Asteroid Itokawa (IMAGE) University of Arizona Caption Asteroid Itokawa as seen by the Hayabusa spacecraft. The peanut-shaped S-type asteroid measures approximately 1,100 feet in diameter and completes one rotation every 12 hours. Credit JAXA Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.