Asteroid 2010 ST3 (IMAGE) Center for Astrophysics | Harvard & Smithsonian Caption Two images of 2010 ST3 (circled in green) taken by PS1 about 15 minutes apart on the night of Sept. 16 show the asteroid moving against the background field of stars and galaxies. Each image is about 100 arc seconds across. Credit PS1SC Usage Restrictions None License Licensed content 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.