Ananke (moon)

Ananke
Ananke photographed by the Haute-Provence Observatory in August 1998
Discovery[1]
Discovered bySeth B. Nicholson
Discovery siteMt. Wilson Observatory
Discovery date28 September 1951
Designations
Designation
Jupiter XII
Pronunciation/əˈnæŋkiː/[2]
Named after
Ἀνάγκη Anagkē
AdjectivesAnankean /ænəŋˈkiːən/[3]
Orbital characteristics[4]
Epoch 17 December 2020 (JD 2459200.5)
Observation arc69.05 yr (24,338 days)
0.1406602 AU (21,042,470 km)
Eccentricity0.1747248
–623.59 d
339.61045°
0° 34m 38.281s / day
Inclination148.67482° (to ecliptic)
86.44368°
135.63033°
Satellite ofJupiter
GroupAnanke group
Physical characteristics
29.1±0.6 km[5]
Mass1.68×1016 kg (calculated)
Mean density
1.30 g/cm3 (assumed)[6]
8.31±0.15 h[7]
Albedo0.038±0.006[5]
18.9[8]
11.7[4]

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]

  1. ^ 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.
  2. ^ "Ananke". Dictionary.com Unabridged (Online). n.d.
  3. ^ Yenne (1987) The Atlas of the Solar System.
  4. ^ a b Cite error: The named reference MPC127087 was invoked but never defined (see the help page).
  5. ^ a b 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.
  7. ^ Cite error: The named reference Luu1991 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SheppardMoons was invoked but never defined (see the help page).
  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.
  10. ^ Marsden, B. G. (7 October 1974). "Satellites of Jupiter". IAU Circular. 2846.
  11. ^ Payne-Gaposchkin, Cecilia; Katherine Haramundanis (1970). Introduction to Astronomy. Englewood Cliffs, N.J.: Prentice-Hall. ISBN 0-13-478107-4.
  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