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English: The High Energy Focusing Telescope (HEFT) is a balloon-borne instrument carrying one of the first focusing telescopes for the hard X-ray band (20–70 keV). It makes use of tungsten-silicon multilayer coatings to extend the reflectivity of nested grazing-incidence mirrors beyond 10 keV. HEFT has an angular resolution of 1.5 arcminutes in half-power diameter, and an energy resolution of 1.0 keV full width at half maximum at 60 keV. HEFT was launched for a 25-hour balloon flight on May 2005. The instrument performed within specification, and observed Cyg X-1, the Crab Nebula.
한국어: 이 파일의 한국어 버전이 있습니다: File:800crab-ko.png
Date
Source High Energy Focusing Telescope (HEFT), NASA's Scientific Ballooning Program
Author CM Hubert Chen, Fiona A. Harrison, Principal Investigator, Caltech Charles J. Hailey, Columbia Principal, Columbia, Finn E. Christensen, DSRI Principal, DSRI, William W. Craig, Optics Scientist, LLNL, Stephen M. Schindler, Project Manager, Caltech
Permission
(Reusing this file)		 Images produced by NASA are usually free of copyright [...]

This is the Crab Nebula in various energy bands, including a hard X-ray image from the HEFT data taken during its 2005 observation run. The angular resolution of HEFT is about 1.5′. Each image is 6′ wide.

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Date/TimeThumbnailDimensionsUserComment
current09:56, 12 August 2012Thumbnail for version as of 09:56, 12 August 2012879 × 679 (232 KB)LucquessoyReverted to version as of 16:10, 13 September 2009
09:55, 12 August 2012Thumbnail for version as of 09:55, 12 August 20121,026 × 763 (409 KB)LucquessoyTranslation of terms into the Arabic.
16:10, 13 September 2009Thumbnail for version as of 16:10, 13 September 2009879 × 679 (232 KB)Marshallsumter{{Information |Description={{en|1=The High Energy Focusing Telescope (HEFT) is a balloon-borne instrument carrying one of the first focusing telescopes for the hard X-ray band (20–70 keV). It makes use of tungsten-silicon multilayer coatings to extend t

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