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{{DISPLAYTITLE:{{mp|(308242) 2005 GO|21}}}} |
{{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 |
| minorplanet = yes |
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| name = {{mp|(308242) 2005 GO|21}} |
| name = {{mp|(308242) 2005 GO|21}} |
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| image = 2005GO21-20120617.jpg |
| 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 |
| 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_ref = <ref name="MPEC2005-G31"/> |
| discovery_ref = <ref name="MPEC2005-G31"/> |
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| arg_peri = 156.62° |
| arg_peri = 156.62° |
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| moid = {{Convert|0.0452219|AU|Gm|abbr=on}} |
| moid = {{Convert|0.0452219|AU|Gm|abbr=on}} |
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| mean_diameter = ~1.6 km<ref name="Goldstone"/> |
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| rotation = {{val|11.00 |
| 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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== External links == |
== External links == |
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* {{NeoDys|308242}} |
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* {{ESA-SSA|308242|2005GO21}} |
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* {{JPL small body|id=308242}} |
* {{JPL small body|id=308242}} |
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{{Minor planets navigator| |number=308242 |PageName={{mp|(308242) 2005 GO|21}} | }} |
{{Minor planets navigator| |number=308242 |PageName={{mp|(308242) 2005 GO|21}} | }} |
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{{Small Solar System bodies}} |
{{Small Solar System bodies}} |
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{{Authority control}} |
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{{DEFAULTSORT: |
{{DEFAULTSORT:2005 GO21}} |
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[[Category:Aten asteroids]] |
[[Category:Aten asteroids|308242]] |
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[[Category:Discoveries by SSS]] |
[[Category:Discoveries by SSS|308242]] |
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[[Category:Potentially hazardous asteroids]] |
[[Category:Potentially hazardous asteroids|308242]] |
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[[Category:Radar-imaged asteroids]] |
[[Category:Radar-imaged asteroids|308242]] |
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[[Category:Near-Earth objects in 2012|20120621]] |
[[Category:Near-Earth objects in 2012|20120621]] |
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[[Category:Astronomical objects discovered in 2005|20050401]] |
[[Category:Astronomical objects discovered in 2005|20050401]] |
![]() | |
Discovery[1] | |
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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]