2004 FH

Near-Earth asteroid February 2018 yes 2004 FH #FFC2E0 Asteroid 2004 FH.gif Flyby of asteroid 2004 FH;image-description-extended the object that flashes by is a man-made satellite. LINEAR Lincoln Lab's ETS 16 March 2004 2004 FH 2004 FH NEOAten 21 Nov 2025 (JD 2461000.5) 1 6184 days (16.93 years) 1.0559 AU 0.5826 AU 0.8193 AU 0.2888 0.7415 yr (270.84 days) 333.74° 1.3292 ms / day 0.0549° 258.20° 69.180° 0.000484 AU 24 m (calculated)30 m (estimate) 0.0504 h min on 0.20 (assumed) S (assumed) 25.7 2004 FH is a micro-asteroid and near-Earth object of the Aten group, approximately 30 meters in diameter, that passed just 43000 km on above the Earth's surface on 18 March 2004, at 22:08 UTC. It was the 11th-closest approach to Earth recorded 2008 11 21 on.record-definitions The asteroid was first observed on 16 March 2004, by astronomers of the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico. Orbit and classification thumb|left|Trajectory of 2004 FH in the Earth–Moon system 2004 FH is an Aten asteroid. It passed 43,000 km from the Earth on 18 March 2004. For comparison, geostationary satellites orbit Earth at 35,790 kilometers. Despite its small size, it is still the fourth-largest asteroid detected coming closer to the Earth than the Moon. Had this object hit Earth, it would probably have detonated high in the atmosphere. It might have produced a blast measured in hundreds of kilotons of TNT, but may not have produced any effect on the ground. It could also have been an Earth-grazing fireball if it had been much closer but not close enough to impact.November 2017 On 17 March 2044 the asteroid will pass no closer than 0.0116 AU e6km e6mi unit off from the Earth. 2004 FH also has the distinction of having the lowest inclination of any known near-Earth asteroids. Two weeks later another asteroid approached even closer, 2004 FU 162, which was smaller; and a few years later 2009 DD 45, which was closer in size, passed by at similar distance. Physical characteristics 2004 FH is an assumed stony S-type asteroid. Rotation period 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+). This makes this object a fast rotator, currently among the Top 100 known to exist. The photometric observations also revealed that 2004 FH is a tumbler with a non-principal axis rotation. Diameter and albedo 2004 FH has been estimated to measure approximately 30 m off us in diameter. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 24 meters based on an absolute magnitude of 25.7. Notes image-description-extended Flyby of asteroid 2004 FH (center dot being followed by the sequence). The other object that flashes by is an artificial satellite. Images were taken by Stefano Sposetti and composited by Raoul Behrend of Geneva Observatory. record-definitions Rankings depend on definitions of meteoroid and approach. The 2–10 m 1972 grazer was at 57 km, the 44 kg 1990 grazer was about 100 km, possible 2006 grazer size and altitude not available. See List of asteroid close approaches to Earth. References 30em JPL Small-Body Database Browser: (2004 FH) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3177202 23 November 2017 Jet Propulsion Laboratory 2004-03-19 last obs. JPL Close-Approach Data: (2004 FH) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004FH;cad=1#cad 23 March 2016 last observation: 2004-03-19; arc: 3 days; uncertainty: 3 Chesley Steven R. Chodas Paul W. March 17, 2004 Recently Discovered Near-Earth Asteroid Makes Record-breaking Approach to Earth https://cneos.jpl.nasa.gov/news/news142.html 23 November 2017 NASA's Near Earth Object Program Office 2004 FH http://www.minorplanetcenter.net/db_search/show_object?object_id=2004+FH 23 November 2017 Minor Planet Center Behrend Raoul Raoul Behrend Asteroids and comets rotation curves – (2004 FH) http://obswww.unige.ch/~behrend/page5cou.html#04f00h 23 November 2017 Geneva Observatory 11 November 2018 https://web.archive.org/web/20181111134209/http://obswww.unige.ch/~behrend/page5cou.html#04f00h dead 2004 FH 23 November 2017 Asteroid Lightcurve Database (LCDB) External links MPEC 2004-F24 Images of 2004 FH at Klet Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend 2004+FH 2004FH # Category:Minor planet object articles (unnumbered) # 20040318 20040316