(4039) Souseki Main-belt Asteroid
Discovered on 17 September 1987 by T. Seki at Geisei.
Where Souseki is today
Seen from above the solar system on 2026-10-14: Souseki is 2.46 au from the Sun and 3.21 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 4039 |
| Provisional designation | 1987 SH |
| Orbit class | Main-belt Asteroid |
| Diameter | 6.63 km (#8,075 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.473 |
| Rotation period | 2.77 hours |
| Spectral type | S |
| Absolute magnitude (H) | 12.9 |
| Orbital period | 3.76 years |
| Semi-major axis | 2.42 au |
| Perihelion – aphelion | 2.27 – 2.57 au |
| Eccentricity | 0.0613 |
| Inclination | 5.04° |
| Closest distance between its orbit and Earth's (MOID) | 1.28 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.