Here is the information from the SpaceX presskit on the mission:
This mission will launch the Deep Space Climate Observatory (DSCOVR), a satellite in partnership with NOAA, NASA, and the USAF that will observe and provide advanced warning of extreme emissions from the sun which can affect power grids, communications systems, and satellites close to Earth. At launch, DSCOVR will weigh approximately 570 kg and is equipped with two deployable solar arrays, a propulsion module, boom, and high-gain antenna.Update: The Sunday launch was delayed due to a ground-based radar issue. The mission will be attempted again on Monday.
Ultimately, DSCOVR will be positioned at the Sun - Earth L1 Lagrangian point, 1,500,000 kilometers (930,000 mi) from Earth, more than four times farther than the Moon. SpaceX will deliver DSCOVR to a parking orbit just under 200km, and the satellite will reach its final orbit 110 days after launch.
Second Update: SpaceX successfully launched the DSCOVR satellite on Wednesday (Feb. 11). However, the Falcon 9 did not land on the platform. SpaceX stated:
While extreme weather prevented SpaceX from attempting to recover the first stage, data shows the first stage successfully soft landed in the Atlantic Ocean within 10 meters of its target. The vehicle was nicely vertical and the data captured during this test suggests a high probability of being able to land the stage on the drone ship in better weather.