Pons) Pons also discovered comets that came to be known by other names including Encke's Comet, Comet Crommelin, and Biela's Comet. This is not unusual as comet discoveries are sometimes later determined to be re-discoveries of previously observed comets or co-discoveries (discovered at the same time by others). Similarly, some comets were named for the first person to compute the comet's orbit, as in the case of Halley's comet. In 1863 Marseilles Observatory became a branch of the Paris Observatory. This led to a new building inaugurated by 1864, designed by the architect of Notre Dame de la Garde, also the 80 cm reflector was installed by that year (at the Palais Longchamp site). Work continued on improvements and by 1866 a Comet Seeker telescope of 18 cm aperture by Martin, and 25.8 cm (10.25") aperture refractor by Merz by 1872. The Merz refractor was on equatorial mounting with governor done by Foucault. Foucault operated his 80 cm silver-on-glass reflector at Marseille Observatory, a telescope with aperture 80 cm (31.5 inches) from about 1862 to its retirement in 1965. The telescope was noted for being a pioneering design, that used silver-coated glass in a reflecting telescope. There was also instruments and facilities for magnetic studies. 1872 Marseilles reported several new nebula discovered using the Eichens searcher. In 1873 Marseilles Observatory announced the discovery of 300 new nebula. Of these 75 had there positions accurately cataloged, which was done by comparing the location of the nebula with previously cataloged stars of known position. In 1873 Marseilles Observatory detached from Paris Observatory. In 1874 the Comet C/1874 H1 was discovered from the observatory. 20th century In 1914, the Orion nebula was observed with the Perot-Fabry interferometer. In 1965 the Foucault 80 cm reflecting telescope was retired. In 1989 the Marseille telescope was completed at the observatory, and then sent to the southern hemisphere later that year. The telescope is a reflecting telescope with 36 cm (~14.2") diameter mirror with a low-expansion glass-ceramic and of the Richey-Chrétien type. Starting in 1990 Marseille Observatory had a study of H alpha (H-alpha (Hα)) in the southern galactic plane. This included observations of the Magellanic Clouds also. This study used the 36 cm Marsielle telescope at La Silla observatory in the southern hemisphere for data. The telescope was equipped with both a photon counter and a Fabry-Perot interferometer for this study. In 1999 a Marseilles Observatory