Kalyke (moon)

Kalyke
Provisional or systematic name	S / 2000 J 2
Central body	Jupiter
Properties of the orbit
Major semi-axis	23,583,000 km
Periapsis	17,805,200 km
Apoapsis	26,010,800 km
eccentricity	0.245
Orbit inclination	165.2 °
Orbital time	743.0 d
Mean orbital velocity	2.31 km / s
Physical Properties
Albedo	0.04
Apparent brightness	21.8 mag
Medium diameter	5 km
Dimensions	~ 1.9 × 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

Kalyke (also Jupiter XXIII) is one of the smaller outer moons of the planet Jupiter .

discovery

Kalyke was discovered by astronomers at the University of Hawaii on November 23, 2000 . It was initially given the provisional designation S / 2000 J 2.

The moon was named after Kalyke , a lover of Zeus from Greek mythology .

Orbit data

Kalyke orbits Jupiter at an average distance of 23,564,000 km in 743 days. The track has an eccentricity of 0.2464. With an incline of 165.2 ° the orbit is retrograde, i.e. That is, the moon moves against the direction of rotation of Jupiter around the planet with an average orbital speed of 8185.7 km / h.

Due to its orbital properties, Kalyke is assigned to the Carme group , named after the Jupiter moon Carme .

Physical data

Kalyke has a diameter of about 5 km. Its density is estimated at 2.6 g / cm³. It is probably made up mainly of silicate rock. Kalyke 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 21.8 ^m .

Special characteristics

This Jupiter moon differs from the others because of its deep red color, as the other moons of the Carme group are characterized by a bright red color. Due to the enormous brightness of Jupiter and its distance from the moon, it was difficult to determine Kalyke's size and shape. Ultimately, through calculations, it was possible to determine an equatorial radius of 2.6 km, whereby the shape of the moon remains uneven because of its small size. With an equatorial circumference of 16.3 km and a volume of 74 km³, Kalyke is 668.3 times smaller than the Earth's moon .

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 October 22, 2002 (numbering and naming)

Individual evidence

1. ↑ Kalyke was mainly discovered by Scott S. Sheppard, David C. Jewitt, Yanga R. Fernandez and Eugene Magnier.
2. ↑ ^{a b} By the Numbers | Kalyke. Retrieved July 2, 2020 . 

before	Jupiter moons	after that
Harpalyke	Kalyke	Iocaste