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Chile Flag USA Flag Atacama Cosmology Telescope (ACT) Observatory, Chile

The Atacama Cosmology Telescope (ACT) is a six-meter telescope designed to make high-resolution, microwave-wavelength surveys of the sky in order to study the Cosmic Microwave Background Radiation (CMB). At an altitude of 5,190 meters (17,030 feet), it’s one of the highest permanent, ground-based telescopes in the world. The ACT is an off-axis Gregorian telescope, with a six meter primary mirror and a two meter secondary mirror. Unlike most telescopes which track the rotating sky during observation, the ACT observes a strip of sky, typically five degrees wide, by scanning back and forth in azimuth at the relatively rapid rate of two degrees per second. An outer ground screen surrounding the telescope minimises contamination from microwave radiation emitted by the ground.

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ACT Logo
Page "Cerro Paranal VLT" |  Page "Cerro Armazones E-ELT" |  Page "Llano de Chajnantor ALMA" |  This is page "Atacama Cosmology Telescope ACT"
Panoramic Cerro Toco Atacama Cosmology Telescope Installation ACT
Panoramic view of the Atacama Cosmology Telescope installation (ACT) on the Cerro Toco; telescope on the far right

Six Meter Atacama Cosmology Telescope ACT Right
Six-meter Atacama Cosmology Telescope
(ACT) on the right

Auxiliary Antenna Atacama Cosmology Telescope ACT
Auxiliary antennas at the
Atacama Cosmology Telescope (ACT)

Control Screen Atacama Cosmology Telescope ACT
Control screen at the
Atacama Cosmology Telescope (ACT)

Control Room Atacama Cosmology Telescope ACT
Control room at the
Atacama Cosmology Telescope (ACT)

Page "Cerro Paranal VLT" |  Page "Cerro Armazones E-ELT" |  Page "Llano de Chajnantor ALMA" |  This is page "Atacama Cosmology Telescope ACT"

Last page update on May 15, 2016.
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