Nakano Note (Nakano wa Kangaeru noda) NK 3820 C/2018 F1 (Grauer)

The following improved orbital elements, by S. Nakano, are from 169 observations 2017 Dec. 22 to 2019 May 4. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.57 arc second. Residuals on 2019 observations were +12" for Right Ascension and -3" for Declination from an orbit in NK 3696 (= HICQ 2019). The comet has passed 3.40 AU from Jupiter on 2018 May 15 UT. See the previous orbits in NK 3578, NK 3609 and NK 3696. Epoch = 2018 Dec. 28.0 TT T = 2018 Dec. 14.07645 +/- 0.00067 (m.e.) TT Peri. = 71.62370 +/- 0.00013 Node = 177.29017 +/- 0.00002 (2000.0) Inc. = 46.07079 +/- 0.00007 q = 2.9930368 +/- 0.0000034 AU e = 0.9907353 +/- 0.0000080 1/a = +0.0030954 +/- 0.0000027 1/AU origin = +0.004605 (Q= 8) future = +0.004613 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2017/ 180320 703 0.8- 0.0 180420 V06 0.1- 0.2- 171222 F51 0.1+ 0.1- 180320 703 1.6- 0.1+ 180420 V06 0.0 0.2- 171222 F51 0.2+ 0.4- 180320 703 1.0- 0.4- 180420 A71 0.1- 0.8+ 171222 F51 0.2+ 0.4- 180320 703 1.6- 0.5- 180420 A71 0.3+ 0.2+ 171222 F51 0.2+ 0.1- 180320 A71 0.2- 0.8+ 180420 A71 0.2+ 0.8+ 2018/ 180320 A71 0.6+ 0.9+ 180423 703 1.7- 0.5- 180117 F51 0.1+ 0.2- 180320 A71 0.1- 0.8+ 180423 703 0.6- 0.7- 180117 F51 0.2- 0.2+ 180322 703 0.6- 1.0- 180423 703 0.3+ 0.4+ 180223 G96 0.3- 0.1+ 180322 703 0.3+ 0.6- 180423 703 0.7- 1.1- 180223 G96 0.4- 0.1+ 180322 703 0.4+ 0.2- 180501 B74 0.2- 0.2- 180223 G96 0.2- 0.2- 180322 703 0.3- 0.6+ 180501 B74 0.1+ 0.4- 180223 G96 0.3- 0.2+ 180322 Q11 0.5- 0.2+ 180501 B74 0.1- 0.8- 180310 F51 0.1+ 0.1+ 180322 Q11 0.6- 0.1+ 180505 C23 0.1+ 0.2- 180310 F51 0.1+ 0.0 180322 Q11 0.3- 0.2+ 180505 C23 0.3+ 0.4+ 180310 F51 0.1+ 0.0 180323 Q11 0.4- 0.1+ 180506 J22 0.6+ 0.3- 180317 G96 0.3- 0.0 180323 Q11 0.6- 0.1+ 180506 J22 0.1- 0.5- 180317 G96 0.2- 0.0 180323 Q11 0.3- 0.1+ 180506 J22 0.2+ 0.1+ 180317 G96 0.5- 0.1- 180406 215 0.3- 0.3+ 180509 G96 0.0 0.1- 180317 G96 0.4- 0.6+ 180406 215 0.4- 0.4+ 180509 G96 0.1+ 0.1- 180317 F51 0.2+ 0.1+ 180406 215 0.4- 0.6+ 180509 G96 0.1+ 0.1- 180317 F51 0.2+ 0.1+ 180407 K77 0.1+ 1.4- 180509 G96 0.2+ 0.1- 180317 I52 0.0 0.1+ 180407 K77 0.1+ 0.6- 180510 C23 0.9+ 0.2- 180317 I52 0.2- 0.2+ 180407 J22 0.6+ 1.2+ 180510 C23 0.3+ 0.9- 180317 I52 0.3- 0.1+ 180407 J22 