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Not that big, as asteroids and moons go. Rock and ice are fairly dense, so an object just 10 or 20 kilometers in diameter has a mass in the trillions of tons or trillions of tonnes (1015 kg).

The asteroid moon Petit Prince, about 13 kilometers (8 mi) in diameter, orbits the asteroid Eugenia and weighs about 1.2 trillion tonnes. The smaller rocky Martian moon Deimos, averaging 12.5 kilometers in width, weighs about 1.48 trillion tonnes.

The icy Saturn moons Pan and Atlas are about 5 and 6 trillion tons each. Pan is oblong in shape with dimensions 35 x 32 x 21 km.

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Q: How big is a 1 trillion ton asteroid?
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