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
Olofsson, Kjell Sweden Sweden
Olsen, Erik H. Denmark Denmark
Olsen, Hans Jørn Fogh Denmark Denmark
Olsen, Knut A.G. United States United States
Olthof, Henk Netherlands Netherlands
Oluseyi, Hakeem M United States United States
Oman, Kyle A (Junior Member) United Kingdom Netherlands
Omar, Amitesh India India
Omarov, Chingis Kazakhstan Kazakhstan
Omarova, Gulnara Tukenovna Kazakhstan Kazakhstan
Omizzolo, Alessandro Vatican City State Vatican City State
Omont, Alain France France
OMUKAI, Kazuyuki Japan Japan
O'Mullane, William Joseph Spain Spain
ONAKA , Takashi Japan Japan
Onello, Joseph S. United States United States
Onic, Dusan Serbia, Republic of Serbia, Republic of
Onions, Julian (Junior Member) United Kingdom United Kingdom
ONISHI , Toshikazu Japan Japan
Onken, Christopher Alan Australia Australia
OOHARA , Ken-ichi Japan Japan
Oosterloo, Thomas Anne Netherlands Netherlands
OOTSUBO, Takafumi Japan Japan
Oozeer, Nadeem optional South Africa South Africa
Oppenheimer, Rebecca United States United States
Orchiston, Wayne Australia Australia
Orellana, Mariana Argentina Argentina
Orellana, Rosa B. Argentina Argentina
Orford, Keith United Kingdom United Kingdom
Orienti, Monica Italy Italy
Origlia, Livia Italy Italy
Orio, Marina Italy Italy
Orlandini, Mauro Italy Italy
Orlando, Salvatore Italy Italy
Orleanski, Piotr Poland Poland
Ormel, Chris W Netherlands Netherlands
Orosei, Roberto Italy Italy
Orr, Matthew Edward (Junior Member) United States United States
Orru, Emanuela Netherlands Netherlands
Orsatti, Ana María Argentina Argentina
Ortega-Minakata, René A. (Junior Member) Mexico Mexico
Ortiz, Jose L. Spain Spain
Ortiz, Roberto Brazil Brazil
Ortiz-Carbonell, Ada Norway Norway
Ortiz Gil, Amelia Spain Spain
Ortiz Leon, Gisela Noemi (Junior Member) Germany Germany
Ortolani, Sergio Italy Italy
Orton, Glenn S. United States United States
OSAKI, Yoji Japan Japan
Osborn, Wayne United States United States
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