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: 12737 (of which 1224 are Junior members). Number of Active Individual and Junior Members in the IAU Directory: 12372.


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Name Location▼ NCA adherence
Orsatti, Ana María Argentina Argentina
Olano, Carlos A. Argentina Argentina
Orellana, Rosa B. Argentina Argentina
Orellana, Mariana Argentina Argentina
Onken, Christopher Alan Australia Australia
O'Byrne, John W. Australia Australia
Oslowski, Stefan Australia Australia
O'Sullivan, Shane P Australia Australia
Orchiston, Wayne Australia Australia
O'Toole, Simon J. Australia Australia
Obreschkow, Danail Australia Australia
Owers, Matthew S Australia Australia
Oliveira, Alexandre S. Brazil Brazil
Ogando, Ricardo Lourenço Correia Brazil Brazil
Ortiz, Roberto Brazil Brazil
Ovcharov, Evgeni Petev Bulgaria Bulgaria
O'Dea, Christopher P. Canada Canada
Ouellette, Nathalie Nguyen-Quoc Canada Canada
Otarola, Angel Chile United States
Ohnaka, Keiichi Chile Chile
Otten, Gilles P.P.L. (Junior Member) China, Taipei France
Ohashi, Nagayoshi China, Taipei United States
Olsen, Erik H. Denmark Denmark
Olsen, Hans Jørn Fogh Denmark Denmark
Owis, Ashraf H Egypt Egypt
Osman, Anas Mohamed Egypt Egypt
Oja, Heikki Finland Finland
Omont, Alain France France
Ochsenbein, François France France
Ocvirk, Pierre France France
Osmanov, Zaza Georgia Georgia
Oldengott, Isabel Mira (Junior Member) Germany Germany
Oskinova, Lidia M. Germany Germany
Ossendrijver, Mathieu Germany Germany
Ortiz Leon, Gisela Noemi (Junior Member) Germany Germany
Otto, Katharina A. (Junior Member) Germany Germany
Oberst, Jürgen Germany Germany
Olah, Katalin Ilona Hungary Hungary
Omar, Amitesh India India
Ojha, Devendra Kumar India India
Oberoi, Divya India India
Ó Fionnagáin, Dúalta (Junior Member) Ireland Ireland
O'Sullivan, Créidhe Ireland Ireland
O'Sullivan, Stephen Ireland Ireland
Ofir, Aviv Israel Germany
Ofek, Eran Oded Israel Israel
Ortolani, Sergio Italy Italy
Ostorero, Luisa Italy Italy
Orio, Marina Italy Italy
Orienti, Monica Italy Italy
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