0.4- 0.1- 180518 C23 0.1- 0.4+ 180317 I52 0.1- 0.2+ 180407 J22 0.1- 0.0 180518 C23 0.7+ 0.7+ 180317 F51 0.2+ 0.1+ 180407 349 0.3+ 0.5+ 180604 585 1.2+ 0.1- 180317 F51 0.2+ 0.1+ 180407 349 0.9+ 0.1+ 180604 585 1.9+ 1.1- 180317 I52 0.1+ 0.1+ 180408 D81 0.4- 0.4- 180604 585 0.6+ 0.4- 180317 I52 0.1+ 0.3- 180408 D81 1.3- 0.7- 180604 585 1.3+ 0.5- 180317 I52 0.7- 0.1- 180408 D81 1.8- 0.8- 180604 585 1.6+ 1.5- 180317 I52 0.5- 0.1+ 180410 703 1.6- 0.8- 180604 585 0.5+ 0.9- 180317 B49 1.2- 0.4- 180410 703 1.0- 0.1- 180604 585 0.0 1.5- 180317 B49 1.3- 0.5- 180410 703 0.1- 0.9- 180604 585 0.0 0.4- 180317 B49 1.2- 0.7- 180410 703 0.8- 0.4- 180604 585 0.1- 1.0- 180318 850 1.0- 0.9- 180412 G96 0.1- 0.0 180610 G40 0.1- 0.3+ 180318 850 0.2- 0.2- 180412 G96 0.6- 0.5- 180610 G40 0.5+ 0.1- 180318 850 0.1- 0.8+ 180412 G96 0.1- 0.1- 180704 703 0.6+ 0.5+ 180318 850 0.6+ 0.2- 180412 G96 0.5- 0.5+ 180704 703 0.7+ 0.2+ 180318 I52 0.5- 0.2+ 180412 F51 0.0 0.3+ 180704 703 1.0+ 1.1- 180318 I52 0.7- 0.7- 180412 F51 0.1+ 0.3+ 180704 703 0.8+ 0.7- 180318 I52 0.7- 0.2+ 180412 F51 0.1+ 0.2+ 180704 T05 (2.4+ 0.5+) 180318 I52 0.4- 0.5+ 180412 F51 0.0 0.3+ 180704 T05 0.4+ 0.3+ 180318 G96 0.3- 0.0 180413 T08 (1.5- 2.3-) 180704 T05 0.1+ 0.1+ 180318 G96 0.3- 0.1+ 180413 T08 (1.4- 2.1-) 180704 T05 1.3+ 0.7+ 180318 G96 0.4- 0.2+ 180413 T08 1.0- 0.3+ 180714 J22 0.9+ 1.7- 180318 G96 0.3- 0.2- 180413 T08 1.7- 0.5- 180714 J22 0.4+ 0.8- 180319 G40 0.3- 0.3- 180416 703 0.5- 1.2- 180714 J22 0.4+ 0.8- 180319 G40 0.5- 0.1+ 180416 703 0.7- 1.1- 180716 T05 0.8+ 1.3- 180319 W96 0.2- 0.3+ 180416 703 0.7- 0.4- 180716 T05 0.7- 0.0 180319 W96 0.1+ 0.2+ 180416 703 0.1+ 0.1- 180716 T05 1.6- 0.3+ 180319 W96 0.2+ 0.1+ 180419 A71 0.2+ 0.4+ 180716 T05 0.4+ 0.3- 180319 I52 0.7+ 0.6- 180419 A71 0.2+ 0.3+ 2019/ 180319 I52 0.1+ 0.0 180419 A71 0.1- 0.2+ 190402 H06 0.3+ 0.4+ 180319 I52 0.0 0.2- 180420 703 0.8- 0.6- 190402 H06 0.1+ 0.3+ 180319 I52 0.1- 0.2+ 180420 703 0.5- 0.2+ 190402 H06 0.4+ 0.0 180319 F51 0.1+ 0.1+ 180420 703 0.7- 0.5- 190504 349 0.5+ 0.8+ 180319 F51 0.2+ 0.2+ 180420 703 0.4- 0.5- 190504 349 0.0 0.3+ 180319 F51 0.2+ 0.2+ 180420 V06 0.0 0.2- 180319 F51 0.2+ 0.2+ 180420 V06 0.2- 0.0 ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2019 May 10

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