| Minorplanet: | yes |
| Background: |
|
| Discoverer: | LONEOS |
| Discovered: | 12 May 1999 |
| Orbit Ref: | [1] |
| Epoch: | 13 January 2016 (JD 2457400.5) |
| Observation Arc: | 9167 days (25.10 yr) |
| Uncertainty: | 0 |
| Semimajor: | 0.88304AU |
| Perihelion: | 0.32425AU |
| Aphelion: | 1.44183abbr=onNaNabbr=on |
| Eccentricity: | 0.63280 |
| Inclination: | 17.05701° |
| Asc Node: | 130.21399° |
| Arg Peri: | 309.18377° |
| Moid: | 0.0487023AU |
| Jupiter Moid: | 3.86909AU |
| Period: | 0.83 yr (303.1 d) |
| Mean Motion: | 1.18778°/day |
| Mean Anomaly: | 137.83229° |
| Dimensions: | ~ (contact binary) |
| Rotation: | 7.6638abbr=onNaNabbr=on |
| Albedo: | ~0.15 |
| Spectral Type: | K (SMASS) |
| Magnitude: | ~16–18 |
| Abs Magnitude: | 17.1 |
(provisional designation ) is an Aten asteroid, near-Earth object, and potentially hazardous object in the inner Solar System that makes frequent close approaches to Earth and Venus. On the Earth approach in 2015, it was observed by the Goldstone Solar System Radar and found to be a contact binary with the largest axis approximately 2 kilometers wide, and each lobe about 200–300 meters large.[2] Although in its current orbit never passes closer than 0.047 AU to Earth, it is listed as a potentially hazardous object because it is large and might pose a threat in the future.
The asteroid is well-observed, having been observed over 2,000 times over a length of over 25 years, and was assigned a numeric designation in August 2004.[3]
On 24 July 2015 came as close as 19 lunar distances to Earth.[4] It was imaged by radar, and shown to be a contact binary, about 2 kilometers (1.2 miles) on its long axis.[4]