Herschel Space Observatory

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This article is about the future ESA space telescope. For the telescope on the Canary Islands, see William Herschel Telescope
Herschel Space Observatory
Organization ESA
Wavelength regime infrared
Orbit height 1.5×106km from Earth
(L2 Lagrangian point)
Orbit period 1 year
Launch date February 2008 (delayed from July 2007)
Deorbit date (2010 - 2011)
Mass 3,300kg
Other names Far Infrared and Submillimetre Telescope (FIRST)
Webpage http://www.esa.int/esaSC/120390_index_0_m.html
Physical Characteristics
Telescope Style Cassegrain reflector
Primary Reflector Diameter 3500 mm, f/0.5
Collecting Area 9.6m2
Focal Length 27000 mm
Instruments
HIFI Heterodyne Instrument for the Far Infrared
PACS Photodetector Array Camera and Spectrometer
SPIRE Spectral and Photometric Imaging Receiver

The Herschel Space Observatory is a mission of the European Space Agency. It is to be launched in 2008 aboard an Ariane 5 rocket together with Planck and will enter a Lissajous 700 000 km diameter orbit around the second Lagrangian point of the Earth-Sun system, 1.5 million kilometres away from Earth.

The mission was formerly titled the Far Infrared and Sub-millimetre Telescope (or FIRST). It will be the first space observatory to cover the full far infrared and submillimetre waveband, and its telescope will have the largest mirror ever deployed in space (three and a half metres wide). It will specialise in collecting light from distant and poorly known objects, such as newborn galaxies thousands of millions of light-years away. The light will be focused onto three instruments with detectors kept at temperatures below 2 K.

Mission objectives:

The mission is named after Sir William Herschel, who discovered the infrared spectrum.

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