Siderostat at the VLT platform

One of the two Siderostats, 0.3-metre fixed telescopes used to feed the VLTI instrument VINCI during test and early science phases. The VLT Interferometer (VLTI) combines the light captured by two or three 8.2-metre Unit Telescopes (UTs) or two or three 1.8-metre Auxiliary Telescopes (ATs), allowing astronomers to see details up to 25 times finer than with the individual telescopes. While the VLT´s ATs are entirely dedicated to interferometry, the VLT´s UTs can work either individually or together in groups of two or three.