Join NASA in Measuring an Asteroid

In a dramatic example of occultation, a Saturn moon, Rhea, emerges after being occulted by the larger moon Titan.

On the evening of July 3 at 11:05:30 p.m. EDT — at a distance of 280 millon miles into space that poses no threat to Earth — 52 Europa will pass in front of star TYC 0292-00339-1 in the constellation Virgo. The asteroid will eclipse the star’s light for 17.9 seconds in a process known as occultation. Here on Earth, astronomers can measure the exact length of time the star’s light is blocked and use those calculations to help verify the size of 52 Europa. They’ll also have alive Web chat to discuss how to measure the asteroid 52 Europa on the evening of July 3, 2011, from 9 p.m. to midnight EDT. You can view a map of the occultation’s path across North America.
Ahead of the live Web chat on July 3, you may already have some questions about occulations, eclipses, transits, and 52 Europe. Below is some information that you may find useful ahead of the event.
What is asteroid 52 Europa?
By volume, asteroid 52 Europa is ….. Continue reading Join NASA in Measuring an Asteroid