Félix Aguilar Observatory is an astronomical observatory in the San Juan Province of Argentina. Its primary observing facility is located El Leoncito National Park in the west of San Juan Province. Also located in El Leoncito Park is the Leoncito Astronomical Complex. The remote site was known as "El Leoncito Observatory" until 1990, when it became Carlos Ulrrico Cesco Astronomical Station. The observatory is operated by the School of Physical and Natural Sciences at National University of San Juan in San Juan, Argentina.
The original OAFA observatory buildings are located at the west end of the city.OAFA is named after Félix Aguilar (1884–1943), an Argentine astronomer and engineer who was director of the La Plata Astronomical Observatory from 1919 to 1921, and again from 1934 until his death. EACUC was renamed after Carlos Ulrrico Cesco on the 25th anniversary of the beginning of observations in honour of his contributions to the founding and operation of the observatory.
The principal telescope of EACUC is a double astrograph consisting of two lenses each 20-inches (50.8 cm) in diameter, one designed for blue light and the other for yellow light. The lenses focus the light separately onto two photographic plates with dimensions of 17×17 inches (43×43 cm). The photographic plates are purchased in the U.S., shipped to Argentina, exposed in the telescope, developed, and then shipped back to the U.S. In New Haven, Connecticut, the plates are measured with a precision measuring machine.
unnamed telescope 0.8 m reflector
unnamed double astrograph 0.5 m solar telescope (×2)
Mirror Coronagraph for Argentina solar telescope
H-Alpha Solar Telescope of Argentina solar telescope
ROA Automated Meridian Telescope astrograph