{{DEFAULTSORT:2005 GO21}}
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Convert from date to type since an undefined date is meaningless. |type=last observation: 2012-06-17; arc: 7.21 years
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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=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005GO21 |
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005GO21 |
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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=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005GO21;cad=1#cad |
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005GO21;cad=1#cad |
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Discovery[1] | |
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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 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]