JPL has a ephemeris calculator that will determine where celestial bodies can be found in the sky. This is useful if you’re trying to find how far away a certain planet or asteroid is.
You could use this to keep track of 2004 MN4, an asteroid which will come close to the earth In 2029. It will pass inside the Moon’s orbit, although it won’t hit either the moon or earth. It should be visible with the naked eye — if you live in Africa, Europe or parts of Asia that is. MN4 is about 1000 feet across and would be locally but not globally devastating if it hit the earth.
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