Tyrannosaurus has been characterized as a common S-type asteroid. The overall spectral type for members of the Vesta family is that of a V-type.: Vestian asteroids have a composition akin to cumulate eucrites (HED meteorites) and are thought to have originated deep within 4 Vesta's crust, possibly from the Rheasilvia crater, a large impact crater on its southern hemisphere near the South pole, formed as a result of a subcatastrophic collision.