Herschel Space Observatory

The Herschel spacecraft

Herschel Space Observatory

With a mirror measuring 3.5m in diameter, the Herschel Space Observatory is the largest telescope ever to be flown into space.

Launched by the European Space Agency in May 2009, it is currently orbiting the Sun at a position 1.5 million km away from Earth. By operating in the infrared region of the spectrum, the telescope is able to 'see through' gas and dust clouds which can block visible light. Scientists using the telescope hope that this will tell them more about the formation of stars and galaxies.

Image: An artist's impression of the Herschel spacecraft (credit: ESA)

Watch and listen to clips from past programmes TV clips [3] Radio Programmes [1]

The Herschel spacecraft


Herschel is the largest telescope ever launched into space.

About Herschel Space Observatory

The Herschel Space Observatory was a space observatory built and operated by the European Space Agency (ESA). It was active from 2009 to 2013, and was the largest infrared telescope ever launched, carrying a single 3.5-metre (11.5 ft) mirror and instruments sensitive to the far infrared and submillimetre wavebands (55–672 µm). Herschel was the fourth and final cornerstone mission in the Horizon 2000 programme, following SOHO/Cluster II, XMM-Newton and Rosetta. NASA is a partner in the Herschel mission, with US participants contributing to the mission; providing mission-enabling instrument technology and sponsoring the NASA Herschel Science Center (NHSC) at the Infrared Processing and Analysis Center and the Herschel Data Search at the Infrared Science Archive.

The observatory was carried into orbit in May 2009, reaching the second Lagrangian point (L2) of the Earth–Sun system, 1,500,000 kilometres (930,000 mi) from Earth, about two months later. Herschel is named after Sir William Herschel, the discoverer of the infrared spectrum and planet Uranus, and his sister and collaborator Caroline Herschel.

The observatory was capable of seeing the coldest and dustiest objects in space; for example, cool cocoons where stars form and dusty galaxies just starting to bulk up with new stars. The observatory sifted through star-forming clouds—the "slow cookers" of star ingredients—to trace the path by which potentially life-forming molecules, such as water, form.

The telescope's lifespan was governed by the amount of coolant available for its instruments; when that coolant ran out, the instruments would stop functioning correctly. At the time of its launch, operations were estimated to last 3.5 years (to around the end of 2012). It continued to operate until 29 April 2013 15:20 UTC, when Herschel ran out of coolant.

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