Mneme (moon)

Mneme /ˈniːmiː/, also known as Jupiter XL, is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard, et al. in 2003, and was provisionally designated S/2003 J 21.[3][4]

Mneme
Discovery
Discovered byScott S. Sheppard
Discovery date2003
Designations
Designation
Jupiter XL
Pronunciation/ˈniːmiː/[1]
Named after
Μνήμη Mnēmē
S/2003 21
AdjectivesMnemean /nɛˈmiːən/
Orbital characteristics [2]
21069000 km
Eccentricity0.227
−620.0 days
338.9°
Inclination148.6°
18.1°
41.7°
Satellite ofJupiter
GroupAnanke group
Physical characteristics
Mean diameter
2 km
23.3

    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.

    It was named in March 2005 after Mneme, one of the three original Muses.[5] She is sometimes confused with Mnemosyne, mother of the Muses (the three or the nine, depending on the author) by Zeus (Jupiter).

    Mneme belongs to the Ananke group, retrograde irregular moons which orbit Jupiter between 19.3 and 22.7 million kilometres, at inclinations of roughly 150°.

    References
    1. "Mneme". Dictionary.com Unabridged. Random House.
    2. S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
    3. IAUC 8138: S/2003 J 21 2003 May 30 (discovery)
    4. MPEC 2003-K45: S/2003 J 21 2003 May 29 (discovery and ephemeris)
    5. IAUC 8502: Satellites of Jupiter 2005 March 30 (naming the moon)
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