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.

The 81st flight of a United Launch Alliance Atlas 5 rocket, set for liftoff Friday from Cape Canaveral, will come with its share of firsts when it sends Boeing’s Starliner crew capsule toward the International Space Station on an unpiloted test flight. The launcher will fly without a payload shroud, which typically envelopes satellites during liftoff, and it will debut an uprated dual-engine Centaur upper stage that will power the Starliner on a unique suborbital trajectory optimized for astronaut comfort.

The next American polar-orbiting weather satellite that will feed long-range forecasts and track environmental trends has slipped into space-like testing ahead of launch.