urn:nasa:pds:context:telescope:orm.int2m54 1.1 1.19.0.0 Product_Context 2021-09-22 1.0 Initial export from OLAF 2023-03-02 1.1 Added reference to ids and wfc urn:nasa:pds:context:instrument:orm.int2m54.wfc telescope_to_instrument urn:nasa:pds:context:instrument:orm.int2m54.ids telescope_to_instrument urn:nasa:pds:context:facility:observatory.orm telescope_to_facility 2.54 342.12236 28.762056 2336 Geodetic - WGS 84 datum The Isaac Newton Telescope or INT is a 2.54 m (100 in.) optical telescope run by the ING at Roque de los Muchachos Observatory on La Palma in the Canary Islands since 1984. The La Palma INT is a Cassegrain telescope, with a 2.54 m diameter primary mirror and a focal length of 8.36 m. The f/3.29 Prime focus, used with the Wide Field Camera, allows an unvignetted field of view of 33 arcminutes (approximately 0.3 square degrees). There is also a secondary focal station, the f/15 Cassegrain focus, which possesses a 20 arcminute field of view and is the mount point for the Intermediate Dispersion Spectrograph. The pointing accuracy of the telescope is around 5 arcseconds, but a sophisticated autoguider, which tracks a given guide star and makes small corrections to the telescope tracking, allows a guiding accuracy of better than an arcsecond on better than 20th magnitude guide stars in support of the typical 0.8-1.5 arcsec seeing at the INT.