221 Eos

221 Eos
Discovery A
Discoverer Johann Palisa
Discovery date January 18, 1882
n/a B
Category Main belt (Eos)
Orbital elements C D
Epoch 30 January 2005 (JD 2453400.5)
Eccentricity (e) 0.103
Semi-major axis (a) 450.508 Gm (3.011 AU)
Perihelion (q) 404.104 Gm (2.701 AU)
Aphelion (Q) 496.912 Gm (3.322 AU)
Orbital period (P) 1908.778 d (5.23 a)
Mean orbital speed 17.16 km/s
Inclination (i) 10.887°
Longitude of the
ascending node (Ω))
Argument of
perihelion (ω)
Mean anomaly (M) 351.618°
Physical characteristics
Dimensions 104.0 km
Mass unknown
Density unknown
Surface gravity unknown
Escape velocity unknown
Rotation period 10.436 h
Spectral class K
Absolute magnitude 7.67
Albedo 0.140
Mean surface

221 Eos is a rather large main belt asteroid.. It is classified as a K-type asteroid.

The extensive Eos asteroid family is named after it.

It was discovered by Johann Palisa on January 18, 1882 in Vienna and was named after Eos, Greek goddess of dawn.


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