2021 March 12, 05:03:42 UT Orbital elements: C/2021 D1 (SWAN) = SWAN21D Epoch 2021 Mar. 7.0 TT = JDT 2459280.5 T 2021 Feb. 27.57894 TT Sato q 0.9013557 (2000.0) P Q z +0.0132523 Peri. 72.18369 +0.81213214 -0.43190164 +/-0.0030524 Node 311.27500 +0.08282793 +0.75088900 e 0.9880550 Incl. 31.46594 +0.57756465 +0.49962654 >From 119 observations 2021 Feb. 28-Mar. 11, mean residual 0".61. Epoch 2021 Apr. 16.0 TT = JDT 2459320.5 T 2021 Feb. 27.57944 TT Sato q 0.9013593 (2000.0) P Q z +0.0132411 Peri. 72.18441 +0.81212665 -0.43191223 +/-0.0030524 Node 311.27502 +0.08283783 +0.75088781 e 0.9880650 Incl. 31.46593 +0.57757095 +0.49961917 Residuals in seconds of arc (or two decimals in units of degrees) 210219 249(0.26+ 0.03+)X 210301 K61 0.0 0.7- 210302 K88 0.2+ 0.5- 210220 249(0.65+ 0.53+)X 210301 A71 0.7- 0.9+ 210302 K88 0.3- 0.2- 210221 249(1.04+ 1.03+)X 210301 K61 0.1+ 0.2- 210302 K88 0.1- 0.0 210222 249(1.29+ 0.90+)X 210301 K61 0.3- 0.4+ 210302 K88 0.5- 0.5- 210223 249(1.36+ 1.28+)X 210301 A71 0.1- 0.0 210302 G23 0.3- 0.7- 210224 249(1.25+ 1.00+)X 210301 215 0.3+ 0.2+ 210302 G23 1.2+ 0.7+ 210225 249(1.54+ 1.20+)X 210301 K61 1.1+ 0.2+ 210302 A71 0.7- 0.9- 210227 003 (0.3- 4.6+)Y 210301 K61 0.6+ 0.6+ 210302 A71 0.0 0.6- 210228 X94 (1.6- 0.8+) 210301 215 0.3+ 0.3+ 210302 G23 0.3- 0.6- 210228 K88 0.1+ 0.3+ 210301 K61 0.6+ 0.8+ 210302 A71 0.3- 0.1+ 210228 K88 0.1+ 0.7- 210301 587 0.6+ 0.9+ 210302 A71 1.0- 0.2- 210228 K88 0.5- 0.2- 210301 587 0.6+ 0.2+ 210302 L06 1.1+ 0.9+ 210228 K88 0.0 0.5+ 210301 215 0.1+ 0.2- 210302 A71 (2.4- 0.9+) 210228 K88 0.2+ 0.0 210301 587 0.6- 0.6- 210302 K74 0.7+ 0.8+ 210228 K88 1.0+ 1.1+ 210301 587 0.3- 0.3- 210302 L06 0.6+ 1.0- 210228 A71 0.6- 0.5- 210301 215 0.1+ 0.6- 210302 K74 0.2+ 0.6- 210228 A71 0.1+ 0.3+ 210301 204 0.2+ 0.4- 210302 235 1.7- 0.5- 210228 A71 0.1+ 0.0 210301 157 0.6- 0.1+ 210302 K74 0.0 0.7+ 210228 A71 0.8- 0.8+ 210301 204 1.6+ 0.3- 210302 K74 0.7+ 1.0+ 210228 A71 (1.3- 2.5+) 210301 157 0.2- 0.0 210302 235 0.5- 0.6- 210228 A71 0.2- 0.7+ 210301 204 0.4+ 0.5- 210302 247 0.2+ 1.0+ 210228 204 0.1+ 1.0- 210301 157 0.6+ 0.8+ 210302 235 (4.4+ 2.0+) 210228 204 0.7- 0.3- 210301 204 0.6- 0.0 210302 247 0.0 0.8+ 210228 204 0.7- 1.0- 210301 204 0.2- 0.5- 210302 G11 (0.4+ 3.3-) 210228 204 