remnant3 - Remnants of Rock and Ice Asteroids Comets and...

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Remnants of Rock and Ice: Asteroids, Comets, and Dwarf Planets
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Small Bodies in the Solar System asteroids rocky or metallic in composition most are located between the orbits of Mars and Jupiter
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Kuiper belt comets orbit beyond Neptune orbit in same direction and plane as the planets Oort cloud comets orbit at the outer fringe of the Solar System spherically distributed about the Sun Small Bodies in the Solar System Comets - made mostly of ice
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A Note on Names asteroid – a rocky leftover planetesimal comet – an icy leftover planetesimal orbiting the Sun If it’s ice it’s a comet meteor – a flash of light in the sky caused by a particle entering the atmosphere, regardless of its origin meteorite – any piece of rock that fell to the ground from space, regardless of its origin
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Properties of Asteroids small in size. the largest one, Ceres , is only 1,000 km across not spherical in shape. gravity not strong enough to compress rocky material some are fragments from asteroid collisions
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Properties of Asteroids asteroid belt . between the orbits of Mars & Jupiter Some share Jupiter’s orbit. known as Trojan asteroids A few cross Earth’s orbit. they are called Near-Earth asteroids
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The Asteroid Belt Jupiter’s gravity disrupts the orbits of asteroids with periods of an integer fraction of Jupiter’s. orbital resonances created gaps… like in Saturn’s rings known as the Kirkwood gaps This explains why no planet formed in the asteroid belt.
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Measuring Asteroid Properties Composition Three categories: 1. very dark asteroids which contain Carbon-rich materials found in outer regions of the asteroid belt 2. brighter asteroids which contain rocky materials found in inner regions of the asteroid belt 3. asteroids which contain metals such as Iron
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NEAR Shoemaker
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Hayabusa
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Comets One of the most beautiful sights in the sky. Throughout human history, these “hairy” stars would appear. like planets, they moved with respect to the fixed stars unlike planets, they were not confined to the ecliptic and disappeared after several weeks They were taken as omens of good or bad fortune.
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