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Discovery
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| Discovered by | Paul Götz |
| Discovery date | July 18, 1904 |
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Designations
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| Alternate name(s) | 1904 OK |
| Minor planet category |
Main belt (Hygiea family) |
| Epoch 18 August 2005 (JD 2453600.5) | |
| Aphelion | 550.5 Gm (3.680 AU) |
| Perihelion | 396.0 Gm (2.647 AU) |
| Semi-major axis | 473.3 Gm (3.164 AU) |
| Eccentricity | 0.163 |
| Orbital period | 2055 d (5.63 a) |
| Average orbital speed | 16.64 km/s |
| Mean anomaly | 293.642° |
| Inclination | 6.503° |
| Longitude of ascending node | 141.364° |
| Argument of perihelion | 228.385° |
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Physical characteristics
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| Dimensions | 72 km[1] |
| Mass | ~2.8×1017 kg (estimate) |
| Mean density | ~1.4 g/cm³ (estimate)[3] |
| Equatorial surface gravity | ~0.014 m/s² (estimate) |
| Escape velocity | ~0.032 km/s (estimate) |
| Rotation period | 1.1 d [2] |
| Albedo | 0.0641 [1] |
| Temperature | ~158 K max: 244K (-29° C) |
| Spectral type | B-type asteroid[4] |
| Absolute magnitude (H) | 9.30 |
538 Friederike is a minor planet orbiting the Sun.
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