Erion

Erion is the only natural satellite of the planet Rynoth.

Physical Characteristics

Equatorial radius 1,838.4 km
Polar radius 1,847.1 km
Flattening 0.0047

Volume 2.61 x 10^10 km^3
Mass 1.389564x10^23 kg
Mean Density 5.324 g/cm^3

Orbit

Apogee 422,519 km
Perigee 202,391 km
Eccentricity 0.352256
Inclination 10.34˚ to the elliptic

Sidereal period 23.50879 days
Synodic period 24.85023 days

It has a highly elliptical orbit, causing the size of full moons to vary by 50% throughout the year. The moon's orbit also precesses at a rate of once every 13.69 Rynoth years, causing the time of peak full moon to shift forward by approximately 30.09 days every year.