Chaldene

Chaldene /kælˈdiːniː/, also known as Jupiter XXI, is a retrograde irregular satellite of Jupiter. It was discovered by a team of astronomers from the University of Hawaii led by Scott S. Sheppard, in 2000, and given the temporary designation S/2000 J 10.^[6][1][7]

Chaldene

Chaldene imaged by the Canada-France-Hawaii Telescope in December 2001
Discovery [1]
Discovered by	Scott S. Sheppard David C. Jewitt Yanga R. Fernandez Eugene A. Magnier
Discovery site	Mauna Kea Observatory
Discovery date	23 November 2000
Designations
Designation	Jupiter XXI
Pronunciation	/kælˈdiːniː/
Named after	Χαλδηνή Chaldēnē
Alternative names	S/2000 J 10
Adjectives	Chaldenean /kældɪˈniːən/
Orbital characteristics [2]
Epoch 27 April 2019 (JD 2458600.5)
Observation arc	17.46 yr (6,376 days)
Semi-major axis	0.1604721 AU (24,006,280 km)
Eccentricity	0.1500864
Orbital period (sidereal)	–759.88 d
Mean anomaly	159.35152°
Mean motion	0° 28m 25.54s / day
Inclination	164.25379° (to ecliptic)
Longitude of ascending node	215.26817°
Argument of perihelion	340.66981°
Satellite of	Jupiter
Group	Carme group
Physical characteristics[3]
Mean diameter	4 km
Albedo	0.04 (assumed)
Spectral type	B–V = 0.82 ± 0.05, V–R = 0.50 ± 0.05[4]
Apparent magnitude	22.5[5]
Absolute magnitude (H)	16.0[2]

Chaldene is about 3.8 kilometres in diameter, and orbits Jupiter at an average distance of 22,713,000 km in 759.88 days, at an inclination of 167° to the ecliptic (169° to Jupiter's equator), in a retrograde direction and with an eccentricity of 0.2916.

It was named in October 2002 after Chaldene, the mother of Solymos by Zeus in Greek mythology.^[8]

It belongs to the Carme group, made up of irregular retrograde moons orbiting Jupiter at a distance ranging between 23 and 24 Gm and at an inclination of about 165°.