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Elara

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Elara
Elara-celestia
Elara in Celestia
Discovery
Discovered by Charles Dillon Perrine
Discovery date 1905
Designation
Other names Jupiter VII
Pronounced 'ehluarua
Orbital Characteristics
Periapsis 1,869,000 km
Apoapsis 1,897,000 km
Semimajor axis 1,882,700 km
Orbital Period 259.64 days (0.708 years)
Average orbital speed 3.27 km/s (7,314 mph, 11,770 kph)
Eccentricity 0.22
Satellite of Jupiter
Physical Characteristics
Volume ~333,000 km3
Mass 8.7×1017 kg
Axial tilt Unknown
Mean density 2.6 g/cm3 (assumed)
Mean radius 43 km
Rotation period Unknown
Albedo 0.04 (assumed)
Surface temperature (min) Unknown
Surface temperature (avg) Unknown
Surface temperature (mean) ~124 K (-236 °F, -149 °C)
Surface temperature (max) Unknown
Apparent magnitude 16.3

Elara is a prograde irregular satellite of Jupiter. It was discovered by Charles Dillon Perrine at Lick Observatory, in 1905. It is the eighth largest moon of Jupiter. The moon is named after Elara, one of Zeus's lovers and the mother of the giant Tityos.

Elara did not actually receive it's name until 1975. Before that, it was known simply as Jupiter VII.

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