Selected archival observations of comet C/2025 D1 (Groeller). In some of the panels where the comet appears faint, a dotted white circle marks its location. The white and magenta scale bars represent an angular distance of 10^′′ and a linear distance of 10⁵ km projected at the observer-centric distance of the comet, respectively. J2000 equatorial north is up, and east is to the left. In each panel the antisolar direction (yellow arrow) and the projected negative heliocentric velocity of the comet in the observer’s sky plane (dark orange arrow) are also indicated.