S / 2003 J 4
S / 2003 J 4 | |
---|---|
Central body | Jupiter |
Properties of the orbit | |
Major semi-axis | 23,257,920 km |
Periapsis | 18,513,304 km |
Apoapsis | 28,002,536 km |
eccentricity | 0.204 |
Orbit inclination | 144.9 ° |
Orbital time | 723.2 d |
Mean orbital velocity | 2.34 km / s |
Physical Properties | |
Albedo | 0.04 |
Apparent brightness | 23 likes |
Medium diameter | ≈ 2 km |
Dimensions | ≈ 1.5 * 10 13 kg |
Medium density | 2.6 g / cm 3 |
Acceleration of gravity on the surface | ≈ 0 m / s 2 |
Escape speed | ≈ 0 m / s |
discovery | |
Explorer |
University of Hawaii |
Date of discovery | February 5, 2003 |
S / 2003 J 4 is one of the smaller moons of the planet Jupiter .
discovery
S / 2003 J 4 was discovered by astronomers at the University of Hawaii on February 5, 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 4 according to the system of the International Astronomical Union (IAU).
Orbit data
S / 2003 J 4 orbits Jupiter at an average distance of 23,930,000 km in 755 days, 5 hours and 46 minutes. The track has an eccentricity of 0.3618. With an inclination of 149.581 °, the orbit is retrograde; that is, the moon moves around the planet against the direction of rotation of Jupiter.
Due to its orbital properties, S / 2003 J 4 is assigned to the Pasiphae group , named after the Jupiter moon Pasiphae .
Physical data
S / 2003 J 4 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. Its apparent brightness is 23.0 m .
Web links
- IAUC 8087: Satellites of Jupiter March 4, 2003 (discovery)
- MPEC 2003-E11: S / 2003 J 1, 2003 J 2, 2003 J 3, 2003 J 4, 2003 J 5, 2003 J 6, 2003 J 7 March 4, 2003 (discovery)
before | Jupiter moons | after that |
Eupheme (moon) | S / 2003 J 4 |
S / 2003 J 9 |