Individual and Junior Members

Professional scientists whose research is directly relevant to some branch of astronomy are eligible to apply as Individual Members. Individual Members are, normally, admitted by the Executive Committee on the proposal of a National Member.

Junior scientists who have completed their PhD studies between 2015 and 2020 and who are in the initial phase of the career of a professional researcher in some branch of astronomy or a related field may be admitted to the Union by the Executive Committee as Junior Members, for a period not exceeding 6 years.

Individual and Junior Members listed in the IAU Directory have a valid, public email, and are affiliated to at least one Division. They are labeled as "Active Members". For corrections and updates, please contact Any members remaining Inactive for more than 3 years will be removed from the IAU lists.

Additionally, while only Active Members are listed in the IAU Directory, you may still search for Active, Inactive or Deceased Members in the search field to your right.

For gender statistics click here.

Total number of IAU Individual and Junior members: 12754 (of which 1224 are Junior members). Number of Active Individual and Junior Members in the IAU Directory: 12383.


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Name▼ Location NCA adherence
Osborne, John L. United Kingdom United Kingdom
Osborne, Julian P. United Kingdom United Kingdom
Oscoz, Alejandro Spain Spain
O'Shaughnessy, Richard W United States United States
Osipova, Aleksandra Anatolyevna (Junior Member) Russian Federation Russian Federation
Oskinova, Lidia M. Germany Germany
Oslowski, Stefan Australia Australia
Osman, Anas Mohamed Egypt Egypt
Osmanov, Zaza Georgia Georgia
Osmer, Patrick S. United States United States
Osório, Isabel Maria T.V.P. Portugal Portugal
Osório, José Pereira Portugal Portugal
Osorio, Mayra Spain Spain
Ospina, Nataly (Junior Member) Spain Spain
Ossendrijver, Mathieu Germany Germany
Osten, Rachel A. United States United States
Østensen, Roy H. Norway Norway
Östlin, Göran T. Sweden Sweden
Ostorero, Luisa Italy Italy
Ostriker, Eve C. United States United States
Ostriker, Jeremiah P. United States United States
Ostrowski, Michał Poland Poland
O'Sullivan, Créidhe Ireland Ireland
O'Sullivan, Ewan United States United States
O'Sullivan, Shane P Australia Australia
O'Sullivan, Stephen Ireland Ireland
Oswalt, Terry D. United States United States
Oszkiewicz, Dagmara Anna Poland Poland
OTA, Naomi Japan Japan
Otarola, Angel Chile United States
Othman, Mazlan Malaysia Malaysia
O'Toole, Simon J. Australia Australia
OTSUKA, Masaaki Japan China, Taipei
OTSUKI, Kaori Japan Japan
Ott, Juergen A. United States United States
Otten, Gilles P.P.L. (Junior Member) China, Taipei France
Otto, Katharina A. (Junior Member) Germany Germany
Otulakowska-Hypka, Magdalena (Junior Member) Poland Poland
OUCHI, Masami Japan Japan
Oudmaijer, Rene United Kingdom United Kingdom
Ouellette, Nathalie Nguyen-Quoc Canada Canada
Ovcharov, Evgeni Petev Bulgaria Bulgaria
Overzier, Roderik A. Netherlands Netherlands
Owen, Frazer Nelson United States United States
Owen, John Michael United States United States
Owens, Mathew J United Kingdom United Kingdom
Owers, Matthew S Australia Australia
Owis, Ashraf H Egypt Egypt
Owocki, Stanley Peter United States United States
OYA, Shin United States United States
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