Alternative names | SAAO | ||||||||||||||||||||
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Organization | National Research Foundation of South Africa | ||||||||||||||||||||
Observatory code | 51, B31, A60, L66 | ||||||||||||||||||||
Location | Headquarters in Observatory, Cape Town Major telescopes in Sutherland, Northern Cape | ||||||||||||||||||||
Coordinates | Headquarters: 33°56′05″S18°28′39″E / 33.9347°S 18.4776°E Sutherland: 32°22′42″S20°48′38″E / 32.3783°S 20.8105°E | ||||||||||||||||||||
Established |
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Website | saao | ||||||||||||||||||||
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The South African Astronomical Observatory (SAAO) is the national centre for optical and infrared astronomy in South Africa. It was established in 1972. The observatory is run by the National Research Foundation of South Africa. The facility's function is to conduct research in astronomy and astrophysics. The primary telescopes are located in Sutherland, which is 370 kilometres (230 mi) from Observatory, Cape Town, where the headquarters is located. [2]
The SAAO has links worldwide for scientific and technological collaboration. Instrumental contributions from the South African Astronomical Observatory include the development of a spherical aberration corrector and the Southern African Large Telescope (SALT).
The Noon Gun on Cape Town's Signal Hill is fired remotely by a time signal from the Observatory.
The history of the SAAO began when the Royal Observatory at the Cape of Good Hope was founded in 1820, the first scientific institution in Africa. [3] Construction of the main buildings was completed in 1829 at a cost of £30,000 [4] (equivalent to £3.3 million in 2024 [5] ). The post of His/Her Majesty's astronomer at the Cape of Good Hope was awarded the Royal Medal on two occasions; the first to Thomas Maclear in 1869 for measurement of an arc of the meridian at the Cape of Good Hope [6] and the second to David Gill in 1903 for researches in solar and stellar parallax, and his energetic direction of the Royal Observatory at the Cape of Good Hope. [7]
The Republic Observatory, Johannesburg, was merged with the much older Royal Observatory, Cape of Good Hope in January 1972 to form the South African Astronomical Observatory. In 1974 the Radcliffe Observatory telescope was purchased by the CSIR and moved to Sutherland, where it recommenced work in 1976.
SAAO was established in January 1972, as a result of a joint agreement by the Council for Scientific and Industrial Research (CSIR) of South Africa and Science and Engineering Research Council (SERC) of United Kingdom. The headquarters are located on the grounds of the old Royal Observatory where the main building, offices, national library for astronomy and computer facilities are housed. Historic telescopes are also found at the headquarters in a number of domes and a small museum that displays scientific instruments. The South African Astronomical Observatory is administered at present as a National Facility under management of the National Research Foundation (NRF), formerly the Foundation for Research Development (FRD). In 1974, when the Radcliffe Observatory in Pretoria closed, the Council for Scientific and Industrial Research (CSIR) purchased the 1.9-m Radcliffe Telescope and transported it to Sutherland. [8]
The observatory operates from the campus of the Royal Observatory, Cape of Good Hope that was established in 1820 [9] in the suburb of Observatory, Cape Town.
The major observing facilities are, however, located near the town of Sutherland some 370 kilometres (230 mi) [2] from Cape Town. Sutherland was chosen because of its reliably clear and dark nights, but to ensure long term viability of the Karoo site astronomy instruments, the South African Parliament passed the Astronomy Geographic Advantage Act in 2007. The act gives the Minister of Science and Technology the authority to protect areas, through regulations, that are of strategic national importance for astronomy and related scientific endeavours.
This 0.5 metres (20 in) reflector was originally built for the Republic Observatory in 1967, but was moved to the Sutherland site in 1972. No longer in use.
The 20" telescope was replaced with the Meerlicht telescope. The 20" telescope was relocated to the University of Freestate Boyden observatory and commissioned in ~2019 [10]
A 0.75 metres (30 in) Grubb Parsons reflector.
This 40 inches (1.0 m) telescope was originally located at SAAO Head office in Observatory, Cape Town, but has since moved to the Sutherland site. [11] This telescope participates in the PLANET network. [12]
The 1.9-m (74-inch) Radcliffe Telescope was commissioned for the Radcliffe Observatory in Pretoria where it was in use between 1948 and 1974. Following the closure of the Radcliffe Observatory it was moved to Sutherland where it became operational again in January 1976. Between 1951 and 2004 it was the largest telescope in South Africa. [13] The telescope was manufactured by Sir Howard Grubb, Parsons and Co. [14]
This 29.5 inches (75 cm) telescope was originally called the Automatic Photometric Telescope, but has been renamed the Alan Cousins Telescope in honour of Alan William James Cousins. [15] [16]
One of six telescopes in the Birmingham Solar Oscillations Network.
