Nakano Note (Nakano wa Kangaeru noda) NK 4489 C/2021 D1 (SWAN)
The following improved orbital elements, by S. Nakano, are from 329 observations 2021 Feb. 28 to May 11. 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 comet has passed 2.83 AU from Jupiter on 2020 June 12 UT. K. Kadota, Ageo, gives CCD total magnitude= 16.6 (H10= 13.1) on 2021 May 9 UT. See orbits in CBET 4939 and CBET 4965. Epoch = 2021 Mar. 7.0 TT T = 2021 Feb. 27.60892 +/- 0.00055 (m.e.) TT Peri. = 72.22303 +/- 0.00080 Node = 311.27117 +/- 0.00021 (2000.0) Inc. = 31.46076 +/- 0.00011 q = 0.9017992 +/- 0.0000086 AU e = 0.9906590 +/- 0.0000427 1/a = +0.0103582 +/- 0.0000473 1/AU origin = +0.011784 (Q= 6) future = +0.010194 a = 96.54 AU P = 948.6 years The following residuals in seconds of arc are from the above orbital elements: Date Code Residual(") Date Code Residual(") Date Code Residual(") 2021/ 210304 718 (2.5- 0.5+) 210323 I81 0.1+ 0.2- 210228 K88 0.2- 0.0 210305 K74 1.3+ 0.1- 210323 G09 1.5- 1.7- 210228 K88 0.1- 1.0- 210305 K74 1.4+ 0.2+ 210323 I81 0.7- 0.1- 210228 K88 0.8- 0.5- 210305 K74 0.5+ 0.6- 210323 I81 0.3- 0.3- 210228 K88 0.3- 0.2+ 210305 K74 0.7+ 0.2- 210323 I81 0.1- 0.1- 210228 K88 0.0 0.3- 210305 G11 0.1- 0.3- 210324 A77 1.3+ 1.4+ 210228 K88 0.7+ 0.9+ 210305 G11 0.6- 0.2- 210324 A77 1.6+ 1.2+ 210228 A71 0.9- 0.7- 210305 G11 0.9+ 0.8+ 210324 970 0.6- 0.3- 210228 A71 0.2- 0.1+ 210305 247 0.0 0.2+ 210324 970 0.3- 0.7- 210228 A71 0.1- 0.2- 210305 G11 (0.6+ 3.7+) 210324 I81 0.0 0.5- 210228 A71 1.0- 0.5+ 210305 G11 0.0 0.7+ 210324 I81 0.8+ 1.2+ 210228 A71 0.4- 0.5+ 210305 247 0.3- 0.1+ 210324 I81 0.5- 0.0 210228 204 0.1- 1.3- 210305 G11 0.9- 0.0 210324 I81 1.4+ 0.5+ 210228 204 0.9- 0.6- 210306 K88 0.3+ 0.2- 210324 I81 0.2- 0.4+ 210228 204 0.9- 1.2- 210306 K88 0.5+ 0.3+ 210326 349 0.3+ 0.3+ 210228 204 0.3- 1.8- 210306 K88 0.4+ 0.2+ 210326 349 0.2+ 0.7+ 210228 204 0.2- 0.7- 210306 K88 0.6- 0.8- 210326 349 0.5+ 0.2+ 210228 204 0.9+ 0.1+ 210306 K77 0.4- 0.6- 210326 349 0.4+ 0.8+ 210228 204 0.3+ 0.0 210306 K77 0.1+ 0.2- 210329 970 1.1- 0.5- 210228 970 0.0 1.9- 210306 