ChaHα8 (also written ChaHa8 when Greek letters are unavailable) is a binary brown dwarf about 640lk=onNaNlk=on from Earth in the constellation Chamaeleon. The designation indicates that it is in the Chamaeleon I star-forming region and that it displays hydrogen-alpha emission. It was discovered in 2000.
It was found in 2007 to have a low-mass substellar companion in orbit around it via radial velocity observations. The companion has a mass of 25–31 Jupiter masses, and the pair orbit each other with a period of 5.2 years and an eccentricity of 0.59.