ИСТИНА

On August 22, 2017, the spacecraft Cassini sent back the final batch of images of Saturn's natural moon Hyperion (S VII). These images had a resolution starting at 20 meters per pixel. Even with these new high-resolution data Hyperion appeared to be a challenge for planetary cartography. First challenge is the irregular shape of its body, close to a triaxial ellipsoid, which does not allow us to use standard cartographic projections and software packages. Second reason is Hyperion’s chaotic rotation. With the proof of the fact of its chaotic rotation, the IAU stopped assigning names to objects and recording them. Despite this, descriptions of various unnamed craters appear in published papers. Moreover, Hyperion does not have an established coordinate system. Hyperion has not been mentioned in IAU reports since 1990. The 1979 IAU Report suggests using a sphere with a radius of R=112 km for mapping, however, this was even before the Voyagers approached Hyperion in 1980, 1981. Then there are references to 5 named objects on its surface. The Gazetteer of Planetary Nomenclature provides directions of axis counting. This is all the information available.