S / 2003 J 18
S / 2003 J 18 | |
---|---|
Central body | Jupiter |
Properties of the orbit | |
Major semi-axis | 20,426,000 km |
Periapsis | 19,198,000 km |
Apoapsis | 21,654,000 km |
eccentricity | 0.060 |
Orbit inclination | 145.91 ° |
Orbital time | 596.58 d |
Mean orbital velocity | 2.49 km / s |
Physical Properties | |
Albedo | 0.04 |
Apparent brightness | 23.4 mag |
Medium diameter | ≈ 2 km |
Dimensions | ≈ 1.1 × 10 13 kg |
Medium density | asymp; 2.6 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 |
S / 2003 J 18 (also Jupiter LV ) is one of the smaller moons of the planet Jupiter .
discovery
S / 2003 J 18 was discovered by astronomers at the University of Hawaii on February 6, 2003 . The moon has not yet been given an official name - the moons of Jupiter are usually female figures from Greek mythology - but is provisionally designated as S / 2003 J 18 in accordance with the system of the International Astronomical Union (IAU).
Orbit data
S / 2003 J 18 orbits Jupiter at an average distance of 20,426,000 km in 596.58 days. The track has an eccentricity of 0.060. With an inclination of 145.9 ° to 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 orbit characteristics, S / 2003 J 18 is assigned to the Ananke group , named after the Jupiter moon Ananke .
Physical data
S / 2003 J 18 has a diameter of about 2 km. Its density is estimated at 2.6 g / cm³. It is probably made up mainly of silicate rock. It has a very dark surface with an albedo of 0.04, i.e. that is, only 4% of the incident sunlight is reflected.
Web links
- MPEC 2003-G20: S / 2003 J 18 April 4, 2003 (discovery)
- IAUC 8116: Satellites of Jupiter and Saturn April 11, 2003 (discovery)
- MPEC 2017-L09: S / 2003 J 18 June 2nd, 2017 (rediscovery)
before | Jupiter moons | after that |
S / 2016 J 1 | S / 2003 J 18 |
S / 2011 J 2 |