Isaac Newton Telescope

The Isaac Newton Telescope (INT) is a 2.54-m reflector telescope at the Roque de los Muchachos Observatory (ORM) in the Canary Islands. It is one of the Isaac Newton Group of Telescopes (ING), which also includes the William Herschel Telescope (WHT). INT was rebuilt at ORM in 1984 after earlier operation in England that began in 1967. As of 2025, INT is currently not carrying out observation, dedicated to the commissioning of the new a high resolution spectrograph, HARPS3 (for the Terra Hunting Experiment) with hopes of resuming operation in 2025 or 2026. Among INT's other instruments:

• WFC - wide field camera.
• IDS - intermediate dispersion spectrograph.

Past:

• FOS-1 - faint object spectrograph.
• PFC - prime focus camera.
• TAURUS-1 - Fabry-Pérot spectrograph and imager.