Many believe that these asteroids are remnants from a planet that was destroyed in a collision however, the entire mass of the asteroid belt is too little actually to constitute that of a former planet. Later, between the regions of Mars and Jupiter, the asteroids were somehow brought together probably due to gravitational interactions with the giant planets and resulted in the now-famous asteroid belt. Some of this debris, however, was left alone to orbit the Sun. When the solar system was young, dust and rock were pulled together by gravity and gave birth to the first planets.
It is quite possible that these meteorites resulted from the collision of different s-type asteroids. S-type asteroids are very similar in composition to a large variety of stony meteorites, which also share similar spectral characteristics. The term asteroids means starlike, since the first astronomers who studied them thought that they were stars. Such asteroids make up around 17% of all the known asteroids in the solar system. Thus, it is the brightest asteroid ever to be discovered after 4 Vesta. Juno’s spectral classification is S, and its apparent magnitude varies from 7.4 to 11.55.Juno is the second most massive S-type asteroid.Eros is also the first asteroid from the Amor group to be discovered, and the first asteroid to be studied from orbit.It is an S-type asteroid with a mean diameter of 16.8 km / 10.4 mi.
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