Elara

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Elara
Elara is a prograde irregular satellite of Jupiter. It has a mean radius of just 43 km, thus it is 2% of the size of Europa. However it is half the size of Himalia, so it is the second biggest moon in the Himalia group. It might be a captured type C or D asteroid, for it reflects very little light. Its orbital elements are as of January 2000. They are continuously changing due to solar and planetary perturbations. Elara (moon) - Wikipedia, the free encyclopedia
Additional Information

Additional Information

Short Description Elara is a prograde irregular satellite of Jupiter. It has a mean radius of just 43 km, thus it is 2% of the size of Europa. However it is half the size of Himalia, so it is the second biggest moon in the Himalia group. It might be a captured type C or D asteroid, for it reflects very little light. Its orbital elements are as of January 2000. They are continuously changing due to solar and planetary perturbations. Elara (moon) - Wikipedia, the free encyclopedia
Discovered by Charles Dillon Perrine
Discovery date January 5, 1905
Type Moon
AddInfo Jupiter VII
Satellite of Jupiter
Orbit Prograde
Rotation Direct
Apoapsis 08 14 293 500 km
Periapsis 07 9 188 500 km
Semi-major axis 08 11 741 000 km
Distance from Sun 01 5.202 60 au /13
Eccentricity 0.217 4
Orbital period 259.64 days | 0.708 year
Orbital speed 01 3.27 km/s
Inclination to the ecliptic 026.63°
Inclination to the equator 030.66°
Diameter/Size 02 86 km
Mass 1017×8.7 kg
Density 01 2.6 g/cm3
Surface gravity  0.031m/s2
Escape velocity 02 52 m/s
Rotation period 0.5 day | 12 hours
Albedo geometric 0.04
Temperature mean 03 124 K
Apparent magnitude 16.3
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