Name of satellite Ananke
Planet of origin Jupiter
Discovered by Seth Barnes Nicholson
Date of discovery September 28, 1951
Location of discovery Mount Wilson Observatory
Surface color Light red
Mass 2.997 x 10^16 kg
Apogee 16.54 million miles
26.46 million km
Perigee 10.06 million miles
17 million km
Apoapsis 16.54 million miles
26.46 million km
Alternate name(s) Jupiter XII
Named geographical features None

Ananke, also known as Jupiter XII, is a retrograde irregular-shaped satellite belonging to the outer planet of Jupiter. This satellite was discovered by Seth Barnes Nicholson on September 28, 1951 at the Mount Wilson Observatory. It is part of the Ananke group, with it being the largest in said group. The IAU already confirmed that all moons ending in "e" for all retrograde moons, which is the ending letter for all of the names of the satellites in this group (from largest to smallest).


It is believed that Ananke was a stray asteroid in deep space. Ananke was pulled in by Jupiter's gravitational pull. This theory is proven due to Ananke having a composition matching those of P-type asteroids, which may contain water ice.

800px-Asteroid 1998 KY26.faces model
Ananke, (1998)

(French) Ananké le 15 août 1998 à 0h 47 UTC télescope de 120cm - champ de 5'x 5'(c) (Original) Ananke on August 15, 1998 at 0:47 UTC telescope of 120cm - field of 5'x 5 '(c)


The surface of Ananke has a visible spectrum of light red that telescopes in astronomy labs display, yet, it displays an infrared spectrum not visible similar to P-type asteroids, which show signs of water ice, silicates and carbon.

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