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ASTRON is responsible for the operations of the Westerbork Synthesis Radio Telescope (WSRT) and the Low Frequency Array (LOFAR).


The astronomical research at ASTRON is closely aligned with the strengths of our facilities LOFAR and WSRT-APERTIF.

Diversity & Sustainability

ASTRON is committed to achieving a fair, welcoming, and sustainable work environment for all.


Met onze radiotelescopen nemen wij de meest zwakke signalen uit het heelal waar. Daardoor zijn zij kwetsbaar voor elektromagnetische storing. Met het tijdig treffen van de juiste maatregelen kan storing worden voorkomen.

Wireless Data Lab

Draadloze techniek lijkt vanzelfsprekend, maar de ontwikkeling ervan gaat niet vanzelf. Daarom hebben we bij ASTRON een proeftuin ingericht; het Wireless Data Lab.

Making discoveries
in radio astronomy

ASTRON is the Netherlands Institute for Radio Astronomy, and is part of the Institutes organisation of NWO.

ERC Starting Grant Awarded to Dr. Aditya Parthasarathy

The European Research Council (ERC) has awarded Dr. Aditya Parthasarathy a prestigious and extremely competitive grant to pursue his research at ASTRON, the Netherlands Institute for Radio Astronomy.

Published by the editorial team, 5 September 2023

Radio waves leaking from large satellite constellations could jeopardize astronomical exploration

The LOFAR radio telescope has shown that satellites can unintentionally emit radio waves that interfere with the observations of radio telescopes. Satellites circle the globe in ever increasing numbers. Their radio emission could, if not addressed, close unique and scientifically valuable windows into the Universe. It is of crucial importance for the astronomy sector and industry to collaborate to overcome these issues and for the International Telecommunications Union to establish regulation to control this emission.

Published by the editorial team, 5 July 2023

Pulsar clocks open new window on gravitational waves

An international collaboration of European astronomers, together with Indian and Japanese colleagues, have seen evidence for ultra-low-frequency gravitational waves, which is expected to originate from pairs of supermassive black holes found in the centres of merging galaxies. This is the result of more than 25 years of observations with the most sensitive radio telescopes in Europe and India, including the Westerbork Synthesis Radio Telescope (WSRT). In doing so, they have opened a new window on gravitational wave research. These gravitational waves contain information about the Universe's best-kept secrets. The research has been published in a series of articles in the professional journal Astronomy & Astrophysics.

Published by the editorial team, 29 June 2023

Astronomers discover Fast Radio Bursts that skewer nearby Galaxy

Astronomers have found five new Fast Radio Bursts with the upgraded Westerbork radio telescope array. The telescope images revealed that multiple bursts had pierced our neighbouring Triangulum Galaxy. This allowed the astronomers to determine the maximum number of otherwise invisible atoms in this galaxy for the first time.

Published by the editorial team, 12 April 2023

ERC Advanced Grant for research into the origin of fast radio bursts from space

Animation explaining the workings of LOFAR

NAC 2023 to be held in Leeuwarden in May

ASTRON astronomy groups focus on LOFAR and SKA

Major upgrade of International LOFAR Telescope approved

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Colloquium: An updated mass-radius analysis of the 2017-2018 NICER data set of PSR J0030+0451

© Serena Vinciguerra

In 2019 the NICER collaboration published the first mass and radius inferred for PSR J0030+0451, thanks to NICER observations, and consequent constraints on the equation of state characterising dense matter. Two independent analyses found a mass of ~ 1.3-1.4 Msun and a radius of ∼13km. They also both found that the hot spots were all located on the same hemisphere, opposite to the observer, and that at least one of them had a significantly elongated shape. Here we reanalyse the same NICER data set, incorporating the effects of an updated NICER response matrix and using an upgraded analysis framework. We expand the adopted models and jointly analyse also XMM-Newton data, which enables us to better constrain the fraction of observed counts coming from PSR J0030+0451. We find a multi-modal structure in the posterior surface, which becomes crucial especially when XMM-Newton data is accounted for. Including the corresponding constraints disfavors the main solutions found previously, in favor of new and more complex models. These have inferred masses and radii of ~[1.4 Msun, 11.5 km] and ~[1.7 Msun, 14.5 km], depending on the assumed model. They display configurations that do not require the two hot spots generating the observed X-rays to be on the same hemisphere, nor to show very elongated features, and may point instead to the presence of temperature gradients and the need to account for them.

ASTRON daily image.

Open dag

Sun 08 Oct 2023

Op zondag 8 oktober organiseren ASTRON en Stichting LofarTafel samen met Het Drentse Landschap een open dag in de LofarZone tussen Buinen en Exloo, waar het hart ligt van LOFAR, de grootste radiotelescoop ter wereld! Onze open dag vindt dit jaar dus NIET plaats in Dwingeloo. Er worden excursies over natuur en astronomie gegeven, er […]


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