(18349) Dafydd Main-belt Asteroid
Discovered on 25 July 1990 by H. E. Holt at Palomar.
Dafydd (c. 1215-1246) succeeded his father Llywelyn I as prince of Wales in 1240. In a charter issued 750 years to the day before this minor planet was discovered, he revised and improved Welsh law and made other advancements. He was also responsible for establishing diplomatic links between Wales and the papacy.Naming citation (20090209/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Dafydd is today
Seen from above the solar system on 2026-10-14: Dafydd is 3.19 au from the Sun and 3.48 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 18349 |
| Provisional designation | 1990 OV4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 10.8 km (#4,694 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0610 |
| Rotation period | 13.6 hours |
| Absolute magnitude (H) | 13.77 |
| Orbital period | 4.92 years |
| Semi-major axis | 2.89 au |
| Perihelion – aphelion | 2.23 – 3.55 au |
| Eccentricity | 0.228 |
| Inclination | 16.4° |
| Closest distance between its orbit and Earth's (MOID) | 1.28 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.