Skip to main content


AAVSO File Format Specifications

This Official AAVSO file report format was released on January 15, 2008.

Files of observations uploaded to the AAVSO via the WebObs File Upload tool must be formatted in the Official AAVSO Format. Visit our page on Software that exports to AAVSO format to help format your observations.

Data Access

The AAVSO Data Access portal

Go to Data Download.
Go to WebObs (search observations).
Go to Light Curve Generator.
Go to MyNewsFlash.
Go to Data Usage Guidelines.
Go to Information about AAVSO Data.


AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484