O'Brian K.
O'Brien J. C.
O'Byrne John
O'Dougherty Stefan N.
O'Neil Earl J. Jr.
O'Sullivan Stephen
Oba Yasuhiro
Oberg Karin
Obreja A. C.
Occhiogrosso Angela
Ocvirk Pierre
Odaka Hirokazu
Oesch Pascal
of Washington Observatories of the Carnegie Institution
Ogawa Hideo
OGLE the
Oh Kyuseok
Oh Seulhee
Ohlendorf Henrike
Oka Takashi