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physical object > natural object > celestial body > asteroid > Hirayama family
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Hirayama family comparison table
Subject has definition is a kind of
asteroidAlso 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 familyA 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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