H.E.S.S. collaboration

What H.E.S.S. collaboration does

The H.E.S.S. (High Energy Stereoscopic System) Collaboration is an international scientific research consortium operating a ground-based gamma-ray observatory in the Khomas Highland of Namibia, approximately 100 km southwest of Windhoek at 1,800m elevation. The collaboration studies very-high-energy (VHE) gamma rays in the energy range of approximately 0.1–100 TeV, using a system of five imaging atmospheric Cherenkov telescopes (IACTs): four 12-meter telescopes (CT1-4, operational since 2004) and one larger 28-meter telescope (CT5, added in 2012). The telescopes detect atmospheric Cherenkov light produced when gamma rays interact with Earth's upper atmosphere, and the multi-telescope stereoscopic arrangement enables accurate reconstruction of gamma-ray events from cosmic sources such as pulsars, supernova remnants, active galactic nuclei, blazars, and gamma-ray bursts.

Key technical components include the FlashCam digital camera on CT5 (with 1,764 photomultiplier tubes, 250 MS/s digitization, and FPGA-based real-time processing, installed in 2019) and the ATOM optical monitoring telescope, which provides simultaneous multi-wavelength observations. The collaboration is governed by a cost-sharing arrangement among partner institutions — most prominently CNRS/IN2P3 in France and the Max Planck Society (notably MPIK) in Germany — and involves over 300 scientists from more than 100 institutions across multiple countries. It does not generate commercial revenue; operating costs are covered by institutional research funding.

Scientific output includes peer-reviewed publications in journals such as Astronomy & Astrophysics, Nature, and Science, a 15-year GRB observational catalogue (107 GRBs, released 2026), an extragalactic sky survey, monthly "Source of the Month" features, public test data releases, and external observing proposal programs. The collaboration also maintains a technology-development relationship with the Cherenkov Telescope Array Observatory (CTAO), positioning FlashCam as a pathway instrument for the next-generation global VHE gamma-ray facility.

Name

H.E.S.S. collaboration

Legal name

H.E.S.S. Collaboration

Website

https://hess-experiment.eu

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

51–100 employees

Short description

The H.E.S.S. Collaboration is an international non-profit consortium operating a ground-based gamma-ray observatory of five Cherenkov telescopes in Namibia, serving the global astrophysics research community via VHE gamma-ray observations, publications, and public data releases funded by member institutions.

Ownership category

akta.pro rank

Headquarters

HQ city

Windhoek

HQ country

Namibia

HQ region

Africa

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Technology or R&D, Infrastructure, Operations

Marketing channels4 records

Core offering

H.E.S.S. operates a ground-based observatory consisting of five imaging atmospheric Cherenkov telescopes located in Namibia that detect very-high-energy (VHE) gamma rays (~0.1–100 TeV) from astrophysical sources via atmospheric Cherenkov light. The array combines four 12-metre telescopes (CT1–CT4) with a central 28-metre telescope (CT5), enabling stereoscopic reconstruction of gamma-ray events and supporting extragalactic sky surveys, gamma-ray burst follow-ups, and simultaneous optical monitoring through the ATOM telescope.

Product overview

H.E.S.S. (High Energy Stereoscopic System) is a ground-based gamma-ray observatory consisting of five imaging atmospheric Cherenkov telescopes (IACTs) located in Namibia. The array includes four 12-meter telescopes (CT1-4, operational since 2001-2003) and one 28-meter telescope (CT5, added in 2012). The telescopes detect very-high-energy gamma rays (0.1–100 TeV) through Cherenkov light emitted by atmospheric particle cascades. Key products include the H.E.S.S. Telescopes for gamma-ray observation, the H.E.S.S. Extragalactic Sky Survey for cataloguing extragalactic sources, GRB observations for gamma-ray burst follow-up, the ATOM optical monitoring telescope for simultaneous multi-wavelength observations, public data releases, and FlashCam camera technology for the large telescope. The collaboration publishes scientific results through journals, conferences, and the Source of the Month series.

