(6987) Onioshidashi Main-belt Asteroid
Discovered on 25 November 1994 by T. Kobayashi at Oizumi.
Onioshidashi is a lava plateau formed by the lava flow of the 1783 eruption of Mt. Asamayama. The gigantic, dark lava spread, 3 km by 12 km and 30 m thick, makes a chilling and unearthly scene.Naming citation (20030106/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Onioshidashi is today
Seen from above the solar system on 2026-10-14: Onioshidashi is 2.90 au from the Sun and 1.91 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 6987 |
| Provisional designation | 1994 WZ |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.72 km (#9,348 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.135 |
| Rotation period | 35.7 hours |
| Absolute magnitude (H) | 13.84 |
| Orbital period | 4.66 years |
| Semi-major axis | 2.79 au |
| Perihelion – aphelion | 2.65 – 2.93 au |
| Eccentricity | 0.0492 |
| Inclination | 2.96° |
| Closest distance between its orbit and Earth's (MOID) | 1.64 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.