DFS Kopernikus-3 (or Deutscher Fernmelde Satellit-3 and Hellas Sat 1) was a communications satellite operated by Deutsche Telekom.

The DFS Kopernikus series of satellites debuted in 1989 with the third being launched in 1992.

Ordered in 1983 and produced by the GESAT consortium of MBB (flight segment prime contractor), Siemens (overall prime contractor), ANT Nachrichtentechnik (payload), Standard Elektrik Lorenz (digital switching equipment), and Dornier Systems (ground control system), DFS spacecraft are smaller than TV-Sat: on-station mass is 850 kg with a 15.4 m solar array span providing up to 1.5 kW of electrical power.

DFS 3 was leased to the Greek company Hellas Sat in 2002 as a stop-gap measure.

DFS-Kopernikus 3 was launched by a Delta II launch vehicle from Cape Canaveral Air Force Station (CCAFS), Florida, United States, at 09:47:00 UTC on 12 October 1992.