 Complete the following phrase:  NASAs Near Earth Program estimates its size to be in diameter with a mass of around 500 tonnes. will make many more close approaches to Earth, with the approach of 56 September 2095 having a 4.6 chance 1 in 22 of colliding with Earth. The nominal JPL Earth approach in 2095 is with Earth having a radius of approximately . The nominal NEODyS orbit has the asteroid passing from Earth on 6 September 2095, with an apparent magnitude of 12. Due to the asteroids relatively small size, there is very little danger of harm arising from such an impact; rather there would be an impressive fireball as the rock air bursts in the upper atmosphere and pebble sized fragments would likely fall to the ground at terminal velocity. The power of the airburst would be somewhere between the 24 m Sutters Mill meteorite and the 17 m 