On Feburary 19, 2011 the number of observations in the AAVSO International Database surpassed the 20 million mark. It is fitting that this milestone was achieved during our 100th anniversary. Below is some information about the achievement.
The AAVSO International Database has over 28 million variable star observations going back over one hundred years. It is the largest and most comprehensive digital variable star database in the world. Over 1,000,000 new variable star brightness measurements are added to the database every year by over 700 observers from all over the world.
Welcome to the AAVSO's Research Portal. From this page, you can find information about obtaining AAVSO data, requesting new observations, or learning more about the AAVSO, its data, and its services for the research community. Its purpose is to facilitate your use of the AAVSO's resources in your research efforts.
See the blue boxes on the right hand side of this page to access the AAVSO data archives or to find out how to work with the AAVSO to obtain new scientific data.