204 0.4+ 0.3- 210329 970 0.6- 0.5- 210228 970 (2.4- 1.1+) 210306 K77 0.7- 0.3- 210329 G09 0.1- 1.1+ 210301 N88 0.8- 0.1- 210306 204 0.0 1.1- 210329 970 0.6- 0.5- 210301 N88 0.1+ 0.3- 210306 204 0.3- 0.8- 210329 G09 0.1+ 0.4+ 210301 N88 0.3+ 0.4+ 210307 970 0.3- 0.9- 210329 G40 0.0 0.1+ 210301 K88 1.5- 1.4+ 210307 970 0.2+ 1.1+ 210329 G40 0.1- 0.2+ 210301 K88 0.2- 0.2+ 210307 204 0.6+ 1.1+ 210330 970 0.5+ 0.2- 210301 K88 1.5+ 0.0 210307 204 (2.1+ 2.3+) 210330 970 0.4- 1.1- 210301 K88 1.0- 1.0+ 210308 587 0.5- 0.4- 210331 A77 1.7+ 0.1+ 210301 K88 0.7+ 0.3- 210308 587 1.0- 0.5+ 210331 A77 1.3+ 0.7- 210301 K88 0.5- 0.5+ 210308 587 0.8- 0.9+ 210331 A77 (0.2- 3.0-) 210301 A71 0.7- 0.2- 210309 970 (0.1- 3.2+) 210401 I81 0.6- 0.5- 210301 A71 0.3- 0.5- 210309 970 0.2- 0.3- 210401 I81 0.1- 0.2- 210301 595 0.2- 0.4- 210309 A77 0.6+ 0.8+ 210401 I81 1.9- 1.2- 210301 595 0.2+ 0.2- 210309 A77 (0.1+ 2.7+) 210401 I81 0.0 0.7+ 210301 A71 1.1- 0.1- 210309 A77 0.5+ 1.1+ 210401 I81 0.2+ 0.2+ 210301 K61 0.7+ 0.4- 210309 G40 0.1+ 0.1+ 210402 H06 0.5- 0.0 210301 595 0.3- 0.2+ 210309 G40 0.0 0.1+ 210402 H06 0.4- 0.2+ 210301 K61 0.0 0.6- 210310 349 0.2+ 0.6+ 210402 A77 0.9+ 0.3+ 210301 K61 0.0 0.7- 210310 349 0.5+ 0.3+ 210402 A77 0.5+ 1.7+ 210301 A71 0.8- 0.9+ 210310 367 0.1+ 0.1+ 210402 A77 0.2+ 1.1+ 210301 K61 0.0 0.2- 210310 367 0.5+ 0.8+ 210402 I81 0.6- 0.6- 210301 K61 0.3- 0.4+ 210310 367 0.7+ 0.0 210402 I81 0.9- 0.4- 210301 A71 0.2- 0.0 210310 K88 0.1- 0.3- 210402 I81 0.7+ 1.5+ 210301 215 0.2+ 0.2+ 210310 K88 0.2- 0.0 210402 I81 1.1- 0.4- 210301 K61 1.1+ 0.2+ 210310 K88 0.3- 0.5- 210402 I81 0.4- 0.4+ 210301 K61 0.6+ 0.6+ 210310 587 1.7- 1.0- 210403 Z10 0.1+ 0.1- 210301 215 0.3+ 0.3+ 210310 587 0.5- 0.4+ 210403 Z10 0.3+ 0.0 210301 K61 0.5+ 0.8+ 210310 587 0.5- 0.5- 210404 G23 (1.1- 2.2+) 210301 587 0.5+ 0.9+ 210310 G40 0.4+ 0.4+ 210404 G23 (1.2- 3.4+) 210301 587 0.5+ 0.2+ 210310 G40 0.8- 0.1+ 210404 A77 1.5+ 0.8- 210301 215 0.1+ 0.2- 210311 349 0.3- 0.0 210404 A77 1.9+ 0.8+ 210301 587 0.6- 0.6- 210311 349 0.5- 0.1+ 210404 G23 (0.1- 2.0+) 210301 587 0.4- 0.3- 210311 