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- Hobby–Eberly_Telescope abstract "The Hobby–Eberly Telescope is a 9.2-meter (30-foot) aperture telescope located at the McDonald Observatory. It combines a number of features that differentiate it from most telescope designs, resulting in greatly lowered construction costs. For instance, the primary mirror is constructed from 91 hexagonal elements, which is less expensive than manufacturing a single large primary. Furthermore the telescope's main mirror is fixed at an 55 degrees angle and can rotate around its base. A target is tracked by moving the instruments at the focus of the telescope; this allows access to about 70–81% of the sky at its location and a single target can be tracked for up to two hours. The telescope is named for former Texas Lieutenant-Governor Bill Hobby and for Robert E. Eberly, a Penn State benefactor.Three instruments are available to analyze the light from the targets. All three instruments are spectrographs. The instruments work at high, medium and low spectral resolution. The low-resolution spectrograph is housed at the prime focus, while the medium and high-resolution spectrographs reside in the basement and the light is fed into them via a fiber-optic cable.Since achieving first light in 1996, the telescope has been used for a wide variety of studies ranging from our Solar System to stars in our galaxy and studies of other galaxies. The telescope has been used successfully to find planets orbiting around other stars by measuring radial velocities as precisely as 1 m/s. Using the low-resolution spectrograph, the telescope has been used to identify Type Ia supernovae to measure the acceleration of the universe. The telescope has also been used to measure the rotation of individual galaxies. The telescope was upgraded for use in the Hobby–Eberly Telescope Dark Energy Experiment (HETDEX), which will provide the first observations to allow narrowing of the list of possible explanations for dark energy.The Hobby–Eberly Telescope is operated by The University of Texas McDonald Observatory for a consortium of institutions which includes The University of Texas at Austin, Pennsylvania State University, Stanford University, Ludwig Maximilians University of Munich, and Georg August University of Göttingen.The physical main reflector mirror is larger than 9.2 meters; it is actually about 11 m by 9.8 m. However, the usable optical aperture at any given time is 9.2 m. The mirror itself is composed of 91 hexagonal segments, a segmented mirror design like the Keck telescopes. Updates to the telescope increased its field of view from 4 arcminutes to 22 arcminutes (a full moon is 30 arcminutes for comparison). The telescope mirrors are aligned within a fraction of a wavelength of visible light by actuators under each segment. The tower next to the telescope, called the Center of Curvature Alignment Sensor Tower (CCAS), is used to calibrate the mirror segments. One of the advantages of this type, is that it was over 5 times more cost efficient for its aperture than a more traditional design.As reported in Nature of 28 November 2012, astronomers have used the Hobby–Eberly Telescope to measure the mass of extraordinarily large black hole (with mass approximates 17 billion Suns), possibly the largest black hole found so far. It has been found in the compact, lenticular galaxy NGC 1277, lies 220 million light-years away in the constellation Perseus. The black hole has approximately 59 percent of the mass of the bulge of this spiral galaxy (14 percent of the total stellar mass of the galaxy).".
- Hobby–Eberly_Telescope thumbnail HET_Dome.jpg?width=300.
- Hobby–Eberly_Telescope wikiPageID "842774".
- Hobby–Eberly_Telescope wikiPageRevisionID "602839805".
- Hobby–Eberly_Telescope angularResolution "≈1.5″ FWHM".
- Hobby–Eberly_Telescope area "64.2".
- Hobby–Eberly_Telescope area "77.6".
- Hobby–Eberly_Telescope built "1994".
- Hobby–Eberly_Telescope caption "--10-28".
- Hobby–Eberly_Telescope diameter "1 m".
- Hobby–Eberly_Telescope diameter "9.2 m".
- Hobby–Eberly_Telescope firstLight "--12-11".
- Hobby–Eberly_Telescope focalLength "13.08 m".
- Hobby–Eberly_Telescope location "Mount Locke, Davis Mountains, West Texas".
- Hobby–Eberly_Telescope mounting "Fixed primary, Arecibo style".
- Hobby–Eberly_Telescope name "Hobby–Eberly Telescope".
- Hobby–Eberly_Telescope organization McDonald_Observatory.
- Hobby–Eberly_Telescope style "Prime focus, segmented".
- Hobby–Eberly_Telescope wavelength "350".
- Hobby–Eberly_Telescope website het.html.
- Hobby–Eberly_Telescope subject Category:Telescopes.
- Hobby–Eberly_Telescope subject Category:University_of_Texas_at_Austin.
- Hobby–Eberly_Telescope point "30.681444444444445 -104.01472222222222".
- Hobby–Eberly_Telescope type SpatialThing.
- Hobby–Eberly_Telescope comment "The Hobby–Eberly Telescope is a 9.2-meter (30-foot) aperture telescope located at the McDonald Observatory. It combines a number of features that differentiate it from most telescope designs, resulting in greatly lowered construction costs. For instance, the primary mirror is constructed from 91 hexagonal elements, which is less expensive than manufacturing a single large primary. Furthermore the telescope's main mirror is fixed at an 55 degrees angle and can rotate around its base.".
- Hobby–Eberly_Telescope label "Hobby-Eberly-Teleskop".
- Hobby–Eberly_Telescope label "Hobby-Eberly-telescoop".
- Hobby–Eberly_Telescope label "Hobby–Eberly Telescope".
- Hobby–Eberly_Telescope label "Telescopio Hobby-Eberly".
- Hobby–Eberly_Telescope label "Telescopio Hobby-Eberly".
- Hobby–Eberly_Telescope label "Teleskop Hobby-Eberly".
- Hobby–Eberly_Telescope label "Télescope Hobby-Eberly".
- Hobby–Eberly_Telescope label "Телескоп Хобби — Эберли".
- Hobby–Eberly_Telescope label "ホビー・エバリー望遠鏡".
- Hobby–Eberly_Telescope label "霍比-埃伯利望远镜".
- Hobby–Eberly_Telescope sameAs Hobby%E2%80%93Eberly_Telescope.
- Hobby–Eberly_Telescope sameAs Hobby-Eberly-Teleskop.
- Hobby–Eberly_Telescope sameAs Telescopio_Hobby-Eberly.
- Hobby–Eberly_Telescope sameAs Télescope_Hobby-Eberly.
- Hobby–Eberly_Telescope sameAs Telescopio_Hobby-Eberly.
- Hobby–Eberly_Telescope sameAs ホビー・エバリー望遠鏡.
- Hobby–Eberly_Telescope sameAs Hobby-Eberly-telescoop.
- Hobby–Eberly_Telescope sameAs Teleskop_Hobby-Eberly.
- Hobby–Eberly_Telescope sameAs Q139605.
- Hobby–Eberly_Telescope sameAs Q139605.
- Hobby–Eberly_Telescope lat "30.681444444444445".
- Hobby–Eberly_Telescope long "-104.01472222222222".
- Hobby–Eberly_Telescope wasDerivedFrom Hobby–Eberly_Telescope?oldid=602839805.
- Hobby–Eberly_Telescope depiction HET_Dome.jpg.
- Hobby–Eberly_Telescope homepage het.html.