Science Users Information

These pages are aimed at ESO community astronomers and contain all the information required in order to prepare, execute, process and exploit observations with ESO facilities. They also provide information on the scientific activities taking place at ESO. Details can be accessed via the navigation menu.


ESO Science Announcements

ESO Period 116: Deadline

Published: 05 Jul 2025

With the release of the La Silla Paranal telescope schedule, the Phase 2 preparation for runs scheduled in Service Mode begins. The deadline for the submission of the Phase 2 material for Period 116 is Thursday, 7 August 2025.  

Deployment of the Yearly Cycle in ESO Period 117

Published: 04 Jul 2025

As announced in the Newsletter June 2024 and discussed in more detail in the Messenger n. 193, ESO has been planning to move the Call for Proposals to a Yearly Cycle in the course of 2025. The plan has been discussed and consolidated with the Scientific Technical Committee and the Users Committee. Following an intense preparatory phase and after the positive outcome of an internal readiness review, the Director General has approved the move to the Yearly Cycle in P117, for observations starting in May 2026. More details will be provided in the Call for Proposals to be released in mid August.

GRAVITY+ Adaptive Optics with Laser Guide Stars Science Verification on VLTI-UT

Published: 04 Jul 2025

ESO is pleased to announce the Science Verification (SV) for GRAVITY+ Adaptive Optics with Laser Guide Stars on VLTI-UT. The upgraded GRAVITY+ Adaptive Optics (GPAO) offer improved sensitivity and/or performance for the VLTI instruments GRAVITY and MATISSE. For example, under the best atmospheric turbulence conditions, the GRAVITY spectrograph can reach K=19.5 with a fringe tracking source K<13 and a tip-tilt star GRP<17, offering unique opportunities of observations of new classes of astrophysical objects.

“VLT Beyond 2030” ESO Conference, 26-30 Jan 2026, Garching bei München

Published: 02 Jul 2025

ESO is organising a conference, dubbed “VLT beyond 2030”, in Garching near Munich (Germany) on 26-30 January 2026. ESO aims to maintain the VLT and VLTI at the science forefront of astrophysical research in the ELT era. The development of the facilities follows planning that is discussed with the ESO governing bodies to derive the best synergies amongst the facilities. As part of this process, the “VLT beyond 2030” January 2026 meeting will review science topics, emerging technologies and expanding parameter spaces relevant for the VLT/I in the next decade and beyond. 

4MOST Arrives in Paranal

Published: 02 Jul 2025

Nearly all 4MOST components have now arrived at the Paranal Observatory. Meanwhile, the VISTA telescope has been successfully recommissioned following the modifications required to accommodate 4MOST. The reintegration of the various components—such as the spectrographs and fiber positioner—has now begun, with installation on the telescope scheduled over the coming months. Commissioning will continue through the end of the year, with the five-year survey expected to begin in the first half of 2026.

The Messenger

The Messenger 194 is now available. Highlights include:

  • Doyon, R., Bouchy, F. et al.: NIRPS Joins HARPS: Setting New Standards at Infrared Wavelengths
  • Nazari, P., Jerabkova, T. et al.: Artificial Intelligence Usage by ESO Telescope Users
  • De Breuck, C., Díaz Trigo, M.: The Promises and Challenges of the ALMA Wideband Sensitivity Upgrade

The ESO Science Newsletter

The June 2025 issue is now available.

The ESO Science Newsletter, mailed approximately once per month, presents the most recent announcements. Subscription is controlled through the Manage Profile link on the User Portal. Back issues (2013-) are archived.


Citing ESO data in research papers

Researchers are kindly asked to indicate the identifiers (programme IDs or Data DOIs) of the (new or archival) observations they used in their papers as explained in ESO’s data citation policy. This enables the telbib curators to cross-link research output to make data Findabie, Accessible, Interoperable, and Reusable as suggested by the FAIR Principles.  


Pitch Your Research to ESO COMM

Are you an author on an upcoming scientific study based on ESO data that could be relevant to journalists or the wider public? Or are you a Principal Investigator on ESO observations with potential to become stunning images? If so, please consider sending to ESO your paper and/or a preview of the image(s) obtained with ESO telescopes.