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OrganizationUniversity of California, Davis
LocationDaggett, California, US
Coordinates34°52′19″N 116°50′03″W / 34.87187°N 116.83419°W / 34.87187; -116.83419
Altitude610 metres (2,000 ft)
Solar 2 ACTČerenkov 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]

See also[edit]


  1. ^ "History of Solar Two". Archived from the original on July 3, 2008. Retrieved 2009-02-20.
  2. ^ "Solar Two Experimental Solar Facility". Retrieved 2009-05-29.
  3. ^ Going out with a bang | bang, daggett, going - Top Story - Desert Dispatch Archived 2012-02-18 at the Wayback Machine

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