The European Space Agency’s Solar Orbiter (SolO) mission has been sent on its way by an Atlas V 411 rocket launch. The launch took place at 0403 GMT from Cape Canaveral in Florida. The Centaur stage of the United Launch Alliance rocket put the SolO spacecraft into a heliocentric orbit.  The 1,800 kg spacecraft which is built by Airbus Defence and Space will now use multiple planetary flybys of Venus to modify its two year approach to its imaging orbit at a distance of only 42 million km from the Sun.

Artist’s impression of Solar Orbiter (SolO). Courtesy: ESA

NASA is a partner on the mission, while the UK’s space industry has led much of the instrument design for the US$1.5 billion mission.

The SolO spacecraft will image the Sun’s surface, and use instruments to measure it, including the Sun’s poles,  in an attempt to research how solar weather emanates from the star. The spacecraft is powered from temperatures of over 600 degrees Celsius by protected solar arrays and employs a heat shield part made from baked animal bones to protest the cameras and instruments from the heat. Peep holes are opened for short periods to allow images and readings to take place.

Bizarrely, despite the extreme temperatures, the instruments also need thermal heaters to protect them from the cold behind the heat shield.

Peepholes to allow imaging and reading taking through the thermal protection of Solar Orbiter. Courtesy: ESA/S. Corvagia