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More than 300 clear days and nights a year, almost no light pollution and a large scientific and recreational infrastructure make northern Chile the world's astronomical capital. The region has the largest astrotourism offer, with the most observatories in the country and the so-called "star route."
The Atacama Desert is one of the driest deserts in the world and has one of the clearest and starriest skies, making it an ideal place for stargazing. For its part, the Elqui Valley in the Coquimbo region was declared the world's first International Dark Sky Sanctuary in 2015, further underscoring the region's importance for astrotourism.
In addition, in order to protect this natural heritage, since 1999 the country has an environmental regulation whose objective is to prevent light pollution of the skies in the Northern Regions.
According to statistics, 21.3% of international tourists say that their travel to Chile was mainly motivated by the option of astrotourism. To meet this need, in Santiago, La Serena, the main towns of the Elqui Valley, San Pedro de Atacama, Antofagasta and Iquique you can find several agencies that offer guided tours with great equipment.
Some of the Main Astronomical Observatories in Chile
It is important to note that in Chile there are both scientific and tourist observatories. Unlike tourist observatories, which can be visited at night and make observations, the observatories of scientific nature can be visited only during the day, touring the facilities, telescopes and control rooms, but you will not be able to make observations, as it is the place where the astronomers work.
ALMA Observatory
ALMA is open for those who wish to know its facilities located in the North of Chile (50 km from San Pedro de Atacama) every Saturday and Sunday morning prior registration. Only previously registered persons may visit the ALMA Operations Support Site (OSF), a camp where ALMA staff works and where visitors can see the control room, laboratories and antennas in maintenance and an antenna carrier, in case they are available. For security reasons, visits to the Chajnantor plain (AOS, where the antenna set is located) are not authorized, due to its altitude, 5,000 meters above sea level.
Cerro Tololo Inter-American Observatory
It is located at Elqui Valley, approximately 80 km from La Serena, in the Coquimbo Region, also known as Chile's Fourth Region, at an altitude of 2200 meters above sea level. It is operated by the Association of Universities for Research in Astronomy, AURA, a consortium of American private universities in collaboration with the National Optical Astronomy Observatories, NOAO, under an agreement with the National Science Foundation and the Universidad de Chile. Cerro Tololo is one of the oldest and probably the best known observatory in the country, the project to build it began in 1962 and was completed in November 1967, when it became operational. However, it has a cutting-edge technology that includes a radio telescope and seven optical telescopes. Cerro Tololo is considered the fourth observatory in the world for its ability to observe the celestial vault, especially new constellations and passage of artificial satellites.
It is possible to make free guided visits to the facilities every Saturday of the month, although reservations must be made several weeks in advance. The tour has a total duration of approximately two hours.
Vera C. Rubin Observatory
The Vera C. Rubin Astronomical Observatory is under construction on Cerro Pachón in the Coquimbo region of Chile and is scheduled to become operational in 2025. It is named after Vera C. Rubin, in honor of a prominent American astronomer known for her contributions to the study of dark matter in the universe.
This observatory has an 8-meter telescope and a 3.2-gigapixel camera, the largest digital camera ever made for optical astronomy. The gigantic camera to be installed at the Vera C. Rubin Observatory, formerly known as LSST (Large Synoptic Survey Telescope) will revolutionize the way the universe has been studied until now. The 3.2-gigapixel camera is the largest ever built for optical astronomy and will enable scientists to conduct a decadal survey of the sky, called the Legacy Survey of Space and Time, which will provide information on millions of galaxies, stars and space objects. This telescope is a flagship project of modern astronomy, designed to survey the night sky over long ranges and create a three-dimensional map of astronomical objects.
Paranal Observatory
Paranal consists of the Very Large Telescope (VLT), which has four 8.2 m telescopes. These four main telescopes can combine their light to use a fifth instrument, the Very Large Telescope Interferometer (VLTI). It also has four 1.8 m Auxiliary Telescopes (AT) which can join the VLTI in case the main telescopes are being used in other projects, a 2.5 m VLT Survey Telescope (VST) and the Visible & Infrared Survey Telescope for Astronomy (VISTA) of 4 m.
The Paranal Observatory in Chile uses a Four Laser Guide Star Facility (4LGSF) to send four laser beams into the sky to create artificial stars by exciting sodium atoms in the mesosphere. These artificial stars are used to correct for the turbulence of the Earth's atmosphere, allowing for higher quality astronomical observations. Each laser in the 4LGSF delivers 22 watts of power, making it the most powerful laser guide star system in the world. The 4LGSF is part of the Adaptive Optics Facility on Unit Telescope 4 of the Very Large Telescope (VLT) at Cerro Paranal, and it complements the Laser Guide Star Facility (LGSF). The purpose of these lasers is to improve the image quality of the telescopes by compensating for the distortion caused by the Earth's atmosphere, ultimately achieving a similar image quality to that of a space telescope.
