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Webinar | Meet the Candidates

Join us as we hear from each of the candidates running in the AAVSO's FY26 Board election. | October 4 @ 2:00pm ET on Zoom.

https://us02web.zoom.us/webinar/register/1217574098520/WN_dUnFAl5aRD2mT63JrSiwYA

AAVSO 114th Annual Meeting

The agenda is currently under development—check often for updates!

https://www.aavso.org/114

They Might Be Hypergiants

AAVSO data has helped unveil the mysteries of Rho Cas and stars like it.

https://www.aavso.org/blog/they-might-be-hypergiants

A Universe of Opportunity: The Future of Small Telescope Science in the LSST Era

Each time a major sky survey comes online, the inevitable question arises: “Is this the end of amateur astronomy?”

https://www.aavso.org/blog/future-of-small-telescope-science

Discover the AAVSO

An international community

Welcome to the conversation.

We are excited to announce a transition to a new forum system. The new system is modern, faster, and easier-to-use.

https://forums.aavso.org/

Call for Nominations

Submit your recommendations for recipients of the Merit Award and the William Tyler Olcott Distinguished Service Award.

https://docs.google.com/forms/d/e/1FAIpQLSdF6dmZGDOzE5nzlhjMqOn5DCoYrinW-bIp8gnB1jcaosJe_A/viewform?usp=header

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The mission of the AAVSO is to enable anyone, anywhere to participate in scientific discovery through variable star astronomy.

Resources

(VSX) Variable Star Index

jaavso

The Journal of the AAVSO

Data

Submit and Access Data

Telescope

Tools and Observer Resources

Observing Sections

Observing Sections

/observing-sections

Education

Education

CHOICE Courses, Manuals, Videos

AAVSO In the Press

AAVSO In the Press

Membership and Support

The AAVSO is an equal opportunity and discrimination / harassment free environment.
Please read our policies HERE

AAVSO at a Glance

Variable Star Observations in Database:

7 3 , 0 0 5 , 8 6 3 and Counting ...

Last Observation Received:

1 min 22 sec ago by MMH - Marek Muciek (PL)

df cyg Sep 20.8396 11.9Vis.

Plot df cyg light curve

Voting and Candidates for the 2025 AAVSO Board Election

Sep 18

An Invitation to Board Nominees

Aug 5

JAAVSO Volume 53, Number 1, June 2025, print version now available

Jul 2

A Universe of Opportunity: The Future of Small Telescope Science in the LSST Era

Jul 1

Jun 25

Our Stellar Partners

orange circle with with snake next to the words "The Astropy Project"

$Diffraction Limited logo of a swirled circle with text: Diffraction: Astronomy + Scientific Imaging SolutionsIm$

Black outline of an intricately dressed being with accentuated features

Text reads "Sky & Telescope" with the ampersand in a circle.