Close flyby parallax:  In this composite imagery created by Gianluca Masi and provided by the NASA/JPL Telescopes in Education (TIE) program, 2004 FH is seen seemingly in two places at the same time during its closest-ever observed Earth flyby on 18 March 2004, at about 500,000 km. (310,500 miles) while coming in closer. This small asteroid is seen at upper left where it appeared to be as observed from the Southern TIE (SoTIE) telescope at Las Campanas in Chile (MPC code I05), observed by Gianluca Masi and Franco Mallia working remotely from Italy. And 2004 FH is also seen at lower right where it appeared to be when observed from about 12,000 km. (7,450 miles) away at Ondrejov Observatory in the Czech Republic (MPC code 557). The two images, about five seconds apart in time, were superimposed on a Digitized Sky Survey (DSS) plate to fill in the sky dome between the two perceived positions.
      An animation of the SoTIE observations was posted by Sky & telescope March 24th (also with a stacked image) and Space.com March 19th. For more about this historical flyby, see A/CC's coverage and news links on March 17th, 18th, 19th, and 29th. For more about TIE and robotic telescopes, see A/CC's report from last June.