77 Frigga
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Discovery
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| Discovered by | Christian Heinrich Friedrich Peters |
| Discovery date | November 12, 1862 |
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Designations
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| Named after | Frigg |
| Alternate name(s) | |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 452.196 Gm (3.023 AU) |
| Perihelion | 346.228 Gm (2.314 AU) |
| Semi-major axis | 399.212 Gm (2.669 AU) |
| Eccentricity | 0.133 |
| Orbital period | 1592.266 d (4.36 a) |
| Average orbital speed | 18.15 km/s |
| Mean anomaly | 346.682° |
| Inclination | 2.433° |
| Longitude of ascending node | 1.332° |
| Argument of perihelion | 61.419° |
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Physical characteristics
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| Dimensions | 69.2 km[1] |
| Mass | 3.5×1017 kg (assumed) |
| Mean density | ? g/cm³ |
| Equatorial surface gravity | 0.0193 m/s² |
| Escape velocity | 0.0366 km/s |
| Rotation period | 9.0 hr[1] |
| Albedo | 0.144[1][2] |
| Temperature | ~170 K |
| Spectral type | M |
| Absolute magnitude (H) | 8.52[1] |
77 Frigga (
/ˈfrɪɡə/ frig-ə) is a large, M-type, possibly metallic main-belt asteroid. It was discovered by C. H. F. Peters on November 12, 1862. It is named after Frigg, the Norse goddess.
Frigga has been studied by radar.[3]
[edit] References
- ^ a b c d "JPL Small-Body Database Browser: 77 Frigga". Jet Propulsion Laboratory. 2012-01-04 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=77. Retrieved 2012-01-27.
- ^ Asteroid Data Sets
- ^ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. http://echo.jpl.nasa.gov/asteroids/. Retrieved 2012-01-27.
[edit] External links
- Orbital simulation from JPL (Java) / Ephemeris
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