Name

Diameter
Orbit
million km

Period
   
Ananke 28 km 21.3 610.5 days   In fact, its highly eccentric orbit varies between 12.6 and 29.1 million km. 
Praxidike 7 km 20.8 613.9 days    
Iocaste 5 km 20.7 609.4 days    
Harpalyke 4 km 21.1 624.5 days    
Thyone 4 km 21.4 639.8 days    
Euanthe 3 km 20.5 598.1 days    
Euporie 2 km 19.1 538.8 days    
Helike 4 km 20.5 601.4 days    
Hermippe 4 km 21.2 629.8 days    
Mneme 2 km 21.4 640.8 days    
Orthosie 2 km 20.6 602.6 days    
Thelxinoe 2 km 20.5 597.6 days    
Deborah & William Hillyard
Deborah & William Hillyard
Deborah & William Hillyard
Deborah & William Hillyard
Deborah & William Hillyard

Solar System -

Jupiter's Moons

Ananke Group

The Ananke Group of retrograde, irregular moons comprises twelve known moons.  All these moons orbit Jupiter at average distances between 19.3 and 22.7 million km (14.2 and 15 million miles).  The orbits are highly eccentric.  It is likely that the Ananke group formed when a captured asteroid broke up as a result of a low velocity collision. The orbits and inclinations of the various moons are very similar.  Where color measurements have been obtained, they are, again, very similar.  It is likely that Ananke was the parent, and the other moons broke off. 
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