![]() The Irénée du Pont Telescope at Las Campanas Observatory: The new fourth phase of the SDSS includes observations from the Southern Hemisphere for the first time. The telescope had first light in 1998 May and began regular survey operations in 2000. The unusual requirement of very low distortion is set by the demands of time-delay-and-integrate (TDI) imaging.Ģ) Very high precision motion to support open-loop TDI observations.ģ) A unique wind baffle/enclosure construction to maximize image quality and minimize construction costs. Novel features of the telescope include the following:ġ) A 3° diameter (0.65 m) focal plane that has excellent image quality and small geometric distortions over a wide wavelength range (3000-10,600 Å) in the imaging mode, and good image quality combined with very small lateral and longitudinal color errors in the spectroscopic mode. ![]() The telescope is instrumented by a wide-area, multiband CCD camera and a pair of fiber-fed double spectrographs. The telescope is a modified two-corrector Ritchey-Chrétien design with a 2.5 m, f/2.25 primary, a 1.08 m secondary, a Gascoigne astigmatism corrector, and one of a pair of interchangeable highly aspheric correctors near the focal plane, one for imaging and the other for spectroscopy. ![]() Sloan Foundation (New York City), which contributed significant funding. The project was named after the Alfred P. ![]() SDSS is a major multi-spectral imaging and spectroscopic redshift survey using a dedicated 2.5-m wide-angle optical telescope at Apache Point Observatory (APO) in south-east New Mexico, United States (Latitude 32° 46' 49.30" N, Longitude 105° 49' 13.50" W, Elevation 2788m). Initiatives and Programs SDSS (Sloan Digital Sky Survey) ![]()
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