urn:nasa:pds:context:telescope:naoj-hawaii.subaru_8m2 1.0 1.11.0.0 Product_Context Subaru Telescope 2018-09-21 1.0 Created from information from IRTF website: http://irtfweb.ifa.hawaii.edu urn:nasa:pds:context:facility:observatory.naoj-hawaii telescope_to_facility urn:nasa:pds:context:instrument:naoj-hawaii.subaru_8m2.comics telescope_to_instrument 8.2 155.4761 19.82556 4139 The Subaru Telescope is a Ritchey-Chretien reflecting telescope. Instruments can be mounted at a Cassegrain focus below the primary mirror; at either of two Nasmyth focal points in enclosures on the sides of the telescope mount, to which light can be directed with a tertiary mirror; or at the prime focus in lieu of a secondary mirror, an arrangement rare on large telescopes, to provide a wide field of view suited to deep wide-field surveys. Longitude and latitude, above, are provided in the NAD83 coordinate system. Altitude elevation axis is at 4163 m. Telescope size measures 22.2 m in height, with a maximum width of 27.2 m, weighing 555 t. The primary mirror has an effective diameter of 8.2 m with a thickness of 22 cm weighing 22.8 t. Composed of ULE (ultra-low thermal expansion glass), the mean surface error is 14 nm, with a focal length of 15 m. Various foci are as follows: primary focus is F/2.0 (with corrector); Cassegrain focus is F/12.2; Nasmyth foci are F/12.6 (optical) and F/13.6 (infrared). All is contained within a cylindrical enclosure rotating with telescope, with a height of 43 m and diameter at the base of 40 m, weighing 2000 t. Information from both facility and telescope websites: (as of 10/05/18) https://www.nao.ac.jp/en/ https://www.subarutelescope.org/Introduction/telescope.html