The Apollo asteroid group is named after the sun god Apollo. These asteroids are a group of near-Earth asteroids that cross Earth's orbit and are named after Apollo in reference to the sun's role as a source of life-giving light and energy.

The Mercury, Venus, Earth and Mars have many asteroids - they are contained in a belt called the Apollo Asteroids [See related question]

Apollo 2 was an unmanned mission, so it had no crew.

Officially there was no Apollo 2. There was an unmanned test flight of the Saturn V that took place after the Apollo 1 disaster, but at the time NASA's administration had not decided to continue using the Apollo name. Therefore Apollo 2 does not exist