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The AAVSO International Database has over 15.6 million visual, PEP, and CCD observations of variable stars dating back to its founding over 90 years ago. Over 6 thousand observers from all over the world have contributed data for over 6 thousand objects.

This is the largest and highest quality digital database of variable star observations available. All our data go through a strict quality control analysis ("validation"), a procedure that insures the data are as error free as possible.

Short letter from the AAVSO Director to colleagues using AAVSO data.

Please enter the name of the variable star you are looking for. The data format is here.

** Warning: watch out for the Henden Bumps!

NOTE: The VOTable output format option has been temporarily disabled. We are working to restore that functionality and will have it online as soon as possible. Sorry for any inconvenience this may have caused.