The International Astronomical Union

The International Astronomical Union Our mission is to promote and safeguard the science of astronomy through international cooperation. Of those 73 are National Members.

The International Astronomical Union (IAU) was founded in 1919. Its individual members — structured in Divisions, Commissions, and Working groups — are professional astronomers from all over the world, at the PhD level and beyond, and active in professional research and education in astronomy. The IAU has 10593 Individual Members in 94 countries worldwide. In addition, the IAU collaborates with various scientific organizations all over the world. House Rules
Welcome to the official page for the International Astronomical Union (IAU), where you will find the latest information about the IAU, its activities and more! Thank you for choosing to be a part of our community! We have some “house rules” so that you always know how we can help you and what you can expect from us. If you have any questions, we are available through private messages. Write us a message and you will receive a response within five working days. We will answer questions regarding our activities. Unfortunately, we are not able to answer general questions about astronomy and other topics not directly related to our activities. If you want to send us an image, link or any other material, please send it in a private message. The option to post directly on our timeline is not enabled. We receive many requests, and unfortunately we are not able to share/advertise/promote all of them. As we want to give everyone equal and fair treatment, we have decided not to promote pages, initiatives or other projects with no direct connection to the IAU. If you want to add a comment to a post, please engage in a dialogue based on respect and understanding. We want you to have a useful and pleasant experience on our page, so to ensure that you will enjoy being here, but also to protect you, we will do the best we can to remove from our page the following types of behaviour:

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Join the world's largest professional astronomy society.Applications are open for the International Astronomical Union I...
07/10/2026

Join the world's largest professional astronomy society.

Applications are open for the International Astronomical Union Individual and Junior membership. Eligible candidates must be professional scientists engaged in astronomical research or work in an associated field with a strong focus on astronomy, including in communication, cultural astronomy, data science, education, engineering, history of astronomy, instrumentation or outreach.

A doctoral degree is not a strict requirement. Emeritus faculty and retired scientists who maintain active involvement in the field are also eligible.

Individual and Junior membership is free.

Apply for membership by 15 December 2026.

Review the eligibility criteria and application procedure at:
https://www.iau.org/IAU/News/Ann2026/Call-New-IAU-Members-2027.aspx

The next IAU Researcher in the Spotlight episode will feature Davide Coergo Borga.Hosted by Dr. Giulia De Somma from the...
03/10/2026

The next IAU Researcher in the Spotlight episode will feature Davide Coergo Borga.

Hosted by Dr. Giulia De Somma from the IAU Early Career Working Group, this special event will be in Italian and interview an interviewer. Davide has interviewed many researchers and scientists, and this time he is going to be the one interviewed about his encounters and stories.

After the event, English subtitles will be added to the video and uploaded to YouTube.

IAU Early Career WG: Researcher in the Spotlight Episode 7
Oct 7, 2026
11:00 AM CEST

https://www.iau.org/WG310/WG310/Researcher%20Spotlight%20Series.aspx

Seminar by IAU Commission J1 on Galaxy Spectral Energy Distributions"Semi-resolved stellar populations: features and pro...
02/10/2026

Seminar by IAU Commission J1 on Galaxy Spectral Energy Distributions

"Semi-resolved stellar populations: features and prospects"
🗓️ 5 October 2026, 14:00 UTC
Ignacio Martín Navarro, IAC - Instituto de Astrofísica de Canarias

Abstract:
Stellar population synthesis models implicitly rely on the assumption of a fully sampled initial mass function (IMF). However, with current technological developments pushing towards high angular resolution and ultra deep observations, this assumption does not necessarily hold true. The possibility of an incomplete sampling of the IMF poses therefore a fundamental challenge to all state-of-the art stellar population models currently available. In this talk, I will describe how the same principles and ingredients of the standard evolutionary stellar population synthesis can be naturally combined with a partially sampled IMF. This so-called semi-resolved regime requires profound methodological changes but also offers unique and promising observational opportunities.

https://iau.org/CommissionJ1/CommissionJ1/Meetings.aspx

The IAU Early Career Members Working Group concludes their Summer Talk series with two talks tomorrow, October 02, by tw...
01/10/2026

The IAU Early Career Members Working Group concludes their Summer Talk series with two talks tomorrow, October 02, by two of The Gruber Foundation Fellowship awardees.

1. Dr. Iris de Ruiter
Long-period radio transients and the hunt for their origins
📅 Date: 2 October 2026
🕒 Time: 03:00 UTC

2. Dr. Ignas Juodžbalis
JSWT discovered AGN - from overmassive black holes to little red dots
📅 Date: 2 October 2026
🕒 Time: 09:00 UTC

Join online:
https://iau.org/WG310/WG310/Summer-Talk-Series.aspx

The IAU Division G Working Group on Active B Stars is organising a  seminar on "Census of magnetic chemically peculiar s...
30/09/2026

The IAU Division G Working Group on Active B Stars is organising a seminar on "Census of magnetic chemically peculiar stars in Orion OB1 and lessons we learned from it" by Eugene Semenko, NARIT สถาบันวิจัยดาราศาสตร์แห่งชาติ, Chiang Mai, Thailand.