The IRSF is a 140 centimetres (55 in) reflector fitted with a 3 colour Infrared Imager. [17] Originally built as part of the Magellanic Clouds – A Thorough Study grant from the Japanese Ministry of Education, Culture, Sports, Science and Technology in 2000. [18] Other studies the telescope participated in include:
Three 1 metre (39 in) telescopes to form part of the LCOGT network were installed in early 2013. [20]
The MASTER-SAAO Telescope (obs. code: K95) is part of the Russian Mobile Astronomical System of Telescope-Robots. It saw first light on 21 December 2014. [21] It consists of two paired 0.4-m telescopes. [22] In April 2015 it discovered the first comet from South Africa in 35 years, C/2015 G2 (MASTER). [23]
One of the two 1.20 metres (47 in) telescopes of the MOnitoring NEtwork of Telescopes Project is located at Sutherland. Its twin can be found at the McDonald Observatory in Texas. [24] The MONET telescopes are Robotic telescope controllable via the Internet and was constructed by the University of Göttingen. [25] Remote Telescope Markup Language is used to control the telescopes remotely. [26]
PRime-focus Infrared Microlensing Experiments is a 1.8 metres (71 in) telescope located in Sutherland. [27] PRIME achieved first light on October 8, 2022. Currently PRIME has a near-infrared camera located in its prime focus with a 1.29 square degree field of view. The telescope is a collaboration between Osaka University, University of Maryland, [28] South African Astronomical Observatory, NASA Goddard Space Flight Center [29] and Astro-Biology Center. The project's primary science objective is the study of exoplanets using gravitational microlensing. [30]
Two telescopes forming part of Project Solaris is located at the Sutherland site. Solaris-1 and Solaris-2 are both 0.5m f/15 Ritchey–Chrétien telescope. The aims of Project Solaris is to detect circumbinary planets around eclipsing binary stars and to characterise these binaries to improve stellar models. [31]
SALT was inaugurated in November 2005. It is the largest single optical telescope in the Southern Hemisphere, with a hexagonal mirror array 11 meters across. SALT shares similarities with the Hobby-Eberly Telescope (HET) in Texas. The Southern African Large Telescope gathers twenty-five times as much light as any other existing African Telescope. [32] With this larger mirror array, SALT can record distant stars, galaxies and quasars.
The Wide Angle Search for Planets consists of two robotic telescopes, the one located at SAAO Sutherland and the other at Roque de los Muchachos Observatory on the island of La Palma in the Canaries. [33] WASP-17b, the first exoplanet known to have a retrograde orbit was discovered in 2009 using this array.
KELT-South (Kilodegree Extremely Little Telescope – South) is a small robotic telescope that is designed to detect transiting extrasolar planets. The telescope is owned and operated by Vanderbilt University and was based on the design of KELT-North, which was conceived and designed at the Ohio State University, Department of Astronomy. The KELT-South telescope will serve as a counterpart to its northern twin, surveying the southern sky for transiting planets over the next few years.
Optical wide-field telescope, installed in 2017. It has a 60 cm (24 in) effective aperture, and a 1.65 x 1.65 degree field-of-view, sampled at 0.56"/pix. It was designed and manufactured in the Netherlands (Radboud University & NOVA) and is run by a consortium of Radboud University, University of Cape Town, the NRF/SAAO, the University of Oxford, the University of Manchester and the University of Amsterdam. It is the optical eye of MeerKAT, and has as its main-purpose to twin with the MeerKAT radio array to achieve a simultaneous optical-radio coverage of the Southern Skies. It is the prototype of the BlackGEM array, installed at ESO La Silla in Chile.
The Yonsei Survey Telescopes for Astronomical Research (YSTAR), decommissioned in 2012, was used for the monitoring of variable stars and other transient events. YSTAR was a joint project between SAAO and the Yonsei University, Korea. [25]
The ATLAS asteroid impact early warning system, developed by the University of Hawaii and funded by NASA, consists of 4 telescopes; South Africa hosts ATLAS-Sutherland. In February 2023, the telescope observed the comet C/2023 A3 (Tsuchinshan–ATLAS). [34] [35]
The GeoForschungsZentrum, Potsdam in co-operation with the National Research Foundation of South Africa constructed the SAGOS between 1998 and 2000.
