This movie of asteroid 2014 JO25 was generated using radar data collected by NASA's 230-foot-wide (70-meter) Deep Space Network antenna at Goldstone, California on April 19, 2017.
Transcript:When the observations began 2014 JO25 was 1.53 million miles (2.47 million kilometers) from Earth. By the time the observations concluded, the asteroid was 1.61 million miles (2.59 million kilometers) away.
The asteroid has a contact binary structure -- two lobes connected by a neck-like region. The largest of the asteroid's two lobes is estimated to be 2,000 feet (610 meters) across.
Asteroid 2014 JO25 approached to within 1.1 million miles (1.8 million kilometers) of Earth on April 19. There are no future flybys by 2014 JO25 as close as this one for more than 400 years.
The resolution of the radar images is about 25 feet (7.5 meters) per pixel. 154 images were used to create the movie shown.
More information regarding asteroid 2014 JO25 can be found at: https://cneos.jpl.nasa.gov/news/news196.html
Image credit: NASA/JPL-Caltech/GSSR