(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]
| |
| 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] | |
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]
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