Allegheny Observatory


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Allegheny Observatory

An observatory sited in Riverview Park, in the city of Pittsburgh, Pennsylvania, USA, and operated by the Physics and Astronomy Department of the University of Pittsburgh. Founded in 1859, the observatory was taken over by the university in 1867 and was fully established on its present site by 1912. The observatory has three telescopes housed in three separate domes. The Fitz-Clark Refractor, a 33.02-centimeter instrument, was the observatory's original telescope, purchased in 1861; it has a focal length of 4.62 meters and a focal ratio of f/14. The William Thaw Memorial Refractor (aperture 76.2 cm, focal length 14.3 m, focal ratio f/18.8) was built in 1912 and designed for photographic work. In 1985 its object lens was upgraded to focus red light, a region of the spectrum in which the Pittsburgh skies are still relatively clear. The James E. Keeler Memorial Reflector (aperture 73.7 cm, focal length 4.56 m, focal ratio f/6) is the observatory's main instrument. Built in 1905 as a Cassegrain telescope, it was originally used for spectroscopy. In 1992 its mirrors were replaced with ones made from a Russian version of Cer-Vit and its optics were upgraded to an f/15 Ritchey–Chrétien system (see Ritchey–Chrétien optics). Among the observatory's other instruments is a nulti-channel astrometric photometer (MAP), designed by George A. Gatewood, the institution's director from 1977. The Allegheny Observatory is today a world leader in high-precision astrometry. Its measurements are being used most significantly in the search for extrasolar planetary systems.
References in periodicals archive ?
His exalted descriptions of what he saw in his scopes were what attracted me to 1001 Celestial Wonders when I first saw a copy in the Allegheny Observatory library in Pittsburgh over half a century ago.
The video came from a NASA camera located at Allegheny Observatory near Pittsburg, PA.
is what a pleased mother of a twelve-year-old son heard after seeing the film UNDAUNTED: The Forgotten Giants of the Allegheny Observatory.
The American astronomer and aviation pioneer Samuel Pierpont Langley (1834-1906), director of the Allegheny Observatory, spotted the planet seconds before it entered onto the solar disk on 1878 May 6.
Gatewood of the University of Pittsburgh's Allegheny Observatory, and Inwoo Han of the Korea Astronomy Observatory in Kyung-Book.
From old photographs taken of Lalande 21185 at the Allegheny Observatory from 1930 through 1984, Gatewood calculated one planet could orbit the star at 10 times Earth's distance from the sun.
It's sort of the Planet-of-the-Month Club,'' joked George Gatewood, a planet hunter at the University of Pittsburgh's Allegheny Observatory.
We turned over prints of lightning photographed by Brashear in June 1894, the company's exhibit at the World's Columbian Exposition dated 1892, Brashear's famous spectrograph attached to the tailpiece of the 30-inch Thaw refractor at Allegheny Observatory, and more.
Gatewood, director of the University of Pittsburgh's Allegheny Observatory, announced the tentative results this week at a meeting of the American Astronomical Society in Madison, Wis.
Discovery of the newest planet was announced by astronomer George Gatewood of the University of Pittsburgh's Allegheny Observatory.
GEORGE GATEWOOD is a professor of astronomy at the University of Pittsburgh and director of Allegheny Observatory.
Castelaz of the University of Pittsburgh's Allegheny Observatory decided to investigate further.

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