SAGOS consist of a 1 Hz permanent GPS station, a superconducting gravimeter, meteorological sensors, and a tri-axial magnetometer. The GPS station is also used in support of the CHAllenging Minisatellite Payload (CHAMP) and Gravity Recovery and Climate Experiment (GRACE) space missions. [36]
The SUR station forms part of the International Deployment of Accelerometers Project and the Global Seismographic Network of the Incorporated Research Institutions for Seismology [37] [38]
The Southern African Large Telescope (SALT) is a 9.2-metre optical telescope designed mainly for spectroscopy. It consists of 91 hexagonal mirror segments each with a 1-metre inscribed diameter, resulting in a total hexagonal mirror of 11.1 by 9.8 m. However, its effective aperture is only 9.2 m. It is located close to the town of Sutherland in the semi-desert region of the Karoo, South Africa. It is a facility of the South African Astronomical Observatory, the national optical observatory of South Africa.
The Apache Point Observatory is an astronomical observatory located in the Sacramento Mountains in Sunspot, New Mexico, United States, approximately 18 miles (29 km) south of Cloudcroft. The observatory is operated by New Mexico State University (NMSU) and owned by the Astrophysical Research Consortium (ARC). Access to the telescopes and buildings is private and restricted.
The Cerro Tololo Inter-American Observatory (CTIO) is an astronomical observatory located on the summit of Mt. Cerro Tololo in the Coquimbo Region of northern Chile, with additional facilities located on Mt. Cerro Pachón about 10 kilometres (6.2 mi) to the southeast. It is approximately 80 kilometres (50 mi) east of La Serena, where support facilities are located. The principal telescopes at CTIO are the 4 m Víctor M. Blanco Telescope, named after Puerto Rican astronomer Víctor Manuel Blanco, and the 4.1 m Southern Astrophysical Research Telescope, which is situated on Cerro Pachón. Other telescopes on Cerro Tololo include the 1.5 m, 1.3 m, 1.0 m, and 0.9 m telescopes operated by the SMARTS consortium. CTIO also hosts other research projects, such as PROMPT, WHAM, and LCOGTN, providing a platform for access to the southern hemisphere for U.S. and worldwide scientific research.
University of Canterbury Mount John Observatory (UCMJO), previously known as Mt John University Observatory (MJUO), is New Zealand's premier astronomical research observatory. It is situated at 1,029 metres (3,376 ft) ASL atop Mount John at the northern end of the Mackenzie Basin in the South Island, and was established in 1965. There are many telescopes on site including: one 0.4 metre, two 0.6 metre, one 1.0 metre, and a 1.8 metre MOA telescope. The nearest population centre is the resort town of Lake Tekapo (pop. >500). Approximately 20% of nights at UCMJO are photometric, with a larger number available for spectroscopic work and direct imaging photometry.
William Stephen FinsenFRAS was a South African astronomer. He discovered a number of double stars and took many photographs of Mars. He developed the Finsen eyepiece interferometer to measure very close double stars. He was the final director of Union Observatory in South Africa from 1957 to 1965.
Siding Spring Observatory near Coonabarabran, New South Wales, Australia, part of the Research School of Astronomy & Astrophysics (RSAA) at the Australian National University (ANU), incorporates the Anglo-Australian Telescope along with a collection of other telescopes owned by the Australian National University, the University of New South Wales, and other institutions. The observatory is situated 1,165 metres (3,822 ft) above sea level in the Warrumbungle National Park on Mount Woorat, also known as Siding Spring Mountain. Siding Spring Observatory is owned by the Australian National University (ANU) and is part of the Mount Stromlo and Siding Spring Observatories research school.
WASP or Wide Angle Search for Planets is an international consortium of several academic organisations performing an ultra-wide angle search for exoplanets using transit photometry. The array of robotic telescopes aims to survey the entire sky, simultaneously monitoring many thousands of stars at an apparent visual magnitude from about 7 to 13.
Sutherland is a town with about 2,841 inhabitants in the Northern Cape province of South Africa. It lies in the western Roggeveld Mountains in the Karoo.
