C/2023 A3 Tsuchinshan-ATLAS

Nice view of comet C/2023 A3 Tsuchinshan-ATLAS last night from Baycrest. This is a 10 second exposure through a 200mm telephoto lens. You can see the thin line of the antitail pointing in the opposite direction of the tail. Antitails are created from dust that a comet has shed along its orbit. They become visible when Earth passes through the plane of the comet's orbit, making the dust easier to detect. This orbital crossing is happening now, and from our perspective, the antitail appears to point toward the Sun, in the opposite direction of the comet's main tail.