S / 2003 J 4

from Wikipedia, the free encyclopedia
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

before Jupiter moons after that
Eupheme (moon) S / 2003 J 4
S / 2003 J 9