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: 14106 (of which 719 Junior members). Number of Active Individual and Junior Members in the IAU Directory: 11606.


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Name▼ Location NCA adherence
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
Orlitová, Ivana Czech Republic Czech Republic
Ormel, Chris W Netherlands Netherlands
Orosei, Roberto Italy Italy
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
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
Oskinova, Lidia M. Germany Germany
Oslowski, Stefan Australia Australia
Osmer, Patrick S. United States United States
Osório, Isabel Maria T.V.P. Portugal Portugal
Osório, José Pereira Portugal Portugal
Osorio, Mayra Spain Spain
Ossendrijver, Mathieu Germany Germany
Osten, Rachel A. United States United States
Østensen, Roy H. Norway Norway
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