Nakano Note (Nakano wa Kangaeru noda) NK 4508 C/2021 C4 (ATLAS)

The following improved orbital elements, by S. Nakano, are from 182 observations 2021 Feb. 12 to July 4. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.51 arc second. The comet has passed 3.84 AU from Uranus on 2011 Dec. 7 and 4.15 AU from Jupiter on 2020 Mar. 10 UT. See the previous orbits in CBET 4937 and NK 4487. Epoch = 2021 Jan. 26.0 TT T = 2021 Jan. 17.01959 +/- 0.01426 (m.e.) TT Peri. = 320.22897 +/- 0.00179 Node = 194.27875 +/- 0.00039 (2000.0) Inc. = 132.83917 +/- 0.00053 q = 4.5041023 +/- 0.0000552 AU e = 0.9988136 +/- 0.0001014 1/a = +0.0002634 +/- 0.0000225 1/AU origin = +0.000336 (Q= 6) future = +0.000544 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2021/ 210318 T08 0.2+ 0.4- 210515 F51 0.7- 0.5+ 210212 T05 0.4- 0.4- 210318 T08 0.1+ 0.6- 210515 F51 0.7- 0.5+ 210212 T05 0.5- 0.4- 210318 T08 0.5- 0.2+ 210515 F51 0.5- 0.6+ 210212 T05 0.3+ 1.1- 210318 T08 0.5- 0.1- 210515 F51 0.2- 0.4+ 210212 T05 1.1- 0.6- 210320 T05 0.5- 0.2- 210517 T08 0.4+ 0.4+ 210213 807 0.2+ 0.0 210320 T05 0.3- 0.3- 210517 T08 0.0 0.4- 210213 807 0.2- 0.0 210320 T05 0.1- 0.8- 210517 T08 (1.4+ 2.6-) 210213 807 0.4+ 0.1+ 210320 T05 0.6+ 0.6- 210517 T08 0.0 0.4+ 210213 807 0.3- 0.2- 210322 T08 0.5- 0.7+ 210530 215 0.4+ 0.9- 210213 807 0.0 0.1+ 210322 T08 0.1- 1.1- 210530 215 0.5+ 0.4- 210215 807 0.0 0.0 210322 T08 0.4- 0.4- 210530 215 0.2+ 0.3- 210215 807 0.1- 0.0 210322 T08 0.2+ 0.0 210531 T05 1.1+ 0.8- 210215 807 0.1+ 0.0 210326 T08 0.5- 0.1- 210531 T05 0.1- 0.3- 210215 807 0.3+ 0.4- 210326 T08 0.6+ 0.1- 210531 T05 (2.0+ 1.5-) 210216 W88 0.3- 0.3- 210326 T08 0.3- 0.1+ 210531 T05 0.9+ 0.5- 210216 W88 0.1+ 0.2+ 210326 T08 0.2+ 0.4+ 210601 E85 0.2- 0.6+ 210217 474 0.1+ 0.1- 210403 T08 0.3- 0.1- 210601 E85 0.4+ 0.4- 210217 474 0.0 0.0 210403 T08 0.5+ 0.2- 210601 E85 0.4+ 0.3- 210217 474 0.6- 0.0 210403 T08 0.6+ 0.1- 210602 T08 0.4+ 0.6+ 210217 Q62 0.2+ 0.4+ 210403 T08 0.1- 0.3+ 210602 T08 0.1+ 0.2+ 210217 Q62 0.5+ 0.5+ 210407 T08 0.5+ 0.0 210602 T08 (4.5+ 3.6-) 210218 E94 0.1- 0.1- 210407 T08 0.4+ 0.2- 210602 T08 0.1- 0.8- 210218 E94 0.5+ 0.4- 210407 T08 0.3+ 0.2- 210606 Q64 0.6- 0.3+ 210218 E94 0.1- 1.1- 210407 T08 0.3+ 0.1- 210606 Q64 0.6- 0.3+ 210218 E94 0.6- 0.9- 210411 E94 0.1+ 0.5+ 210606 Q64 0.6- 0.4+ 210218 Q62 1.4+ 0.6- 210411 E94 0.2- 0.9+ 210606 Q64 0.6- 0.4+ 210218 Q62 0.3- 0.3- 210411 E94 0.3+ 0.0 210607 703 (2.8+ 0.6-) 210218 Q62 1.3+ 0.0 