Orthosia (moon)

Orthosia
Provisional or systematic name	S / 2001 J 9
Central body	Jupiter
Properties of the orbit
Major semi-axis	20,720,000 km
Periapsis	14,902,000 km
Apoapsis	26,538,000 km
eccentricity	0.2808
Orbit inclination	145.921 °
Orbital time	622.56 d
Mean orbital velocity	2.37 km / s
Physical Properties
Albedo	0.04
Apparent brightness	23.1 mag
Medium diameter	≈ 2 km
Dimensions	~ 1.1 × 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	IFA Hawaii
Date of discovery	December 11, 2001

Orthosie (also Jupiter XXXV) is one of the smallest known outer moons of the planet Jupiter .

discovery

Orthosia was discovered on December 11, 2001 by astronomers at the University of Hawaii. It was initially given the provisional designation S / 2001 J 9.

The moon was named after Orthosie , one of the horizons from Greek mythology .

Orbit data

Orthosia orbits Jupiter at a mean distance of 20,720,000 km in 622.56 days. The track has an eccentricity of 0.2808. 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 orbital properties, orthosia is assigned to the Ananke group , named after the Jupiter moon Ananke .

Physical data

Orthosia has a mean diameter of about 2 km. Their density is estimated at 2.6 g / cm³. It is probably made up mainly of silicate rock. Orthosia has a very dark surface with an albedo of 0.04, i.e. that is, only 4% of the incident sunlight is reflected. Their apparent brightness is 23.1 ^m .

Web links

• MPEC 2002-J54: Eleven new Satellites of Jupiter May 15, 2002 (discovery)
• IAUC 7900: Satellites of Jupiter May 16, 2002 (discovery)
• MPEC 2003-D36: S / 2001 J 9 February 28, 2003 (rediscovery)
• IAUC 8177: Satellites of Jupiter, Saturn, Uranus August 8, 2003 (numbering and naming)

before	Jupiter moons	after that
Euporia	Orthosia	Sponde