WebObs is where you submit your observations to the AAVSO. You can also use this program to view, edit, and download your own observations.  To upload a file of observations, please make sure your file adheres to one of the AAVSO File Format Specifications.

Submit observations individually Upload a file of observations Search for observations (to edit, delete, or view) Download your observations Submit unreduced PEP observations (PEPObs)

La American Association of Variable Star Observers (AAVSO) y la British Astronomical Association Variable Star Section (BAAVSS) tienen el agrado de anunciar que el archivo de observaciones de estrellas variables de la BAAVSS ya está disponible a través del sitio web de AAVSO. Los archivos de la BAAVSS cuentan con más de 2,5 millones de observaciones de estrellas variables realizadas en su mayoría por astrónomos aficionados de todo el mundo durante los pasados 150 años.

In the April 2014 Newsletter we published an article on variable stars with close companion causing problems with their photometry.

In this page we give more information and updated tables so you can be aware of the stars that are causing problems or have caused problems in the past.

We will be updating this information with more stars in the future.
If you find a problem similar to those described in the Newsletter article, please let us know.

Revised 2020 January 10

Jump to Formal policy: Acknowledgement for Using AAVSO Data
Jump to Dear Colleague letter from the Director on using AAVSO data

Digitizing Olin Eggen's Legacy

Quick link: want to get involved? Visit the Eggen Data Project