2009 DD45

 is a very small Apollo asteroid that passed near Earth at an altitude of 63,500 km on 2 March 2009 at 13:44 UTC. It was discovered by Australian astronomers with the Siding Spring Survey at the Siding Spring Observatory on 27 February 2009, only three days before its closest approach to the Earth. Its estimated diameter is between 15 and 23 metres. This is about the same size as a hypothetical object that could have caused the Tunguska event in 1908.

BBC News Online cites the minimum distance as 72,000 km (about 1/5 lunar distances). passed farther away (40 thousand miles versus 4 thousand miles) but was substantially larger than 2004 FU162, a small asteroid about 6 m (20 ft) across which came within about 6,500 km in 2004, and is more similar in size to 2004 FH. With an observation arc of 7 days and an uncertainty parameter of 3, the asteroid will make its next close encounter with Earth on 29 February 2056 and then potentially around 3 March 2067.