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Index Astrograph

An astrograph (astrographic camera) is a telescope designed for the sole purpose of astrophotography. [1]

37 relations: Amateur astronomy, Amateur telescope making, Apochromat, Asteroid, Astrometry, Astrophotography, Blink comparator, BOOTES, Cardinal point (optics), Catadioptric system, Charge-coupled device, Clyde Tombaugh, Coma (optics), Comet, Cooke triplet, Dwarf planet, Ecliptic, F-number, Field flattener lens, Field of view, List of telescope types, Lowell Observatory, Meteoroid, Minute and second of arc, Newtonian telescope, Non-achromatic objective, Nova, Objective (optics), Planet, Pluto, Proper motion, Reflecting telescope, Refracting telescope, Ritchey–Chrétien telescope, Schmidt camera, Stellar classification, Variable star.

Amateur astronomy

Amateur astronomy is a hobby whose participants enjoy observing or imaging celestial objects in the sky using the unaided eye, binoculars, or telescopes.

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Amateur telescope making

Amateur telescope making is the activity of building telescopes as a hobby, as opposed to being a paid professional.

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An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses.

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Asteroids are minor planets, especially those of the inner Solar System.

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Astrometry is the branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies.

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Astrophotography is a specialized type of photography for recording photos of astronomical objects, celestial events, and areas of the night sky.

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Blink comparator

A blink comparator was a viewing apparatus used by astronomers to find differences between two photographs of the night sky.

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BOOTES, the Burst Observer and Optical Transient Exploring System, is a network of astronomical observatories with sites in Southern Spain, New Zealand, China and Mexico (mostly 0.6m diameter telescope with EMCCD camera at the Cassegrain focus and a g'r'i'ZY filterset. The main goal of the network is to quickly observe transient events within few seconds/minutes of being detected by scientific satellites. BOOTES provides an automated real time observing response to the detection of Gamma Ray Bursts GRBs. Error box size depending, it uses wide field cameras (WFC), ultra wide field cameras (UWFC) and narrow field cameras (NFC) attached to small robotic telescopes or the telescopes themselves. To study GRBs it is of the utmost importance to perform prompt optical follow up observations, to detect longer wavelength transient emission associated to them. BOOTES can perform such follow ups. Its scientific objectives include: • Simultaneous and quasi simultaneous observations of GRB error boxes. • Detection of optical flashes of cosmic origin. • All-Sky monitoring with the CASANDRA cameras down to 10th mag every 60 s. • Monitoring of different types of variable objects (galactic or extragalactic) down to 20th mag in order to search for optical variabilitity. • Discovery of comets,, asteroids, variable stars, novae and supernovae. BOOTES is part, within the framework of an international collaboration led by Spain, which started in order to support the ESA’s satellite INTEGRAL with ground-based observations. The project also was focused to perform rapid follow up observations of events detected by several spacecraft (BATSE, BeppoSAX, RossiXTE, IPN, Hete-2, Swift and Fermi). Results in the GRB field are multifold: • Predetection images: they set up upper limits for any possible precursors. • Simultaneous images: the first was achieved last 20 February 2001, although no counterpart was detected. • Follow-up images: with several gamma-ray bursts being discovered or monitored starting several dozen of seconds after the onset of the event.

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Cardinal point (optics)

In Gaussian optics, the cardinal points consist of three pairs of points located on the optical axis of a rotationally symmetric, focal, optical system.

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Catadioptric system

A catadioptric optical system is one where refraction and reflection are combined in an optical system, usually via lenses (dioptrics) and curved mirrors (catoptrics).

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Charge-coupled device

A charge-coupled device (CCD) is a device for the movement of electrical charge, usually from within the device to an area where the charge can be manipulated, for example conversion into a digital value.

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Clyde Tombaugh

Clyde William Tombaugh (February 4, 1906January 17, 1997) was an American astronomer.

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Coma (optics)

In optics (especially telescopes), the coma, or comatic aberration, in an optical system refers to aberration inherent to certain optical designs or due to imperfection in the lens or other components that results in off-axis point sources such as stars appearing distorted, appearing to have a tail (coma) like a comet.

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A comet is an icy small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.

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Cooke triplet

The Cooke triplet is a photographic lens designed and patented (patent number GB 22,607) in 1893 by Dennis Taylor who was employed as chief engineer by T. Cooke & Sons of York.

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Dwarf planet

A dwarf planet is a planetary-mass object that is neither a planet nor a natural satellite.

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The ecliptic is the circular path on the celestial sphere that the Sun follows over the course of a year; it is the basis of the ecliptic coordinate system.

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The f-number of an optical system (such as a camera lens) is the ratio of the system's focal length to the diameter of the entrance pupil.

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Field flattener lens

Field flattener lens is a type of lens used in modern binocular designs (e.g. Canon 10 x 42 L IS WP, 18 x 50 IS All Weather and Swarovski EL 8.5 x 42, EL 10 x 42) and in astronomic telescopes.

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Field of view

The field of view is the extent of the observable world that is seen at any given moment.

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List of telescope types

The following are lists of devices categorized as types of telescopes or devices associated with telescopes.

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Lowell Observatory

Lowell Observatory is an astronomical observatory in Flagstaff, Arizona, United States.

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A meteoroid is a small rocky or metallic body in outer space.

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Minute and second of arc

A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.

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Newtonian telescope

The Newtonian telescope, also called the Newtonian reflector or just the Newtonian, is a type of reflecting telescope invented by the English scientist Sir Isaac Newton (1642–1727), using a concave primary mirror and a flat diagonal secondary mirror.

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Non-achromatic objective

A non-achromatic objective is an objective lens which is not corrected for chromatic aberration.

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A nova (plural novae or novas) or classical nova (CN, plural CNe) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star, that slowly fades over several weeks or many months.

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Objective (optics)

In optical engineering, the objective is the optical element that gathers light from the object being observed and focuses the light rays to produce a real image.

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A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.

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Pluto (minor planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond Neptune.

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Proper motion

Proper motion is the astronomical measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant stars.

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Reflecting telescope

A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image.

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Refracting telescope

A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope).

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Ritchey–Chrétien telescope

A Ritchey–Chrétien telescope (RCT or simply RC) is a specialized variant of the Cassegrain telescope that has a hyperbolic primary mirror and a hyperbolic secondary mirror designed to eliminate off-axis optical errors (coma).

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Schmidt camera

A Schmidt camera, also referred to as the Schmidt telescope, is a catadioptric astrophotographic telescope designed to provide wide fields of view with limited aberrations.

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Stellar classification

In astronomy, stellar classification is the classification of stars based on their spectral characteristics.

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Variable star

A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.

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[1] https://en.wikipedia.org/wiki/Astrograph

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