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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 [[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]] (PHA) discovered in 2005.<ref name="jpl-search"/> On 21 June 2012 it will pass Earth at a distance of {{convert|0.043963|AU|km mi|abbr=on|lk=on}}.<ref name=jpl-close/> |
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]] (PHA) discovered in 2005.<ref name="jpl-search"/> On 21 June 2012 it will pass Earth at a distance of {{convert|0.043963|AU|km mi|abbr=on|lk=on}}.<ref name=jpl-close/> The 2012 passage will be studied with 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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| Discovery[1] | |
|---|---|
| Discovered by | Siding Spring Survey (E12) 0.5-m Uppsala Schmidt |
| Discovery date | 2005 April 1 |
| Designations | |
Designation | (308242) 2005 GO21 |
| Aten NEO, PHA[2] | |
| Orbital characteristics[2] | |
| Epoch 2012-Mar-14 (Uncertainty=0)[2] | |
| Aphelion | 1.0095 AU (Q) |
| Perihelion | 0.49716 AU (q) |
| 0.75333 AU (a) | |
| Eccentricity | 0.34005 |
| 0.65 yr | |
| 69.001° (M) | |
| Inclination | 24.915° |
| 272.71° | |
| 156.57° | |
| Physical characteristics | |
| Dimensions | ~1.6 km[3] |
| 11 hr[3] | |
| 16.4[2] | |
(308242) 2005 GO21 is a large 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] 2005 GO21 is the largest potentially hazardous asteroid (PHA) discovered in 2005.[4] On 21 June 2012 it will pass Earth at a distance of 0.043963 AU (6,576,800 km; 4,086,600 mi).[5] The 2012 passage will be studied with radar using Goldstone and Arecibo.[3]
{{cite web}}: Check date values in: |date= (help)
{{cite web}}: Check date values in: |date= (help)
