Gliese 676 is a 10th-magnitude wide binary system of red dwarfs that has an estimated minimum separation of 800 AU with an orbital period of greater than 20,000 years.
[5] The star was a test case for the HARPS-TERRA software for better reduction of data from the HARPS spectrometer in early 2012.
The residual velocities were still somewhat excessive, giving more weight to the existence of other bodies in the system, though still no conclusions could be made.
Between the time of the previous analysis and June 2012, the rest of the radial-velocity measurements used in 2011 were made public,[6] allowing them to be reduced using HARPS-TERRA.
Through 104 trials, the false alarm probability was found to be 0.44%, low enough for it to be included as a periodic, planetary signal.