Tonantzintla Observatory
| Organization | INAOE, UNAM | ||||
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| Location | San Andrés Cholula, Puebla, Mexico | ||||
| Coordinates | 19°01′53″N 98°18′54″W / 19.0315°N 98.3151°WCoordinates: 19°01′53″N 98°18′54″W / 19.0315°N 98.3151°W | ||||
| Altitude | 2,166 metres (7,106 ft) | ||||
| Established | 1942 | ||||
| Website | OANTON OAN - Tonantzintla | ||||
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| unnamed telescope | 1.0 m reflector |
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| unnamed telescope | 0.7 m Schmidt |
Tonantzintla Observatory (Spanish: Observatorio de Tonantzintla) is an astronomical observatory located in the municipality of San Andrés Cholula in the Mexican state of Puebla. It consists of two adjacent facilities: the National Astrophysical Observatory of Tonantzintla (Spanish: Observatorio Astrofísico Nacional de Tonantzintla - OANTON), operated by the National Institute of Astrophysics, Optics and Electronics (INAOE), and the National Astronomical Observatory - Tonantzintla (Spanish: Observatorio Astronómico Nacional - Tonantzintla—OAN - Tonantzintla), operated by the National Autonomous University of Mexico (UNAM). OANTON is located on the INAOE campus, which includes numerous other buildings. OAN - Tonantzintla is located immediately to the east on mostly unused property. The observatory is located 11 kilometres (6.8 mi) west of Puebla and 33 kilometres (21 mi) east of Popocatépetl, eruptions of which sometimes interfere with observing.
OANTON was dedicated in February 1942 in a ceremony attended by the President of Mexico, Manuel Ávila Camacho, and other dignitaries. The project was begun some time earlier by Luis Enrique Erro, who was an astronomer by training but for many years had been the Mexican ambassador to the United States. In 1954 Guillermo Haro became the director of OANTON, and in 1971 the observatory became INAOE under his direction. In the same year INAOE began building a new observatory in Cananea, Sonora, which is now called Guillermo Haro Observatory.
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