Information about Equatorial Mount
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A large German Equatorial Mount on the Forststernwarte Jena 50cm Cassegrain reflector telescope.
An equatorial mount is a mount used for moving a telescope or camera along two perpendicular axes of motion known as right ascension and declination. Equatorial mounts are often equipped with a motor drive for automatic tracking of objects across the night sky. They may also be equipped with setting circles to allow for the location of objects by their celestial coordinates.
The advantage of an equatorial mount lies in its ability to track an object moving across the sky using constant speed movement around only one axis, unlike an altazimuth mount, which requires variable speed motion around both axes to track the diurnal motion. Also, for astrophotography, the image does not rotate in the focal plane, as occurs with altazimuth mounts when they are guided to track the target's motion, unless a rotating erector prism is installed (or other field-derotator).
The telescope mount's axis of right ascension should be pointed directly towards whichever celestial pole is above the horizon. This polar alignment is dependent on the location of the observer and corresponds with the latitude of the observer's location. Once aligned, the right ascension axis is parallel to the Earth's axis of rotation and celestial objects can be tracked without actuating the declination axis.
English mount
The English mount system is like a big +-sign. The right ascension axis is supported at both ends, and the declination axis is attached to it at approximately mid point.The telescope is placed on one end of the declination axis, and a suitable counterweight on other end of it.
German mount
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A German mount designed for medium-sized amateur telescopes. The right ascension axis runs from bottom right to top left, and the declination axis from bottom left (with counterweights) to top right.
In the German mount the primary structure is a T-shape, where the lower bar is the right ascension axis, and the upper bar is the declination axis. The right ascension axis has bearings below the T-joint, that is, it is not supported above the declination axis.
The telescope is placed on one end of the declination axis, and suitable counterweight on other end of it.
This is most common type of telescope mounts, and many amateur telescopes from 60 mm (2.4") refractors to 14" Schmidt-Cassegrain telescopes are mounted on this mount.
English fork
In English Fork there is a frame that has right ascension axis bearings at the top and the bottom ends, and the declination axis is at its approximate midpoint. The telescope is fitted entirely inside the fork (or not, as is the case with Mt. Wilson 2.5 m reflector) and there are no counterweights like german mount has.Original english fork has the disadvantage of being blocked by the frame from pointing to near north (or south) pole of the sky. For example the Hale telescope is an english fork even though the north end has been changed into huge horse shoe so that it can point to north pole.
Open fork
Most modern mass-produced catadioptric reflecting telescopes (200 mm or larger diameter) tend to be of this type. The mount resembles an Altazimuth mount, but with the azimuth axis is tilted and lined up to match earth rotation axis with a piece of hardware usually called a "wedge."Many mid-size professional telescopes also have equatorial forks, these are usually in range of 0.5-2.0 meter diameter.
See also
In astronomy, the telescope mount is an important part of the overall design of an operational telescope. Many sorts of mounts have been developed over the years, with the majority of effort being put into systems that can track the motion of the stars as the Earth rotates with a
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A telescope is an instrument designed for the observation of remote objects and the collection of electromagnetic radiation. The earliest known telescopes are credited to three individuals, Hans Lippershey and Zacharias Janssen, spectacle-makers in Middelburg, and Jacob Metius of
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camera is a device used to capture images, as still photographs or as sequences of moving images (movies or videos). The term as well as the modern-day camera evolved from the camera obscura
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perpendicular (or orthogonal) to each other if they form congruent adjacent angles. The term may be used as a noun or adjective. Thus, referring to Figure 1, the line AB is the perpendicular to CD through the point B.
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coordinate system is a system for assigning an n-tuple of numbers or scalars to each point in an n-dimensional space. "Scalars" in many cases means real numbers, but, depending on context, can mean complex numbers or elements of some other commutative ring.
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Right ascension (abbrev. RA; symbol α) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. The other coordinate is the declination.
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In astronomy, declination (abbrev. dec or δ) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle.
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Setting circles are used on telescopes equipped with an equatorial mount to find astronomical objects in the sky by their equatorial coordinates often used in star charts or ephemeris.
