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{{DISPLAYTITLE:{{mp|(308242) 2005 GO|21}}}}
{{Use dmy dates|date=September 2020}}
{{Infobox planet
| minorplanet = yes
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| name = {{mp|(308242) 2005 GO|21}}
| image = 2005GO21-20120617.jpg
|
| caption = [[Goldstone Deep Space Communications Complex|Goldstone]] [[radar astronomy|radar]] image of asteroid {{mp|2005 GO|21}}<br />taken on 17 June 2012
| discovery_ref = <ref name="MPEC2005-G31"/>
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| arg_peri = 156.62°
| moid = {{Convert|0.0452219|AU|Gm|abbr=on}}
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| rotation = {{val|11.00
| albedo =
| spectral_type =
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== External links ==
* {{NeoDys|308242}}
* {{ESA-SSA|308242|2005GO21}}
* {{JPL small body|id=308242}}
{{Minor planets navigator| |number=308242 |PageName={{mp|(308242) 2005 GO|21}} | }}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:
[[Category:Aten asteroids|308242]]
[[Category:Discoveries by SSS|308242]]
[[Category:Potentially hazardous asteroids|308242]]
[[Category:Radar-imaged asteroids|308242]]
[[Category:Near-Earth objects in 2012|20120621]]
[[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 | |
~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]