Nakano Note (Nakano wa Kangaeru noda) NK 4495 P/Lemmon (2008 CL94 = 2021 A12)
The following improved orbital elements, by S. Nakano, are from 74 observations 2008 to 2021. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.39 arc second. Residuals for the recovery observations were -92" for Right Ascension and -11" for Declination from the prediction in NK 1837 (= HICQ 2020/2021) with the delta-T correction = +0.26 day. The comet has passed 0.66 AU on 1921 July and 0.91 AU on 1986 Oct. 11 from Jupiter and 3.78 AU from Saturn on 2007 Sept. 10 UT. See a linked orbit in CBET 4992 (same orbit). Epoch = 2021 Sept.23.0 TT T = 2021 Sept.19.96368 +/- 0.11543 (m.e.) TT Peri. = 80.40416 +/- 0.00846 Node = 33.31403 +/- 0.00019 (2000.0) Inc. = 8.34613 +/- 0.00005 q = 5.4209427 +/- 0.0001465 AU e = 0.1205187 +/- 0.0000202 a = 6.1637950 +/- 0.0002187 AU n' = 0.06440681 +/- 0.00000343 P = 15.303 +/- 0.0008143 years (+/- 0.30 day) T = 2006 July 10.02644 TT Epoch = 2006 July 4.0 TT Peri. = 82.73938 e = 0.1204454 Node = 33.54111 (2000.0) a = 6.1829757 AU Inc. = 8.34188 n'= 0.06410734 q = 5.4382646 AU P = 15.374 years The predicted orbit for the 2037 return is as follows: T = 2037 Apr. 2.18534 TT Epoch = 2037 Apr. 12.0 TT Peri. = 84.06712 e = 0.1181556 Node = 33.13692 (2000.0) a = 6.1668292 AU Inc. = 8.32544 n'= 0.06435928 q = 5.4381836 AU P = 15.314 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2008/ 090224 691 0.2- 0.2- 090402 691 0.4- 0.1+ 080208 G96 0.9+ 0.6+ 090317 G96 0.1+ 0.8- 090402 691 0.2- 0.1- 080208 G96 1.0+ 1.4+ 090317 G96 1.3- 0.4- 090402 691 0.8- 0.4+ 080208 G96 0.7+ 1.0+ 090317 G96 0.0 0.8- 090417 691 0.4+ 0.4+ 080208 G96 0.4+ 1.2+ 090317 G96 0.2+ 0.6- 090417 691 0.0 0.3- 080210 691 0.7+ 0.2+ 090317 G96 0.3- 0.3+ 090417 691 0.8- 1.7+ 080210 691 0.6+ 0.1+ 090317 G96 0.0 0.3- 090420 691 0.2- 0.0 080210 691 0.2+ 0.5+ 090317 G96 0.2- 0.3+ 090420 691 0.9- 0.1+ 080305 G96 0.2+ 0.1- 090317 G96 0.4- 0.3- 090420 691 0.4- 0.7+ 080305 G96 0.3+ 0.1+ 090317 G96 0.2- 0.6+ 090422 691 0.3- 0.4- 080305 G96 0.5+ 0.4+ 090317 G96 0.2+ 0.8- 090422 691 1.5- 1.4+ 080305 G96 0.4+ 0.1+ 090317 G96 0.1- 0.2- 090422 691 0.2- 0.4- 080312 G96 0.2+ 0.0 090317 G96 0.8- 0.2- 090613 204 0.4+ 0.3- 080312 G96 0.0 0.3+ 090318 H01 0.9+ 0.5- 2021/ 080312 G96 0.3- 0.4+ 090318 H01 0.7+ 0.7- 210109 568 0.1- 0.1- 080312 G96 0.0 0.2+ 090318 H01 1.2+ 0.6- 210109 568 0.1+ 0.0 080404 G96 0.0 0.5+ 090318 H01 0.9+ 0.7- 210109 568 0.1+ 0.1- 080404 G96 0.1- 0.7+ 090318 G96 0.5+ 1.1- 210109 568 0.1+ 0.0 080404 G96 0.5- 0.6+ 090318 G96 0.4+ 0.9- 210109 568 0.1+ 0.0 080404 G96 0.5- 0.0 090318 H01 0.9+ 0.5- 210109 568 0.1+ 0.0 2009/ 090318 H01 0.8+ 0.6- 210115 568 0.1- 0.1- 090220 691 0.5- 0.0 090319 204 0.3- 0.4- 210115 568 0.1- 0.1- 090220 691 0.2+ 0.5- 090319 204 0.0 0.7- 210115 568 0.1- 0.1- 090220 691 0.8- 0.3+ 090330 850 0.3- 0.3+ 210115 568 0.0 0.1- 090224 691 0.9- 0.2- 090330 850 0.3- 1.0- 210115 568 0.1- 0.1- 090224 691 0.3- 0.2- 090330 850 0.4- 0.4+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 June 26