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Starspots & Transiting Exoplanets

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

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

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

Blazed and Confused

Earlier predictions of T CrB's explosion have passed—will 2025 be the year the “Blaze Star” erupts?

https://www.aavso.org/blog/tcrb-blazed-and-confused

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 , 9 9 1 , 4 3 6 and Counting ...

Last Observation Received:

2 hours 6 min ago by AJV - Javier Alonso (ES)

ry uma Mar 21.8333 7.4Vis.

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

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