Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Helike, also known as Jupiter XLV, is a moon of Jupiter. It was discovered by a team of astronomers from the University of Hawaii 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 20,540 Mm in 601.402 days, at an inclination of 155° to the ecliptic, in a retrograde direction and with an eccentricity of 0.1375. It was named in March 2005 after Helike, one of the nymphs that nurtured Zeus in his infancy on Crete.