HED group
HED group stands for Howardite-Eucrite-Diogenite meteorites. These are three subgroups of achondrites which, although different in mineral composition, share a number of other characteristics (such as isotopic chemistry) which suggest they are probably related. The HED meteorites are believed to come from the same parent body, specifically from the large asteroid Vesta. Because of Vesta's very unusual composition among asteroids and the relatively good match between its composition and that of the HED meteorites, the relationship is thought to be relatively well established.
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