Nakano Note (Nakano wa Kangaeru noda) NK 2837 221P/LINEAR
The following improved orbital elements, by S. Nakano, are from 176 observations 2002 to 2015. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.68 arc second. The residuals for 2015 January and March observations are +15" and +26" mainly in R. A. respectively from the prediction in NK 2311 (= HICQ 2014) by T. Kobayashi with the delta-T correction = -0.01 day. The comet will pass 0.74 AU on 2025 June 1 and 0.48 AU on 2036 July 11 UT from Jupiter. See the previous orbits in NK 904, NK 1799 and NK 2331. Epoch = 2015 June 27.0 TT T = 2015 July 11.62253 +/- 0.00027 (m.e.) TT Peri. = 39.94715 +/- 0.00010 Node = 229.75726 +/- 0.00004 (2000.0) Inc. = 11.42339 +/- 0.00003 q = 1.7583105 +/- 0.0000009 AU e = 0.4917802 +/- 0.0000002 a = 3.4597442 +/- 0.0000007 AU n' = 0.15315744 +/- 0.00000005 P = 6.435 +/- 0.0000019 years T = 2002 July 27.59693 TT Epoch = 2002 July 25.0 TT Peri. = 39.62843 e = 0.4861147 Node = 230.07721 (2000.0) a = 3.4843830 AU Inc. = 11.41260 n'= 0.15153580 q = 1.7905733 AU P = 6.504 years T = 2009 Jan. 24.89449 TT Epoch = 2009 Jan. 9.0 TT Peri. = 39.69868 e = 0.4872680 Node = 230.03385 (2000.0) a = 3.4788072 AU Inc. = 11.41875 n'= 0.15190026 q = 1.7836958 AU P = 6.489 years The predicted orbit for the 2021 return is as follows: T = 2021 Dec. 18.07061 TT Epoch = 2021 Dec. 12.0 TT Peri. = 40.11629 e = 0.4926362 Node = 229.70298 (2000.0) a = 3.4553659 AU Inc. = 11.42772 n'= 0.15344863 q = 1.7531274 AU P = 6.423 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2002/ 020531 215 0.0 0.3+ 020622 246 0.8+ 0.2+ 020414 608 0.2- 0.2+ 020531 215 0.5- 0.1- 020622 246 0.1+ 0.1+ 020414 608 0.3- 0.6+ 020531 215 0.2- 0.1+ 020625 608 0.9+ 1.1- 020414 608 0.4- 0.1+ 020531 213 0.2+ 0.5- 020625 608 1.2+ 0.7- 020414 644 (3.1+ 0.7-) 020531 213 0.2- 0.3- 020625 608 1.1+ 0.7- 020425 608 1.0- 0.7- 020601 170 0.0 0.2- 020701 170 0.9+ 0.6- 020425 644 (2.8+ 1.0-) 020601 170 0.2- 0.6- 020701 170 0.3+ 0.2+ 020425 608 1.0- 0.1- 020601 360 0.4- 0.5- 020707 170 0.8+ 1.8- 020425 644 (2.6+ 0.2+) 020601 360 0.1- 0.5- 020707 170 0.1+ 0.3- 020425 608 0.3- 0.8+ 020601 232 0.3+ 0.9+ 020707 246 0.4+ 0.0 020425 644 (2.7+ 0.6-) 020601 232 0.7- 1.6+ 020707 246 0.6+ 0.3- 020509 704 0.5- 0.1- 020602 644 0.1- 0.4+ 020707 246 0.3+ 0.1- 020509 704 0.9- 0.5+ 020602 644 0.1- 0.5+ 020707 246 0.4+ 0.0 020509 704 1.1- 1.1+ 020602 644 0.1+ 1.1+ 020707 246 0.4+ 0.2- 020509 704 0.5- 0.0 020603 644 0.3+ 0.1+ 020709 704 0.1- 0.6+ 020509 704 0.8- 0.4- 020603 644 0.1+ 0.0 020709 704 0.5- 0.1- 020509 644 0.6- 0.7- 020603 644 0.8- 0.1- 020709 704 1.1+ 0.2- 020509 644 0.5- 0.9- 020605 699 (0.7+ 3.3-) 020709 704 0.3- 0.5+ 020509 644 0.8- 1.1- 020605 699 0.5+ 0.2+ 020709 704 0.5+ 0.3+ 020510 704 1.0- 0.3+ 020605 699 0.6+ 0.3- 020723 170 1.8+ 0.1- 