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 10 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.

Total number of IAU Individual and Junior members: 13587 (of which 533 Junior members). Number of Active Individual and Junior Members in the IAU Directory: 11098.


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Name Location NCA adherence▼
Orellana, Rosa B. Argentina Argentina
Orellana, Mariana Argentina Argentina
Olano, Carlos A. Argentina Argentina
Orsatti, Ana María Argentina Argentina
Oslowski, Stefan Australia Australia
Orchiston, Wayne Australia Australia
O'Byrne, John W. Australia Australia
Owers, Matthew S Australia Australia
O'Sullivan, Shane P Australia Australia
O'Toole, SIMON J. Australia Australia
Onken, Christopher Alan Australia Australia
Obreschkow, Danail Australia Australia
Overzier, Roderik A. Brazil Brazil
Oliveira, Alexandre S. Brazil Brazil
Ortiz, Roberto Brazil Brazil
Ogando, Ricardo Lourenço Correia Brazil Brazil
Ovcharov, Evgeni Petev Bulgaria Bulgaria
O'Dea, Christopher P. Canada Canada
Ouellette, Nathalie Nguyen-Quoc (Junior Member) Canada Canada
Ohnaka, Keiichi Chile Chile
OTSUKA, Masaaki Japan China, Taipei
Orlitová, Ivana Czech Republic Czech Republic
Olsen, Erik H. Denmark Denmark
Olsen, Hans Jørn Fogh Denmark Denmark
Owis, Ashraf H Egypt Egypt
Oja, Heikki Finland Finland
Ochsenbein, François France France
Omont, Alain France France
Ocvirk, Pierre France France
Oberst, Jürgen Germany Germany
Oskinova, Lidia M. Germany Germany
Oldengott, Isabel Mira (Junior Member) Germany Germany
Ofir, Aviv Israel Germany
Ossendrijver, Mathieu Germany Germany
Ortiz Leon, Gisela Noemi (Junior Member) Germany Germany
Olah, Katalin Ilona Hungary Hungary
Oberoi, Divya India India
Ojha, Devendra Kumar India India
O'Sullivan, Denis F. Ireland Ireland
O'Sullivan, Créidhe Ireland Ireland
Ofek, Eran Oded Israel Israel
Orosei, Roberto Italy Italy
Olmi, Luca Italy Italy
Orienti, Monica Italy Italy
Ortolani, Sergio Italy Italy
Ostorero, Luisa Italy Italy
Orlando, Salvatore Italy Italy
Origlia, Livia Italy Italy
Orio, Marina Italy Italy
Oliva, Ernesto Italy Italy
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