Asteroid Steins: A diamond in space

Asteroid Steins seen from a distance of 800 km around the time of closest approach, taken by the OSIRIS imaging system from two different perspectives. The effective diameter of the asteroid is 5 km, approximately as predicted. At the top of the asteroid (as shown in this image), a large crater, approximately 21.5-km in size, can be seen. Scientists were amazed that the asteroid survived the impact that was responsible for the crater.