Ananke (moon)

Ananke
	Ananke photographed by the Haute-Provence Observatory in August 1998
Discovery
Discovered by	Seth B. Nicholson
Discovery site	Mt. Wilson Observatory
Discovery date	28 September 1951
Designations
Designation	Jupiter XII
Pronunciation	/əˈnæŋkiː/
Named after	Ἀνάγκη Anagkē
Adjectives	Anankean /ænəŋˈkiːən/
Orbital characteristics
	Epoch 17 December 2020 (JD 2459200.5)
Observation arc	69.05 yr (24,338 days)
Semi-major axis	0.1406602 AU (21,042,470 km)
Eccentricity	0.1747248
Orbital period (sidereal)	–623.59 d
Mean anomaly	339.61045°
Mean motion	0° 34m 38.281s / day
Inclination	148.67482° (to ecliptic)
Longitude of ascending node	86.44368°
Argument of perihelion	135.63033°
Satellite of	Jupiter
Group	Ananke group
Physical characteristics
Mean diameter	29.1±0.6 km
Mass	1.68×1016 kg (calculated)
Mean density	1.30 g/cm3 (assumed)
Synodic rotation period	8.31±0.15 h
Albedo	0.038±0.006
Apparent magnitude	18.9
Absolute magnitude (H)	11.7

Ananke (/əˈnæŋki/) is a retrograde irregular moon of Jupiter. It was discovered by Seth Barnes Nicholson at Mount Wilson Observatory in 1951.^[1] It is named after the Greek mythological Ananke, the personification of necessity, and the mother of the Moirai (Fates) by Zeus. The adjectival form of the name is Anankean.

Ananke did not receive its present name^[9] until 1975;^[10] before then, it was simply known as Jupiter XII. It was sometimes called "Adrastea"^[11] between 1955 and 1975 (Adrastea is now the name of another satellite of Jupiter).

Ananke gives its name to the Ananke group, retrograde irregular moons which orbit Jupiter between 19.3 and 22.7 Gm, at inclinations of roughly 150°.^[12]

^ ^a ^b Nicholson, S. B. (1951). "An unidentified object near Jupiter, probably a new satellite". Publications of the Astronomical Society of the Pacific. 63 (375): 297–299. Bibcode:1951PASP...63..297N. doi:10.1086/126402.
^ "Ananke". Dictionary.com Unabridged (Online). n.d.
^ Yenne (1987) The Atlas of the Solar System.
^ ^a ^b Cite error: The named reference MPC127087 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Grav2015 was invoked but never defined (see the help page).
^ Chen, Zhenghan; Yang, Kun; Liu, Xiaodong (6 February 2024). "'Life' of dust originating from the irregular satellites of Jupiter". Monthly Notices of the Royal Astronomical Society. 527 (4): 11327–11337. arXiv:2402.03680. doi:10.1093/mnras/stad3829. Retrieved 25 March 2024.
^ Cite error: The named reference Luu1991 was invoked but never defined (see the help page).
^ Cite error: The named reference SheppardMoons was invoked but never defined (see the help page).
^ Nicholson, S.B. (April 1939). "The Satellites of Jupiter". Publications of the Astronomical Society of the Pacific. 51 (300): 85–94. Bibcode:1939PASP...51...85N. doi:10.1086/125010.
^ Marsden, B. G. (7 October 1974). "Satellites of Jupiter". IAU Circular. 2846.
^ Payne-Gaposchkin, Cecilia; Katherine Haramundanis (1970). Introduction to Astronomy. Englewood Cliffs, N.J.: Prentice-Hall. ISBN 0-13-478107-4.
^ Sheppard, S. S., Jewitt, D. C., Porco, C.; Jupiter's Outer Satellites and Trojans Archived 2007-06-14 at the Wayback Machine, in Jupiter: The Planet, Satellites and Magnetosphere, edited by Fran Bagenal, Timothy E. Dowling, William B. McKinnon, Cambridge Planetary Science, Vol. 1, Cambridge, UK: Cambridge University Press, ISBN 0-521-81808-7, 2004, pp. 263-280

[Nicolson1951-1] Nicholson, S. B. (1951). "An unidentified object near Jupiter, probably a new satellite". Publications of the Astronomical Society of the Pacific. 63 (375): 297–299. Bibcode:1951PASP...63..297N. doi:10.1086/126402.

[2] "Ananke". Dictionary.com Unabridged (Online). n.d.

[3] Yenne (1987) The Atlas of the Solar System.

[MPC127087-4] Cite error: The named reference MPC127087 was invoked but never defined (see the help page).

[Grav2015-5] Cite error: The named reference Grav2015 was invoked but never defined (see the help page).

[6] Chen, Zhenghan; Yang, Kun; Liu, Xiaodong (6 February 2024). "'Life' of dust originating from the irregular satellites of Jupiter". Monthly Notices of the Royal Astronomical Society. 527 (4): 11327–11337. arXiv:2402.03680. doi:10.1093/mnras/stad3829. Retrieved 25 March 2024.

[Luu1991-7] Cite error: The named reference Luu1991 was invoked but never defined (see the help page).

[SheppardMoons-8] Cite error: The named reference SheppardMoons was invoked but never defined (see the help page).

[Nicholson1938-9] Nicholson, S.B. (April 1939). "The Satellites of Jupiter". Publications of the Astronomical Society of the Pacific. 51 (300): 85–94. Bibcode:1939PASP...51...85N. doi:10.1086/125010.

[IAUC_2846-10] Marsden, B. G. (7 October 1974). "Satellites of Jupiter". IAU Circular. 2846.

[Gaposchkin-11] Payne-Gaposchkin, Cecilia; Katherine Haramundanis (1970). Introduction to Astronomy. Englewood Cliffs, N.J.: Prentice-Hall. ISBN 0-13-478107-4.

[SheppardJewittPorco2004-12] Sheppard, S. S., Jewitt, D. C., Porco, C.; Jupiter's Outer Satellites and Trojans Archived 2007-06-14 at the Wayback Machine, in Jupiter: The Planet, Satellites and Magnetosphere, edited by Fran Bagenal, Timothy E. Dowling, William B. McKinnon, Cambridge Planetary Science, Vol. 1, Cambridge, UK: Cambridge University Press, ISBN 0-521-81808-7, 2004, pp. 263-280

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