"Close Encounter: 2013 NK4 Asteroid Visible in Night Sky"
Potentially hazardous asteroid 2013 NK4, between 400 and 1,000 meters across, made a close approach to Earth, passing harmlessly by more than eight times the distance to the Moon. NASA imaged the asteroid and discovered it may be a contact binary asteroid. While it made its closest approach on April 15, it should still be visible with a telescope on April 16 and 17.