The Probing Lensing Anomalies NETwork (PLANET) collaboration coordinates a network of telescopes to rapidly sample photometric measurements of the magnification of stars in the galactic bulge undergoing gravitational microlensing by intervening foreground stars. This network consists of five 1m-class optical telescopes distributed in longitude around the southern hemisphere in order to perform quasi-continuous round-the-clock precision monitoring. On a target-of-opportunity basis, less frequent spectroscopic measurements complement the rapid photometry for selected prime targets. Since 2005, PLANET performs a common microlensing campaign with RoboNet-1.0, a network of UK-operated 2.0m robotic telescopes.
Las Cumbres Observatory (LCO) is a network of astronomical observatories run by a non-profit private operating foundation directed by the technologist Wayne Rosing. Its offices are in Goleta, California. The telescopes are located at both northern and southern hemisphere sites distributed in longitude around the Earth. For some astronomical objects, the longitudinal spacing of telescopes allows continuous observations over 24 hours or longer. The operating network currently consists of two 2 meter telescopes, nine 1 meter telescopes, and seven 40 cm telescopes, placed at six astronomical observatories. The network operates as a single, integrated, observing facility, using a software scheduler that continuously optimizes the planned observing schedule of each individual telescope.
Grubb Parsons was a historic manufacturer of telescopes, active in the 19th and 20th centuries. They built numerous large research telescopes, including several that were the largest in the world of their type.
MOA-2009-BLG-387L is a red dwarf in the Sagittarius constellation that is host to the planet MOA-2009-BLG-387Lb. The star is estimated to be nearly 20,000 light years away and approximately one fifth the mass of the Sun, although large confidence intervals exist, reflecting the uncertainties in both the mass and distance. The star drew the attention of astronomers when it became the lens of gravitational microlensing event MOA-2009-BLG-387L, in which it eclipsed a background star and created distorted caustics, an envelope of reflected or refracted light rays. Analysis of the caustic events and of follow-up observational data led to the planet's discovery, which was reported in February 2011.
The Kilodegree Extremely Little Telescope is an astronomical observation system formed by two robotic telescopes that are conducting a survey for transiting exoplanets around bright stars. The project is jointly administered by members of Ohio State University Department of Astronomy, the Vanderbilt University Department of Physics and Astronomy Astronomy Group, the Lehigh University Department of Physics, and the South African Astronomical Observatory (SAAO).
Ian Stewart Glass is an infrared astronomer and scientific historian living in Cape Town, South Africa.
Time-domain astronomy is the study of how astronomical objects change with time. Though the study may be said to begin with Galileo's Letters on Sunspots, the term now refers especially to variable objects beyond the Solar System. Changes over time may be due to movements or changes in the object itself. Common targets included are supernovae, pulsating stars, novas, flare stars, blazars and active galactic nuclei. Visible light time domain studies include OGLE, HAT-South, PanSTARRS, SkyMapper, ASAS, WASP, CRTS, GOTO and in a near future the LSST at the Vera C. Rubin Observatory.
The Royal Observatory, Cape of Good Hope, is a former scientific institution in South Africa. Founded by the British Board of Longitude in 1820, its main building is now the headquarters building of the South African Astronomical Observatory.
The SAAO Library is the national library of the South African Astronomical Observatory (SAAO) for astronomy and space science located in Observatory, Cape Town, South Africa. Its primary function is to conduct fundamental research in astronomy and astrophysics. The SAAO library can be seen as the integral part of the facility as it provides the research staff with access to essential information and tools that allow them to function as informed professionals within their community.
The Next-Generation Transit Survey (NGTS) is a ground-based robotic search for exoplanets. The facility is located at Paranal Observatory in the Atacama Desert in northern Chile, about 2 km from ESO's Very Large Telescope and 0.5 km from the VISTA Survey Telescope. Science operations began in early 2015. The astronomical survey is managed by a consortium of seven European universities and other academic institutions from Chile, Germany, Switzerland, and the United Kingdom. Prototypes of the array were tested in 2009 and 2010 on La Palma, and from 2012 to 2014 at Geneva Observatory.
The Radcliffe Telescope is a 74 in (1.9 m) optical/near-infrared reflecting telescope located at the South African Astronomical Observatory in Sutherland, Northern Cape, South Africa.
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Photos of the dome of the Victoria telescope from the University of Cambridge |