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Mneme is a small moon of Jupiter that orbits the giant planet in space. It matters because studying the moons around Jupiter helps scientists understand how planetary systems form and evolve.
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Mneme /ˈniːmiː/, also known as Jupiter XL, is a retrograde irregular satellite of Jupiter. It was discovered by teams of astronomers led by Brett J. Gladman and Scott S. Sheppard in 2003, and was provisionally designated S/2003 J 21. Mneme has a 15 year observation arc and has not been observed since 2017.
Mneme is about 2 kilometres in diameter, and orbits Jupiter at an average distance of 21,427,000 kilometres in 640.769 days, at an inclination of 149° to the ecliptic (148° to Jupiter's equator) with an eccentricity of 0.2214. Its average orbital speed is 2.43 km/s.