Hubble Replacement Expected To "Revolutionize Our View Of The Cosmos"

At a ceremony held Monday at the 2007 Paris Air Show at Le Bourget, National Aeronautic Space Administration Administrator Michael Griffin and European Space Agency Director General Jean-Jacques Dordain signed two agreements defining the terms of cooperation on the James Webb Space Telescope (JWST) and the Laser Interferometer Space Antenna (LISA) Pathfinder mission.

The JWST is considered the successor to the Hubble Space Telescope, although it will operate over a different range of wavelengths. Its launch is targeted for 2013 and it will operate for at least five years.

The telescope is a mission of international cooperation between NASA, ESA and the Canadian Space Agency to investigate the origin and evolution of galaxies, stars and planetary systems, according to NASA.

At the heart of the observatory is a large telescope, which has a primary mirror measuring 21.3 feet in diameter (compared to 7.9 feet for Hubble) that provides a relatively large field of view.

A set of four instruments, including a fine guidance sensor for precision pointing, will combine imaging capability at visible and infrared wavelengths with various spectroscopic modes to learn about the chemistry and evolution of objects in our universe.

NASA says the telescope will operate well outside the Earth's atmosphere at a spot in space called the second Lagrangian point or "L2" located 1 million miles -- or four times farther than the moon's orbit -- in the direction opposite the sun. From this location, the observatory is expected to revolutionize our view of the cosmos as Hubble has.

According to the agreement, NASA will be responsible for the overall management and operation of the JWST mission and will build the spacecraft, the telescope and the platform that will house the instruments. ESA will provide an Ariane 5 ECA rocket for the telescope's launch.

NASA also will provide a major instrument, the Near-Infrared Camera, through the University of Arizona, Tucson. ESA will provide the Near-Infrared Spectrograph operating over similar wavelengths. NASA will also provide the instrument's detectors, which will measure the wavelengths of light emanating from the stars being observed.

NASA also will provide the microshutters, which are used to select which star in the field of view will be observed by the detectors.

The third instrument on board is the Mid-Infrared Instrument. It is being built through a consortium of nationally funded European institutions, which are responsible for the instrument's optical assembly and NASA, with coordination through ESA.

Canada will provide the fourth instrument on board, the Fine Guidance Sensor/Tuneable Filter Imager.

"The signing of this agreement on JWST, based on a long-standing and consolidated cooperation between ESA and NASA, will make history once more," said Dordain. "In particular, we are very proud to use Ariane 5 to put this great observatory into space."

"We're delighted to have ESA's participation on the James Webb Space Telescope," said Griffin. "The tremendous scientific success of the Hubble Space Telescope can be attributed to the cooperative efforts between our two agencies. We expect that, as Hubble's successor, the James Webb Space Telescope also will make profound astronomical observations and discoveries. When it does, we can be proud that it, too, is a project of international cooperation."

At Tuesday's ceremony, the leaders of both agencies also signed an official agreement on the ESA-initiated Laser Interferometer Space Antenna (LISA) Pathfinder mission, currently targeted for launch in early 2010. LISA Pathfinder is aimed at demonstrating the technologies needed for a planned future joint ESA-NASA LISA mission that will detect gravitational waves in space and test the theory of general relativity.

Under this agreement, ESA will design, develop, launch and operate the LISA Pathfinder spacecraft. A consortium of European scientific institutes will provide the LISA Technology Package, which features a sensor to detect non-gravitational forces on the spacecraft.

NASA will provide the Disturbance Reduction System Package. That package will work in tandem with the technology package and consists of thrusters that produce a minute level of force, combined with control systems and software.

FMI: www.nasa.gov, www.esa.int, www.space.gc.ca