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The Delta IV Heavy second stage has fired its RL10 engine for the second and final time and is now in a coast phase for the launch of NASA’s Parker Solar Probe.

The Delta IV Heavy second stage is firing its small thrusters to position itself and NASA’s Parker Solar Probe into the proper position to fire its main engine for the final time during the mission.

The Delta IV Heavy upper stage main engine has started its burn following on-time booster engine cutoff and booster separation as part of NASA’s Parker Solar Probe launch.

Booster ignition and liftoff of the United Launch Alliance Delta IV Heavy rocket at 3:31 a.m. EDT, from Space Launch Complex 37 at Cape Canaveral Air Force Station in Florida, carrying NASA’s Parker Solar Probe.

The Parker Solar Probe countdown is underway toward a liftoff at 3:31 a.m. EDT.

The launch countdown is in a T-4 minute hold. The launch team is proceeding toward launch of a United Launch Alliance Delta IV Heady rocket carrying Parker Solar Probe on a mission to the Sun.

In 2017, Parker Solar Probe was renamed for Eugene Parker, the S Chandrasekhar Distinguished Service Professor Emeritus, Department of Astronomy and Astrophysics at the University of Chicago.

The United Launch Alliance Delta IV Heavy rocket reached another major milestone on the road to T-Zero, as NASA’s Parker Solar Probe is prepared for launch.

All is ready for launch of a United Launch Alliance Delta IV Heavy rocket carrying NASA’s Parker Solar Probe. Liftoff is scheduled for 3:31 a.m. EDT from Space Launch Complex 37 at Cape Canaveral Air Force Station.

Hello, and welcome back to our coverage of the Parker Solar Probe launch. Everything is proceeding toward launch of the pioneering spacecraft at 3:31 a.m. EDT on a United Launch Alliance Delta IV Heavy rocket from Space Launch Complex 37 at Cape Canaveral Air Force Station in Florida. The weather forecast has improved to 95 …