Chamberlin Observatory

Chamberlin Observatory is an astronomical observatory owned and operated by the University of Denver. It is located in Denver, Colorado (US) in Observatory Park. It is named for Humphrey B. Chamberlin, a Denver real estate magnate who pledged $50,000 in 1888 to build and equip the facility.

Chamberlin Observatory

Chamberlin Observatory, circa 1900.
Organization	University of Denver
Observatory code	708
Location	Denver, Denver County, Colorado
Coordinates	39°40′34″N 104°57′11″W
Altitude	1651 meters (5417 feet)
Weather	See the Clear Sky Chart
Established	1890
Website	mysite.du.edu/~rstencel/Chamberlin/
Telescopes
Alvan Clark-George N. Saegmuller 20-inch aperture, f/15 refractor Chamberlin Observatory U.S. National Register of Historic Places Colorado State Register of Historic Properties Show map of Colorado Show map of the United States Location 2930 E. Warren Ave., Denver, Colorado Coordinates 39°40′34″N 104°57′11″W Built 1891 Architect Robert S. Roeschlaub Architectural style Romanesque, Richardsonian Romanesque NRHP reference No. 80000887[1] CSRHP No. 5DV.187 Added to NRHP March 27, 1980
Location of Chamberlin Observatory
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The observatory building was designed by Robert S. Roeschlaub, with the astronomical aspects and functions designed by Professor Herbert Alonzo Howe after he visited many observatories in the east. It was modeled after the Goodsell Observatory at Carleton College in Northfield, Minnesota, and constructed from rusticated red sandstone blocks. The Romanesque structure includes a central rotunda and domed roof. Construction began in 1890.

The 20-inch objective lens for the observatory's main refracting telescope was made by Alvan Clark & Sons, and the mount was built by George Nicholas Saegmuller. The mount rests on a cast iron pillar which is in turn supported by a massive stone pier. Assembly of the telescope was supervised by Professor Herbert Alonzo Howe. The telescope saw first light in 1894.[2][3]

As of 2018, the Denver Astronomical Society hosts several public outreach events at the observatory every month.[4] As it is located in a large metropolitan area, the observatory is heavily affected by light pollution, which limits its use in scientific research.

In the late 19th century, building great refractors was popular, despite their small apertures compared to reflectors. Several failed reflector projects, and the US Naval Observatory's discovery of the Moons of Mars in 1877 using a 26-inch refractor, contributed to this trend. In just ten years the shift towards big reflectors occurred such as with the 60-inch Hale of 1908.