221 Eos
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 18 January 1882 |
| Designations | |
|
Named after
|
Eos |
| Main belt (Eos) | |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 130.21 yr (47561 d) |
| Aphelion | 3.3249 AU (497.40 Gm) |
| Perihelion | 2.69594 AU (403.307 Gm) |
| 3.01044 AU (450.355 Gm) | |
| Eccentricity | 0.10447 |
| 5.22 yr (1907.8 d) | |
|
Average orbital speed
|
17.16 km/s |
| 66.5202° | |
| 0° 11m 19.284s / day | |
| Inclination | 10.880° |
| 141.845° | |
| 193.56° | |
| Earth MOID | 1.68615 AU (252.244 Gm) |
| Jupiter MOID | 2.02439 AU (302.844 Gm) |
| Jupiter Tisserand parameter | 3.214 |
| Physical characteristics | |
| Dimensions |
103.87±3.6 km 103.52 ± 5.60 km |
| Mass | (5.87 ± 0.34) × 1018 kg |
|
Mean density
|
10.10 ± 1.74 g/cm3 |
| 10.443 h (0.4351 d) | |
| 0.1400±0.010 | |
| K | |
| 7.67 | |
221 Eos /ˈiːɒs/ is a large main-belt asteroid that was discovered by Johann Palisa on January 18, 1882, in Vienna. In 1884, it was named after Eos, the Greek goddess of dawn, to honour the opening of a new observatory that was hoped to bring about a new dawn for Viennese astronomy.
Based upon its spectral characteristics, this object is classified as a K-type asteroid. The orbital properties show it to be a member of the extensive Eos asteroid family, which is named after it.
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