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In astronomy, a celestial coordinate system is a coordinate system for mapping positions in the sky. There are different celestial coordinate systems each using a coordinate grid projected on the celestial sphere, in analogy to the geographic coordinate system used on the surface
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Altazimuth or alt-azimuth mount is a simple mount used for moving a telescope, camera, helostatic mirror, or solar panel along two perpendicular axes of motion, one vertical and one horizontal.
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Diurnal motion is an astronomical term referring to the apparent daily motion of stars around the Earth, or more precisely around the two celestial poles. It is caused by the Earth's rotation on its axis, so every star apparently moves on a circle, that is called the
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Astrophotography is a specialized type of photography that entails making photographs of astronomical objects in the sky such as the Moon, Sun, planets, stars, and deep sky objects such as star clusters and galaxies.
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The north and south celestial poles are the two imaginary points in the sky where the Earth's axis of rotation, "infinitely extended", intersects the imaginary rotating sphere of stars called the celestial sphere.
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equator divides the planet into a Northern Hemisphere and a Southern Hemisphere, and has a latitude of 0. Latitude, usually denoted symbolically by the Greek letter phi, , gives the location of a place on Earth north or south of the equator.
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EARTH was a short-lived Japanese vocal trio which released 6 singles and 1 album between 2000 and 2001. Their greatest hit, their debut single "time after time", peaked at #13 in the Oricon singles chart.
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sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant star are both overhead. At time 2, the planet has rotated 360° and the distant star is overhead again but the Sun is not (1→2 = one sidereal day).
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In astronomy, the telescope mount is an important part of the overall design of an operational telescope. Many sorts of mounts have been developed over the years, with the majority of effort being put into systems that can track the motion of the stars as the Earth rotates with a
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The Schmidt-Cassegrain is a catadioptric telescope. It combines a folded optical path with a corrector plate to make a compact astronomical instrument.
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Invention and Design
The Schmidt-Cassegrain is a design based on Bernhard Schmidt's Schmidt camera...... Click the link for more information.
Mount Wilson Observatory
The 100 inch Hooker telescope that Edwin Hubble used to discover the general expansion of the universe.
Organization: Carnegie Institution of Washington
Location: Mount Wilson, Los Angeles County, California
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The 100 inch Hooker telescope that Edwin Hubble used to discover the general expansion of the universe.
Organization: Carnegie Institution of Washington
Location: Mount Wilson, Los Angeles County, California
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The Hale Telescope is the largest telescope at the Palomar Observatory. The 200-inch (5-m) telescope is named after George Ellery Hale. Hale supervised the building of the telescopes at the Mount Wilson Observatory with grants from the Carnegie Institution of Washington: the
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In surveillance "catadioptric" refers to catadioptric sensors.
A catadioptric optical system is one which contains both lenses and mirrors.
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Altazimuth or alt-azimuth mount is a simple mount used for moving a telescope, camera, helostatic mirror, or solar panel along two perpendicular axes of motion, one vertical and one horizontal.
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An equatorial room, in astronomy, was a term used to describe the room which contained and equatorial mounted telescope in an observatory. An equatorial mount is a mount having two axes of motion. One is parallel to the Earth's axis and the other is at a right angle to it.
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A telescope is an instrument designed for the observation of remote objects and the collection of electromagnetic radiation. The earliest known telescopes are credited to three individuals, Hans Lippershey and Zacharias Janssen, spectacle-makers in Middelburg, and Jacob Metius of
..... Click the link for more information.
..... Click the link for more information.
In astronomy, the telescope mount is an important part of the overall design of an operational telescope. Many sorts of mounts have been developed over the years, with the majority of effort being put into systems that can track the motion of the stars as the Earth rotates with a
..... Click the link for more information.
..... Click the link for more information.
Altazimuth or alt-azimuth mount is a simple mount used for moving a telescope, camera, helostatic mirror, or solar panel along two perpendicular axes of motion, one vertical and one horizontal.
..... Click the link for more information.
..... Click the link for more information.
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