| Minorplanet: | yes |
| Background: |
|
| 538 Friederike | |
| Discovered: | 18 July 1904 |
| Mpc Name: | (538) Friederike |
| Pronounced: | pronounced as /de/[1] |
| Alt Names: | 1904 OK |
| Mp Category: | Main belt (Hygiea family) |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Semimajor: | 3.1581AU |
| Perihelion: | 2.6238AU |
| Aphelion: | 3.6924abbr=onNaNabbr=on |
| Eccentricity: | 0.16919 |
| Period: | 5.61 yr (2049.9 d) |
| Inclination: | 6.5204° |
| Asc Node: | 141.173° |
| Arg Peri: | 227.779° |
| Mean Radius: | km  36 km |
| Density: | ~1.4 g/cm3 |
| Rotation: | 1.1 d  46.728abbr=onNaNabbr=on  |
| Spectral Type: | B-type asteroid  |
| Abs Magnitude: | 9.5 |
| Albedo: | 0.0641    |
| Mean Motion: | / day |
| Orbit Ref: |  [2] |
| Observation Arc: | 111.70 yr (40800 d) |
| Uncertainty: | 0 |
538 Friederike is a minor planet (an asteroid specifically) orbiting in the asteroid belt. It is a member of the Hygiea family of asteroids.
Photometric observations at the Organ Mesa Observatory in New Mexico during 2012 showed a rotation period of 46.728 ± 0.004 hours with a brightnessvariation of 0.25 ± 0.02 in magnitude.