77 Frigga

77 Frigga

Discovery
Discovered by	Christian Heinrich Friedrich Peters
Discovery date	November 12, 1862
Designations
Named after	Frigg
Alternative names
Minor planet category	Main belt
Orbital characteristics
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°
Physical characteristics
Dimensions	69.2 km[1]
Mass	(1.74 ± 0.68) × 10^18 kg[2]
Mean density	11.05 ± 4.34[2] g/cm^3
Surface gravity	0.0193 m/s²
Escape velocity	0.0366 km/s
Rotation period	9.0 hr[1]
Albedo	0.144[1][3]
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.^[4]

References

1. "JPL Small-Body Database Browser: 77 Frigga" (2012-01-04 last obs). Jet Propulsion Laboratory. Retrieved 2012-01-27.
2. Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
3. Asteroid Data Sets
4. "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 2012-01-27.

External links

• Orbital simulation from JPL (Java) / Ephemeris
• 77 Frigga at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters