(2638) Gadolin Main-belt Asteroid
Discovered on 19 September 1939 by Y. Vaisala at Turku.
Where Gadolin is today
Seen from above the solar system on 2026-10-14: Gadolin is 2.50 au from the Sun and 3.08 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 2638 |
| Provisional designation | 1939 SG |
| Orbit class | Main-belt Asteroid |
| Diameter | 12.1 km (#4,037 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.284 |
| Rotation period | 7.22 hours |
| Absolute magnitude (H) | 12.12 |
| Orbital period | 4.09 years |
| Semi-major axis | 2.56 au |
| Perihelion – aphelion | 2.35 – 2.76 au |
| Eccentricity | 0.0820 |
| Inclination | 14.3° |
| Closest distance between its orbit and Earth's (MOID) | 1.36 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.