An

The primary satellite of the world of Altea, An is an astronomical body roughly 4880 kilometers in diameter (approximately 0.38 times the diameter of Altea).
An orbits at a distance, on average, of 500,097km; approximately 39 times the diameter of Altea itself. The orbit of An is at a moderate inclination, relative to the rotation of Altea, at 12.7 degrees to the ecliptic.
An has an orbital period of 39.7 days. While the largest and brightest object in the night skies of Altea, the motion of An is not the basis for the Altean calendar. For reasons which are lost to antiquity, the calendar of months is instead based upon the motion of the smaller, irregular satellite of Tra; the largest object within the planet's ring system, which orbits Altea once every 28 days.
The rotational period of An is relatively slow, turning on its axis once every orbit and a half, or once every 59.5 days. It is not tidally locked to Altea, so throughout the orbits of the moon, Altean An-watchers are able to see all of its surface features.
While astromers have no concrete theories for the formation of An, most agree that it formed concurrently or shortly after Altea itself, although they are at a loss to explain the moon's retrograde orbital direction. A fringe theory, however, which would account for  claims that An was instead captured into its orbit at a date long past the formation of Altea itself. The theory also speculates that Altea originally had a large, closer satellite, which was destroyed, possibly upon the arrival of An; the debris of which now forms Altea's ring system.
The surface of An is heavily cratered and pockmarked, and has shown no signs of any geological activity since records of it were begun by early Elven astronomers in the Age of Awakening.

Type

Planetoid / Moon