The astroid named Apophis will make a first appearance on April 13, 2029 and, if it goes through the "trajectory keyhole", will make a second appearance seven years later, on April 13, 2036.
APOPHIS - Discovered on June 19, 2004, is an asteroid about as wide as the Empire State Building is tall. On April 13, 2029, it will streak through space within 20,000 miles (32,200 km) of Earth, the closest any celestial object of that size has come to our planet in modern history. If it gets within 600 miles of Earth's "gravitational key-hole" it will go around the sun and hit our planet 7 years later in 2036. This site is dedicated to watching Apophis.