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  2. Whirlpool Galaxy - Wikipedia

    en.wikipedia.org/wiki/Whirlpool_Galaxy

    The Whirlpool Galaxy, also known as Messier 51a (M51a) or NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus. [ 6 ] [ 7 ] [ 8 ] It lies in the constellation Canes Venatici , and was the first galaxy to be classified as a spiral galaxy. [ 9 ]

  3. NGC 5195 - Wikipedia

    en.wikipedia.org/wiki/NGC_5195

    NGC 5195 (also known as Messier 51b or M51b) is a dwarf galaxy that is interacting with the Whirlpool Galaxy (also known as M51a or NGC 5194). Both galaxies are located approximately 25 million light-years away in the constellation Canes Venatici .

  4. GoTo (telescopes) - Wikipedia

    en.wikipedia.org/wiki/GoTo_(telescopes)

    After alignment the telescope mount will then know its orientation with respect to the night sky, and can point to any right-ascension and declination coordinates. When the user selects an object to view, the mount's software looks up the object's right ascension and declination and slews (moves) to those coordinates. To track the object so ...

  5. Telescope mount - Wikipedia

    en.wikipedia.org/wiki/Telescope_mount

    This mount is an alternative to the altazimuth mount that has the advantage of not having a blind spot near the zenith, and for objects near the celestial equator the field rotation is minimized. [7] It has the disadvantage of having all the mass, complexity, and engineering problems of its equatorial counterpart, so is only used in specialty ...

  6. Barn door tracker - Wikipedia

    en.wikipedia.org/wiki/Barn_door_tracker

    A barn door tracker, also known as a Haig or Scotch mount, is a device used to cancel out the diurnal motion of the Earth for the observation or photography of astronomical objects. It is a simple alternative to attaching a camera to a motorized equatorial mount. [1]

  7. Messier 51 - Wikipedia

    en.wikipedia.org/?title=Messier_51&redirect=no

    Language links are at the top of the page across from the title.

  8. Messier 81 - Wikipedia

    en.wikipedia.org/wiki/Messier_81

    Messier 81 (also known as NGC 3031 or Bode's Galaxy) is a grand design spiral galaxy about 12 million light-years away in the constellation Ursa Major. It has a D 25 isophotal diameter of 29.44 kiloparsecs (96,000 light-years ).

  9. Cold camera photography - Wikipedia

    en.wikipedia.org/wiki/Cold_camera_photography

    Guerra Cryogenic Camera ad in May, 1974 Sky & Telescope. Cold camera photography is a technique used by astrophotographers to reduce the electronic noise that accumulates during long exposures with the electronic sensors in DSLRs and dedicated CMOS or CCD astro-cameras. Cooling is usually accomplished with a Peltier thermo-electric cooler.

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