(2957) Tatsuo Main-belt Asteroid
Discovered on 5 February 1934 by K. Reinmuth at Heidelberg.
Where Tatsuo is today
Seen from above the solar system on 2026-10-14: Tatsuo is 2.82 au from the Sun and 1.96 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 2957 |
| Provisional designation | 1934 CB1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 22.5 km (#1,912 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.211 |
| Rotation period | 6.82 hours |
| Spectral type | K |
| Absolute magnitude (H) | 11.0 |
| Orbital period | 5.25 years |
| Semi-major axis | 3.02 au |
| Perihelion – aphelion | 2.74 – 3.30 au |
| Eccentricity | 0.0916 |
| Inclination | 8.70° |
| Closest distance between its orbit and Earth's (MOID) | 1.74 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.