Differentiator

Problem solved

Functional benefit

Products and services

• H.E.S.S. Telescopes A system of five imaging atmospheric Cherenkov telescopes (four 12-m CT1–CT4 plus one 28-m CT5) operated at the H.E.S.S. site in Namibia, sensitive in the 0.1–100 TeV gamma-ray range, available to the international scientific research community through the H.E.S.S. Collaboration.
• FlashCam Camera State-of-the-art digital camera for the CT5 telescope with a photodetector plane of 147 modules (1,764 photomultiplier tubes), 250 million samples per second digitisation, and FPGA-based real-time processing for nanosecond-scale detection of atmospheric Cherenkov flashes.
• ATOM (Automatic Telescope for Optical Monitoring) 80 cm Ritchey-Chrétien optical telescope co-located at the H.E.S.S. site in Namibia, providing simultaneous optical monitoring of gamma-ray sources, dual-channel blue/red observation, polarimetry, EMCCD imaging with millisecond integration times, and trigger signals for target-of-opportunity observations.
• H.E.S.S. Gamma-Ray Burst (GRB) Observations Programme A long-running follow-up observation programme of gamma-ray bursts detected by satellite experiments, with a 15-year observational catalogue published in 2026 covering 107 GRBs — the largest VHE GRB dataset released.
• H.E.S.S. Extragalactic Sky Survey Survey programme cataloguing very-high-energy gamma-ray sources beyond the Milky Way, including blazars and other extragalactic objects, with a Source of the Month feature published in May 2026.
• Public Test Data Release Publicly released test datasets from H.E.S.S. observations made available to the broader scientific community through the releases page of the official website.

Segments1 record

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Five partnerships are on record, tiered core and supporting.

• Max Planck Institute for Nuclear Physics (MPIK)coreStrategic or Co-development PartnerMPIK is a key German partner in the H.E.S.S. collaboration, contributing to telescope development, camera systems (including FlashCam), and scientific research programs.
• French National Institute for Nuclear and Particle Physics (IN2P3/CNRS)coreStrategic or Co-development PartnerIN2P3 coordinates French involvement in H.E.S.S., hosting the primary collaboration website and contributing to multiple institutional teams including LLR.
• Cherenkov Telescope Array Observatory (CTAO)coreStrategic or Co-development PartnerH.E.S.S. collaborates with CTAO on next-generation camera technology. FlashCam, developed for H.E.S.S. CT5, was originally developed for CTA's future southern array. Lessons learned with H.E.S.S. will be vital for CTAO operations.
• University of Erlangen, Tübingen, and InnsbrucksupportingTechnology or IntegrationThese German and Austrian universities collaborated with MPIK on the FlashCam project, contributing to development of the advanced camera system for ground-based IACTs.
• Fermi Gamma-Ray Space Telescope TeamsupportingTechnology or IntegrationCollaboration with NASA's Fermi-LAT instrument for coordinated gamma-ray observations, including GRB follow-up programs and blazar monitoring.

Scale indicators4 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• HAWC Observatory: High-Altitude Water Cherenkov gamma-ray observatory at Sierra Negra, Mexico. Also detects very-high-energy gamma rays (using water tanks rather than optical telescopes); comparable scientific mission in surveying the TeV sky with overlapping source catalogs and concurrent operations.
• MAGIC Collaboration: Two 17m IACTs at the Roque de los Muchachos Observatory in La Palma, Spain. Comparable very-high-energy gamma-ray detection technology to H.E.S.S. and direct peer within the international IACT community; overlaps in source targets and analysis techniques.
• VERITAS: Four-telescope IACT array at the Fred Lawrence Whipple Observatory in Arizona. Closely comparable imaging atmospheric Cherenkov technology to H.E.S.S., operating in the same 0.1-10 TeV range but in the Northern Hemisphere; serves as H.E.S.S.'s primary hemisphere-complementary counterpart.
• Cherenkov Telescope Array Observatory (CTAO): Next-generation global IACT array under construction in Chile and La Palma. Directly comparable technology (Imaging Atmospheric Cherenkov Telescopes) for very-high-energy gamma-ray astronomy; H.E.S.S. is explicitly a technological pathfinder for CTAO's southern array via FlashCam.

Broad incumbents

• Fermi Gamma-ray Space Telescope (NASA): Space-based gamma-ray observatory operating the LAT and GBM instruments. Covers overlapping science (gamma-ray bursts, blazars, pulsars) at lower energies (keV–GeV) and is a coordinated follow-up partner of H.E.S.S. for GRB and blazar monitoring programs.
• IceCube Neutrino Observatory: Cube-kilometer neutrino detector at the South Pole. Comparable as a multi-messenger astrophysics facility pursuing cosmic-ray and high-energy particle astronomy; shares science themes (cosmic accelerators, transient alerts, multi-wavelength campaigns) with H.E.S.S. despite different detection modality.
• Pierre Auger Observatory: Largest cosmic-ray air-shower detector in Argentina. Peer in ground-based high-energy astroparticle physics, addressing adjacent questions about ultra-high-energy cosmic rays and serving comparable international scientific community.

Emerging players

• Tibet AS-gamma Experiment: High-altitude air-shower array in Tibet detecting cosmic rays and gamma rays at TeV–PeV energies. Comparable scientific mission to H.E.S.S. in very-high-energy astrophysics, though uses particle detector arrays rather than optical Cherenkov telescopes.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/HESSTelescopes
• LinkedInlinkedin.com/company/hess-telescopes

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

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M&A

Investments

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Frequently asked questions about H.E.S.S. collaboration