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The Brazilian Decimetric Array (BDA) is a 26-element
radio telescope A radio telescope is a specialized antenna and radio receiver used to detect radio waves from astronomical radio sources in the sky. Radio telescopes are the main observing instrument used in radio astronomy, which studies the radio frequency ...
interferometer Interferometry is a technique which uses the ''interference'' of superimposed waves to extract information. Interferometry typically uses electromagnetic waves and is an important investigative technique in the fields of astronomy, fiber op ...
located in the municipality of
Cachoeira Paulista Cachoeira Paulista is a municipality in the state of São Paulo (state), São Paulo in Brazil. It is part of the Metropolitan Region of Vale do Paraíba e Litoral Norte, in the Guaratinguetá Microregion. It is located at latitude 22º39'54 "south ...
in the
state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * ''The State'' (newspaper), a daily newspaper in Columbia, South Carolina, United States * ''Our S ...
of
São Paulo São Paulo (, ; Portuguese for 'Saint Paul') is the most populous city in Brazil, and is the capital of the state of São Paulo, the most populous and wealthiest Brazilian state, located in the country's Southeast Region. Listed by the GaWC a ...
,
Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...
. It is capable of performing both solar and stellar observations in three bands: 1.2 - 1.7, 2.8 and 5.6 GHz. The BDA will obtain radio images from the sun with a spatial resolution ~4x6 arc seconds. The main project was conceived and driven by Dr. H. S. Sawant. Financially sponsored by FAPESP an
INPE's Astrophysics Division
The T-shaped BDA is being constructed in three phases. The first phase was a linear array of five parabolic antennas on alt-azimuth
telescope mount A telescope mount is a mechanical structure which supports a telescope. Telescope mounts are designed to support the mass of the telescope and allow for accurate pointing of the instrument. Many sorts of mounts have been developed over the year ...
s laid out on an east-west baseline of . The dishes were originally installed at the
National Institute for Space Research The National Institute for Space Research ( pt, Instituto Nacional de Pesquisas Espaciais, INPE) is a research unit of the Brazilian Ministry of Science, Technology and Innovations, the main goals of which are fostering scientific research an ...
(INPE) campus in
São José dos Campos São José dos Campos (, meaning Saint Joseph of the Fields) is a major city and the seat of the Municipalities of Brazil, municipality of the same name in the state of São Paulo (state), São Paulo, Brazil. One of the leading industrial and res ...
in 2003 for testing. They were moved to Cachoeira Paulista in 2004. Beginning in 2010, the second phase was added. Nine antennas were placed on a new north-south baseline of , and twelve antennas were added to the original east-west baseline, extending it to a total of . A third phase yet to be built will increase the number of antennas to 38. The final baselines will be 2.27 km in the east-west and 1.17 km in the north-south directions respectively. The BDA is the result of efforts of Brazilian scientists in collaboration with outstanding international astronomers, namely: * Prof.
Govind Swarup Govind Swarup (March 23, 1929 – September 7, 2020) was a pioneer in radio astronomy. In addition to research contributions in multiple areas of astronomy and astrophysics, he was a driving force behind the building of "ingenious, innovative ...
, National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research, India, * Prof. Kiyoto Shibasaki, Nobeyama Radio Heliograph, Japan, * Dr. K. R. Subramanian, Indian Institute of Astrophysics, India, * Dr. N. Gopalwasmy, GSFC-NASA, USA, * Prof. W. J. Welch, University of Berkeley, USA, and * Prof. D. E. Gary, from the
New Jersey Institute of Technology {{Infobox university , name = {{nowrap, New Jersey Institute of Technology , image = New Jersey IT seal.svg , image_upright = 0.9 , former_names = Newark College of Engineering (1930–1975)Ne ...
, USA. The BDA, when completed, will be open to the entire scientific community for use for both solar and non-solar observations and studies of space weather phenomena.


See also

*
Itapetinga Radio Observatory Pierre Kauffman Radio Observatory (Portuguese: Rádio Observatório Pierre Kauffman - ROPK), also known as the Itapetinga Radio Observatory (Portuguese: Rádio Observatório de Itapetinga - ROI), is a radio observatory located in the municipality ...
*
List of astronomical observatories This is a list of astronomical observatories ordered by name, along with initial dates of operation (where an accurate date is available) and location. The list also includes a final year of operation for many observatories that are no longer in ...
*
List of radio telescopes This is a list of radio telescopes – over one hundred – that are or have been used for radio astronomy. The list includes both single dishes and interferometric arrays. The list is sorted by region, then by name; unnamed telescopes are in r ...


References

{{Portal bar, Brazil, Astronomy, Stars, Spaceflight, Outer space, Solar System, Education, Science Astronomical observatories in Brazil Buildings and structures in São Paulo (state) Radio telescopes