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Apache Point Observatory
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=== 0.5 m ARCSAT === The ARC Small Aperture Telescope (ARCSAT) was previously called the Photometric Telescope (PT) when it was part of the SDSS project. It is a {{convert|0.5|m|in|abbr=on}} reflecting telescope on an [[equatorial mount]], with a single CCD camera cooled by a CryoTiger unit.<ref name="20IN" /> It was built in 1991, moved from its previous location in 1998, and used by the SDSS until 2005.<ref name="20INHIST" /> It is currently used for small research projects.
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