astro.wikisort.org - Asteroid

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. It was the 11th closest approach to Earth recorded as of 21 November 2008^[update].[lower-alpha 2] 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.[2]

2004 FH

Flyby of asteroid 2004 FH [lower-alpha 1]
Discovery[1][2]
Discovered by	LINEAR
Discovery site	Lincoln Lab's ETS
Discovery date	16 March 2004
Designations
MPC designation	2004 FH
Alternative designations	2004 FH
Minor planet category	NEO · Aten[1]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 5
Observation arc	3 days
Aphelion	1.0545 AU
Perihelion	0.5816 AU
Semi-major axis	0.8180 AU
Eccentricity	0.2891
Orbital period (sidereal)	0.74 yr (270 days)
Mean anomaly	302.96°
Mean motion	1° 19m 55.56s / day
Inclination	0.0210°
Longitude of ascending node	290.98°
Argument of perihelion	36.622°
Earth MOID	0.00002265 AU 0.0088 LD · (3390 km)
Physical characteristics
Dimensions	24 m (calculated)[3] 30 m (estimate)[4]
Synodic rotation period	0.0504 h (3.02 min)[3]
Geometric albedo	0.20 (assumed)[3]
Spectral type	S (assumed)[3]
Absolute magnitude (H)	25.7[1]

Orbit and classification

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.^{[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.[5] 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 FU162, which was smaller, and a few years later 2009 DD45, which was closer in size passed by at similar distance.

Physical characteristics

2004 FH is an assumed stony S-type asteroid.[3]

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+).[3][6]

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.[3]

Diameter and albedo

has been estimated to measure approximately 30 meters (100 feet) in diameter.[4] 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.[3]

Notes

References

External links

Wikimedia Commons has media related to 2004 FH.

• MPEC 2004-F24
• Images of 2004 FH at Klet
• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• 2004 FH at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• 2004 FH at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• 2004 FH at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] 2004 FH

2004 FH ist ein Asteroid von etwa 30 m Durchmesser. Er wurde am 16. März 2004 von der LINEAR-Himmelsüberwachung in New Mexico, USA entdeckt. Er bewegt sich in einem Abstand von 0,581 (Perihel) bis 1,054 (Aphel) astronomischen Einheiten, in 270 Tagen und 5 Stunden um die Sonne, die Bahnexzentrizität beträgt somit 0,289. Seine Bahn ist mit 0,021° fast nicht gegen die Ekliptik geneigt. 2004 FH rotiert recht schnell einmal in zirka 3 Minuten um seine Achse.

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- [en] 2004 FH

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[es] 2004 FH

2004 FH es el nombre provisional de un asteroide descubierto el 16,34557 TUC de marzo de 2004 por el equipo del LINEAR, en el Lincoln Laboratory ETS, en Socorro (Nuevo México), Estados Unidos.

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[ru] 2004 FH

2004 FH — астероид, сближающийся с Землёй и Венерой.

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