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 | |
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
- ↑ Kalyke was mainly discovered by Scott S. Sheppard, David C. Jewitt, Yanga R. Fernandez and Eugene Magnier.
- ↑ a b By the Numbers | Kalyke. Retrieved July 2, 2020 .
before | Jupiter moons | after that |
Harpalyke | Kalyke |
Iocaste |