A spy satellite for the U.S. National Reconnaissance Office has been launched from Vandenberg Air Force Base in California.
A United Launch Alliance Atlas 5 rocket carrying the classified NROL-42 satellite lifted off at 10:49 p.m. PDT Saturday. All systems were going well when the launch webcast concluded about three minutes into the flight.
The launch was expected to be visible across a wide area of California, weather permitting.
National Reconnaissance Office satellites gather intelligence information for U.S. national security and an array of other purposes including assessing impacts of natural disasters.
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U.S. officials have not revealed what the spacecraft will be doing or what its orbit will be.
United Launch Alliance is a joint venture of Lockheed Martin and Boeing.