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  2. Fine Guidance Sensor (HST) - Wikipedia

    en.wikipedia.org/wiki/Fine_Guidance_Sensor_(HST)

    From the center to outer edge of the FGS field of view is 14.1 arcminutes [1] This is a diagram of the field of view of each Hubble Space Telescope instrument, including the three FGS instruments (FGS field of view(s) highlighted in yellow) A Fine Guidance Sensor being refurbished between servicing missions SM3A and SM4 A fine guidance sensors in space on STS Servicing Mission 2 in 1997

  3. Astroscan - Wikipedia

    en.wikipedia.org/wiki/Astroscan

    The Astroscan had a Newtonian reflector layout with a 4 + 18 in (10 cm) clear-inch diameter f/4.2 aluminized and overcoated borosilicate glass parabolic primary mirror with a focal length of 17 + 12 inches (44 cm). [1] The telescope's secondary mirror was mounted on a flat optical window at

  4. Bahtinov mask - Wikipedia

    en.wikipedia.org/wiki/Bahtinov_mask

    The telescope is pointed at a bright star, and a mask is placed in front of the telescope's objective (or in front of the aperture). The mask consists of three separate grids, positioned in such a way that the grids produce three angled diffraction spikes at the focal plane of the instrument for each bright image element.

  5. High Speed Photometer - Wikipedia

    en.wikipedia.org/wiki/High_Speed_Photometer

    STS-61 rendezvous with Hubble Space Telescope to replace various items including the High Speed Photometer. The High Speed Photometer (HSP) is a scientific instrument formerly installed on the Hubble Space Telescope. The HSP was designed to measure the brightness and polarity of rapidly varying celestial objects.

  6. Altazimuth mount - Wikipedia

    en.wikipedia.org/wiki/Altazimuth_mount

    In the largest telescopes, the mass and cost of an equatorial mount is prohibitive and they have been superseded by computer-controlled altazimuth mounts. [5] The simple structure of an altazimuth mount allows significant cost reductions, in spite of the additional cost associated with the more complex tracking and image-orienting mechanisms. [6]

  7. Great Observatories program - Wikipedia

    en.wikipedia.org/wiki/Great_Observatories_program

    Four Great Observatories. NASA's series of Great Observatories satellites are four large, powerful space-based astronomical telescopes launched between 1990 and 2003. They were built with different technology to examine specific wavelength/energy regions of the electromagnetic spectrum: gamma rays, X-rays, visible and ultraviolet light, and infrared light.

  8. Lucky imaging - Wikipedia

    en.wikipedia.org/wiki/Lucky_imaging

    Used at a 1% selection or less, lucky imaging can reach the diffraction limit of even 2.5 m aperture telescopes, a resolution improvement factor of at least five over standard imaging systems. Zeta Bootis imaged with the Nordic Optical Telescope on 13 May 2000 using the lucky imaging method.

  9. NIRSpec - Wikipedia

    en.wikipedia.org/wiki/NIRSpec

    The NIRSpec (Near-Infrared Spectrograph) is one of the four scientific instruments flown on the James Webb Space Telescope (JWST). [2] The JWST is the follow-on mission to the Hubble Space Telescope (HST) and is developed to receive more information about the origins of the universe by observing infrared light from the first stars and galaxies.

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