(7818) Muirhead Mars-crossing Asteroid
Discovered on 19 August 1990 by E. F. Helin at Palomar.
Where Muirhead is today
Seen from above the solar system on 2026-10-14: Muirhead is 1.56 au from the Sun and 0.679 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 7818 |
| Provisional designation | 1990 QO |
| Orbit class | Mars-crossing Asteroid |
| Diameter | 3.91 km (#12,978 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.297 |
| Absolute magnitude (H) | 13.97 |
| Orbital period | 3.58 years |
| Semi-major axis | 2.34 au |
| Perihelion – aphelion | 1.52 – 3.16 au |
| Eccentricity | 0.350 |
| Inclination | 21.7° |
| Closest distance between its orbit and Earth's (MOID) | 0.666 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.