S / 2003 J 9

S / 2003 J 9
Central body	Jupiter
Properties of the orbit
Major semi-axis	22,441,680 km
Periapsis	16,404,870 km
Apoapsis	28,478,490 km
eccentricity	0.269
Orbit inclination	164.5 °
Orbital time	683 d
Mean orbital velocity	2.39 km / s
Physical Properties
Albedo	0.04
Apparent brightness	23.7 mag
Medium diameter	≈ 1 km
Dimensions	≈ 1.4 * 10 12 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 6, 2003

S / 2003 J 9 is one of the smaller moons of the planet Jupiter .

discovery

S / 2003 J 9 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 - and is therefore provisionally designated as S / 2003 J 9 in accordance with the system of the International Astronomical Union (IAU).

Orbit data

S / 2003 J 9 orbits Jupiter at a mean distance of 22,441,680 km in 683 days, 6 hours and 58 minutes. The track has an eccentricity of 0.269. With an inclination of 164.5 °, the orbit is retrograde; That is, the moon moves in the opposite direction to Jupiter's direction of rotation around the planet.

Due to its orbit characteristics, S / 2003 J 9 is assigned to the Carme group , named after the Jupiter moon Carme .

Physical data

S / 2003 J 9 has a diameter of about one kilometer. 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. In other words, only four percent of the incident sunlight is reflected. Its apparent brightness is 23.7 ^m .

Web links

• IAUC 8089: Satellites of Jupiter March 7, 2003 (discovery)
• MPEC 2003-E29: S / 2003 J 9, 2003 J 10, 2003 J 11, 2003 J 12; S / 2003 J 1, 2003 J 6 March 7, 2003 (discovery)

before	Jupiter moons	after that
S / 2003 J 4	S / 2003 J 9	S / 2003 J 10