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Vesta - formally known as 4 Vesta. It is an asteroid in the asteroid belt and was thought to be part of a protoplanet. (although the existence of any sort of planet existing, is under debate). It is the second largest object in the asteroid belt, after Ceres the dwarf planet [See related link].
Yes. Afew asteroids have smaller asteroids orbiting them as moons. The best known case is the asteroid Ida and its moon Dactyl.
Venus does not have any moons, but there is at least one known asteroid orbiting it.
The asteroid belt is a region about a hundred million miles across, so there's no such thing as "a year on the asteroid belt". Any given asteroid in the core region of the belt could have an orbital period from a little under 3 up to nearly 6 years. 1 Ceres, for example, has an orbital period of a bit under 1682 days (4.6 years).
Well I guess any asteroid could hit Earth.For a complete list of NEO - see related link .There are several hundred asteroids that could hit Earth, most of them have not been named, or even discovered yet.
Saturn
no they do not have any orbiting moons!!!!
Callisto
Mercury and Venus are the only two major planets in our solar system without moons. They are the two planets closer to the Sun than Earth.Two of the five dwarf planets have no known moons : the asteroid Ceres and the Kuiper Belt object Makemake.Neither Mercury nor Venus have any moons.
That would apply to just about any small moon. Larger moons will have a round shape.
Any planet past the asteroid belt, which is between Mars and Jupiter, is considered a gas giant, except for Pluto. Although Pluto is no longer classified as a planet, when it used to be classified as such, it was the only rocky planet past the asteroid belt.
yes any asteroid can be seen which is in our solar system can be seen.they are very small so they can not be seen through the naked eye(but an asteroid called vesta which was discovered in 1807 is the only asteroid which can be seen).you will need a telescope to see and to observe asteroids but since space is dark and also since asteroids are small and dark we can see them even better through bigger telescopes,radio telescopes, and orbiting telescopes(Hubble).