| Minorplanet: | yes |
| Background: |
|
| Discoverer: | Siding Spring Srvy. |
| Discovery Site: | Siding Spring Obs. |
| Discovered: | 1 April 2005 |
| Mp Category: | AtenNEOPHA |
| Epoch: | 13 January 2016 (JD 2457400.5) |
| Uncertainty: | 0 |
| Observation Arc: | 3385 days (9.27 yr) |
| Aphelion: | 1.0093abbr=onNaNabbr=on |
| Perihelion: | 0.4972AU |
| Semimajor: | 0.75324AU |
| Eccentricity: | 0.33992 |
| Period: | 0.65 yr (238.8 d) |
| Inclination: | 24.926° |
| Asc Node: | 272.70° |
| Mean Anomaly: | 19.462° |
| Mean Motion: | 1.5077°/day |
| Arg Peri: | 156.62° |
| Moid: | 0.0452219AU |
| Mean Diameter: | ~1.6 km |
| Abs Magnitude: | 16.5 |
is a large Aten near-Earth asteroid and potentially hazardous object. It has a well determined orbit with an observation arc of 7 years and an uncertainty parameter of 0. It was discovered on 1 April 2005 by the Siding Spring Survey at an apparent magnitude of 18.1 using the 0.5m (01.6feet) Uppsala Southern Schmidt Telescope.
Based on an absolute magnitude of 16.4, the asteroid has an estimated diameter of 1.6 km (within a factor of two). is the largest potentially hazardous asteroid (PHA) discovered in 2005. On 21 June 2012 it passed Earth at a distance of 0.043963abbr=onNaNabbr=on. The 2012 passage was studied with radar using Goldstone and Arecibo.