AMBER - Astronomical Multi-BEam combineR


AMBER, the near-infrared/red focal instrument of the VLTI, operates in the bands J, H, and, K (ie 1.0 to 2.4 μm). The instrument has been designed to be used with two or three beams, allowing to measure the closure phase. Its angular resolution is set by the maximum separation of the telescopes and the field of view of the instrument. In a nutshell, AMBER is able to resolve features between2mas (milli-arcsecond) and 50mas with the UTs, and between 2mas and 140 mas with the ATs.

AMBER is used with an external fringe tracker FINITO. On the UTs it is possible to reach H=7. On the AT's, the limiting magnitude is H=5. The complete pre-requisites for AMBER service observations and the most magnitude limits can be found on the instrument description page.


Publications based on data obtained with the AMBER instrument should quote the following reference paper:
Petrov, R.G., et al. AMBER, the near-infrared spectro-interferometric three-telescope VLTI instrument, 2007, A&A, Vol. 464, Issue 1, pp.1-12.

Contact Information

  • Questions related to service mode observations and proposal preparation should be addressed to the User Support Department.
  • Questions related to visitor mode observations should be addressed to Paranal Science Operations
  • Questions related to AMBER should be addressed to the AMBER account
  • Please send us your comments, suggestions and report errors and inaccurate statements in the web pages and manuals.

See also the Instrument Operation Team and the AMBER Consortium web pages.

Content of these pages

The following items are available on all the AMBER pages, using the bar on the left.

  • News: list of changes affecting the instrument and/or its pages.
  • Overview: a short description of the instrument
  • Instrument Description: all the important parameters of the instrument.
  • Manuals: links to all the documents related to AMBER.
  • Tools: a collection of useful tools and informations for preparing and analyzing the AMBER observations.
  • Instrument Operations Team
  • Links: miscellaneous links about interferometry and AMBER.
  • Visitor Instructions: Instrument specific instructions for Visiting Astronomers
  • Consortium: A list of the AMBER Consortium contributing Institutes.