File:Helike_CFHT_2003-02-25_annotated.gif · Wikimedia Commons · See Wikimedia Commons
Helike is a small moon that orbits Jupiter, one of many celestial bodies in the giant planet's system. It was discovered relatively recently in 2003 and belongs to a group of similar moons that astronomers study to better understand Jupiter's formation and the history of the solar system.
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Encyclopedic overview
Helike /ˈhɛləkiː/, also known as Jupiter XLV, is a natural satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaiʻi led by Scott S. Sheppard in 2003, and given the temporary designation S/2003 J 6.
Helike is about 4 kilometres in diameter, and orbits Jupiter at an average distance of 20.54 million kilometres in 601.402 days, at an inclination of 155° to the ecliptic (156° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.1375. Its average orbital speed is 2.48 km/s.
Excerpted from Wikipedia’s “Helike” article, available under the CC BY-SA 4.0 licence.