(979) Ilsewa Main-belt Asteroid
Discovered on 29 June 1922 by K. Reinmuth at Heidelberg.
Where Ilsewa is today
Seen from above the solar system on 2026-10-14: Ilsewa is 3.60 au from the Sun and 4.41 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 979 |
| Provisional designation | A922 MA |
| Orbit class | Main-belt Asteroid |
| Diameter | 35.7 km (#1,120 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.166 |
| Rotation period | 42.6 hours |
| Absolute magnitude (H) | 9.82 |
| Orbital period | 5.61 years |
| Semi-major axis | 3.16 au |
| Perihelion – aphelion | 2.71 – 3.61 au |
| Eccentricity | 0.142 |
| Inclination | 10.1° |
| Closest distance between its orbit and Earth's (MOID) | 1.72 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.