Specifications

The Atacama Cosmology Telescope (ACT) is a custom six-meter telescope that is located in northern Chile. 
It has the following properties (Swetz et al. 2010): (link is external)

PHYSICAL PROPERTIES OF THE TELESCOPE AND OPTICS

Telescope Properties
 
Location
 
Telescope height
12 m
Altitude
5190 m
Ground screen height
13 m
Longitude
67° 47' 15"W
Total mass
52 t
Latitude
22° 57' 31"S
Moving Structure mass
40 t
 
 

Optics

f-numbera
2.5
Azimuth range
±220°
FOV
1 deg2
Max. az speed
2°/s
Primary reflector Dia
6m
Max. az acc.
10°/s2
No. primary panels
71
Elev. range
30.°5 - 60°
Secondary reflector Dia
2m
Max. elev speed
0.2°/s
No. secondary panels
11
 
 

aAt telescope Gregorian focus

ACT observes simultaneously in three frequency bands centered on 148 GHz, 218 GHz, and 277 GHz. These are often called AR1, AR2, and AR3 respectively. Celestial radiation in each band is imaged onto 32 X 32 arrays of transition-edge sensor (TES) bolometers. The arrays have the following properties: