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{{DISPLAYTITLE:{{mp|(308242) 2005 GO|21}}}}
{{Infobox planet
| minorplanet = yes
| background = #FFFFC0
| name = {{mp|(308242) 2005 GO|21}}
| image = [[File:2005GO21-20120617.jpg|220px]]
| caption = [[Goldstone Deep Space Communications Complex|Goldstone]] [[radar astronomy|radar]] image of asteroid {{mp|2005 GO|21}} taken 17 June 2012.
| discovery_ref = <ref name="MPEC2005-G31"/>
| discoverer = [[Siding Spring Survey]] ([[List of observatory codes#E00–E99|E12]]) 0.5-m [[Uppsala Southern Schmidt Telescope|Uppsala Schmidt]]
| discovered = 1 April 2005
| mpc_name = {{mp|(308242) 2005 GO|21}}
| mp_category = [[Aten asteroid|Aten]] [[Near-Earth object|NEO]], [[Potentially hazardous object|PHA]]<ref name="jpldata"/>
| orbit_ref = <ref name="jpldata"/>
| epoch = 13 January 2016 ([[Julian day|JD]] 2457400.5)
| aphelion = {{Convert|1.0093|AU|Gm|abbr=on|lk=on}} (Q)
| perihelion = {{Convert|0.49720|AU|Gm|abbr=on}} (q)
| semimajor = {{Convert|0.75324|AU|Gm|abbr=on}} (a)
| eccentricity = 0.33992 (e)
| period = 0.65 [[Julian year (astronomy)|yr]] (238.8 [[Julian year (astronomy)|d]])
| inclination = 24.926° (i)
| asc_node = 272.70° (Ω)
| mean_anomaly = 19.462[[Degree (angle)|°]] (M)
| arg_peri = 156.62° (ω)
| satellites = 
| dimensions = ~1.6 km<ref name="Goldstone"/>
| mass = 
| density = 
| sidereal_day = 11 hr<ref name="Goldstone"/>
| albedo = 
| spectral_type = 
| magnitude = 
| abs_magnitude = 16.5<ref name="jpldata"/>
| mean_motion = 1.5077°/day (n)
| rotation = {{Convert|11.00|h|d|abbr=on|lk=on}}
| observation_arc = 3385 days (9.27 yr)
| uncertainty = 0
| moid = {{Convert|0.0452219|AU|Gm|abbr=on}}
| jupiter_moid = {{Convert|4.25159|AU|Gm|abbr=on}}
| tisserand = 7.557
}}

'''{{mp|(308242) 2005 GO|21}}''' is a large [[Aten asteroid|Aten]] [[Near-Earth asteroid|near-Earth]] [[asteroid]] and [[potentially hazardous object]].<ref name=jpldata/> It has a well determined orbit with an observation arc of 7 years and an [[Uncertainty Parameter U|uncertainty parameter]] of 0.<ref name=jpldata/> It was discovered on 1 April 2005 by the [[Siding Spring Survey]] at an [[apparent magnitude]] of 18.1 using the {{convert|0.5|m|in|adj=on}} [[Uppsala Southern Schmidt Telescope]].<ref name="MPEC2005-G31"/>

Based on an [[Absolute magnitude#Solar System bodies (H)|absolute magnitude]] of 16.4,<ref name="jpldata"/> the asteroid has an estimated diameter of 1.6&nbsp;km (within a factor of two).<ref name=Goldstone/> {{mp|(308242) 2005 GO|21}} is the largest [[potentially hazardous asteroid]] (PHA) discovered in 2005.<ref name="jpl-search"/> On 21 June 2012 it passed Earth at a distance of {{convert|0.043963|AU|km mi|abbr=on|lk=on}}.<ref name=jpl-close/> The 2012 passage was studied with [[radar astronomy|radar]] using [[Goldstone Deep Space Communications Complex|Goldstone]] and [[Arecibo Observatory|Arecibo]].<ref name="Goldstone"/>

== References ==
{{reflist
| refs =

<ref name="MPEC2005-G31">{{cite web
 |title=MPEC 2005-G31 : 2005 GO21
 |publisher=IAU Minor Planet Center
 |date=2005-04-05
 |url=http://www.minorplanetcenter.net/mpec/K05/K05G31.html
 |accessdate=2012-06-18}} (K05G21O)</ref>

<ref name=jpldata>{{cite web
 |type=last observation: 2012-06-17; [[Observation arc|arc]]: 7.21 years
 |title=JPL Small-Body Database Browser: 308242 (2005 GO21)
 |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005GO21
 |publisher=Jet Propulsion Laboratory
 |accessdate=7 April 2016}}</ref>

<ref name="Goldstone">{{cite web
 |date=2012-06-18
 |title=(308242) 2005 GO21 Goldstone Radar Observations Planning
 |publisher=NASA/JPL Asteroid Radar Research
 |author=Dr. Lance A. M. Benner
 |url=http://echo.jpl.nasa.gov/asteroids/2005GO21/2005GO21_planning.html
 |accessdate=2012-06-18}}</ref>

<ref name="jpl-search">{{cite web
 |title=JPL Small-Body Database Search Engine: PHAs and H < 17 (mag)
 |publisher=JPL Solar System Dynamics
 |url=http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=pha;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;c1_group=OBJ;c1_item=Ai;c1_op=%3C;c1_value=17;table_format=HTML;max_rows=100;format_option=comp;c_fields=AcBhBgBjBiBnBsCkCqAi;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1&c_sort=AcA
 |accessdate=2011-11-20}}</ref>

<ref name=jpl-close>{{cite web
 |type=last observation: 2012-06-17; [[Observation arc|arc]]: 7.21 years
 |title=JPL Close-Approach Data: 308242 (2005 GO21)
 |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005GO21;cad=1#cad
 |accessdate=2012-06-18}}</ref>

}}

== External links ==
* {{JPL small body|id=308242}}

{{Minor planets navigator| |number=308242 |PageName={{mp|(308242) 2005 GO|21}} | }}
{{Small Solar System bodies}}

{{DEFAULTSORT:308242}}
[[Category:Aten asteroids]]
[[Category:Numbered minor planets|308242]]
[[Category:Discoveries by SSS]]
[[Category:Potentially hazardous asteroids]]
[[Category:Radar-imaged asteroids]]
[[Category:Near-Earth objects in 2012|20120621]]
[[Category:Astronomical objects discovered in 2005|20050401]]

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Wikidata entities used in this page

(308242) 2005 GO21: Sitelink, Title, Some statements, Miscellaneous (e.g. aliases, entity existence), Description: en
JPL Small-Body Database: Label: en

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