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physical object > natural object > celestial body > asteroid > Hirayama family |
Hirayama family comparison table |
Subject | has definition | is a kind of |
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asteroid | Also called planetoids or minor planets, the asteroids are tiny planets most of which orbit the Sun between Mars and Jupiter. The largest - and the first discovered - is Ceres, with a diameter of 1,003 km. It is estimated that there may altogether be no fewer than 40000. A few have very elliptical orbits and cross the orbits of several other (major) planets. One or two even have their own satellites (moons). | celestial body |
Hirayama family | A group of asteroids with similar orbital elements. The members of a given family are widely believed to have resulted from collisions between larger parent bodies. | asteroid |
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