What type of satellite is the corona satellite?

Reconaissance satellites !

Explanation:

The Corona program was a series of American strategic reconnaissance satellites produced and operated by the Central Intelligence Agency Directorate of Science & Technology with substantial assistance from the U.S. Air Force. The Corona satellites were used for photographic surveillance of the Soviet Union (USSR), the People's Republic of China, and other areas beginning in June 1959 and ending in May 1972.

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the corona satellite designate KH-1 ,KH-2, KH-3, KH-4, KH-4A AND KH-4B              KH stood for key hole or keyhole , with the name being an analogy to the act of spying into a persons room by peering through their keyholes.

Explanation: