2004 FH

Template:Short description Template:Use dmy dates {{#invoke:infobox|infoboxTemplate | class = vcard | titleclass = fn org | title = 2004 FH | image = {{#invoke:InfoboxImage|InfoboxImage|image=Asteroid 2004 FH.gif|upright={{#if:||1.1}}|alt=}} | caption = Flyby of asteroid Template:Mp;Template:Efn the object that flashes by is a man-made satellite. | headerstyle = {{#if:#FFC2E0|background-color:#FFC2E0|background-color:#E0CCFF}}; color:inherit; | labelstyle = max-width:{{#if:||11em}}; | autoheaders = y

| header1 = Discovery<ref name="jpldata"/><ref name="MPC-object"/>

| label2 = Discovered by | data2 = LINEAR | label3 = Discovery site | data3 = Lincoln Lab's ETS | label4 = Discovery date | data4 = 16 March 2004 | label5 = Template:Longitem | data5 =

| header10 = {{#if:|Designations|Designations}}

| label11 = Template:Longitem | data11 = 2004 FH | label12 = Pronunciation | data12 = | label13 = Template:Longitem | data13 = | label14 = Template:Longitem | data14 = 2004 FH | label15 = Template:Longitem | data15 = NEOTemplate:·Aten<ref name="jpldata"/> | label16 = Adjectives | data16 = | label17 = Symbol | data17 =

| header20 = Orbital characteristics{{#ifeq:|yes| (barycentric)}}<ref name="jpldata"/>

| data21 = | data22 = {{#if:21 Nov 2025 (JD 2461000.5) |Epoch 21 Nov 2025 (JD 2461000.5)}} | data23 = {{#if:1 | Uncertainty parameter 1}} | label24 = Observation arc | data24 = 6184 days (16.93 years) | label25 = Earliest precovery date | data25 = | label26 = {{#switch:{{{apsis}}} |apsis|gee|barion|center|centre|(apsis)=Apo{{{apsis}}} |Ap{{#if:|{{{apsis}}}|helion}}}} | data26 = 1.0559 AU | label27 = Peri{{#if:|{{{apsis}}}|helion}} | data27 = 0.5826 AU | label28 = Peri{{#if:|{{{apsis}}}|apsis}} | data28 = | label29 = {{#switch:{{{apsis}}} |helion|astron=Ap{{{apsis}}} |Apo{{#if:|{{{apsis}}}|apsis}}}} | data29 = | label30 = Periastron | data30 = | label31 = Apoastron | data31 = | label32 = Template:Longitem | data32 = 0.8193 AU | label33 = Template:Longitem | data33 = | label34 = Eccentricity | data34 = 0.2888 | label35 = Template:Longitem | data35 = 0.7415 yr (270.84 days) | label36 = Template:Longitem | data36 = | label37 = Template:Longitem | data37 = | label38 = Template:Longitem | data38 = 333.74° | label39 = Template:Longitem | data39 = Template:Deg2DMS / day | label40 = Inclination | data40 = 0.0549° | label41 = Template:Longitem | data41 = | label42 = Template:Longitem | data42 = 258.20° | label43 = Template:Longitem | data43 = | label44 = Template:Longitem | data44 = | label45 = Template:Longitem | data45 = 69.180° | label46 = Template:Nowrap | data46 = | label47 = Satellite of | data47 = | label48 = Group | data48 = | label49 = {{#switch: |yes|true=Satellites |Known satellites}} | data49 = | label50 = Star | data50 = | label51 = Earth MOID | data51 = 0.000484 AU | label52 = Mercury MOID | data52 = | label53 = Venus MOID | data53 = | label54 = Mars MOID | data54 = | label55 = Jupiter MOID | data55 = | label56 = Saturn MOID | data56 = | label57 = Uranus MOID | data57 = | label58 = Neptune MOID | data58 = | label59 = T_Jupiter | data59 =

| header60 = Proper orbital elements

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({{#expr:365.25*360/1 round 3}} d) }} | label66 = Template:Longitem | data66 = {{#if:|{{{perihelion_rate}}} arcsecTemplate:\yr }} | label67 = Template:Longitem | data67 = {{#if:|{{{node_rate}}} arcsecTemplate:\yr}}

| header70 = Template:Anchor{{#if:yes| Physical characteristics|Physical characteristics}}

| label71 = Dimensions | data71 = 24 m Template:Small<ref name="lcdb"/>
30 m Template:Small<ref name="news142"/> | label72 = Template:Longitem | data72 = | label73 = Template:Longitem | data73 = | label74 = Template:Longitem | data74 = | label75 = Template:Longitem | data75 = | label76 = Flattening | data76 = | label77 = Circumference | data77 = | label78 = Template:Longitem | data78 = | label79 = Volume | data79 = | label80 = Mass | data80 = | label81 = Template:Longitem | data81 = | label82 = Template:Longitem | data82 = | label83 = Template:Longitem | data83 = | label84 = Template:Longitem | data84 = | label85 = Template:Longitem | data85 = Template:Cvt<ref name="lcdb"/> | label86 = Template:Longitem | data86 = | label87 = Template:Longitem | data87 = | label88 = Template:Longitem | data88 = | label89 = Template:Longitem | data89 = | label90 = Template:Longitem | data90 = | label91 = Template:Longitem | data91 = | label92 = Template:Longitem | data92 = | label93 = {{#if:yes |Template:Longitem |Albedo}} | data93 = 0.20 Template:Small<ref name="lcdb"/> | label94 = Temperature | data94 =

| data100 = {{#if:|

{{#if:|}}{{#if:|}}{{#if:|}}{{#if:|}}

Surface temp.	min	mean	max
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| label101 = Surface absorbed dose rate | data101 = | label102 = Surface equivalent dose rate | data102 = | label103 = Template:Longitem | data103 = S Template:Small<ref name="lcdb"/> | label104 = Template:Longitem | data104 = | label105 = Template:Longitem | data105 = | label106 = Template:Longitem | data106 = 25.7<ref name="jpldata"/> | label107 = Template:Longitem | data107 =

| header110 = Atmosphere

| label111 = Template:Longitem | data111 = | label112 = Template:Longitem | data112 = | label113 = Composition by volume | data113 =

| below = {{#if:||Template:Reflist }}

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2004 FH is a micro-asteroid and near-Earth object of the Aten group, approximately 30 meters in diameter, that passed just Template:Convert above the Earth's surface on 18 March 2004, at 22:08 UTC. It was the 11th-closest approach to Earth recorded Template:As of.Template:Efn 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.<ref name="MPC-object"/>

Orbit and classification

File:2004fs56992main 2004.jpg

Trajectory of Template:Mp in the Earth–Moon system

Template:Mp 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.Template:Citation needed

On 17 March 2044 the asteroid will pass no closer than Template:Convert from the Earth.<ref name=jpl-close/> Template:Mp also has the distinction of having the lowest inclination of any known near-Earth asteroids.

Two weeks later another asteroid approached even closer, Template:Mpl, which was smaller; and a few years later Template:Mpl, which was closer in size, passed by at similar distance.

Physical characteristics

Template:Mp is an assumed stony S-type asteroid.<ref name="lcdb"/>

Rotation period

In March 2004, two rotational lightcurves of Template:Mp 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 (Template:Small).<ref name="lcdb"/><ref name="geneva-obs"/>

This makes this object a fast rotator, currently among the Top 100 known to exist. The photometric observations also revealed, that Template:Mp is a tumbler with a non-principal axis rotation.<ref name="lcdb"/>

Diameter and albedo

has been estimated to measure approximately Template:Convert in diameter.<ref name="news142"/> 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.<ref name="lcdb"/>

External links

• MPEC 2004-F24
• Images of 2004 FH at Klet
• Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Template:NeoDys
• Template:ESA-SSA
• Template:JPL small body

Template:Authority control