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Webinar | Starspots & Transiting Exoplanets

Join Dr. William Waalkes on April 5 to learn the challenges of understanding planets transiting spotted stars.

https://us02web.zoom.us/webinar/register/9017393997787/WN_4gs0OjDkQ66qH9bDyu8gEg

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

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The Journal of the AAVSO

Data

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Tools and Observer Resources

Observing Sections

Observing Sections

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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 , 6 0 7 , 6 6 0 and Counting ...

Last Observation Received:

35 min 51 sec ago by TRE - Ray Tomlin (US)

NSV 7378 Mar 17.4388 8.786I

Plot NSV 7378 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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