Solar System, technical/Asteroid belt

The asteroid belt is between 2 and 3.2 astronomical units from the Sun.

Vesta

 * diameter= 530 kilometres
 * features= Veneneia basin

Vesta may have been melted 4.5 mya and it is believed to once have volcanic activity. Smaller asteroids may have deposited carbon material to Vesta, contrasting its bright color.

Vesta doesn't have enough gravity to form it into a complete sphere, which is why it is not a dwarf planet.

The Dawn spacecraft has visited Vesta as one of its objectives.

Main belt comets
These are comets that are within the asteroid belt. Only a handful of main belt asteroids have been discovered. It is uncertain what causes these objects to have a trail, but this event only occurs for a few days at a time.