020510 704 1.0- 0.2+ 020605 704 0.8+ 0.0 020723 170 0.8+ 0.4+ 020510 704 1.2- 0.4+ 020605 699 0.3+ 0.1+ 020726 170 1.1+ 1.2- 020510 704 (2.2+ 0.3-) 020605 704 0.5+ 0.2+ 020726 170 0.2- 1.0- 020511 704 0.2- 0.7+ 020605 704 0.8+ 0.0 020726 170 0.7+ 0.9- 020511 704 0.4- 0.7+ 020605 704 0.5+ 0.0 020726 170 1.0- 0.0 020511 704 0.1+ 0.3+ 020605 704 0.5+ 0.4+ 020803 170 0.9+ 0.5- 020511 704 0.9- 0.0 020605 360 0.3- 0.7- 020803 170 (2.0+ 1.8+) 020511 704 0.7- 0.3+ 020605 360 0.4- 0.6- 020805 360 0.2+ 0.1- 020512 704 0.0 0.5+ 020606 704 0.3+ 0.4+ 020805 360 0.1- 0.2- 020512 704 0.3- 0.0 020606 704 0.8+ 0.4+ 020808 170 1.8+ 0.3+ 020512 704 0.8- 0.7+ 020606 704 0.5+ 0.9+ 020808 170 1.8- 0.3- 020512 704 0.5- 0.2+ 020606 704 0.6+ 0.8+ 020808 170 0.3+ 0.1- 020512 704 0.8- 0.9+ 020606 704 0.7+ 1.3+ 020811 848 1.6- 1.0- 020512 704 0.6- 0.9+ 020607 704 0.0 0.1+ 020811 848 1.2+ 0.1+ 020512 704 0.7- 0.3+ 020607 704 0.7+ 0.1- 020811 848 1.8+ 0.6- 020512 704 0.9- 0.1+ 020607 704 0.5- 1.0+ 020901 848 (2.7+ 1.0-) 020513 704 0.3- 1.0+ 020608 170 0.3- 1.1- 020901 848 (2.0+ 0.3+) 020513 704 0.7- 0.8+ 020609 170 0.6+ 1.4- 2009/ 020513 704 0.9- 1.1+ 020609 704 0.6+ 0.3+ 090601 H10 1.6- 0.5- 020513 704 0.7- 0.8+ 020609 704 0.5+ 0.4+ 090601 H10 1.8- 1.1- 020513 704 0.5+ 0.9+ 020609 704 0.6+ 0.0 090601 H10 (3.4- 3.1-) 020514 704 0.5- 0.2+ 020609 704 0.4+ 0.2+ 090603 H10 0.3- 1.0- 020514 704 0.7- 0.0 020609 704 (4.1+ 2.7-) 090603 H10 (2.6- 0.6-) 020514 704 0.7- 0.5+ 020609 349 1.0+ 0.4- 090603 926 0.9- 0.0 020514 704 0.3- 0.3+ 020609 349 0.3+ 0.4- 090603 926 0.1- 0.3+ 020516 704 0.1+ 0.1- 020609 349 0.3- 0.7- 090603 926 1.8- 0.6- 020516 704 1.0- 0.4- 020610 704 1.5+ 1.1+ 090815 215 0.4+ 1.0+ 020516 704 0.0 0.4- 020610 704 1.1+ 0.2+ 090819 215 1.1- 0.3- 020516 704 0.3- 0.3- 020610 704 1.3+ 0.6+ 090820 204 0.4+ 0.8+ 020516 704 0.6- 0.1+ 020610 704 1.2+ 0.9- 090823 215 1.0- 1.2+ 020517 675 1.6- 0.5+ 020610 704 1.4+ 1.1+ 090828 204 0.2+ 0.3- 020517 608 0.3- 0.1- 020611 213 0.2- 1.2- 090828 204 0.6+ 0.6+ 020517 608 0.1- 0.8- 020611 213 1.3+ 0.2- 090915 B42 0.5+ 1.5+ 020517 608 0.2+ 0.8- 020611 204 0.7+ 0.2- 090915 B42 0.7+ 1.3+ 020521 704 0.4- 0.3+ 020611 204 0.4+ 0.4- 090915 B42 0.9+ 0.9+ 020521 704 0.9- 0.6+ 020611 204 0.5+ 0.0 090927 204 0.4+ 0.7+ 020521 704 0.3- 0.5+ 020616 620 0.1- 0.7- 2015/ 020521 704 0.2- 0.7+ 020616 620 0.4- 0.4- 150125 F51 0.7+ 0.0 020521 704 0.7- 1.2+ 020616 620 0.3+ 1.2- 150125 F51 0.3+ 0.1+ 020522 568 (1.6- 4.2+) 020618 118 0.9+ 0.4- 150125 F51 0.5+ 0.2+ 020530 699 0.4- 0.4+ 020618 118 0.6+ 0.2+ 150327 F51 0.2- 0.3- 020530 699 0.4- 0.3+ 020622 246 0.2- 0.3- 150327 F51 0.2- 0.4- 020530 699 0.1+ 0.2- 020622 246 0.5+ 0.3- 150327 F51 0.2- 0.1- 020530 699 0.2- 0.2- 020622 246 0.8+ 0.3- 150327 F51 0.1- 0.0 ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2015 Apr. 3