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| discoverer = [[Siding Spring Survey]] ([[List of observatory codes#E00–E99|E12]])<br>0.5-m [[Uppsala Southern Schmidt Telescope|Uppsala Schmidt]] |
| discoverer = [[Siding Spring Survey]] ([[List of observatory codes#E00–E99|E12]])<br>0.5-m [[Uppsala Southern Schmidt Telescope|Uppsala Schmidt]] |
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| discovered = 1 April 2005 |
| discovered = 1 April 2005 |
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| mpc_name = {{mp|(308242) 2005 GO|21}} |
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| mp_category = [[Aten asteroid|Aten]] [[Near-Earth object|NEO]],<br>[[Potentially hazardous object|PHA]]<ref name="jpldata"/> |
| mp_category = [[Aten asteroid|Aten]] [[Near-Earth object|NEO]],<br>[[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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| Discovery[1] | |
|---|---|
| Discovered by | Siding Spring Survey (E12) 0.5-m Uppsala Schmidt |
| 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) (Q) |
| Perihelion | 0.49720 AU (74.380 Gm) (q) |
| 0.75324 AU (112.683 Gm) (a) | |
| Eccentricity | 0.33992 (e) |
| 0.65 yr (238.8 d) | |
| 19.462° (M) | |
| 1.5077°/day (n) | |
| Inclination | 24.926° (i) |
| 272.70° (Ω) | |
| 156.62° (ω) | |
| Earth MOID | 0.0452219 AU (6.76510 Gm) |
| Jupiter MOID | 4.25159 AU (636.029 Gm) |
| TJupiter | 7.557 |
| Physical characteristics | |
| Dimensions | ~1.6 km[3] |
| 11.00 h (0.458 d) | |
| 11 hr[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]