0.1- 1.6- 210301 L06 0.2- 0.4+ 210302 G11 0.7+ 1.0- 210228 204 0.0 0.5- 210301 L06 0.4+ 0.5+ 210302 G11 1.6- 0.6- 210228 204 1.1+ 0.4+ 210301 204 0.3+ 0.2+ 210303 G37 0.4- 0.4- 210228 204 0.5+ 0.3+ 210301 A77 0.5+ 1.4+ 210303 G37 0.7- 0.3- 210228 970 0.2+ 1.6- 210301 A77 1.0+ 0.7+ 210303 349 0.1+ 0.0 210228 970 (1.4+ 2.5-) 210301 204 0.0 0.3- 210303 349 0.1+ 0.4- 210228 970 (2.1- 1.4+) 210301 A77 (1.6+ 2.3+) 210303 349 0.1- 0.3- 210301 N88 0.8- 0.1- 210301 A77 1.0+ 0.8+ 210304 718 0.6+ 0.5- 210301 N88 0.2+ 0.3- 210301 204 0.3- 0.3- 210304 718 0.0 0.2+ 210301 N88 0.4+ 0.4+ 210301 204 0.5+ 0.1+ 210304 718 (2.8- 0.1+) 210301 K88 1.5- 1.4+ 210301 J77 0.7- 0.7+ 210304 L27 (1.0+ 4.3-) 210301 K88 0.2- 0.2+ 210301 J77 0.0 0.6+ 210304 L27 (4.1- 6.9-) 210301 K88 1.5+ 0.0 210301 J77 0.5+ 1.4+ 210304 L27(13.6- 11.8-) 210301 K88 1.0- 1.0+ 210301 J77 1.0- 0.7+ 210306 K77 (2.9- 0.4+) 210301 K88 0.8+ 0.3- 210301 I81 0.2+ 0.0 210309 A77 0.5+ 0.3+ 210301 K88 0.4- 0.5+ 210301 J77 0.1- 0.8+ 210309 A77 (0.1- 2.3+) 210301 A71 0.6- 0.2- 210301 I81 0.4- 0.3- 210309 A77 0.3+ 0.6+ 210301 A71 0.3- 0.5- 210301 J77 1.8- 1.0- 210310 349 0.1+ 0.2+ 210301 595 0.1- 0.4- 210301 I81 0.1- 0.2- 210310 349 0.4+ 0.1- 210301 595 0.2+ 0.2- 210301 I81 0.1+ 0.0 210311 349 0.2- 0.3- 210301 A71 1.1- 0.1- 210301 I81 0.4+ 0.3- 210311 349 0.4- 0.2- 210301 K61 0.8+ 0.4- 210301 I81 (2.8+ 5.7-) 210311 349 0.4- 0.1- 210301 595 0.2- 0.2+ 210301 I81 0.2+ 1.1- 210301 K61 0.1+ 0.6- 210302 K88 0.2- 0.5+ 2021 March 1, 22:42:11 UT Orbital elements: SWAN21D = C/2021 Dx (SWAN) ? T 2021 Feb. 27.64752 TT Sato q 0.9032452 (2000.0) P Q Peri. 72.25631 +0.81183958 -0.43257692 Node 311.25525 +0.08377312 +0.75100029 e 1.0 Incl. 31.44297 +0.57783956 +0.49887451 From 80 observations 2021 Feb. 28-Mar. 1, mean residual 0".60. 2021 February 26, 12:21:53 UT Orbital elements: SWAN021 T 2021 Feb. 22.4292 TT Sato q 0.581742 (2000.0) P Q Peri. 74.9685 +0.6714701 -0.6482324 Node 323.1490 +0.1952266 +0.6221678 e 1.0 Incl. 36.7764 +0.7148528 +0.4389784 From 3 observations 2021 Feb. 19-23, mean residual 24".66. Residuals in seconds of arc (or two decimals in units of degrees) 210219 249 9.1+ 39.9+ Y 210221 249(0.05- 0.12-)Y 210223 249 5.1+ 16.3+ Y 210220 249 4.9- 40.7- Y 210222 249(0.12+ 0.14-)Y --