(7174) Semois Outer Main-belt Asteroid
Discovered on 18 September 1988 by H. Debehogne at La Silla.
The Semois, a river in Wallonia, rises near the city of Arlon, Luxembourg. It flows from the Ardennes to the river Meuse.Naming citation (20081113/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Semois is today
Seen from above the solar system on 2026-10-14: Semois is 3.47 au from the Sun and 4.31 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 7174 |
| Provisional designation | 1988 SQ |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 25.5 km (#1,652 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0740 |
| Rotation period | 7.46 hours |
| Absolute magnitude (H) | 11.72 |
| Orbital period | 8.00 years |
| Semi-major axis | 4.00 au |
| Perihelion – aphelion | 3.30 – 4.70 au |
| Eccentricity | 0.175 |
| Inclination | 12.6° |
| Closest distance between its orbit and Earth's (MOID) | 2.31 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.