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Annual Meeting Registration Open

Join us at the Oregon Museum of Science and Industry on November 1-2.

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

Call for Abstracts

Interested in giving an in-person or remote oral presentation?

https://www.aavso.org/114/abstracts

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/

Webinar | SIGs in the Spotlight

Learn about Eclipsing Binaries, Instrumentation & Equipment, and Short Period Pulsating Variables. | July 12 @ 2:00pm ET on Zoom.

https://us02web.zoom.us/webinar/register/8317483691879/WN_Jm_SQh1lSwi18lbC9Ht1og

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

Last Observation Received:

6 min 17 sec ago by BFO - Janos Bakos (HU)

R CAS Mar 12.8 7.6Vis.

Plot R CAS light curve

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

JAAVSO Volume 53 Number 1, 2025 is published

Jun 15

WebObs 2.0: A New Photometric Data Submission Application

May 23

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.