WILLIAM & DEBORAH HILLYARD

Solar System -

Jupiter's Moons

Pasiphae Group

The Pasiphae Group of retrograde, irregular moons comprises eleven named moons.  All these moons orbit Jupiter at average distances between 22.8 and 24.1 million km.  The orbits are highly eccentric.  It is possible that the Ananke group formed after a captured asteroid broke up as a result of a low velocity collision, but Sinope is so large compared to Pasiphae itself, that this theory is not universally accepted. The orbits and inclinations of the various moons are very similar, but color measurements are not at all conclusive. 

Name

Diameter
Orbit
million km

Period
Pasiphae 58 km 24.1 764.1 days Its highly eccentric orbit varies between 17 and 31.2 million km.  It is grey in color, and is the largest moon in the group.
Sinope 38 km 23.5 724.1 days It is a light red in color, rather different to Pasiphae, and its infrared spectrum is also different, implying it could have a different origin to other members of the group. 
Callirrhoe 8.6 km 24.1 758.8 days
Megaclite 5.4 km 24.7 792.4 days
Autonoe 4.0 km 24.3 772.2 days
Eurydome 3.0 km 23.2 723.4 days
Sponde 2.0 km 24.3 771.6 days
Hegemone 3.0 km 23.7 745.5 days
Cyllene 2.0 km 23.4 731.1 days
Aoede 4.0 km 23.0 714.7 days
Kore 2.0 km 23.2 723.7 days
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Jupiter's moons are grouped as follows.  Select to see details of the moon or the group of moons: