MoonMoon of Jupiter
Harpalyke
A retrograde irregular moon of Jupiter in the Ananke group.
4.4km
Diameter21,105,000km
From Jupiter623.3days
Orbital Period2000
DiscoveredAbout
Harpalyke is a retrograde irregular moon of Jupiter in the Ananke group.
Properties
4.4km
Diameter21,105,000km
Semi-major Axis623.32days
Orbital Period2000
Discovery YearScott S. Sheppard
Discovered ByOther Moons of Jupiter

Io
The most volcanically active body in the solar system and innermost Galilean moon.
3,643.2 km
Diameter
1.8 d
Orbit
1610
Discovered

Europa
Jupiter moon with a subsurface ocean considered a prime candidate for extraterrestrial life.
3,121.6 km
Diameter
3.6 d
Orbit
1610
Discovered

Ganymede
The largest moon in the solar system, bigger than Mercury, with its own magnetic field.
5,268.2 km
Diameter
7.2 d
Orbit
1610
Discovered

Callisto
Jupiter's second-largest moon with the most cratered surface in the solar system.
4,820.6 km
Diameter
16.7 d
Orbit
1610
Discovered