25143 Itokawa

This image was captured by a Japanese space probe Hayabusa. Objects lacking a critical mass don't "go spherical," and so this asteroid looks like a space potato.

The asteroid, measuring no more than a few city blocks,(540 × 270 × 210 meters) was named after Hideo Itokawa, the father of rocket science in Japan. It was discovered in 1998 by NEAR. There is a chance this asteroid will strike the Earth within a million years.

Hayabusa used an ion drive (doesn't that sound so cool) and deposited on the asteroid the names of several thousands of individuals.