urn:nasa:pds:context:telescope:gemini_north-maunakea.8m1 1.0 1.15.0.0 Product_Context 2022-02-24 1.0 Initial export from OLAF urn:nasa:pds:context:instrument:gemini_north-maunakea.8m1.gmos_n telescope_to_instrument urn:nasa:pds:context:facility:observatory.gemini_north-maunakea telescope_to_facility 8.1 204.53096 19.823807 4213 Aerial survey - North American (1983) datum The information is adapted from the Gemini website. The Gemini Observatory consists of twin 8.1-meter diameter optical/infrared telescopes located on two of the best observing sites on the planet. From their locations on mountains in Hawai'i and Chile, Gemini Observatory's telescopes can collectively access the entire sky. The Frederick C. Gillett Gemini North telescope is located on Hawaii's Mauna Kea as part of the international community of observatories built to take advantage of the superb atmospheric conditions on this long dormant volcano which rises about 4,214 meters (13,824 feet) into the dry, stable air of the Pacific. Primary Mirror: Diameter: 8.1 meters/26.58 feet/319 inches Mass: 22.22 metric tonnes/24.5 U.S. tons Composition: Corning Ultra-Low Expansion (ULE) Glass Surface Accuracy: 15.6 nm RMS (Between 1/1000 - 1/10,000 thickness of human hair)