Live coverage: Probe heading to Mercury blasts off from French Guiana

The European-built Solar Orbiter spacecraft was installed on top of its United Launch Alliance Atlas 5 launcher Friday at Cape Canaveral, ready for final charging and checkouts before liftoff Feb. 9 to finally begin a more than $1.5 billion science mission first approved by the European Space Agency nearly 20 years ago.

Delays in the debut of SpaceX’s huge Falcon Heavy rocket have prompted ViaSat to move the launch of a high-speed Internet communications satellite from the new privately-developed booster to an Ariane 5 flight in early 2017, officials said last week.

A Vega rocket fired into space at 8:52 p.m. EST Monday (0152 GMT Tuesday) from the Guiana Space Center in South America, but the mission deviated from its planned trajectory. The rocket was boosting a Spanish Earth observation satellite and a French research payload into orbit.