Harpalyke (moon)

Harpalyke
Provisional or systematic name	S / 2000 J 5
Central body	Jupiter
Properties of the orbit
Major semi-axis	21,105,000 km
Periapsis	16,335,300 km
Apoapsis	25,874,700 km
Orbit inclination	148.6 °
Orbital time	623.3 d
Mean orbital velocity	2.46 km / s
Physical Properties
Albedo	0.04
Apparent brightness	22.2 mag
Medium diameter	4 km
Dimensions	1.2 × 10 14 kg
Acceleration of gravity on the surface	≈ 0 m / s 2
Escape speed	≈ 0 m / s
discovery
Explorer	IFA Hawaii
Date of discovery	November 23, 2000

Harpalyke (also Jupiter XXII) is one of the smallest known outer moons of the planet Jupiter .

discovery

Harpalyke was discovered by astronomers at the University of Hawaii on November 23, 2000 . It was initially given the provisional designation S / 2000 J 5.

The moon was named after Harpalyke , a daughter of Clymenos from Greek mythology .

Orbit data

Harpalyke orbits Jupiter at a mean distance of 21,105,000 km in 623 days and 7 hours. The track has an eccentricity of 0.226. With an inclination of 148.6 ° from 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 trajectory characteristics, harpalyke is assigned to the Ananke group , named after the Jupiter moon Ananke .

Physical data

Harpalyke has a mean diameter of about 4 km. Their density is estimated at 2.6 g / cm³. It is probably made up mainly of silicate rock. Harpalyke has a very dark surface with an albedo of 0.04, i. that is, only 4% of the incident sunlight is reflected. Their apparent brightness is 22.2 ^m .

Web links

• IAUC 7555: Satellites of Jupiter January 5, 2001 (discovery)
• MPEC 2001-A28: S / 2000 J 2, S / 2000 J 3, S / 2000 J 4, S / 2000 J 5, S / 2000 J 6 January 5, 2001 (discovery)
• MPEC 2001-U21: S / 2000 J 2, S / 2000 J 5 October 18, 2001 (rediscovery)
• IAUC 7998: Satellites of Jupiter (numbering and naming)

before	Jupiter moons	after that
Chaldene	Harpalyke	Kalyke