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| Location | Southold, New York |
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| Coordinates | 41°03′07″N 72°26′04″W / 41.0519°N 72.4345°W / 41.0519; -72.4345 |
| Website | www |
  Location of Custer Observatory | |
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Custer Observatory is an astronomical observatory located in Southold, New York. It is owned and operated by the Custer Institute. Facing Peconic Bay and Shelter Island, Custer's location is host to some of the darkest skies on Long Island as a result of the comparatively lower levels of light pollution in the area.[1]
The Custer Institute is Long Island's oldest public observatory, and was founded in 1927 by Charles Wesley Elmer (co-founder of the Perkin-Elmer Optical Company) and fellow amateur astronomers. The name was adopted to honor the hospitality of Mrs. Elmer, the grand-niece of General George Armstrong Custer. In 1942, the Custer Institute was incorporated as a non-profit educational corporation in the State of New York.
In 1938, the group purchased the land the institute presently occupies. The initial construction of the observatory was completed in the spring of 1939. A 100-seat lecture hall was added in 1945. A three-story tower, library and observatory dome were built in 1947. A shed housing three sliding-roof observatories was built for the institute in 1954.
Over the years, Custer has acquired a large collection of telescopes of all sizes and descriptions. Most recently,[when?] Custer acquired a 10" refracting telescope. Custer's telescope is the largest of its type in the United States. This telescope is in the main observatory dome.
Custer's 10” refracting telescope was manufactured in England. The telescope's dialyte lenses make it apochromatic, providing enhanced views of the solar system and deep space objects. The folded light path construction uses mirrors to reduce the telescope's size, allowing the long f/12 focal length telescope to fit in Custer's dome.
The telescope is attached to a computer-controlled Fornax 152 equatorial mount, permitting easy aiming and object tracking. The entire assembly can be raised/lowered on the Pier-Tech pier to accommodate most users’ heights for comfortable viewing.
Previously, the dome was home to a 25-inch (f/5) reflector. To bring the eyepiece of this telescope to a level that does not require observers to climb a high ladder, the optics on this telescope were modified by Justine Haupt, an engineer at Brookhaven National Lab.
The Custer Library contains a number of astronomy and science books dating from the 19th century to the present. It also houses the institute's videotape and 35mm astronomical slide collections. It contains National Geographic, Sky & Telescope, Astronomy, and Scientific American magazines dating back numerous decades. Membership to the Custer Institute grants access to their library.
The Custer Institute Exhibit Room contains the following in its collection:
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Astronomical observatories of New York
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Astronomy
Stars
Spaceflight
Outer space
Solar System
Education
Science
