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  2. Corrective Optics Space Telescope Axial Replacement

    en.wikipedia.org/wiki/Corrective_Optics_Space...

    The Corrective Optics Space Telescope Axial Replacement (COSTAR) is an optical correction instrument designed and built by NASA. It was created to correct the spherical aberration of the Hubble Space Telescope ' s primary mirror , which incorrectly focused light upon the Faint Object Camera (FOC), Faint Object Spectrograph (FOS), and Goddard ...

  3. STS-61 - Wikipedia

    en.wikipedia.org/wiki/STS-61

    The primary task of the EVA was to replace HST's High Speed Photometer (HSP) with the Corrective Optics Space Telescope Axial Replacement (COSTAR) system which would correct HST's spherical aberration of the main mirror for all instruments except the WFPC2 camera, which had its own built-in corrective optics. Akers received a go for the opening ...

  4. Optical Telescope Element - Wikipedia

    en.wikipedia.org/wiki/Optical_Telescope_Element

    The mirror assembly from the front with primary mirrors attached, November 2016 The secondary mirror being cleaned with carbon dioxide snow. Optical Telescope Element (OTE) is a sub-section of the James Webb Space Telescope, a large infrared space telescope launched on 25 December 2021, [1] consisting of its main mirror, secondary mirrors, the framework and controls to support the mirrors, and ...

  5. Hubble Space Telescope - Wikipedia

    en.wikipedia.org/wiki/Hubble_Space_Telescope

    The Hubble Space Telescope (HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned as a vital research tool and as a public relations boon for astronomy.

  6. Three-mirror anastigmat - Wikipedia

    en.wikipedia.org/wiki/Three-mirror_anastigmat

    The James Webb Space Telescope is a three-mirror anastigmat featuring an ellipsoidal primary, hyperboloidal secondary, and ellipsoidal tertiary. [8] The Euclid mission uses a Korsch telescope. The "Cambridge University Three-Mirror Telescope". project includes a 100 mm working model built in 1985 and a 500 mm prototype built in 1986.

  7. Wide Field and Planetary Camera 2 - Wikipedia

    en.wikipedia.org/wiki/Wide_Field_and_Planetary...

    WFPC2 contains internal corrective optics to fix the spherical aberration in the Hubble telescope's primary mirror. The charge-coupled devices (CCDs) in the WFPC2 (designed at JPL and manufactured by Loral) detected electromagnetic radiation in a range from 120 nm to 1000 nm.

  8. Liquid-mirror space telescope - Wikipedia

    en.wikipedia.org/wiki/Liquid-mirror_space_telescope

    creating the telescope while the reflective surface is liquid, but depending on cooling effects to solidify the surface and then using that as the telescope main mirror. The concept is seen as an enabler of very large optical space telescopes, as a liquid mirror would be much cheaper to construct than a conventional glass mirror of comparable ...

  9. First-surface mirror - Wikipedia

    en.wikipedia.org/wiki/First-surface_mirror

    Technicians assemble 6 of the 18 first-surface mirrors used in the James Webb Space Telescope. A first-surface mirror or front-surface mirror (also commonly abbreviated FS mirror or FSM) is a mirror with the reflective surface being above a backing, as opposed to the conventional, second-surface mirror with the reflective surface behind a ...