Therne is the second star of the Sunly system and the binary companion to the Sun. It is a red dwarf of spectral classification M3V, orbiting the Sun at a mean distance of 30 AU with a period of 140.9 years. Therne is the brightest object in Sunly's night sky apart from the Sun itself, varying between roughly 0.5 and 1.7 times the brightness of a full moon depending on its orbital phase.
Therne
Last edited July 3, 2026