Twilight and lower comet altitudes continue to merge here in Tucson as one can see from the color image at 0130UT. Comet C/2021 A1 is about the same magnitude this evening as the past 2 evenings. Astrometrica calculated V=6.4 on 10x20s green filter images, R=6.3 on 4x20s red filter images and V=6.3 on 5x20s unfiltered images at 0133, 0137, 0139UT |
Page last updated: Sun 2 Apr 08:18:47 BST 2023