176 Iduna
 |
| Orbital characteristics 1 | |
|---|---|
| Orbit type | Main belt |
| Semimajor axis | 3.196 AU |
| Perihelion distance | 2.679 AU |
| Aphelion distance | 3.714 AU |
| Orbital period | 5.71 years |
| Inclination | 22.54° |
| Eccentricity | 0.162 |
| Physical characteristics 1 | |
| Diameter | 121 km |
| Rotation period | 11.289 hours |
| Spectral class 5 | G |
| Abs. magnitude | 7.90 |
| Albedo 4 | 0.083 |
| History 2 | |
| Discoverer | C. H. F. Peters, 1877 |
176 Iduna is a large main-belt asteroid. It has a composition similar to that of the largest main-belt asteroid, 1 Ceres.
It was discovered by C. H. F. Peters on October 14, 1877, in Clinton, New York. It is named after the Ydun, a club in Stockholm that hosted an astronomical conference.
An occultation of a star by Iduna was observed from Mexico on January 17, 1998.
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