Long March 3B/E | Gaofen 4

In geostationary orbit Gaofen 4 will monitor the Earth in the visible light and infrared regions, at a resolution of 50m and 400m respectively for near time civilian applications. The spacecraft is the 4th Gaofen series spacecraft to be launched in China’s High-Definition Earth Observation Satellite (HDEOS) program. The satellite weighs 4600kg, is powered by 2 solar arrays and has an expected lifetime of 8 years.

The Long March 3B / E (G2) (CZ-3B / E) is one of the most successful medium-range launchers and the strongest variant of the CZ-3 series. It was specially developed for the transport of heavy communications satellites into a geostationary transfer orbit. The additional designation "E" stands for a higher payload fairing, stretched boosters and extended fuel tanks at the first stage, over the CZ-3B.

The China Aerospace Science and Technology Corporation (CASC) is the main contractor for the Chinese space program. It is state-owned and has a number of subordinate entities which design, develop and manufacture a range of spacecraft, launch vehicles, strategic and tactical missile systems, and ground equipment. It was officially established in July 1999 as part of a Chinese government reform drive, having previously been one part of the former China Aerospace Corporation. Various incarnations of the program date back to 1956.