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Echo (minor planet designation: 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]

60 Echo
A990.M1696.shape(1).png
Three-dimensional model of 60 Echo created based on light-curve
Discovery
Discovered byJames Ferguson
Discovery dateSeptember 14, 1860
Designations
MPC designation(60) Echo
Named after
Echo
 
Main belt
AdjectivesEchonian
Orbital characteristics
Epoch December 31, 2006 (JD 2454100.5)
Aphelion423.339 Gm (2.830 AU)
Perihelion292.951 Gm (1.958 AU)
358.145 Gm (2.394 AU)
Eccentricity0.182
1353.002 d (3.70 a)
91.065°
Inclination3.602°
191.803°
270.477°
Physical characteristics
Dimensions60.2 km[1]
Mass(3.15 ± 0.32) × 1017 kg[2]
Mean density
2.78 ± 0.33[2] g/cm3
25.2 hr[1]
0.254[1][3]
S[1]
8.21[1]

Echo has been studied by radar.[5] It is not known to be a member of any asteroid family.[6]

ReferencesEdit

  1. ^ a b c d e "JPL Small-Body Database Browser: 60 Echo". Jet Propulsion Laboratory. 2011-08-14 last obs. Retrieved 2012-01-27.
  2. ^ a b Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
  3. ^ Asteroid Data Sets Archived 2010-01-17 at WebCite
  4. ^ Appletons' annual cyclopaedia and register of important events of the year: 1862. New York: D. Appleton & Company. 1863. p. 173.
  5. ^ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved 2012-01-23.
  6. ^ Carruba, V.; Aljbaae, S.; Winter, O. C. (January 2016), "On the Erigone family and the z2 secular resonance", Monthly Notices of the Royal Astronomical Society, 455 (3): 2279−2288, arXiv:1510.05551, Bibcode:2016MNRAS.455.2279C, doi:10.1093/mnras/stv2430

External linksEdit