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°.

References

1. MPEC 2001-A29: S/2000 J 7, S/2000 J 8, S/2000 J 9, S/2000 J 10, S/2000 J 11 2001 January 15 (discovery and ephemeris)
2. "M.P.C. 115890" (PDF). Minor Planet Circular. Minor Planet Center. 27 August 2019.
3. "Planetary Satellite Physical Parameters". Jet Propulsion Laboratory. 19 February 2015. Retrieved 26 November 2020.
4. Graykowski, Ariel; Jewitt, David (5 April 2018). "Colors and Shapes of the Irregular Planetary Satellites". The Astronomical Journal. 155 (4): 184. arXiv:1803.01907. doi:10.3847/1538-3881/aab49b. ISSN 1538-3881.
5. Sheppard, Scott. "Scott S. Sheppard – Jupiter Moons". Department of Terrestrial Magnetism. Carnegie Institution for Science. Retrieved 26 November 2020.
6. IAUC 7555: Satellites of Jupiter Archived 2002-09-16 at the Wayback Machine 2001 January 5 (discovery)
7. MPEC 2001-T59: S/2000 J 8, S/2000 J 9, S/2000 J 10 2001 October 15 (revised ephemeris)
8. IAUC 7998: Satellites of Jupiter 2002 October 22 (naming the moon)