Elara (moon)

Encyclopedia : E : EL : ELA : Elara (moon)

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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
Periapsis	9,670,500 km (0.065 AU)
Apoapsis	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	29.20° (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	kg
Mean density	2.6 g/cm3
Surface gravity	~0.031 m/s2 (0.003 g)
Escape velocity	~0.052 km/s
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'-lər-ə or ee-lair'-ə, IPA: [ˈiːlərə, iˈlεrə], Attic Greek Ελάρα) 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

• [Harvard College Observatory Bulletin, 178 (1905) 1]
• [Publications of the Astronomical Society of the Pacific, 17 (1905) 62]
• [Astronomische Nachrichten, 169 (1905) 43/44]

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

 

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