La Silla Facilities

ESO 3.6m Cassagrain Cage

La Silla, in the southern part of the Atacama desert, 600 km north of Santiago de Chile and at an altitude of 2400 metres is the home of ESO's original observing site.

Here ESO operates two major telescopes: the 3.6m telescope, and the New Technology Telescope (NTT). They are equipped with state of the art instruments either built completely by ESO or by external consortia, with substantial contribution by ESO.

La Silla Observatory is hosting regularly Visitor Instruments that are attached to a telescope, for the duration of a run of observation and then is removed from the telescope.

La Silla also hosts national telescopes, such as the 2.2-m Max-Planck telescope, 1.2-m Swiss Telescope and the 1.5-m Danish Telescope.


UPDATE October 2020

Due to the COVID-19 pandemic, visitor runs until end of 2020 have been
converted into "designated visitor mode" (dVM). Instructions for dVM
observers are given at the following page:

 Designated Visitor Information

During their run, observers can interact with the telescope/instrument
operator on a remote session, which is described at the following page:

 LOEM Instructions


End of Mission Report News

You will receive an email after your run with a one time password.

In Case of Emergency

In all Emergencies, dial 4444 from any phoning station,
or use beeper (93) code 00
Read the Emergency Procedures