Wolf 940B

Wolf 940B is a brown dwarf that orbits the red dwarf star Wolf 940. It's thought to have formed like a star, but has ended up looking more like gas giant. It is roughly the size of a typical low-mass gas supergiant, despite being between 20 and 30 times as heavy.

The object orbits its star at about 440 AU. At such a wide distance, it takes about 18,000 years to complete a single orbit.

Too small to be stars, so-called “brown dwarfs” have masses lower than stars but larger than gas giant planets. Due to their low temperatures, these objects are very faint in visible light, and are detected by their glow at infrared wavelengths.

Although it has a temperature of 300 degrees C, which is almost hot enough to melt lead, the object is very cool by stellar standards.