Explore below to learn more about the SDSS telescopes, the SDSS spectrographs, and the SDSS imager.
The Sloan Foundation 2.5m Telescope at Apache Point Observatory
The Irénée du Pont Telescope at Las Campanas Observatory
eBOSS / BOSS
The eBOSS spectroscopic survey will continue to use the spectrographs built for BOSS. These two identical spectrographs are rebuilt from the original SDSS spectrographs, which were used for the SDSS Legacy and SEGUE surveys. Each spectrograph has two cameras, one red and one blue, with a dichroic splitting the light at roughly 6000 Å and a full wavelength range from 3600 to 10,400 Å. Additional Information can be found on the BOSS spectrograph page.
APOGEE-2 / APOGEE
The APOGEE-2 survey will continue to use the high-resolution near-infrared spectrograph used for the APOGEE survey. The APOGEE spectrograph is a custom-built multi-object spectrograph which records the spectrum of 300 targets simultaneously across 1.51 to 1.70 micron within the H-band with a nominal resolution of 22,500. Additional Information can be found on the APOGEE spectrograph page.
MaNGA is a galaxy survey which aims to make detailed integral field unit (IFU) resolved spectroscopy measurements of 10,000 nearby galaxies. MaNGA uses the eBOSS / BOSS spectrograph, but instead of placing a single fiber on each galaxy, it uses specially-designed hexagonal ferrules to close-pack the circular fibers into hexagonal bundles. Each MaNGA cartridge contains 17 bundles ranging in size from 19 to 127 fibers, each enabling detailed observations of 17 galaxies simultaneously. Additional Information can be found on the Instrumentation section of the MaNGA surveys page.
MARVELS used a specially-built interferometric spectrograph to obtain high-precision radial velocity measurements of stars looking for exoplanet candidates. In contrast to the more traditional high-resolution echelle spectrographs, MARVELS used a new approach to measuring radial velocities. The spectrograph is a fiber-fed dispersed fixed-delay interferometer (DFDI), a combination of Michelson interferometer and a medium resolution (R~6,000-10,000) spectrograph, which overlays interferometer fringes on a long-slit stellar spectrum. Additional Information can be found on the MARVELS spectrograph page.