.png) Three-dimensional model of 60 Echo created based on light-curve | |
| Discovery | |
|---|---|
| Discovered by | James Ferguson |
| Discovery date | September 14, 1860 |
| Designations | |
| (60) Echo | |
| Pronunciation | /ˈɛkoʊ/ |
Named after | Echo |
| Main belt | |
| Adjectives | Echoian/ɛˈkoʊ.iən/ |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 2.830 AU (423.4 Gm) |
| Perihelion | 1.958 AU (292.9 Gm) |
| 2.394 AU (358.1 Gm) | |
| Eccentricity | 0.182 |
| 1,353.002 d (3.70 yr) | |
| 91.065° | |
| Inclination | 3.602° |
| 191.803° | |
| 270.477° | |
| Physical characteristics | |
| Dimensions | 60.2 km[1] |
| Mass | (3.15 ± 0.32) × 1017 kg[2] |
Meandensity | 2.78 ± 0.33[2] g/cm3 |
| 25.2 hr[1] | |
| 0.254[1][3] | |
| S[1] | |
| 8.21[1] | |
60 Echo is a quite largemain-beltasteroid. It was discovered byJames Ferguson of theUnited States Naval Observatory inWashington D.C., on September 14, 1860. It was his third and final asteroid discovery. It is named afterEcho, anymph inGreek mythology. James Ferguson had initially named it "Titania", not realizing that name was already used for a satellite ofUranus.[4]
.png)
This object is orbiting theSun with aperiod of 3.70 years, asemimajor axis of2.394 AU, and aneccentricity of 0.18. Itsorbital plane is at an inclination of 3.6° to theplane of the ecliptic. This is a stonyS-type asteroid with a cross-sectional size of 60.2 km that is spinning with arotation period of 25.2 hr.[1] Echo has been studied byradar.[5] It is not known to be a member of anyasteroid family.[6]