210411 E94 1.4+ 0.0 210607 703 (2.5+ 1.1-) 210220 Q62 0.1+ 0.1- 210417 T05 0.4+ 0.1- 210607 703 (2.6+ 1.1-) 210220 Q62 0.1- 0.1+ 210417 T05 0.6+ 0.1+ 210607 703 1.4+ 0.1- 210220 Q62 0.2+ 0.3+ 210417 T05 0.1+ 0.2+ 210609 Q11 0.0 0.5- 210220 474 0.0 0.2- 210417 T05 0.2+ 0.1- 210609 Q11 0.2+ 0.9- 210220 474 0.2- 0.1- 210417 Q62 0.3+ 0.0 210609 Q11 0.1+ 0.8- 210220 474 0.0 0.0 210417 Q62 0.3+ 0.3+ 210611 703 0.4- 1.0- 210222 X02 0.6+ 0.4+ 210417 Q62 0.3+ 0.2+ 210611 703 1.1+ 0.3- 210222 X02 0.3- 0.6+ 210419 T08 0.4+ 0.1- 210611 703 1.3+ 0.5- 210222 Q62 0.2- 0.4- 210419 T08 0.3+ 0.2- 210611 703 1.0+ 1.8- 210222 Q62 0.2+ 0.2- 210419 T08 0.6+ 0.1- 210612 T05 1.1+ 0.3+ 210227 Q63 0.0 0.1+ 210422 E85 0.8+ 0.9- 210612 T05 (2.0+ 0.9-) 210227 Q63 0.0 0.1+ 210422 E85 0.3- 0.3+ 210612 T05 0.3+ 0.3+ 210227 Q63 0.0 0.2+ 210422 E85 0.9- 0.4+ 210612 T05 1.8+ 0.0 210227 Q63 0.0 0.1+ 210422 E85 0.1+ 0.2+ 210613 G96 0.5+ 0.2+ 210302 K93 0.1- 0.3+ 210422 E85 0.1+ 0.3+ 210613 G96 0.4+ 0.3- 210302 K93 0.0 0.0 210422 E85 0.5+ 0.4- 210613 G96 0.5+ 0.3- 210302 K93 0.0 0.2+ 210423 X03 0.4- 0.7+ 210613 G96 0.1+ 0.3- 210302 K93 0.0 0.1+ 210423 X03 0.4+ 0.2- 210614 T08 0.4+ 0.9- 210305 W85 0.4- 0.7+ 210423 X03 1.0- 1.0+ 210614 T08 0.1+ 1.2+ 210305 W85 0.2+ 0.7+ 210423 X03 0.0 0.0 210614 T08 0.9+ 0.5- 210305 W85 0.2- 0.2+ 210423 X03 0.2+ 1.7- 210614 T08 (2.3+ 3.1-) 210305 W85 0.0 0.6+ 210429 E85 0.3- 0.7- 210627 T08 0.3+ 0.5- 210307 Q64 0.5- 0.5+ 210429 E85 0.6+ 0.3- 210627 T08 0.9+ 1.4- 210307 Q64 0.3- 0.3+ 210429 E85 0.2+ 0.7- 210627 T08 0.0 0.1- 210307 Q64 0.4- 0.3+ 210429 E85 0.4+ 0.4- 210627 T08 0.2+ 1.4- 210307 Q64 0.3- 0.3+ 210501 T08 0.6- 0.8+ 210701 E85 (0.3+ 2.1-) 210311 W87 0.4- 0.0 210501 T08 1.0+ 0.9+ 210701 E85 1.3+ 0.3+ 210311 W87 0.1- 0.2+ 210501 T08 0.3+ 0.5- 210701 E85 0.1+ 0.7- 210311 W87 0.3- 0.2+ 210501 T08 0.2+ 0.3- 210701 T08 0.3+ 0.5+ 210311 W87 0.2- 0.2+ 210503 T05 0.8+ 0.7- 210701 T08 0.2+ 0.4- 210312 W94 0.0 0.0 210503 T05 1.0+ 0.2+ 210701 T08 0.7- 0.4- 210312 W94 0.2- 0.2+ 210503 T05 1.1+ 1.2- 210701 T08 0.6+ 0.1+ 210312 W94 0.3- 0.2+ 210503 T05 0.2+ 0.2+ 210704 474 0.1+ 0.4- 210314 W85 0.4- 0.4+ 210509 T08 0.6+ 0.5+ 210704 474 0.1- 0.3- 210314 W85 0.2- 0.3+ 210509 T08 (2.1+ 0.6-) 210704 474 0.1- 0.7- 210314 W85 0.2- 0.5+ 210509 T08 0.2+ 0.2+ 210314 W85 0.1- 0.4+ 210509 T08 0.1+ 0.6+ ( ) -------- Rejected Obs.

Associate of the CBAT Syuichi Nakano 2021 Aug. 15

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