Marseille Observatory

Marseille Observatory

Alternative names	Observatoire de Marseille
Organization	Observatoire des Science de l'Univers Institut Pythéas
Observatory code	014
Location	Marseille, France
Coordinates	43°18′20″N 5°23′41″E / 43.30547°N 5.39477°E / 43.30547; 5.39477
Altitude	40 m (130 ft)
Established	1702
Website	www.lam.fr
Telescopes
80-cm Foucault (1862) Glass-mirror Marseille 0.36-metre (1989) Spectrographic
Location of Marseille Observatory Show map of France Marseille Observatory (Provence-Alpes-Côte d'Azur) Show map of Provence-Alpes-Côte d'Azur
[edit on Wikidata]

Marseille Observatory (French: Observatoire de Marseille) is an astronomical observatory located in Marseille, France, with a history that goes back to the early 18th century. In its 1877 incarnation, it was the discovery site of a group of galaxies known as Stephan's Quintet, discovered by its director Édouard Stephan. Marseille Observatory is now run as a joint research unit by Aix-Marseille University and the French National Center for Scientific Research (CNRS).

The old Palais Longchamp facilities are a noted tourist attraction in Marseille, and a planetarium was also added in 2001.^[1][2] One of the noted exhibits is the Foucault glass-mirror telescope, and various items from centuries of astronomical activities.

Foucault's telescope is a noted historical example because it was the forerunner of the modern style of big reflecting telescopes which use a minute layer of metal on a figured piece of glass. Before this, the main technology was to make the whole mirror of metal, and it would really be another half-century before silvered glass mirrors really caught on for astronomy. A major change in the 20th century was to shift from using solution to coat the glass with silver to using a vapor deposition process.