The launch of NASA’s Orbiting Carbon Observatory-2 (OCO-2) aboard a United Launch Alliance Delta II rocket is scheduled for Wednesday, July 2 at 5:56 a.m. EDT (2:56 a.m. PDT) from Space Launch Complex 2 at Vandenberg Air Force Base in California.

The launch team has completed troubleshooting of the launch pad water suppression system that resulted in the scrub of the launch attempt Tuesday. A valve that is part of the pulse suppression water system, which had operated properly during tests shortly before the launch countdown, failed to function properly during the final minutes of the launch attempt. The failed valve has been replaced with a spare, and the system is being tested in preparation for Wednesday's launch attempt.

The OCO-2 mission will produce the most detailed picture to date of natural sources of carbon dioxide, as well as their "sinks" -- places on Earth’s surface where carbon dioxide is removed from the atmosphere. The observatory will study how these sources and sinks are distributed around the globe and how they change over time.

The launch weather forecast is unchanged with a 100 percent chance of favorable conditions at liftoff, which is targeted for 5:56:23 EDT (2:56:23 PDT) at the opening of a 30-second launch window. 

NASA Television coverage will begin at 3:45 a.m. EDT (12:45 a.m. PDT) Wednesday. For NASA TV downlink and schedule information and streaming video, visit:

http://www.nasa.gov/nasatv

NASA's Jet Propulsion Laboratory in Pasadena, California, is responsible for project management of OCO-2. Orbital Sciences Corp., built the OCO-2 spacecraft. NASA’s Launch Services Program at the agency’s Kennedy Space Center in Florida provides launch management. United Launch Alliance of Centennial, Colorado, is NASA’s launch service provider for the Delta II rocket.

For more information about OCO-2, visit:

http://www.nasa.gov/oco2

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