A third companion, known as Gliese 105 C, lies much closer to A, currently at a distance of approximately 24 au. The pair A-C have an estimated orbital period of 61 years. While detected directly, Gliese 105 C has also been observed to perturb Gliese 105 A from its usual position; from that, its orbit is estimated to have a high eccentricity of around 0. 75 and a semimajor axis of 15 au. Gliese 105 C is an extremely faint red dwarf. It is roughly 8 to 9 percent the mass of the Sun, and it is about 20,000 times fainter than its parent star in visible light—at a distance of 1 au (the distance from the Earth to the Sun) it would only be four times brighter than the full moon.