Elara (moon) facts for kids

Kids Encyclopedia Facts
Elara
Discovery
Discovered by C. D. Perrine
Discovery date January 2, 1905
Names
Orbit
Avgdistance from the center of its orbital path 11,740,00 km (0.07810 AU)
How long it takes to complete an orbit 259.64 d (0.708 a)
Average speed 3.27 km/s
Angle above the reference plane
("inclination")
26.63° (to the ecliptic)
30.66° (to Jupiter's equator)
What it orbits Jupiter
Size and other qualities
Average radius 43 km
Surface area ~23,200 km2
Volume ~333,000 km3
Mass 8.7×1017 kg
Average density 2.6 g/cm3 (assumed)
Surface gravity ~0.031 m/s2 (0.003 g)
Escape velocity ~0.052 km/s
How much light it reflects 0.04 (assumed)
Avg. surface temp. ~124 K

Elara is a non-spherical moon of Jupiter. It was found by Charles Dillon Perrine at Lick Observatory in 1905 and is named after the mother by Zeus of the giant Tityus.

Elara did not get its present name until 1975; before then, it was simply known as Jupiter VII. It was sometimes called "Hera" between 1955 and 1975.

Elara belongs to the Himalia group, five moons orbiting between 11,000,000 and 13,000,000 km from Jupiter at an inclination of about 27.5°. Its orbital elements are as of January 2000. They are changing a lot due to Solar and planetary perturbations.

New Horizons encounter

In February and March 2007, the New Horizons spacecraft to Pluto made a number of pictures of Elara, culminating in photos from a distance of five million miles.

Images for kids


Elara (moon) Facts for Kids. Kiddle Encyclopedia.