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Elara (moon)

From Academic Kids

Elara
Discovery
Discovered by C. D. Perrine
Discovered on January 2, 1905
Orbital characteristics
Mean radius 11,683,120 km (0.07810 AU)
Eccentricity 0.1723
Periastron 9,670,500 km (0.065 AU)
Apastron 13,695,700 km (0.092 AU)
Orbital period 257.984888 d (0.706 a)
Orbital circumference 72,859,500 km (0.487 AU)
Orbital velocity max: 3.919 km/s
mean: 3.269 km/s
min: 2.767 km/s
Inclination 30.72 (to the ecliptic)
30.66 (to Jupiter's equator)
Is a satellite of Jupiter
Physical characteristics
Mean diameter 86 km
Surface area ~23,200 km2
Volume ~333,000 km3
Mass 8.7×1018 kg
Mean density 2.6 g/cm3
Surface gravity 0.031 m/s2 (0.003 g)
Rotation period ~0.5 d (12 h)
Axial tilt  ?°
Albedo 0.04
Surface temp.
min mean max
K K ~124 K
Atmospheric pressure 0 kPa

Elara (ee'-lur-a or ee-lair'-a, IPA or , Greek Ελάρη) is a moon of Jupiter. It was discovered by Charles Dillon Perrine at Lick Observatory in 1905 and is named after the mother by Zeus of the giant Tityus.

Elara did not receive its present name until 1975; before then, it was simply known as Jupiter VII. It was sometimes called "Hera".

It belongs to the Himalia group, five moons orbiting between 11 and 13 Gm from Jupiter at an inclination of about 27.5.

External links


... | Lysithea | Elara | S/2000 J 11 | ...


Jupiter's natural satellites

edit  (http://clipart.academickids.com/encyclopedia/index.php?title=Template:Jupiter_Footer&action=edit)

Metis | Adrastea | Amalthea | Thebe | Io | Europa | Ganymede | Callisto | Themisto | Leda | Himalia | Lysithea | Elara | S/2000 J 11 | Carpo | S/2003 J 12 | Euporie | S/2003 J 3 | S/2003 J 18 | Thelxinoe | Euanthe | Helike | Orthosie | Iocaste | S/2003 J 16 | Ananke | Praxidike | Harpalyke | Hermippe | Thyone | Mneme | S/2003 J 17 | Aitne | Kale | Taygete | S/2003 J 19 | Chaldene | S/2003 J 15 | S/2003 J 10 | S/2003 J 23 | Erinome | Aoede | Kallichore | Kalyke | Eurydome | S/2003 J 14 | Pasithee | Cyllene | Eukelade | S/2003 J 4 | Hegemone | Arche | Carme | Isonoe | S/2003 J 9 | S/2003 J 5 | Pasipha | Sinope | Sponde | Autonoe | Callirrhoe | Megaclite | S/2003 J 2
Amalthea group | Galilean moons | Himalia group | Ananke group | Carme group | Pasipha group
bg:Елара (спътник)

de:Elara (Mond) fr:lara (lune) it:Elara (astronomia) nl:Elara (maan) ja:エララ nn:Jupitermnen Elara pt:Elara sk:Elara (mesiac) sr:Елара sv:Elara zh:木卫七

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