(308242) 2005 GO21
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 | |
| Discovery[1] | |
|---|---|
| Discovered by |
Siding Spring Survey (E12) 0.5-m Uppsala Schmidt |
| Discovery date | 2005 April 1 |
| Designations | |
| MPC designation | (308242) 2005 GO21 |
| Minor planet category |
Aten NEO, PHA[2] |
| Orbital characteristics[2] | |
|
Epoch 2012-Mar-14 (Uncertainty=0)[2] | |
| Aphelion | 1.0095 AU (Q) |
| Perihelion | 0.49716 AU (q) |
| Semi-major axis | 0.75333 AU (a) |
| Eccentricity | 0.34005 |
| Orbital period | 0.65 yr |
| Mean anomaly | 69.001° (M) |
| Inclination | 24.915° |
| Longitude of ascending node | 272.71° |
| Argument of perihelion | 156.57° |
| Physical characteristics | |
| Dimensions | ~1.6 km[3] |
| Sidereal rotation period | 11 hr[3] |
| Absolute magnitude (H) | 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]
References
- ↑ 1.0 1.1 "MPEC 2005-G31 : 2005 GO21". IAU Minor Planet Center. 2005-04-05. Retrieved 2012-06-18. (K05G21O)
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 "JPL Small-Body Database Browser: 308242 (2005 GO21)". Jet Propulsion Laboratory. 2012-06-17 last obs (arc=7.21 years). Retrieved 2012-06-18.
- ↑ 3.0 3.1 3.2 3.3 Dr. Lance A. M. Benner (2012-06-18). "(308242) 2005 GO21 Goldstone Radar Observations Planning". NASA/JPL Asteroid Radar Research. Retrieved 2012-06-18.
- ↑ "JPL Small-Body Database Search Engine: PHAs and H < 17 (mag)". JPL Solar System Dynamics. Retrieved 2011-11-20.
- ↑ "JPL Close-Approach Data: 308242 (2005 GO21)". 2012-06-17 last obs (arc=7.21 years). Retrieved 2012-06-18.
External links
- Orbital simulation from JPL (Java) / Ephemeris
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