October 14, 2pm UTC
Join the event https://iau.org/WG104/WG104/News.aspx

Abstract:
Magnetic fields play an important role during all stages of stellar evolution. Unlike solar-like stars, chemically peculiar (CP) stars on the upper main sequence harbor globally organized magnetic fields that remain stable for decades or longer. Studying CP stars allows us to examine the long-term effects of a magnetic field on stellar structure and evolution. Meanwhile, the origin of the magnetic field in CP stars remains debated. In this talk, we present an overview of the magnetic census of CP stars in the stellar association Orion OB1. This association is rich in bright stars, easily accessible from major observational facilities, and shows a gradient in age between its subgroups. A spectropolarimetric survey of mostly B-type peculiar stars in Orion OB1 took place from 2013 to 2021. In a sample of 56 CP stars, we confirmed the decreasing rate of a stellar field with age, found in earlier studies. The occurrence of peculiarities demonstrates the same trend. We find no correlation between stellar rotation and magnetism; we report observations of stars with P_{rot} ≤ 0.5 d in Orion OB1. From the study of individual association members, we highlight the problem of hidden multiplicity caused by the lack of dedicated observations. Finally, we discuss the spatial distribution of CP stars in Orion as a potential indicator of the interstellar origin of their magnetic fields.

The 48th International School for Young Astronomers started today at ICISE - International Centre for Interdisciplinary ...
28/09/2026

The 48th International School for Young Astronomers started today at ICISE - International Centre for Interdisciplinary Science and Education in Quy Nhon, Vietnam.

Twenty eight students from Vietnam, Thailand, Taipei-China, Sri Lanka, Philippines, Nepal, Malaysia, Laos, Indonesia, India and Armenia will attend three weeks of classes, observations, laboratories and astronomy research projects that prepare them for graduate school.

ISYA 2026 is organized by Rencontres du Vietnam and the International Centre for Interdisciplinary Science and Education (ICISE), in collaboration with the International Astronomical Union and the Norwegian Academy of Science and Letters (NASL).

The ISYA program started in 1967 and is almost 60 years old. There are more than 1600 ISYA graduates all around the world.

Join the next seminar in the IAU "H1 - The Local Universe" series. Open to everyone interested in the Milky Way, the Loc...
25/09/2026

Join the next seminar in the IAU "H1 - The Local Universe" series. Open to everyone interested in the Milky Way, the Local Universe (MWLU), and any related topics.

"Two disputes in Galactic bulge/bar morphology" with Martín López-Corredoira, IAC - Instituto de Astrofísica de Canarias

🗓️ Date: 29 September 2026
🕛 Time: 12:00 pm UTC/2:00 pm CEST

Abstract:
We review some ideas and facts and disputes related to the research about the stellar density distribution in the Galactic bulge in the last decades: the discovery of the bulge triaxiality, boxiness, the long-bar as an extra component or as an extension of the own bulge (1st dispute), or the proposal of its X-shape form that has been criticized as an artifact due to an inappropriate use of red clumps as standard candles (2nd dispute).

Join online:
https://iau.org/CommissionH1/CommissionH1/Meetings.aspx

Submit your proposal to host an IAU Symposium in 2028 Symposia are a core activity of the IAU, serving as key drivers of...
24/09/2026

Submit your proposal to host an IAU Symposium in 2028

Symposia are a core activity of the IAU, serving as key drivers of global research by significantly advancing their respective fields, fostering cross-border collaboration, and facilitating in-depth discussions on emerging astrophysical concepts. The IAU intends to provide financial support of 20,000 EUR for each in-person or hybrid symposium.

The IAU received 27 LOIs (Letter of Intent) to host symposia in 2028. All submitted LoIs are now published on the website. We now invite full proposals to be submitted online until 1 December 2026.

https://www.iau.org/IAU/News/Ann2026/Call-full-proposals-2028-Symposia.aspx

The IAU Women in Astronomy Working Group has announced the 2025–2026 IAU STEM Ambassador Awardees, recognising outstandi...
23/09/2026

The IAU Women in Astronomy Working Group has announced the 2025–2026 IAU STEM Ambassador Awardees, recognising outstanding individuals who are actively advancing gender balance, inclusion, and equal opportunities in astronomy and the broader STEM community.

Awardees
Prof. Dr. Gloria Dubner, former Director of the Institute of Astronomy and Space Physics (IAFE, CONICET–UBA)
Dr. Sarah Pearce, SKA-Low Telescope Director, SKA Observatory, Australia
Dr. Lara Rodrigues da Costa Gomes de Sousa, Instituto de Astrofísica e Ciências do Espaço, Centro de Astrofísica da Universidade do Porto, Portugal
Dr. Sheila Kanani, Her Place for Space, United Kingdom
Dr. Alan Alves Brito, Institute of Physics, Federal University of Rio Grande do Sul (UFRGS), Brazil
Dr. Marie Korsaga, Instituto de Astrofísica de Andalucía, Granada, Spain and Université Joseph Ki-Zerbo, Burkina Faso, Africa

We congratulate all the awardees for their contributions and dedication to fostering a more equitable and inclusive astronomical community.

https://iau.org/IAU/News/Ann2026/WiA-STEM-Ambassador-Awards-2025%E2%80%932026.aspx

The world's largest triennial astronomy conference is back!The 33rd IAU General Assembly will take place from August 10-...
21/09/2026

The world's largest triennial astronomy conference is back!

The 33rd IAU General Assembly will take place from August 10-19, 2027 in Rome, Italy. We are pleased to announce the opening of registrations, abstracts and grant applications.

Members of the international astronomy community are invited to submit their scientific contributions and register to participate in this unique global event. The IAU, with the support of partners, offers a limited number of grants to cover the registration fee and other costs.

The is hosted by the INAF National Institute for Astrophysics in Italy.

https://iau.org/IAU/News/Ann2026/GA2027-registration-open.aspx

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