urn:nasa:pds:context:instrument:irtf-maunakea.3m2.primo_1 1.0 1.16.0.0 Product_Context urn:nasa:pds:context:instrument:irtf.3m0.primo_1 2021-12-07 1.0 per RMS, deprecated irtf in favor of irtf-maunakea urn:nasa:pds:context:telescope:irtf-maunakea.3m2 instrument_to_telescope Primo I Photometer Photometer Primo I is a photomultiplier detector used with a set of infrared filters at the IRTF telescope on Mauna Kea.