221 Eos
| Discovery A |
| Discoverer |
Johann Palisa |
| Discovery date |
January 18, 1882 |
Alternate
designations |
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)) |
141.959° |
Argument of
perihelion (ω) |
196.03° |
| 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
temperature |
unknown |
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.
References
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For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.
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