This article needs additional citations for verification. (February 2013) (Learn how and when to remove this template message)
The Smithsonian Astrophysical Observatory (SAO) is a research institute of the Smithsonian Institution headquartered in Cambridge, Massachusetts, where it is joined with the Harvard College Observatory (HCO) to form the Harvard–Smithsonian Center for Astrophysics (CfA).
The SAO was founded in 1890 by Samuel Pierpont Langley, the Smithsonian's third Secretary, primarily for studies of the sun. Langley is remembered today as an aeronautical pioneer, but he was trained as an astronomer and was the first American scientist to perceive "astrophysics" as a distinct field. Langley invented the bolometer and discovered infrared radiation from the sun.
In 1955, the SAO moved from Washington, D.C. to Cambridge, Massachusetts to affiliate with the Harvard College Observatory (HCO). The merger allowed the institution to expand staff, facilities, and scientific scope. Fred Whipple, the first director of SAO in this new era, accepted a national challenge to create a worldwide satellite-tracking network, a decision that would establish SAO as a pioneer and leader in space science research.
|Mount Wilson, California||Solar||34º13'N||118º56'W||1737||1908||1920|
|Hump Mountain, North Carolina||Solar||36º8'N||82º0'W||1500||1917||1918|
|Mount Montezuma, Chile||Solar||22º40'S||68º56'W||2711||1920||?|
|Mount Harquahala, Arizona||Solar||33º48'N||113º20'W||1721||1920||1925|
|Table Mountain, California||Solar||34º22'N||117º41'W||2286||1925||1962|
|Mount Brukkaros, Namibia||Solar||25º52'S||17º48'E||1586||1926||1931|
|Mount Saint Catherine, Egypt||Solar||28º31'N||33º56'E||2591||1934||1937|
|Burro Mountain, New Mexico||Solar||32º40'N||108º33'W||2440||1938||1946|
|Organ Pass, New Mexico||Space Track||32º25'N||253º27'E|
|Olifantsfontein, South Africa||Space Track||25º58'S||28º15'E|
|Woomera, Australia||Space Track||31º06'S||136º46'E|
|Cadiz, Spain||Space Track||36º28'N||353º48'E|
|Shiraz, Iran||Space Track||29º38'N||52º31'E|
|Curaçao, Netherlands West Indies||Space Track||12º05'N||291º10'E|
|Jupiter, Florida||Space Track||27º01'N||279º53'E|
|Haleakala, Hawaii||Space Track||20º43'N||203º45'E|
|Villa Dolores, Argentina||Space Track||31º57'S||294º54'E|
|Mitaka, Japan||Space Track|
|Nani Tal, India||Space Track|
|Oak Ridge Observatory|
The SAO today
SAO's pioneering efforts in the development of orbiting observatories and large ground-based telescopes, the application of computers to astrophysical problems, and the integration of laboratory measurements, theoretical astrophysics, and observations across the electromagnetic spectrum have contributed much to our current understanding of the universe.
- Samuel Pierpont Langley 1890–1906
- Charles Greeley Abbot 1906–1942
- Loyal Blaine Aldrich 1942–1955
- Fred Lawrence Whipple 1955–1973
- George B. Field 1973–1982 (with the creation of the Harvard-Smithsonian Center for Astrophysics in 1973, the director of SAO and the Harvard College Observatory became a joint position)
- Irwin I. Shapiro 1982–2004
- Charles R. Alcock 2004–
- "SAO History". Retrieved 2015-09-03.
- "About CfA". HARVARD & SMITHSONIAN CENTER FOR ASTROPHYSICS. Retrieved 2019-05-29.
- Wright, F. W.; Hodge, P. W. (1965). "The Volcanic Dust Sampling Program of the Smithsonian Astrophysical Observing Stations". SAO Special Report #172 (1965). 172: 172. Bibcode:1965SAOSR.172.....W.
- Roosen, Robert G.; Angione, Ronald J. (1977). "Variations in Atmospheric Water Vapor: Baseline Results from Smithsonian Observations". Publications of the Astronomical Society of the Pacific. 89: 814. Bibcode:1977PASP...89..814R. doi:10.1086/130233.
- "SAO Directors: 1834 - Present". Smithsonian Astrophysical Observatory. Retrieved 2015-09-03.
- "Charles Alcock Named Director of the Harvard-Smithsonian Center for Astrophysics". Harvard-Smithsonian Center for Astrophysics. Retrieved 2015-09-17.