Asteroid sizes compared. Composite satellite image showing the comparative sizes of eight asteroids. Left is Vesta. Right (from top to bottom): 21 Lutetia, 253 Mathilde, 243 Ida (243 Ida 1 Dactyl), 433 Eros, 951 Gaspra, 2867 Steins, 25143 Itokawa. Lutetia, with a diameter of 130 kilometres, was the largest asteroid visited by a spacecraft until Vesta. Vesta is considered a protoplanet because of its size. It dwarfs all the other bodies in this image, with a diameter of approximately 530 kilometres, and orbits the Sun between the orbits of Mars & Jupiter. It is the second largest known asteroid.
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