2012 National Reconnaissance Office space telescope donation to NASA - Wikipedia

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2012 National Reconnaissance Office space telescope donation to NASA

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From Wikipedia, the free encyclopedia

Declassification and donation to NASA of two identical space telescopes

The primary mirror of the Roman Space Telescope; one of the two mirrors donated to NASA by the NRO in 2012.<br>In 2012, the United States National Reconnaissance Office (NRO) donated two identical space telescopes to NASA. These telescopes were built under the Future Imagery Architecture program, originally intended to carry out surveillance missions. However, the project was terminated due to cost overruns and delays.

The inherited telescopes have been regarded in the scientific community as having optics on par with Hubble,[1] presenting a significant opportunity for astronomical research (hence the donation to NASA).

Although the telescopes themselves were given to NASA at no cost, the space agency must still pay for the cost of instruments and electronics for the telescopes, as well as the satellites to house them and the launch of the telescopes.

On February 17, 2016, the Nancy Grace Roman Space Telescope (then known as the Wide Field Infrared Survey Telescope or WFIRST) was formally designated as a mission by NASA, predicated on using one of the space telescopes.[2]

Background<br>[edit]

The Hubble Space Telescope launched in 1990.<br>While the Hubble Space Telescope of the National Aeronautics and Space Administration (NASA) has collected a large amount of astronomical data, has outlived all expectations, and has been described as one of the space agency's most successful missions, the facility will eventually succumb to the extreme environment of space.[3] In addition, with the James Webb Space Telescope costing at least US$9 billion, the agency's astrophysics budget is strained. As a result, NASA's other astrophysics missions have been delayed until funding becomes available.[4]

In January 2011 the National Reconnaissance Office (NRO) revealed to NASA the existence of two unneeded telescope optical systems, originally built to be used in reconnaissance satellites, and available to the civilian agency. NASA accepted the offer in August 2011 and announced the donation on 4 June 2012.[5] The instruments were constructed between the late 1990s and early 2000s, reportedly for NRO's unsuccessful Future Imagery Architecture program;[6] in addition to the two completed telescopes, a primary mirror and other parts for a third also exist.[7]

While NRO considers them to be obsolete, the telescopes are nevertheless new and unused. All charge-coupled devices (CCDs) and electronics have been removed, however, and NASA must add them at its own expense. When the telescopes' specifications were presented to scientists, large portions were censored due to national security. An unnamed space analyst stated that the instruments may be a part of the KH-11 Kennen line of satellites which have been launched since 1976, but which have now been largely superseded by newer telescopes with wider fields of view than the KH-11. The analyst stated, however, that the telescopes have "state-of-the-art optics" despite their obsolescence for reconnaissance purposes.[4]

Nancy Grace Roman Space Telescope<br>[edit]

The primary mirror of the Roman telescope<br>The early consensus for the usage of the telescopes was to follow the NASA Astronomy and Astrophysics Decadal Survey of 2010, which lists the Wide Field Infrared Survey Telescope (now renamed the Nancy Grace Roman Space Telescope) as its highest priority.[3][7] Observing in the infrared section of the electromagnetic spectrum, the Nancy Grace Roman Space Telescope will be used to study the role of dark energy in the Universe, as well as to directly image Jupiter-sized extrasolar planets.[8]

The NRO telescope design has several features which make it useful for Roman/WFIRST and superior to the Hubble. The NRO instrument's 2.4-meter (94 in) primary mirror is the same size and quality as the Hubble's.[4][7] With double the mirror diameter of the original WFIRST design, it allows for up to twice the image resolution and gathers four times the light.[8] Unlike civilian telescopes, the NRO instrument also has a steerable secondary mirror for additional precision.[4] The telescope has a much wider field of view than Hubble due to its shorter focal length, allowing it to observe about 100 times the area at any given time as Hubble can.[5] This has led to the donated telescopes' characterization as "Stubby Hubbles".[8] Their obstructed design, however, may make imaging extrasolar planets more challenging,[9] and would be unsuitable for imaging the most distant galaxies at its longest infrared wavelengths, which requires cooling beyond the original NRO design temperature range.[7]

Whether using...