MARVEL

MARVEL (for Mercator Array for Radial Velocities) is an array under construction of four 0.8-m visible light telescopes all attached to an RV spectrograph designed to measure radial velocities down to 1 m/s. Fiber from each telescope leads to the spectrograph, each telescope measuring an individual star, or more than one telescope used together gather more light to measure a fainter star. MARVEL is located at Roque de los Muchachos Observatory (ORM) as an extension of the Mercator Telescope facility, termed Mercator Observatory. The four telescopes are "commercial off-the-shelf", reducing the cost of the telescopes, and gaining some benefits, among them, the ability to carry out simultaneous such observations. Plans as of 2024 were for first light in 2025.

Note that the similar name, MARVELS, was used for an SDSS-III survey that searched for extra-solar planets using the RV method, the survey having a purpose-built spectrograph, likely sometimes referred to as the MARVELS spectrograph.