| b>176 Iduna |
| bgcolor="#ffc0c0" colspan="2" | Orbital characteristics 1 |
| a href="/encyclopedia/Orbit" title="Orbit">Orbit type | Main belt |
| a href="/encyclopedia/Semimajor-axis" title="Semimajor axis">Semimajor axis | 3.196 AU |
| a href="/encyclopedia/Perihelion" title="Perihelion">Perihelion distance | 2.679 AU |
| a href="/encyclopedia/Aphelion" title="Aphelion">Aphelion distance | 3.714 AU |
| a href="/encyclopedia/Orbital-period" title="Orbital period">Orbital period | 5.71 years |
| a href="/encyclopedia/Inclination" title="Inclination">Inclination | 22.54° |
| a href="/encyclopedia/Eccentricity" title="Eccentricity">Eccentricity | 0.162 |
| bgcolor="#ffc0c0" colspan="2" | Physical characteristics 1 |
| a href="/encyclopedia/Diameter" title="Diameter">Diameter | 121 km |
| a href="/encyclopedia/Rotation-period" title="Rotation period">Rotation period | 11.289 hours |
| a href="/encyclopedia/Spectral-class" title="Spectral class">Spectral class 5 | G |
| a href="/encyclopedia/Absolute-magnitude" title="Absolute magnitude">Abs. magnitude | 7.90 |
| a href="/encyclopedia/Albedo" title="Albedo">Albedo 4 | 0.083 |
| bgcolor="#ffc0c0" colspan="2" | History 2 |
| iscoverer | C. H. F. Peters, 1877 |