The NANTEN2 Telescope

 

dishIn mid 2004, the NANTEN telescope moved from Las Campanas, Chile, where it was located since 1995, to its new site on Pampa la Bola in the Chilean Atacama desert (see the Picture section).

The telescope was upgraded with a new submillimeter dish, a new subreflector, and an improved drive system. It is housed inside a dome to protect it from severe weather conditions and high wind speeds.

Right: The NANTEN2 main reflector and subreflector in their container after arrival at Antofagasta.

The telescope is a 4 m Cassegrain system, whose main reflector was manufactured by Mitsubishi. It consists of 33 aluminum panels that are adjustable with actuators (3 for each panel), and a light-weight carbon fibre back structure. After adjustment of the main reflector using photogarmmetry and holography in late 2005, the expected surface accuracy is 20 micron rms. All receivers will be mounted on one Nasmyth port.

See this page for a collection of technical drawings.

Specifications

Type Cassegrain
Aperture 4 m
f/D  
Main reflector 33 aluminum panels
back structure carbon fibre
weight  

Observing frequencies and angular resolutions

Observed Frequency

Wave length

Angular resolution
Main beam efficiency*
(GHz)
(micron)
   
115
2600
180"
 
230
1300
90"
 
345
870
60"
 
460
650
45"
 
490
610
40"
0.50
809
370
25"
0.45
880
340
22"
 

*Estimates based on an assumed rms surface accuracy of 20 micron.