60 Echo
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| Discovery | |
|---|---|
| Discovered by | James Ferguson |
| Discovery date | September 14, 1860 |
| Designations | |
| Named after | Echo |
| Alternative names | |
| Minor planet category | Main belt |
| Adjective | Echonian |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 423.339 Gm (2.830 AU) |
| Perihelion | 292.951 Gm (1.958 AU) |
| Semi-major axis | 358.145 Gm (2.394 AU) |
| Eccentricity | 0.182 |
| Orbital period | 1353.002 d (3.70 a) |
| Average orbital speed | 19.09 km/s |
| Mean anomaly | 91.065° |
| Inclination | 3.602° |
| Longitude of ascending node | 191.803° |
| Argument of perihelion | 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 |
| Equatorial surface gravity | 0.0168 m/s² |
| Escape velocity | 0.0318 km/s |
| Rotation period | 25.2 hr[1] |
| Albedo | 0.254[1][3] |
| Temperature | ~180 K |
| Spectral type | S[1] |
| Absolute magnitude (H) | 8.21[1] |
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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 "JPL Small-Body Database Browser: 60 Echo". Jet Propulsion Laboratory. 2011-08-14 last obs. Retrieved 2012-01-27.
- ↑ 2.0 2.1 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98-118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ↑ Asteroid Data Sets
- ↑ Appletons' annual cyclopaedia and register of important events of the year: 1862. New York: D. Appleton & Company. 1863. p. 173.
- ↑ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 2012-01-23.
External links
- Orbital simulation from JPL (Java) / Ephemeris
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