Mneme (moon)

Mnemes
Provisional or systematic name	S / 2003 J 21
Central body	Jupiter
Properties of the orbit
Major semi-axis	21,069,000 km
Periapsis	16,286,000 km
Apoapsis	25,852,000 km
eccentricity	0.227
Orbit inclination	148.6 °
Orbital time	620.0 d
Mean orbital velocity	2.44 km / s
Physical Properties
Albedo	0.04
Apparent brightness	23.3 mag
Medium diameter	2 km
Dimensions	~ 1.5 × 10 13 kg
Medium density	2.6 (?) G / cm 3 g / cm 3
Acceleration of gravity on the surface	≈ 0 m / s 2
Escape speed	≈ 0 m / s
discovery
Explorer	IFA Hawaii
Date of discovery	February 6, 2003

Mneme (also Jupiter XL) is one of the smaller moons of the planet Jupiter .

discovery

Mneme was discovered by astronomers at the University of Hawaii on February 6, 2003 . Mneme is named after the muse Mneme .

Orbit data

Mneme orbits Jupiter at a mean distance of 21,069,000 km in 620 days and 58 minutes. The track has an eccentricity of 0.2273. With an inclination of 148.6 ° from the local Laplace plane , the orbit is retrograde; that is, the moon moves around the planet against the direction of rotation of Jupiter.

Due to its orbital properties, Mneme is assigned to the Ananke group , named after the Jupiter moon Ananke .

Physical data

Mneme has a diameter of about 2 km. The density is estimated at 2.6 g / cm³, provided that the assumption of a structure consisting mainly of silicate rock is correct. It has a very dark surface with an albedo of 0.04, i.e. that is, only 4% of the incident sunlight is reflected. Their apparent brightness is 23.3 ^m .

Web links

Wiktionary: Mnemes  - explanations of meanings, word origins, synonyms, translations

• MPEC 2003-K45: S / 2003 J 21 May 29, 2003 (discovery)
• IAUC 8138: S / 2003 J 21 May 30, 2003 (discovery)
• MPEC 2004-B42: S / 2003 J 21 January 24, 2004 (rediscovery)
• IAUC 8502: Satellites of Jupiter March 30, 2005 (numbering and naming)

before	Jupiter moons	after that
Hegemone	Mnemes	Aoede