Mimas, moon of Saturn
Beloved if only because of its resemblance to a certain sci-fi film location…
Mimas is small and icy, but it’s also home to “Herschel” — the name astronomers have given that massive crater situated on the moon’s leading hemisphere.
At 139-kilometers wide, Herschel is almost one-third the diameter of Mimas itself, and is what makes it seem so Death Star-ish. (BTW, the Herschel crater was discovered three years after the release of that Star Wars - but those films do have a knack for predicting some astronomical discoveries).
Plus, it’s also geeky cool that temperature maps of Mimas reveal hot regions that look like Pac-Man eating a dot.