538 Friederike
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| Discovery A | |
|---|---|
| Discoverer | Paul Götz |
| Discovery date | July 18, 1904 |
| Alternate designations B |
1904 OK |
| Category | Main belt (Hygiea family) |
| Orbital elements C | |
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| Eccentricity (e) | 0.163 |
| Semi-major axis (a) | 473.3 Gm (3.164 AU) |
| Perihelion (q) | 396.0 Gm (2.647 AU) |
| Aphelion (Q) | 550.5 Gm (3.680 AU) |
| Orbital period (P) | 2055 d (5.63 a) |
| Mean orbital speed | 16.64 km/s |
| Inclination (i) | 6.503° |
| Longitude of the ascending node (Ω) |
141.364° |
| Argument of perihelion (ω) |
228.385° |
| Mean anomaly (M) | 293.642° |
| Physical characteristics D | |
| Dimensions | 72 km[1] |
| Mass | ~2.8×1017 kg (estimate) |
| Density | ~1.4 g/cm³ (estimate)[3] |
| Surface gravity | ~0.014 m/s² (estimate) |
| Escape velocity | ~0.032 km/s (estimate) |
| Rotation period | 1.1 d [2] |
| Spectral class | B-type asteroid[4] |
| Absolute magnitude | 9.30 |
| Albedo (geometric) | 0.0641 [1] |
| Mean surface temperature |
~158 K max: 244K (-29° C) |
538 Friederike is a minor planet orbiting the Sun.
[edit] References
- PDS lightcurve data
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G. A. Krasinsky et al Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002).
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T. Mothé-Diniz et al Rotationally Resolved Spectra of 10 Hygiea and a Spectroscopic Study of the Hygiea Family, Icarus, Vol. 152, p. 117 (2001).
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