Mneme (moon)

Mneme
	Discovery image of Mneme (centered) from February 2003
Discovery
Discovered by	Brett J. Gladman et al.; Scott S. Sheppard et al.
Discovery date	9 February 2003
Designations
Designation	Jupiter XL
Pronunciation	/ˈniːmiː/
Named after	Μνήμη Mnēmē
Alternative names	S/2003 J 21
Adjectives	Mnemean /nɛˈmiːən/
Orbital characteristics
Semi-major axis	21069000 km
Eccentricity	0.227
Orbital period (sidereal)	−620.0 days
Mean anomaly	338.9°
Inclination	148.6°
Longitude of ascending node	18.1°
Argument of perihelion	41.7°
Satellite of	Jupiter
Group	Ananke group
Physical characteristics
Mean diameter	2 km
Apparent magnitude	23.3

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.^[3]^[4]

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

^ "Mneme". Dictionary.com Unabridged (Online). n.d.
^ S.S. Sheppard (2019), Moons of Jupiter, Carnegie Science, on line
^ IAUC 8138: S/2003 J 21 2003 May 30 (discovery)
^ MPEC 2003-K45: S/2003 J 21 2003 May 29 (discovery and ephemeris)
^ IAUC 8502: Satellites of Jupiter 2005 March 30 (naming the moon)

[1] "Mneme". Dictionary.com Unabridged (Online). n.d.

[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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v t e Moons of Jupiter
Listed in increasing approximate distance from Jupiter
Inner moons	Metis Adrastea Amalthea Thebe
Galilean moons	Io Europa Ganymede Callisto
Themisto	Themisto
Himalia group (9)	Leda Ersa S/2018 J 2 Himalia Pandia Lysithea Elara S/2011 J 3 Dia
Carpo group (2)	S/2018 J 4 Carpo
Valetudo	Valetudo
Ananke group (26)	Euporie Jupiter LV Eupheme S/2021 J 3 Jupiter LII Jupiter LIV Mneme Euanthe S/2003 J 16 Harpalyke Orthosie S/2022 J 3 Helike S/2021 J 2 Praxidike Jupiter LXIV S/2021 J 1 S/2003 J 12 Jupiter LXVIII Thelxinoe Thyone S/2003 J 2 Ananke Iocaste Hermippe Jupiter LXX
Carme group (30)	S/2022 J 1 S/2022 J 2 S/2016 J 3 Pasithee Jupiter LXIX S/2021 J 6 S/2003 J 24 Chaldene Jupiter LXIII Isonoe S/2021 J 4 Kallichore Erinome Kale Eirene Aitne Eukelade Arche Taygete Jupiter LXXII Carme Herse Jupiter LXI Jupiter LI S/2003 J 9 Jupiter LXVI Kalyke S/2018 J 3 S/2021 J 5 S/2003 J 10
Pasiphae group (18)	Philophrosyne Eurydome Jupiter LVI S/2003 J 4 S/2016 J 4 Jupiter LXVII Hegemone Pasiphae Sponde Megaclite Cyllene Sinope Jupiter LIX Aoede Autonoe Callirrhoe S/2003 J 23 Kore
See also	Rings of Jupiter Jupiter's moons in fiction
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