1993 HD
| Orbital characteristics | |
|---|---|
| Perihelion | 0.5 ± 2 AU (q) |
| Physical characteristics | |
| Dimensions | ~25–60 m (82–197 ft) |
| 25.1[1] | |
|
| |
1993 HD is a lost asteroid that could be an apollo asteroid[1] or an amor asteroid.[2] The asteroid is lost because it only has a 1-day observation arc and the orbit is very poorly constrained.[1]
As of November 2014, there are 583 near-Earth objects with less than a 2-day observation arc.[3]