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That will depend on the exact shape, and the material it is made of.You can get an estimate, by assuming a spherical shape, calculating the volume, and multiplying that by some density (for example, the density of water). The actual mass may be a bit more than that if its a rocky asteroid; a bit less if it's ice, for instance.

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6y ago
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Q: What is the Mass of asteroid 400 meters across?
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