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Chandra X-ray Observatory
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==Instruments== The Science Instrument Module (SIM) holds the two focal plane instruments, the [[Advanced CCD Imaging Spectrometer]] (ACIS) and the [[High Resolution Camera]] (HRC), moving whichever is called for into position during an observation. ACIS consists of 10 [[Charge-coupled device|CCD]] chips and provides images as well as [[spectroscopy|spectral]] information of the object observed. It operates in the [[photon energy]] range of 0.2β10 [[keV]]. The HRC has two [[micro-channel plate]] components and images over the range of 0.1β10 keV. It also has a time resolution of 16 [[microsecond]]s. Both of these instruments can be used on their own or in conjunction with one of the observatory's two [[Diffraction grating|transmission gratings]]. The transmission gratings, which swing into the optical path behind the mirrors, provide Chandra with high resolution spectroscopy. The [http://space.mit.edu/HETG/ High Energy Transmission Grating Spectrometer] (HETGS) works over 0.4β10 keV and has a [[spectral resolution]] of 60β1000. The [[Low Energy Transmission Grating Spectrometer]] (LETGS) has a range of 0.09β3 keV and a resolution of 40β2000. Summary:<ref>{{cite web |url=http://chandra.si.edu/about/science_instruments.html |title=Science Instruments |publisher=Center for Astrophysics {{!}} Harvard & Smithsonian |access-date=November 17, 2016 }}</ref> * High Resolution Camera (HRC) * [[Advanced CCD Imaging Spectrometer]] (ACIS) * High Energy Transmission Grating Spectrometer (HETGS) * Low Energy Transmission Grating Spectrometer (LETGS)
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