An asteroid is a rock-like object with an irregular shape. It floats in the solar system, and is small in relation to the planets, measuring anywhere from a few metres to several hundred kilometres across. They travel from a place closer to the sun to a place farther away from the sun, while bracketing the planet. An orbit is the path through space followed by one object as it moves around another. For instance, the moon has an almost circular orbit around the earth.
Most asteroids travel in elliptical orbits.
A satellite is an object that moves in an orbit around a planet, with the planet being the satellite's primary gravitational influence. Satellites are often referred to as moons. Unlike a satellite, which is primarily influenced by the gravity of a planet, Asteroid 3753 is also influenced by the gravity of the sun, and perhaps by some other planets in our solar system. As it follows its path, Asteroid 3753 is both attracted to and repelled by the earth. A horseshoe orbit is one in which the object moves along a path away from earth and eventually turns around and goes the other way, travelling the other direction so that it comes closer to earth.