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An astrograph (astrographic camera) is a telescope designed for the sole purpose of astrophotography. Astrographs are usually used in wide field surveys of the night sky as well as detection of objects such as asteroids, meteors, and comets.
Most research telescopes in this class are refractors, although there are many (usually larger) reflecting designs such as the Ritchey-Chrétien and catadioptrics such as the Schmidt camera. The main parameters of an Astrograph are the diameter and f-ratio of the objective, which determine the field of view and image scale on the photographic plate or CCD detector. The objective of an astrograph is usually not very large, on the order of 20 to 50 cm (8 to 20 in).
The shape of the focal plane is often designed to work in conjunction with a specific shaped photographic plate or CCD detector. The objective is designed to produce a particularly large (for example, 17 by 17 inches (430 mm × 430 mm)), flat, and distortion-less image at the focal plane. They may even be designed to focus certain wavelengths of light to match the type of film they are designed to use (early astrographs were corrected to work in blue wavelengths to match photographic emulsions of the time).
Wide-angle astrographs with short f-ratios are used for photographing a huge area of sky. Astrographs with higher f-ratios are used in more precise measurements. Many observatories of the world are equipped with the so-called normal astrographs with an aperture of around 13 inches (330 mm) and a focal length of 11 feet (3.4 m). The purpose of a "normal astrograph" is to create images where the scale of the image at the focal plane is a standard of approximately 60 arcsecs/mm.
Astrographs used in astrometry record images that are then used to "map" the positions of objects over a large area of the sky. These maps are then published in catalogs to be used in further study or to serve as reference points for deep-space imaging.
Astrographs used for stellar classification sometimes consist of two identical telescopes on the same mount (a double astrograph). Each sky field can be simultaneously photographed in two colors (usually blue and yellow). Each telescope may have individually designed non-achromatic objectives to focus the desired wavelength of light which is paired with the respective color-sensitive (black-and-white) photographic plate. In other cases a single telescope is used to make two exposures of the same part of the sky with different filters and color sensitive film used on each exposure. Two-color photography lets astronomers measure the color, as well as the brightness (magnitude), of each star imaged. Colors tell the star's "temperature”. Knowing the color type and magnitudes lets astronomers determine the distance of a star. Sky fields that are photographed twice, decades apart in time, will reveal a nearby star's proper motion when measured against the background of distant stars or galaxies.
Discovery of astronomical objects
By taking two exposures of the same section of the sky days or weeks apart, it is possible to find objects such as asteroids, meteors, comets, variable stars, novae, and even unknown planets. By comparing the pair of images, using a device such as a blink comparator, astronomers are able to find objects that moved or changed brightness between the two exposures or simply appear in one image only, as in the case of a nova or meteor. Sometimes objects can even be found in one exposure since a fast moving object will appear as a "line" in a long exposure.
One well-known case of an astrograph used in a discovery is Clyde Tombaugh’s discovery of the dwarf planet Pluto in 1930. Tombaugh was given the job of hunting for a suspected "9th planet" to be achieved by systematically photographing the area of the sky around the ecliptic. Tombaugh used Lowell Observatory's 13-inch (330 mm) (3 lens element), f/5.3 refractor astrograph, which recorded images on 14-by-17-inch (360 mm × 430 mm) glass plates.
Use in amateur astrophotography
In the amateur astronomy field there are many types of commercial and amateur built telescopes designed for astrophotography labeled "astrographs". Optical designs of amateur astrographs vary widely but include apochromatic refractors, variations of Cassegrain reflectors including Ritchey-Chretien and Dall-Kirkham designs, or Newtonian reflectors. Most optical designs do not produce large, flat, and well-corrected imaging fields and therefore require some type of optical correction by way of field flatteners or coma correctors. Amateur astrographs typically have purpose-built focusers, are constructed of thermally stable materials like carbon fiber and are paired with heavy duty mounts to facilitate accurate tracking of deep sky objects for long periods of time.
- Tombaugh, Clyde (1995-04-05). The Struggles to Find the Ninth Planet. NASA/JPL Outer Planets/Solar Probe Project, 5 April 1995. Retrieved from http://ircamera.as.arizona.edu/NatSci102/NatSci102/text/ext9thplanet.htm.
- The Double Astrograph of the Yale Southern Observatory
- The Carnegie Double Astrograph
- Pluto Imaging Challenge: Images
- Construction of the Tycho Reference Catalogue - 2 Source Catalogues
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