The AAVSO is an international non-profit organization of variable star observers whose mission is to observe and analyze variable stars, to collect and archive observations for worldwide access, to forge strong collaborations between amateur and professional astronomers, and to promote scientific research and education using variable star data. The American Assocaition of Variable Star Observers (AAVSO) is a non-profit worldwide scientific and educational organization of amateur and professional astronomers who are interested in stars that change in brightness, variable stars.