433 Eros is an S-type near-Earth asteroid approximately 34.4×11.2×11.2 kilometres (21.4×7.0×7.0 mi) in size the second-largest near-Earth asteroid after 1036 Ganymed. It was discovered in 1898 and was the first near-Earth asteroid discovered. It was the first asteroid to be orbited by a probe (in 2000). It belongs to the Amor group.Eros is a Mars-crosser asteroid the first known to come within the orbit of Mars.
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