On April 19th asteroid 2014 JO25 made its closest approach to Earth at a distance of about 1 million miles. The asteroid was discovered in May 2014 by astronomers using the Catalina Sky survey. Radar imaging of the asteroid shows it to be a contact binary asteroid. Each segment is about 2000 feet, with a rotation period of about 3.5 hours.
The following images were made the day after closest approach and are a composite showing the movement of the asteroid for period of about 45 minutes. Image file is about 12 megabytes, click the read more to view.