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 | |
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
- 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 |