Asgard.

About Asgard

Asgard is the second largest multi-ringed basin on Jupiter's moon Callisto. It is named after Asgard, the realm of the gods in Norse mythology. Asgard is located at a latitude of 32° and a longitude of 142°. The estimated crater retention age of Asgard is circa 4.04. The central part of Asgard is dominated by the domed Doh impact crater. Since multi-ring basins are some of the largest, oldest, and rarest types of craters, they are less understood. Images were first taken of the Asgard basin by the Voyager 1 spacecraft. Later, the Galileo orbiter had several close flybys near Callisto producing several images with resolution as high as 88 m/pixel. Based on Galileo data, the central region of Asgard is expected to be ~ 250 km in diameter, the ring structure reaches ~ 1880 km in diameter, and the crater is suspected to have a ~675 km rim diameter. The outer rim is representative of the ejecta or secondaries with the radii of ~675 km. The basin appears to have a shallow depth. Although hypothesized, there is no distinct crater rim, in the traditional sense, since most of the rings look similar.