538 Friederike
| Discovery | |
|---|---|
| Discovered by | Paul Götz |
| Discovery date | 18 July 1904 |
| Designations | |
| MPC designation | (538) Friederike |
| 1904 OK | |
| Main belt (Hygiea family) | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 111.70 yr (40800 d) |
| Aphelion | 3.6924 AU (552.38 Gm) |
| Perihelion | 2.6238 AU (392.51 Gm) |
| 3.1581 AU (472.45 Gm) | |
| Eccentricity | 0.16919 |
| 5.61 yr (2049.9 d) | |
|
Average orbital speed
|
16.64 km/s |
| 275.237° | |
| 0° 10m 32.232s / day | |
| Inclination | 6.5204° |
| 141.173° | |
| 227.779° | |
| Earth MOID | 1.62697 AU (243.391 Gm) |
| Jupiter MOID | 1.77775 AU (265.948 Gm) |
| Jupiter Tisserand parameter | 3.173 |
| Physical characteristics | |
|
Mean radius
|
36.245±1.15 km 36 km |
| Mass | ~2.8×1017 kg (estimate) |
|
Mean density
|
~1.4 g/cm³ (estimate) |
|
Equatorial surface gravity
|
~0.014 m/s² (estimate) |
|
Equatorial escape velocity
|
~0.032 km/s (estimate) |
| 1.1 d 46.728 h (1.9470 d) |
|
| 0.0641 0.0641±0.004 |
|
| Temperature | ~158 K max: 244K (-29° C) |
| B-type asteroid | |
| 9.5 | |
538 Friederike is a minor planet orbiting the Sun.
Photometric observations at the Organ Mesa Observatory in New Mexico during 2012 showed a rotation period of 46.728 ± 0.004 hours with a brightness variation of 0.25 ± 0.02 in magnitude.
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