When an object, either man-made or natural, orbits a planet it is called a satellite.
Yes there are millions of objects that orbit Saturn.
Many smaller objects cross Eris' orbit, so it does not dominate its orbital path. An object must clear its orbit of other objects to be considered a planet.
NO, the orbit of any planet or moon is determined by the size of the two objects involved (example: the Earth and the Sun) and the distance between those two objects: the closer the objects are to each other and the bigger one of the objects is, the stronger the gravitational pull ( large objects have stronger forces on other smaller objects). The orbit of a planet has nothing to do with the Sun's heat.
Ceres is not considered a planet, since it does not dominate its orbit. There are other sizable objects at that distance from the sun, in orbit around the sun. It is a dwarf planet though.
The planet Saturn
Through gravitational pull. The largest object will have smaller objects orbit it (objects close in size will orbit each other, but no planet is close to the size of the sun)
asteroids
Both asteroids and planets are objects that orbit the sun.
In order the planets and objects are:MercuryVenusEarthMarsAsteroid BeltJupiterSaturnUranusNeptunePluto (It's a dwarf planet)
Generally, although objects that orbit dwarf planets and smaller objects such as asteroids can also be called moons.
Many different objects in space revolve around many other things. Usually, it is acceptable to use the term 'satellite' when describing a moon's orbit around a planet, or even a planet's orbit around a star.
The definition of a planet has nothing to do with its composition. A planet is any spherical object orbiting the Sun that has cleared its orbit from other objects.