1.4- 1.5+ 150529 J01 0.5- 1.6+ 210113 Z84 0.2- 1.2- 150414 D90 0.9- 0.2+ 150605 E07 0.2+ 0.2- 210210 J04 0.1+ 0.4+ 150414 D90 0.5- 0.1- 150605 E07 0.1+ 0.2- 210210 J04 0.0 0.3+ 150414 D90 0.3- 0.2- 150605 E07 0.2+ 0.1- 210210 J04 0.3+ 0.8+ 150416 215 (2.5- 0.7+) 150605 K25 0.6+ 0.1- 210213 Z84 0.1+ 0.8+ 150416 215 (3.2- 1.3+) 150605 K25 0.1- 0.3- 210213 Z84 0.3+ 1.1+ 150416 215 (2.0- 0.3+) 150606 D90 0.2+ 0.3- 210213 Z84 0.5+ 0.9+ 150416 474 0.2- 0.1+ 150606 D90 0.3- 0.1- 210213 Z84 0.0 0.9+ 150416 474 0.3- 0.2+ 150606 D90 0.5+ 0.4- 210214 Z84 0.6+ 1.0+ 150416 474 0.1- 0.2+ 150606 A71 0.2- 0.4+ 210214 Z84 0.9+ 0.6+ 150419 D90 1.9- 0.2+ 150606 A71 0.2- 0.4+ 210214 Z84 0.5+ 0.6+ 150419 D90 0.4- 0.2+ 150606 A71 0.1- 0.2+ 210214 Z84 0.0 0.7+ 150419 D90 0.3+ 0.2- 150607 703 1.0- 0.8+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 Feb. 16