Visits are free, Saturdays from 10:00 a.m. to 2:00 p.m. but places are limited. Click here for Weekend Visits to Paranal Observatory.
La Silla Observatory
La Silla is located about 160 km. NE of La Serena, near the Atacama Desert on a mountain of 2400 meters. It has eighteen telescopes, of which five were built by the European Southern Observatory (ESO), while others are partly maintained by ESO. The observatory is one of the largest in the southern hemisphere.
Its facilities house one of the world's most modern spectrographs, the High Accuracy Radial velocity Planet Searcher (HARPS), which aims to observe exoplanets. Another outstanding instrument that works here is the Gamma-Ray Burst Optical / Near-Infrared Detector (GROND).
Click here for Weekend Visits to La Silla Observatory.
Its facilities house one of the world's most modern spectrographs, the High Accuracy Radial velocity Planet Searcher (HARPS), which aims to observe exoplanets. Another outstanding instrument that works here is the Gamma-Ray Burst Optical / Near-Infrared Detector (GROND).
Click here for Weekend Visits to La Silla Observatory.
Gemini South Observatory
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These twin telescopes, together, manage to cover the entire sky of both hemispheres throughout the year, obtaining high quality images due to the excellent atmospheric conditions presented by the sites where they are located.
Gemini is made up of an international cooperation that includes the USA, Canada, Great Britain, Brazil, France, Argentina, Australia, and Chile as host country. It is administered by the Association of Universities for Research in Astronomy (AURA) under a cooperation agreement with the National Science Foundation of the United States (NSF).
Click here for Public Visits to South Gemini Observatory.
Las Campanas Observatory
Las Campanas, belonging to the Carnegie Organization of the United States, is located in the Atacama Region, on the border with the Coquimbo Region, near the commune of Vallenar. It is at a height of 2380 meters above sea level, 27 km. North of La Silla Observatory. Currently it has 4 large telescopes, in addition to several other instruments, some in operation and others under construction. The Giant Magellan Telescope, which will consist of seven primary segments of 8.4 meters in diameter, is expected to be completed by 2025.
It is recommended to book one month in advance, it is open to tourists every Saturday of the year. The tour lasts about 3 hours and there are no specialized guides to receive visitors, but are attended by the technicians who work at the scientific observatory.
The administrative office is located in the city of La Serena. Visits are scheduled by calling 56 51 2207301
APEX Observatory
Atacama Pathfinder Experiment is located at the Chajnantor Plain, 5,100 meters high in the Atacama Desert, in an extremely dry place, inhospitable for humans but excellent for submillimeter astronomy. The telescope, operated by an international alliance between partners from different European countries was built by VERTEX Antennentechnik in Duisburg, Germany and it is a partnership between 3 European research institutes, the Max Planck Institute for Radio Astronomy (MPIfR), the Onsala Space Observatory (OSO) and the European Southern Observatory (ESO).APEX, the largest submillimeter wave telescope operating in the Southern Hemisphere, is based on an antenna prototype developed for the ALMA project. It investigates targets that are then studied in much greater detail by the ALMA Observatory, making these two facilities complementary in their exploration of outer space.
Giant Magellan Telescope
The Giant Magellan Telescope (GMT) is one of the largest telescopes in the world currently under construction at the Las Campanas Observatory in Chile’s Atacama Desert. When completed by the late 2020s, the GMT will feature a primary mirror with a diameter of 25.4 meters, made up of seven segmented mirrors, each 8.4 meters in diameter.
The telescope will be situated at an altitude of 2,514 meters south of the city of Vallenar, atop Cerro Las Campanas, away from light pollution and with over 300 clear nights per year. From this prime location, the GMT will be able to observe the center of the Milky Way and objects millions of light-years away with great detail.
Once operational, the GMT will be capable of producing images 10 times sharper than those of the Hubble Space Telescope. This will enable it to discover Earth-like planets around nearby stars, study dark matter and dark energy, and observe the first galaxies formed after the Big Bang 13.8 billion years ago.
The GMT is an international project led by the GMTO Corporation, a consortium of universities and scientific institutions from the United States, Australia, Brazil, South Korea, and Chile.
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Cerro Mamalluca Tourist Observatory
Click here for Tours to Mamalluca Observatory.
Paniri Caur Tourist Observatory
Paniri Caur, just like Mamalluca, is another of the tourist monitoring centers in Northern Chile. It is located in the little town of Chiu Chiu, half an hour from the city of Calama, Antofagasta Region. The visit to this astronomical observatory, in charge of the Sol del Desierto company, is another unforgettable experience.Paniri Caur is the only Andean Archaeoastronomy observatory, which seeks to combine the idea of the Cosmos that the ancient Atacameño people had with the modern vision of the Universe. The tours to Paniri Caur not only include the visit to the observatory itself, but also guided tours by routes, excursions to villages and places with rock art.
Visits are scheduled by calling +56 99546 2023
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