Hat Creek Radio Observatory

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Constructing 85-foot dish

The Hat Creek Radio Observatory (HCRO) is operated by the Radio Astronomy Laboratory (an Organized Research Unit of the Astronomy Department at the University of California, Berkeley). It is located approximately 467 km (290 miles) north-east of San Francisco, California at an elevation of 1280m (4200 ft) above sea level in Hat Creek, California (in Shasta County).

[edit] History

HCRO was founded in the late 1950s by the newly created Radio Astronomy Laboratory of the University of California, Berkeley. An 85-foot antenna was installed in 1962 and operated until 1993, when it collapsed during a wind storm. Using it, astronomers discovered the first interstellar maser. The earliest experiments in millimeter-wave astronomy were performed at this site starting in the 1970 when a 2-element interferometer was constructed. From 1980-1985 a 3-element interferometer was constructed, with another four antennas added between 1990-1992. After the 85-foot dish was lost, another three antennas were added to the millimeter array for a total of ten elements. This came to be known as BIMA. The BIMA telescopes were moved in the spring of 2005 to be combined with other millimeter antennas as part of the Combined Array for Research in Millimeter-wave Astronomy (CARMA) project and to make way for the Allen Telescope Array (ATA).