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2005 GO21 is the largest potentially hazardous asteroids (PHA) discovered in 2005.
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{{DISPLAYTITLE:(308242) 2005 GO |
{{DISPLAYTITLE:{{mp|(308242) 2005 GO|21}}}} |
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{{Use dmy dates|date=September 2020}} |
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{{Infobox planet |
{{Infobox planet |
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| minorplanet = yes |
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| background = #FFC2E0 |
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| name = {{mp|(308242) 2005 GO|21}} |
| name = {{mp|(308242) 2005 GO|21}} |
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| image = |
| image = 2005GO21-20120617.jpg |
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| image_scale = |
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| caption = [[Goldstone Deep Space Communications Complex|Goldstone]] [[radar astronomy|radar]] image of asteroid {{mp|2005 GO|21}}<br />taken on 17 June 2012 |
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| discovery = yes |
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| discovery_ref = <ref name="MPEC2005-G31"/> |
| discovery_ref = <ref name="MPEC2005-G31"/> |
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| discoverer = [[Siding Spring Survey |
| discoverer = [[Siding Spring Survey|Siding Spring Srvy.]] |
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| discovery_site = [[Siding Spring Observatory|Siding Spring Obs.]] |
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| discovered = |
| discovered = 1 April 2005 |
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| mpc_name = {{mp|(308242) 2005 GO|21}} |
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| mp_category = [[Aten asteroid|Aten]] |
| mp_category = [[Aten asteroid|Aten]]{{·}}[[Near-Earth object|NEO]]{{·}}[[Potentially hazardous object|PHA]]<ref name="jpldata"/> |
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| orbit_ref = <ref name="jpldata"/> |
| orbit_ref = <ref name="jpldata"/> |
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| epoch = |
| epoch = 13 January 2016 ([[Julian day|JD]] 2457400.5) |
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| uncertainty = 0 |
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| aphelion = 1.0095 [[Astronomical unit|AU]] (Q) |
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| observation_arc = 3385 days (9.27 yr) |
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| aphelion = {{Convert|1.0093|AU|Gm|abbr=on|lk=on}} |
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| semimajor = 0.75333 AU (a) |
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| perihelion = {{Convert|0.49720|AU|Gm|abbr=on}} |
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| ⚫ | |||
| semimajor = {{Convert|0.75324|AU|Gm|abbr=on}} |
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| ⚫ | |||
| ⚫ | |||
| ⚫ | |||
| ⚫ | | period = 0.65 [[Julian year (astronomy)|yr]] (238.8 [[Julian year (astronomy)|d]]) |
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| asc_node = 272.71° |
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| inclination = 24.926° |
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| asc_node = 272.70° |
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| ⚫ | |||
| satellites = |
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| mean_motion = 1.5077°/day |
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| physical_characteristics = yes |
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| arg_peri = 156.62° |
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| ⚫ | |||
| moid = {{Convert|0.0452219|AU|Gm|abbr=on}} |
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| mass = |
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| ⚫ | |||
| density = |
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| rotation = {{val|11.00|ul=h}}<ref name="jpldata"/><ref name="Goldstone"/> |
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| albedo = |
| albedo = |
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| spectral_type = |
| spectral_type = |
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| magnitude = |
| magnitude = |
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| abs_magnitude = 16. |
| abs_magnitude = 16.5<ref name="jpldata"/> |
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}} |
}} |
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'''{{mp|(308242) 2005 GO|21}}''' is a large [[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"/> |
'''{{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"/> |
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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 km (within a factor of two).<ref name=Goldstone/> {{mp|2005 GO|21}} is the largest [[potentially hazardous asteroid]] |
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 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"/> |
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== References == |
== References == |
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{{reflist |
{{reflist|refs= |
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| refs = |
