Nakano Note (Nakano wa Kangaeru noda) NK 4490 C/2021 D2 (ZTF)
The following improved orbital elements, by S. Nakano, are from 110 observations 2021 Feb. 19 to June 7. Perturbations by Mercury to Neptune and three minor planets, Ceres, Pallas and Vesta, were taken into account. The mean residual is +/- 0.54 arc second. The comet has passed 4.44 AU from Saturn on 2019 June 14 and 3.69 AU from Jupiter on 2020 Aug. 11 UT. See an orbit in CBET 4947. Epoch = 2022 Jan. 21.0 TT T = 2022 Feb. 3.98766 +/- 0.01259 (m.e.) TT Peri. = 125.02965 +/- 0.00348 Node = 305.67802 +/- 0.00029 (2000.0) Inc. = 83.83044 +/- 0.00025 q = 2.9463411 +/- 0.0001023 AU e = 1.0013566 +/- 0.0000891 1/a = -0.0004604 +/- 0.0000302 1/AU origin = +0.000036 (Q= 6) future = -0.000226 The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2021/ 210319 H06 0.5- 0.1- 210512 T08 0.0 0.2- 210219 I41 0.0 0.4- 210319 H06 0.1- 0.1+ 210521 A98 (0.3- 3.4+) 210219 I41 0.1+ 0.1- 210319 Q11 0.2- 0.2- 210521 A98 (0.2- 3.6+) 210219 I41 0.1+ 0.0 210319 Q11 0.3- 0.0 210521 A98 1.2- 0.1+ 210219 I41 0.4+ 0.0 210319 Q11 0.3- 0.2- 210522 T05 0.2- 0.6- 210309 I41 0.1+ 0.5- 210321 K83 0.2+ 0.6+ 210522 T05 0.0 0.4- 210309 I41 0.1+ 0.5- 210321 K83 0.3+ 0.8+ 210522 T05 0.7+ 1.2- 210309 I41 0.1+ 0.2- 210330 215 0.2+ 0.1- 210522 T05 0.4+ 0.1- 210309 I41 0.2+ 0.3- 210330 215 0.0 0.1+ 210523 C47 0.1+ 0.6+ 210309 I41 0.5+ 0.2- 210330 215 0.1- 0.2+ 210523 C47 0.0 0.4+ 210310 L01 0.1+ 0.4- 210415 K77 0.1+ 0.7+ 210528 T08 0.2- 0.3+ 210310 L01 0.6- 0.7+ 210415 K77 1.7- 0.1- 210528 T08 0.3- 1.0- 210310 L01 0.0 0.1- 210418 T08 0.4+ 0.0 210528 T08 0.2- 0.5+ 210310 291 0.1+ 0.1+ 210418 T08 0.8- 0.8- 210528 T08 0.3- 0.3- 210310 291 0.1+ 0.0 210418 T08 0.0 0.5- 210528 213 0.1- 0.6- 210310 291 0.1+ 0.1+ 210418 T08 1.4- 1.2+ 210529 213 0.1- 0.4- 210311 N51 0.1- 0.1- 210420 Q11 1.7+ 0.9+ 210529 213 0.6- 0.5- 210311 N51 0.1- 0.2- 210420 Q11 1.6+ 0.8+ 210530 T05 0.2- 1.3- 210311 N51 0.0 0.1- 210420 Q11 1.9+ 1.0+ 210530 T05 0.6- 1.2- 210311 N51 0.2+ 0.7+ 210421 Q11 1.4+ 1.0+ 210530 T05 0.0 0.0 210311 N51 0.4- 0.6+ 210421 Q11 1.6+ 0.9+ 210530 T05 0.0 0.1- 210312 033 0.0 0.0 210421 Q11 1.5+ 0.8+ 210531 C10 (2.8- 2.0-) 210312 033 0.1+ 0.1+ 210422 Q11 0.1- 0.2- 210531 C10 0.8+ 0.9+ 210312 033 0.1- 0.2- 210422 Q11 0.2- 0.1- 210531 C10 0.7+ 0.5+ 210313 204 0.0 0.5- 210422 Q23 0.3- 0.0 210602 C10 0.1- 0.3+ 210313 204 0.3+ 0.3- 210422 Q23 0.0 0.0 210602 C10 0.0 0.0 210315 I89 0.2+ 0.2- 210422 Q11 0.2- 0.1- 210602 C10 0.0 0.1+ 210315 I89 0.4+ 0.2- 210424 349 0.4+ 0.2+ 210603 A77 0.4- 1.3+ 210315 J04 0.2- 0.4- 210424 349 0.6- 0.5- 210603 A77 0.2- 1.3+ 210315 J04 0.1+ 0.1- 210510 T05 0.4- 0.4- 210603 A77 0.0 0.9+ 210315 J04 0.1- 0.0 210510 T05 0.3- 1.1- 210607 D95 0.0 0.6+ 210318 Z08 0.2- 0.0 210510 T05 0.5- 1.1- 210607 D95 0.3+ 0.4- 210318 Z08 0.1- 0.4+ 210510 T05 0.3- 0.3- 210607 D95 0.7+ 0.0 210318 G40 0.2- 0.1- 210512 213 0.7- 0.6- 210607 Q11 0.1- 0.1+ 210318 G40 0.9- 0.0 210512 213 0.1+ 0.2+ 210607 Q11 0.1- 0.1+ 210318 Q11 0.4- 0.4+ 210512 T08 0.3- 0.1- 210607 Q11 0.1- 0.1+ 210318 Q11 0.5- 0.1+ 210512 T08 0.3- 0.8- 210607 900 0.6+ 0.1- 210319 H06 0.7- 0.0 210512 T08 0.1- 0.8- 210607 900 0.2+ 0.8+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 June 24