Potentially Hazardous Asteroids

794 asteroids were officially designated as "Potentially Hazardous" in August 2007, with the number continuing to grow. The simulation PHA.gsim contains these 794 asteroids. If you run this from the Beta version, before you open it go to Preferences and change DoEvents Interval from 50 to 1, so your computer doesn't seem jumpy from the large amount of objects.

This screenshot shows Earth's crowded neighborhood. This represents 1 year, from May 2006 to May 2007. The frame is rotating with Earth's period to keep the Earth / Sun orientation constant. The Sun is off the image towards the 9 o'clock position. The asteroids that look like close calls aren't that close. You can't see the z-axis in this screenshot.