Atacama Pathfinder EXperiment APEX
Telescope
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The APEX Telescope
Location Llano de Chajnantor
50 Km east of San Pedro de Atacama, Northem Chile
Coordinates

Latitude : 23º00'20.8" South

Longitude :67º45'33.0" West

Altitude : 5105 m

Diameter 12 m
Mass 125000 kg
Main reflector 264 aluminium panels
average panel surface r.m.s. 5 micron
Secondary reflector Hyperboloidal Aluminium
Diameter 0.75m
Mounting Alt-Az
Surface accuracy (r.m.s.) 17 micron
Pointing accuracy (r.m.s.) 2" rms over sky
Pointing accuracy on track 0.6"
Manufacturer Vertex Antennentechnik
Wobbling secondary
Telescope efficiencies
f/D 8
Beam width (FWHM) 7.8" * (800 / f [GHz])
Receiver cabins 2 Nasmyth (A,B) + 1 Cassegrain (C)