(5) Astraea Main-belt Asteroid
Discovered on 8 December 1845 by K. L. Hencke at Driesen.
👶 Astraea as a baby name🐶 Astraea as a dog name
Where Astraea is today
Seen from above the solar system on 2026-10-14: Astraea is 3.01 au from the Sun and 2.30 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 5 |
| Provisional designation | A845 XA |
| Orbit class | Main-belt Asteroid |
| Diameter | 107 km (#211 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.274 |
| Rotation period | 16.8 hours |
| Spectral type | S |
| Absolute magnitude (H) | 6.95 |
| Orbital period | 4.14 years |
| Semi-major axis | 2.58 au |
| Perihelion – aphelion | 2.09 – 3.06 au |
| Eccentricity | 0.188 |
| Inclination | 5.36° |
| Closest distance between its orbit and Earth's (MOID) | 1.11 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.