349 0.5- 0.2+ 210404 A77 1.0+ 0.9- 210301 215 0.0 0.6- 210312 A77 1.6+ 1.2+ 210404 247 (2.8- 0.9-) 210301 204 0.2+ 0.4- 210312 A77 (2.2+ 2.0+) 210404 247 (3.5+ 2.3+) 210301 157 0.6- 0.1+ 210312 A77 1.4+ 0.6+ 210405 H06 0.1- 0.1- 210301 204 1.6+ 0.3- 210312 J38 0.8+ 0.5+ 210405 H06 0.3- 0.3- 210301 157 0.2- 0.0 210312 J38 0.4+ 0.4+ 210405 H06 0.1+ 0.3- 210301 204 0.3+ 0.5- 210312 J38 0.4+ 0.9- 210405 349 0.4- 0.4- 210301 157 0.5+ 0.8+ 210312 I81 0.5- 0.2- 210405 349 0.5- 0.6- 210301 204 0.6- 0.0 210312 I81 0.2- 0.2- 210405 367 0.4- 0.0 210301 204 0.2- 0.5- 210312 I81 0.1+ 0.1+ 210405 367 0.2- 0.2- 210301 L06 0.3- 0.4+ 210312 I81 0.2+ 0.2+ 210405 367 0.1+ 0.0 210301 L06 0.3+ 0.5+ 210312 I81 0.4- 0.8- 210406 970 0.5- 0.5+ 210301 204 0.3+ 0.2+ 210312 I81 0.5+ 0.3- 210406 970 0.4- 0.9- 210301 A77 0.4+ 1.4+ 210314 I81 0.1- 0.5- 210408 A77 0.2+ 0.3- 210301 A77 1.0+ 0.7+ 210314 I81 0.0 0.5- 210408 A77 1.0+ 1.0+ 210301 204 0.0 0.3- 210314 I81 0.3+ 0.5- 210408 A77 1.9+ 0.6+ 210301 A77 (1.5+ 2.3+) 210315 349 0.6- 0.9+ 210410 H06 0.1- 0.2+ 210301 A77 0.9+ 0.8+ 210315 349 0.4- 0.7+ 210410 H06 0.2- 0.1+ 210301 204 0.3- 0.2- 210315 349 0.6- 0.9+ 210410 H06 0.6- 0.1- 210301 204 0.5+ 0.1+ 210315 970 0.9- 0.8- 210410 349 0.3- 0.9+ 210301 J77 0.7- 0.7+ 210315 970 0.1- 0.0 210410 349 0.3+ 0.4+ 210301 J77 0.1- 0.6+ 210316 A77 1.1+ 1.6+ 210410 I81 0.3- 0.2- 210301 J77 0.5+ 1.4+ 210316 A77 1.5+ 0.9+ 210410 I81 0.3- 0.2- 210301 J77 1.0- 0.7+ 210316 A77 0.7- 1.3+ 210410 I81 0.3- 0.9- 210301 I81 0.2+ 0.0 210316 I72 0.5- 1.0- 210412 B74 1.2+ 0.6- 210301 J77 0.1- 0.8+ 210316 I72 0.8+ 0.8- 210412 B74 0.3+ 1.0- 210301 I81 0.4- 0.3- 210316 I72 0.5+ 0.3- 210412 B74 1.1+ 0.4- 210301 J77 1.8- 1.0- 210317 204 0.2+ 0.2- 210412 970 1.4- 0.9- 210301 I81 0.1- 0.2- 210317 204 0.3- 1.1- 210412 970 0.6- 0.1- 210301 I81 0.1+ 0.0 210317 970 0.3- 0.6- 210412 I81 0.0 0.5- 210301 I81 0.4+ 0.2- 210317 204 0.4- 0.3+ 210412 I81 0.6- 0.5- 210301 I81 (2.8+ 5.7-) 210317 204 0.5- 0.5- 210412 I81 1.3+ 0.1- 210301 I81 0.2+ 1.1- 210317 970 0.9- 1.0- 210413 I81 0.1+ 0.2- 210302 K88 0.1- 0.7+ 210317 204 