60 Echo
.png) Three-dimensional model of 60 Echo created based on light-curve. | |
| 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 kg[2] |
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 that name was already used for a satellite of Uranus.[4]
Echo has been studied by radar.[5]
References
- ^ a b c d e "JPL Small-Body Database Browser: 60 Echo". Jet Propulsion Laboratory. 2011-08-14 last obs. Retrieved 2012-01-27.
- ^ a b Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 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
- 60 Echo at the JPL Small-Body Database
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