The Pic du Midi de Bigorre or simply the Pic du Midi is a mountain in the French Pyrenees. It is the site of the Pic du Midi Observatory.
Pic du Midi Observatory
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The Pic du Midi Observatory is an astronomical observatory located at 2877 meters on top of the Pic du Midi de Bigorre in the FrenchPyrenees. It is part of the Midi-Pyrenees Observatory which has additional research stations in the southwestern French towns of Tarbes, Lannemezan, and Auch, as well as many partnerships in South America, Africa, and Asia, due to the guardianship it receives from the French Research Institute for Development. Construction of the observatory began in 1878 under the auspices of the Société Ramond, but by 1882 the society decided that the spiralling costs were beyond its relatively modest means, and yielded the observatory to the French state, which took it into its possession by a law of 7 August 1882. The 8 metre dome was completed in 1908, under the ambitious direction of Benjamin Baillaud. It housed a powerful mechanical equatorial reflector which was used in 1909 to formally discredit the Martian canal theory. In 1946 Mr. Gentilli funded a dome and a 0.60-meter telescope, and in 1958, a spectrograph was installed. A 1.06-meter telescope was installed in 1963, funded by NASA and was used to take detailed photographs of the surface of the Moon in preparation for the Apollo missions. In 1965 the astronomers Pierre and Janine Connes were able to formulate a detailed analysis of the composition of the atmospheres on Mars and Venus, based on the infrared spectra gathered from these planets. The results showed atmospheres in chemical equilibrium. This served as a basis for James Lovelock, a scientist working for the Jet Propulsion Laboratory in California, to predict that those planets had no life - a fact that would be proven and scientifically accepted years after. A 2-meter telescope, known as the Bernard Lyot Telescope was placed at the observatory in 1980 on top of a 28-meter column built off to the side to avoid wind turbulence affecting the seeing of the other telescopes. It is the largest telescope in France. The observatory also has a coronagraph, which is used to study the solar corona. A 0.60-meter telescope is also located at the top of Pic du Midi. Since 1982 this T60 is dedicated to amateur astronomy and managed by a group of amateurs, called association T60. The observatory consists of:
The 0.55-meter telescope ;
The 0.60-meter telescope ;
The 1.06-meter telescope dedicated to observations of the solar system;
The Charvin dome, which sheltered a photoelectric coronometer ;
The Baillaud dome, reassigned to the museum in 2000 and which houses a 1:1 scale model coronagraph.
The observatory is located very close to the Greenwich meridian. Saturn's moon Helene, was discovered by French astronomers Pierre Laques and Jean Lecacheux in 1980 from ground-based observations at Pic du Midi, and named Helene in 1988. It is also a trojan moon of Dione. The main-belt asteroid 20488 Pic-du-Midi, discovered at Pises Observatory in 1999, was named for the observatory and the mountain it is located on.
Officially initiated in 2009, during the international year of astronomy, the Pic du Midi International Dark Sky Reserve was labeled in 2013 by the International Dark-Sky Association. It's the sixth in the world, the first in Europe and the only one still today in France. The IDSR aims to limit the exponential propagation of light pollution, in order to preserve the quality of the night. Co-managed by the Syndicat mixte for the tourist promotion of the Pic du Midi, the Pyrénées National Park and the Departmental Energy Union 65, its priority actions are the public education on the impacts and consequences of these pollutions as well as the establishment of responsible lighting in the Haut-Pyrenean territory. It covers 3,000 km2, or 65% of the Hautes-Pyrénées. The IDSR includes 251 communes spread around the Pic du Midi de Bigorre and is distinguished in two zones:
A core zone, devoid of any permanent lighting and witnessing an exceptional night quality;
A buffer zone, in which the territory actors recognize the importance of the nocturnal environment and undertake to protect it.
The IDSR initiated the program "Ciel Etoilé", program of reconversion of the 40 000 luminous points of its territory, the program "Gardiens des Etoiles", program of metrological monitoring of the light pollution evolution, but also the program "Adap'Ter", project that will identify "trames sombres".
Climate
Pic du Midi de Bigorre has an mediterraneanalpine climate with a polar temperature regime courtesy of its high elevation. Due to the Gulf Stream moderation of the surrounding lowlands, temperature swings are in general quite low. This results in temperatures rarely exceeding even during lowland heat waves, and also temperatures beneath being extremely rare. The UV index is higher than in the surrounding lowlands due to the elevation. Snow cover is permanent during winter months, but melts for a few months each year. Seasonal lag is extreme during winter and spring, with February being the clearly coldest month, and May having mean temperatures below freezing. Among lowland climates, the station closely resembles Nuuk in Greenland for the temperature regime.
