Achelous is a relatively fresh crater on Ganymede adjacent to the similarly sized Gula.

It has an outer lobate ejecta deposit which extends with a radius of about a crater from the rim[1] The two craters, similar in size have a "pedestal", an outward-facing, sloped scarp that ends the continuous ejecta blanket.

In ejecta blankets of Martian craters, similar features are seen, suggesting impacts into a volatile and rich material.

Lower-resolution images taken under higher sun illumination showed that both craters have extended bright rays, especially Achelous, which demonstrates that these craters are relatively younger than the rest of the landscape.

This article about an impact crater on a moon of Jupiter is a stub.