Another astroid XF-11 is planned to hit in 2028 and it is a mile wide.there is an estaminet of 100,000 asteroids as big as SG344.its said that it could be and old rocket or a burned out rocket booster.
If a astroid as big as SG344 is 100 to 250 feet wide it would be devastating but not for the inter world.We are trying to figure out more about SG344 and if it is likely to hit Earth or not.SG344 is slowly moving away if it does we will have to wait tell 2028 when it's back in our range.