urn:nasa:pds:context:telescope:lowell.hall_ritchey-chretien_1_1m07 1.3 1.22.0.0 Product_Context 1.07-m Hall Ritchey-Chretien reflector #1 2026-07-07 1.3 Removed duplicate Internal_Reference entries from Reference_List. 2025-01-07 1.2 Updated schema version. Adding missing "telescope" references. 2022-11-07 1.0 Initial export from OLAF 2023-03-03 1.1 Added reference to nasa42cam urn:nasa:pds:context:facility:observatory.lowell telescope_to_facility urn:nasa:pds:context:instrument:lowell.hall_ritchey-chretien_1_1m07.nasa42cam telescope_to_instrument urn:nasa:pds:context:instrument:lowell.hall_ritchey-chretien_1_1m07.kron_photometer telescope_to_instrument 1.07 248.46447 35.096748 2200 Geodetic - North American (1927) datum The 1.07-meter Hall Ritchey-Chrétien reflector, also known as the John S. Hall Telescope, is located at Lowell Observatory's Anderson Mesa Station near Flagstaff, Arizona. Installed in 1970 and named in honor of former Lowell director John S. Hall in 1990, this telescope has been instrumental in various astronomical studies. In 2004, it underwent significant upgrades, including the installation of a new mirror from Hextek, enhancing its observational capabilities.