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Thank you for your support!

Your generous donations helped us reach—and exceed—our Annual Campaign goal.

https://www.aavso.org/donate-now?utm_source=slider&utm_medium=web&utm_campaign=ac25

Deciphering Eclipsing Binary Systems

Join Dr. Pierre Maxted for a presentation on ESA’s PLATO mission to study terrestrial exoplanets.

https://us02web.zoom.us/webinar/register/8817374773923/WN__1iX3a3URi-ry9MneK7lfw

RW Cephei, King of Kings

The physical processes behind a hypergiant’s “great dimming” may have been unlocked by high-resolution imagery and a century’s worth of AAVSO observations

https://www.aavso.org/blog/rw-cephei

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/

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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 7 , 2 4 5 , 6 1 0 and Counting ...

Last Observation Received:

19 min 19 sec ago by TRE - Ray Tomlin (US)

KO CNC Mar 10.2144 9.961I

Plot KO CNC light curve

New Data Search and Submit Applications

Mar 6

Blazed and Confused

Feb 24

Director's Report for 2024-Q4

Feb 13

The Tesla Roadster—Not an Asteroid

Feb 8

Solar Section Looks Back to the Future

Dec 23

Our Stellar Partners

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