GRAVITY (Very Large Telescope)

The instrument works with adaptive optics and provides a resolution of 4 milliarcseconds (mas) and can measure the position of astronomical objects down to a few 10 microarcseconds (μas).

[2] GRAVITY was built by a consortium led by the Max Planck Institute for Extraterrestrial Physics.

[3] Other partner institutes are from France, Germany, Portugal and the European Southern Observatory.

[4] The first light images included the discovery that Theta1 Orionis F in the Trapezium Cluster is a binary.

In the dual-field mode it can interfere two astronomical objects at the same time and acquire this way very accurate astrometry.