These basaltic meteorites from 4-Vesta are known as eucrites
and carry a unique signature of one of the oldest hydrogen reservoirs in the solar system.
The team's interpretation of the howardites and eucrites
was augmented by recent close-in observations of Vesta's surface by NASA's Dawn spacecraft.
The rock belongs to a group of meteorites known as eucrites
and considered to be fragments chipped from the giant asteroid 4 Vesta.
The three meteorite types -- the eucrites
, howardites and diogenites -- came from an asteroid big enough for its surface rock to melt, possibly from the heat of radioactive elements inside it, concludes a team headed by Dale P.
A kind of meteorite called eucrites
, for example, has been tentatively associated with the large asteroid Vesta, though this link is typical of such studies in that the limited data available fall far short of proving the eucrites
actually came from Vesta.