S / 2003 J 2

S / 2003 J 2
Central body	Jupiter
Properties of the orbit
Major semi-axis	28,570,410 km
Periapsis	17,713,654 km
Apoapsis	39,427,166 km
eccentricity	0.38
Orbit inclination	151.8 °
Orbital time	982.5 d
Mean orbital velocity	2.11 km / s
Physical Properties
Albedo	0.04 (?)
Apparent brightness	23.2 mag
Medium diameter	≈ 2 km
Dimensions	≈ 1.5 13 kg
Medium density	2.6 g / cm 3
Acceleration of gravity on the surface	≈ 0.001 m / s 2
Escape speed	≈ 1.4 m / s
discovery
Explorer	University of Hawaii astronomers
Date of discovery	February 5, 2003
Remarks	Outermost known moon of Jupiter

S / 2003 J 2 is one of the smaller moons of the planet Jupiter .

discovery

S / 2003 J 2 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 referred to as S / 2003 J 2 according to the system of the International Astronomical Union (IAU).

Orbit data

S / 2003 J 2 is the outermost known moon of Jupiter. It orbits the planet at an average distance of 29,541,000 km in 979 days, 23 hours and 46 minutes. The track has an eccentricity of 0.2255. With an inclination of 160.638 °, the orbit is retrograde ; that is, the moon moves around the planet against the direction of rotation of Jupiter.

It does not belong to any known group of moons which orbit Jupiter on common orbits.

The limit of Jupiter's gravitational influence is defined by the Hill sphere , the radius of which is approximately . Where and are Jupiter's semi-major axis and mass, and the mass of the sun . This results in a radius of around 52 million kilometers. S 2003 J 2 is up to 36 million km away from Jupiter on its eccentric orbit. Moons further away may be lost. ${\displaystyle a_{j}{\sqrt[{3}]{\frac {m_{j}}{3M_{s}}}}}$ ${\displaystyle a_{j}}$ ${\displaystyle m_{j}}$ ${\displaystyle M_{s}}$

Physical data

S / 2003 J 2 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 23.2 ^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
S / 2017 J 1	S / 2003 J 2	Eupheme (moon)