| Green Bank Telescope | |
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| Organization | NRAO |
|---|---|
| Location | Green Bank, West Virginia, USA |
| Coordinates | Coordinates: |
| Wavelength | radio |
| Built | 1991-2002 |
| First light | August 22, 2000 |
| Telescope style | Parabolic off-axis reflector, Gregorian optics |
| Diameter | 100m |
| Collecting area | 7,854m2 |
| Focal length | 60 m |
| Mounting | wheel and track mount |
| Website | www.gb.nrao.edu/GBT/GBT.shtml |
The Robert C. The National Radio Astronomy Observatory (NRAO is a Federally Funded Research and Development Center of the United States National Science Foundation operated Green Bank is a community in Pocahontas County in West Virginia 's Potomac Highlands inside the Allegheny Mountain Range. The United States of America —commonly referred to as the A geographic coordinate system enables every location on the Earth to be specified in three coordinates using mainly a spherical coordinate system. In Physics wavelength is the distance between repeating units of a propagating Wave of a given Frequency. Radio is the transmission of signals by Modulation of electromagnetic waves with frequencies below those of visible Light. Events 392 - Arbogast has Eugenius elected Western Roman Emperor. The year 2000 in Science and Technology involved some significant events The Gregorian telescope is a type of Reflecting telescope designed by Scottish Mathematician and Astronomer, James Gregory in the The focal length of an optical system is a measure of how strongly it converges (focuses or diverges (diffuses Light. A telescope mount is a mechanical structure which supports a Telescope. Byrd Green Bank Telescope (GBT) is the world's largest fully steerable radio telescope and the world's largest land-based movable structure. A radio telescope is a form of directional Radio antenna used in Radio astronomy and in tracking and collecting data from Satellites It is part of the National Radio Astronomy Observatory (NRAO) site at Green Bank, West Virginia (USA). The National Radio Astronomy Observatory (NRAO is a Federally Funded Research and Development Center of the United States National Science Foundation operated Green Bank is a community in Pocahontas County in West Virginia 's Potomac Highlands inside the Allegheny Mountain Range. West Virginia ( is a state in the Appalachian Upland South, and Mid-Atlantic regions of the United States, bordered by The United States of America —commonly referred to as the The telescope honors the name of Senator Robert C. Byrd. Robert Carlyle Byrd (born November 20 1917 is the senior United States Senator from West Virginia and a member of the Democratic Party.
The telescope was built following the collapse of the previous Green Bank telescope, a 300ft paraboloid. In Mathematics, a paraboloid is a Quadric surface of special kind This telescope collapsed on 15 November 1988 due to the sudden loss of a gusset plate in the box girder assembly, which was a key component for the structural integrity of the telescope. Events 655 - Battle of Winwaed: Penda of Mercia is defeated by Oswiu of Northumbria. The year 1988 in Science and Technology involved many significant events some listed below A gusset is a device often triangular, used to reinforce a connection between two components [1]
Contents |
Location
The telescope sits at the heart of the United States National Radio Quiet Zone, a large area where all radio transmissions are either limited or banned outright, to help the telescope function properly. The United States National Radio Quiet Zone is a large area of land surrounding the National Radio Astronomy Observatory (NRAO near Green Bank, West Virginia
Description[2]
The surface area of the GBT is 100 by 110 meters with 2,209 actuators (a small motor used to adjust the position) for the 2,004 surface panels. The panels are made from aluminium to a surface accuracy of less than 0. WikipediaNaming 003 inches (76. 2 micrometers) RMS. In Mathematics, the root mean square (abbreviated RMS or rms) also known as the quadratic mean, is a statistical measure of the The actuators adjust the panel positions to correct for distortions due to gravity which change as the telescope moves. Without this so-called "active surface", observations at frequencies above 4 GHz would not be as accurate.
The telescope is unusual in that the mirror is not a symmetrical dish, but is a section of a much larger parabolic figure with the receiver where the prime focus of the entire mirror would be. In Mathematics, the parabola (pəˈræbələ from the Greek παραβολή) is a Conic section, the intersection of a right circular In Geometrical optics, a focus, also called an image point, is the point where Light rays originating from a point on the object converge. As a result, the support for the receiver does not in any way obscure the mirror's view of the sky.
The offset support "arm" houses a retractable prime focus feed horn in front of the 8 m subreflector and eight higher-frequency feeds on a rotating turret at the Gregorian focus. In Satellite dish and antenna design parlance a feedhorn (or feed horn) is a Horn antenna used to convey Radio waves between the A secondary mirror (or secondary) is a second light gathering and focusing surface in a Reflector telescope. The Gregorian telescope is a type of Reflecting telescope designed by Scottish Mathematician and Astronomer, James Gregory in the Operational frequencies range from 290 MHz to 49. 8 GHz.
The telescope is equipped with a special laser system where beams of light are reflected inside the dish. Monitoring of these beams shows how the telescope image may be distorted by gravity, wind, etc. This shows the researchers how to adjust the surfaces to make up for the distortion. [3]
Image Gallery
 The GBT from the distance of the NRAO visitor's center |
 The GBT with people for scale |
 Azimuth track which supports the weight of the entire telescope |
 Close-up of the azimuth track |
 Underneath the GBT dish |
 Altitude wheel and track |
 Counterweights on the altitude track |
 Painter painting the GBT structure |
 Elevator to the receiver room |
 Prime focus receiver in front of the secondary reflector |
 Feed horns for various receivers |
See also
References
- ^ NRAO 300 foot Telescope Home Page
- ^ Toney Minter (May 2007). This is a list of Radio telescopes that are or have been used for Radio astronomy. The Proposer’s Guide for the Green Bank Telescope (PDF). NRAO. Retrieved on 2007-07-14. Year 2007 ( MMVII) was a Common year starting on Monday of the Gregorian calendar in the 21st century. Events 1223 - Louis VIII becomes King of France upon the death of his father Philip II of France.
- ^ The Robert C. Byrd Green Bank Telescope
External links
- Official site
- Aerial photo that happened to catch telescope while it was under construction
- Collection of West Virginia photos including Green Bank from davidmetraux. com
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