This is a region on the flank of the shield volcano Hecates Tholus, where, in contrast to the rest of the volcano, small impact craters appear to be hidden by a blanket of fine material in a region about 50 km wide and at least 70 km long.
In contrast, we saw earlier that, at the martian volcano Hecates Tholus, a large explosive summit eruption is implicated in the formation of at least one of its calderas.
A domical volcano is termed a tholus, while a pancake-like structure is called a farrum.
On the edge of Bereghinya Planitia lies a 40 km wide volcano named Drolma Tholus. According to the IAU gazetteer for Venus, the feature is named after the "Tibetan goddess of compassion" (USGS, 2004d) and the name was taken from Ann and Imel's Goddesses in World Mythology (1993, p.
The word tholus is derived from the Greek word tholos, and means a small dome-shaped hill or mountain (tholos means a circular building with a conical or vaulted roof).
Kwanzaa Tholus is in the northeastern part of Ceres, and measures about 22 by 12 miles (35 by 19 kilometers), rising about 2 miles above its surroundings.
In the images, Kwanzaa Tholus appears just above and to the right of the center, conspicuous by a sliver of a shadow in the monochrome photograph and appearing like a light-blue, strangely-angled "D" in the elevation image.
There are a large number of tholi (plural of tholus) in the vicinity of Kwanzaa Tholus, and the region is also home to slightly bigger mountains called montes.
On Nov 10 Grafton even captured a tiny bright spot on the top of Hecates Tholus
. The Elysium Mons opposition brightening could be traced, less noticeably, a couple of days on either side of the date of opposition (ca.
"During early November, Olympus Mons and at least four other volcanoes--Ascraeus Mons, Elysium Mons, Hecates Tholus
, and Albur Tholus--appeared as bright spots in CCD images," says Schmude.
and S., marking the locations of Hecates Tholus
and (at the limit of perception) Albor Tholus
, with tiny bright patches indicating the craters Adams and Lockyer.