The H.E.S.S. instrument consists of four 13 m (H.E.S.S. I) and one 28 m diameter (H.E.S.S. II) Atmospheric Cherenkov Telescopes (ACTs) located in the Khomas Highland in Namibia, 1800 m above sea level. The H.E.S.S. I array began operations in 2003, and has achieved recent scientific results allowed by the synergy with the Fermi-LAT, some of which are outlined here.

The H.E.S.S. II telescope started operations in July 2012, and is expected to provide its first scientific results by the end of the year. Since the inauguration of the first telescope in September 2002, H.E.S.S. has taken 9415 hours of data, with 4234 hours in the band of the Galaxy and 5181 hours in extragalactic space, discovered over 80 new very high energy (VHE; E > 100 GeV) {\gamma}-ray sources (according to TeVCat listings), among them more than 60 galactic objects and 19 extragalactic sources.