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Webinar | SIGs in the Spotlight

Attend to learn about exoplanets, solar observing & YSOs. | June 7 @ 2:00pm ET on Zoom.

https://us02web.zoom.us/webinar/register/6117452724173/WN_llJHm6zkT1a1wpK0WLjBCg

Announcing: AAVSO Annual Meeting in Portland Oregon

Our Annual Meeting will be held November 1-2 at the Oregon Museum of Science & Industry.

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

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/

Director’s Report | 2025 Q1

Updates on the Annual Meeting, website relaunch, strategic plan, financial overview, and more.

https://www.aavso.org/blog/directors-report-2025-q1

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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:

6 9 , 0 0 7 , 5 8 4 and Counting ...

Last Observation Received:

4 min 13 sec ago by KREA - Remco Kemperman (NL)

IO CVN Apr 1.9891 15.221I

Plot IO CVN light curve

Director’s Report for 2025-Q1

May 5

They Might Be Hypergiants

May 1

New Data Search and Submit Applications

Mar 6

Blazed and Confused

Feb 24

Director's Report for 2024-Q4

Feb 13

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.