60 Echo
From Infogalactic: the planetary knowledge core
| Discovery | |
|---|---|
| Discovered by | James Ferguson |
| Discovery date | September 14, 1860 |
| Designations | |
|
Named after
|
Echo |
| Main belt | |
| Adjectives | Echonian |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 423.339 Gm (2.830 AU) |
| Perihelion | 292.951 Gm (1.958 AU) |
| 358.145 Gm (2.394 AU) | |
| Eccentricity | 0.182 |
| 1353.002 d (3.70 a) | |
|
Average orbital speed
|
19.09 km/s |
| 91.065° | |
| Inclination | 3.602° |
| 191.803° | |
| 270.477° | |
| Physical characteristics | |
| Dimensions | 60.2 km[1] |
| Mass | (3.15 ± 0.32) × 1017[2] kg |
|
Mean density
|
2.78 ± 0.33[2] g/cm3 |
| 0.0168 m/s² | |
| 0.0318 km/s | |
| 25.2 hr[1] | |
| Albedo | 0.254[1][3] |
| Temperature | ~180 K |
|
Spectral type
|
S[1] |
| 8.21[1] | |
60 Echo is a quite large main-belt S-type asteroid. It was discovered by James Ferguson of the United States Naval Observatory in Washington D.C., on September 14, 1860. It was his third and final asteroid discovery. It is named after Echo, a nymph in Greek mythology. James Ferguson had initially named it "Titania" not realizing it was already used for a satellite of Uranus.[4]
Echo has been studied by radar.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found. See Table 1.
- ↑ Asteroid Data Sets
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Orbital simulation from JPL (Java) / Ephemeris
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