0.4- 0.3- 210413 I81 0.3- 0.3- 210302 K88 0.3+ 0.3- 210317 G40 0.4- 0.2- 210413 I81 0.2- 0.0 210302 K88 0.2- 0.0 210317 G40 0.7- 0.0 210413 I81 0.1+ 0.6- 210302 K88 0.0 0.2+ 210319 970 1.4+ 1.4+ 210413 I81 0.0 0.1+ 210302 K88 0.4- 0.3- 210319 970 0.4- 0.7- 210414 A77 1.0+ 1.3+ 210302 G23 0.1- 0.5- 210320 K83 0.3- 0.9- 210414 A77 0.8+ 0.1- 210302 G23 1.4+ 0.9+ 210320 K83 0.1- 0.9- 210414 I81 0.0 1.1- 210302 A71 0.6- 0.7- 210320 K83 0.9+ 0.0 210414 I81 0.2- 0.0 210302 A71 0.1+ 0.4- 210320 204 0.7+ 1.0- 210414 I81 0.2- 0.2- 210302 G23 0.2- 0.4- 210320 204 1.3- 0.9- 210414 I81 0.3+ 0.3+ 210302 A71 0.1- 0.3+ 210321 I72 (2.3- 0.4-) 210415 I81 1.7- 1.8- 210302 A71 0.8- 0.0 210321 I72 0.4+ 0.4- 210415 I81 1.0+ 1.3- 210302 L06 1.2+ 1.1+ 210321 I72 0.7- 0.6- 210415 I81 0.9+ 0.9- 210302 K74 0.8+ 1.0+ 210321 G40 0.8- 0.5+ 210416 215 0.5+ 0.6+ 210302 L06 0.8+ 0.8- 210321 G40 0.4- 0.4+ 210416 215 0.6- 0.1- 210302 K74 0.4+ 0.4- 210322 A77 0.5+ 0.4- 210416 215 (0.7- 2.0+) 210302 235 1.6- 0.3- 210322 A77 1.0+ 0.6+ 210416 970 1.6- 0.1+ 210302 K74 0.1+ 0.9+ 210322 A77 (0.2+ 2.7+) 210416 970 0.5- 0.1- 210302 K74 0.8+ 1.2+ 210322 A77 0.2- 0.1- 210416 970 0.3- 0.2+ 210302 235 0.4- 0.3- 210322 970 0.8- 0.3- 210421 349 1.2- 1.7+ 210302 247 0.3+ 1.1+ 210322 970 0.6- 0.8- 210421 349 0.7- 1.4+ 210302 235 (4.5+ 2.2+) 210323 A77 0.4- 0.5+ 210421 970 0.3- 0.3- 210302 247 0.2+ 1.0+ 210323 215 0.1+ 0.3- 210421 970 0.1- 0.2+ 210302 G11 (0.5+ 3.1-) 210323 215 0.1+ 0.3- 210421 G40 0.8+ 1.5+ 210302 G11 0.8+ 0.8- 210323 215 0.4- 0.4- 210421 G40 0.1- 0.3- 210302 G11 1.5- 0.4- 210323 A77 (0.4+ 2.6+) 210422 970 0.7- 0.3+ 210303 G37 0.2- 0.2- 210323 A77 0.7+ 0.5+ 210422 970 0.7- 0.1- 210303 G37 0.6- 0.1- 210323 G09 (2.1+ 1.2-) 210509 349 0.8+ 0.1+ 210303 349 0.3+ 0.3+ 210323 970 0.8- 0.6- 210509 349 1.8+ 1.3+ 210303 349 0.3+ 0.0 210323 970 1.1- 0.6- 210511 G40 0.2- 0.3- 210303 349 0.1+ 0.1+ 210323 G09 1.1+ 1.9+ 210511 G40 0.3+ 1.2+ 210304 718 0.9+ 0.1- 210323 I81 1.0+ 0.0 210304 718 0.3+ 0.7+ 210323 I81 0.7+ 0.4+ ( ) -------- Rejected Obs.
Associate of the CBAT Syuichi Nakano 2021 June 24