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Organization University of California, Davis
Location Daggett, California, US
Coordinates 34°52′19″N 116°50′03″W / 34.87187°N 116.83419°W / 34.87187; -116.83419
Altitude 610 metres (2,000 ft)
Established 2001-2004
Closed 2005
Solar 2 ACT Čerenkov air shower
CACTUS is located in Earth
Location of CACTUS

CACTUS (Converted Atmospheric Cherenkov Telescope Using Solar-2) was a ground-based, Air Cherenkov Telescope (ACT) located outside Daggett, California, near Barstow. It was originally a solar power plant called Solar Two, but was converted to an observatory starting in 2001. The first astronomical observations started in the fall of 2004. However, the facility had its last observing runs in November 2005 as funds for observational operations from the National Science Foundation were no longer available.[1] The facility was operated by the University of California, Davis but owned by Southern California Edison.[2] It was demolished in 2009.[3]

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