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<ref name="MPEC2005-G31">{{cite web |
<ref name="MPEC2005-G31">{{cite web |
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|title=MPEC 2005-G31 : 2005 GO21 |
|title=MPEC 2005-G31 : 2005 GO21 |
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|publisher=IAU Minor Planet Center |
|publisher=[[IAU Minor Planet Center]] |
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|date=2005-04-05 |
|date=2005-04-05 |
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|url= |
|url=https://www.minorplanetcenter.net/mpec/K05/K05G31.html |
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|accessdate=2012-06-18}} (K05G21O)</ref> |
|accessdate=2012-06-18}} (K05G21O)</ref> |
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<ref name=jpldata>{{cite web |
<ref name=jpldata>{{cite web |
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|type=last observation: 2012-06-17; [[Observation arc|arc]]: 7.21 years |
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|title=JPL Small-Body Database Browser: 308242 (2005 GO21) |
|title=JPL Small-Body Database Browser: 308242 (2005 GO21) |
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|url= |
|url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005GO21 |
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|publisher=Jet Propulsion Laboratory |
|publisher=[[Jet Propulsion Laboratory]] |
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|accessdate= |
|accessdate=7 April 2016}}</ref> |
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<ref name="Goldstone">{{cite web |
<ref name="Goldstone">{{cite web |
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<ref name=jpl-close>{{cite web |
<ref name=jpl-close>{{cite web |
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|type=last observation: 2012-06-17; [[Observation arc|arc]]: 7.21 years |
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|title=JPL Close-Approach Data: 308242 (2005 GO21) |
|title=JPL Close-Approach Data: 308242 (2005 GO21) |
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|url= |
|url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005GO21;cad=1#cad |
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|accessdate=2012-06-18}}</ref> |
|accessdate=2012-06-18}}</ref> |
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}} <!-- end of reflist --> |
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}} |
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== External links == |
== External links == |
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* {{NeoDys|308242}} |
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* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005GO21;orb=1 Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2005GO21 Ephemeris] |
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* {{ESA-SSA|308242|2005GO21}} |
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* {{JPL small body|id=308242}} |
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{{Minor planets navigator| |number=308242 |PageName={{mp|(308242) 2005 GO|21}} | }} |
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{{Small Solar System bodies}} |
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{{Authority control}} |
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{{DEFAULTSORT:2005 GO21}} |
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| ⚫ | |||
[[Category: |
[[Category:Aten asteroids|308242]] |
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[[Category: |
[[Category:Discoveries by SSS|308242]] |
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[[Category:Potentially hazardous asteroids|308242]] |
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| ⚫ | |||
[[Category:Near-Earth objects in 2012|20120621]] |
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[[Category:Astronomical objects discovered in 2005|20050401]] |
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| Discovery[1] | |
|---|---|
| Discovered by | Siding Spring Srvy. |
| Discovery site | Siding Spring Obs. |
| Discovery date | 1 April 2005 |
| Designations | |
| (308242) 2005 GO21 | |
| Aten · NEO · PHA[2] | |
| Orbital characteristics[2] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 3385 days (9.27 yr) |
| Aphelion | 1.0093 AU (150.99 Gm) |
| Perihelion | 0.49720 AU (74.380 Gm) |
| 0.75324 AU (112.683 Gm) | |
| Eccentricity | 0.33992 |
| 0.65 yr (238.8 d) | |
| 19.462° | |
| 1.5077°/day | |
| Inclination | 24.926° |
| 272.70° | |
| 156.62° | |
| Earth MOID | 0.0452219 AU (6.76510 Gm) |
| Physical characteristics | |
Mean diameter | ~1.6 km[3] |
| 11.00 h[2][3] | |
| 16.5[2] | |
(308242) 2005 GO21 is a large Aten near-Earth asteroid and potentially hazardous object.[2] It has a well determined orbit with an observation arc of 7 years and an uncertainty parameter of 0.[2] It was discovered on 1 April 2005 by the Siding Spring Survey at an apparent magnitude of 18.1 using the 0.5-metre (20 in) Uppsala Southern Schmidt Telescope.[1]
Based on an absolute magnitude of 16.4,[2] the asteroid has an estimated diameter of 1.6 km (within a factor of two).[3] (308242) 2005 GO21 is the largest potentially hazardous asteroid (PHA) discovered in 2005.[4] On 21 June 2012 it passed Earth at a distance of 0.043963 AU (6,576,800 km; 4,086,600 mi).[5] The 2012 passage was studied with radar using Goldstone and Arecibo.[3]
