2004 FH is a micro-asteroid and near-Earth object of the Aten group, approximately 30 meters in diameter, that passed just 43,000 km (27,000 mi) above the Earth's surface on 18 March 2004, at 22:08 UTC.

Despite its small size, it is still the fourth largest asteroid detected coming closer to the Earth than the Moon.

[citation needed] On 17 March 2044 the asteroid will pass no closer than 0.0116 AU (1,740,000 km; 1,080,000 mi) from the Earth.

[3] In March 2004, two rotational lightcurves of 2004 FH were obtained from photometric observations by astronomers Petr Pravec, Stefano Sposetti and Raoul Behrend.

Lightcurve analysis gave a rotation period of 0.0504 hours (3.02 minutes) with a brightness amplitude of 1.16 and 0.75 magnitude, respectively (U=3/2+).