WHT
At the WHT, the LIFU (large-integral-field unit) mode of the new multi-object spectrograph WEAVE is offered for open-time observations (30% of the total time available for science) during 2025B. For WEAVE, 2025B actually covers observations from 1 Nov 2025 to 30 Apr 2026. WEAVE has been in regular use for LIFU science since early 2024.

The MOS and mIFU modes of WEAVE are not yet available - they will be offered for science once they are working well and have been fully tested.

On current plans, WEAVE will remain on the telescope throughout 2025 and 2026, so observations will not be possible with the Cassegrain instuments (ISIS, LIRIS, ACAM) or with visiting instruments at any WHT focus, during this period.

INT
Visitor-mode observations at the INT ceased in mid-June 2024, and the telescope has been refurbished and roboticised, prior to installation of the HARPS-3 exoplanet hunter in 2025. No observing time is offered at the INT in 2025B. It may be possible to offer open-time observing with HARPS-3 in 2026A.

Notes
The latest news about the ongoing evolution of the instrumentation suite at the WHT and INT can be found on the ING instrumentation update page.

Information about how to apply for telescope time can be found on the applying for telescope time page.

Information about pre-WEAVE WHT instruments not offered in 2025 and 2026 (e.g. ISIS, ACAM) is linked from a previous version of this page. Information about instruments no longer offered at ING can be found on the page about past, present and future instruments.