|Discovered by||S. B. Nicholson|
|Discovery date||September 28, 1951|
Mean orbit radius
|610.45 d (1.680 a)|
Average orbital speed
|Inclination||148.89° (to the ecliptic)|
149.9° (to Jupiter's equator)
|2.6 g/cm³ (assumed)|
|0.010 m/s2 (0.001 g)|
Ananke is a retrograde non-spherical moon of Jupiter. It was found by Seth Barnes Nicholson at Mount Wilson Observatory in 1951 and is named after the mythological Ananke, the mother of Adrastea by Jupiter. The adjectival form of the name is Anankean.
Ananke did not get its present name until 1975; before then, it was simply known as Jupiter XII. It was sometimes called "Adrastea" between 1955 and 1975. Note that Adrastea is now the name of another moon of Jupiter.
Orbit[change | change source]
Ananke orbits Jupiter on a high eccentricity and high inclination retrograde orbit. Eight non-spherical moons found since 2000 follow similar orbits. The orbital elements are as of January 2000. They are changing a lot due to Solar and planetary perturbations. The diagram illustrates Ananke's orbit in relation to other retrograde non-spherical moons of Jupiter. The eccentricity of selected orbits is represented by the yellow segments (extending from the pericentre to the apocentre). The farthest spherical moon Callisto is located for reference.
Physical characteristics[change | change source]
References[change | change source]
- Jacobson, R. A. (2000). "The Orbits of Outer Jovian Satellites". Astronomical Journal. 120: pp. 2679-2686. doi:10.1086/316817.CS1 maint: extra text (link)
- Sheppard, S. S., Jewitt, D. C., Porco, C.; Jupiter's Outer Satellites and Trojans, 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
- 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.
- Nicholson, S.B. (April 1939). "S. B. Nicholson declines to name the satellites of Jupiter he has discovered". Publications of the Astronomical Society of the Pacific. 51 (300): 85–94.
- Marsden, B. G. (7 October 1974). "Satellites of Jupiter". IAUC Circular. 2846.
- Payne-Gaposchkin, Cecilia; Katherine Haramundanis (1970). Introduction to Astronomy. Englewood Cliffs, N.J.: Prentice-Hall. ISBN 0-134-78107-4.
- Sheppard, S.S.; Jewitt, D.C. (2003). "An abundant population of small irregular satellites around Jupiter". Nature. 423: 261–263. Unknown parameter
- Nesvorný, D.; Beaugé, C. and Dones, L. (2004). "Collisional Origin of Families of Irregular Satellites". The Astronomical Journal. 127: 1768–1783.CS1 maint: multiple names: authors list (link)
- Grav, Tommy; Holman, M.J.; Gladman, B. J.; Aksnes, K. (2003). "Photometric survey of the irregular satellites -_". Icarus. 166: 33-45. doi:10.1016/j.icarus.2003.07.005.CS1 maint: multiple names: authors list (link)
- Grav, Tommy (2004). "Near-Infrared Photometry of the Irregular Satellites of Jupiter and Saturn". The Astrophysical Journal. 605: L141–L144. Unknown parameter
- Ephemeris IAU-MPC NSES