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New explorers are welcome.
YOU can be an astronomer.

https://www.youtube.com/watch?v=tgCB2lBRk8s&t=5s

AAVSO 2021 online events

Sign up for any to all of these webinars and how-to hours!

Sponsorship opportunities for this year-long series are available!

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Please donate!

We have new goals to help you & the scientific community!

Please donate to our Annual Campaign today!

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New for you: monthly variable star episodes!

Each variable star and corresponding episode, complete with observing tips for the beginner who has never found a star or calculated its brightness, is brought to you by a collaboration of the AAVSO, Charles W. Brown Planetarium at Ball State University, and the International Planetarium Society.

Check out this month's star to observe!

https://www.aavso.org/featured-variables

The mission of the AAVSO is to enable anyone, anywhere to participate in scientific discovery through variable star astronomy.

Resources

(VSX) Variable Star Index

/vsx

The Journal of the AAVSO

/apps/jaavso

Submit and Access Data

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Tools and Observer Resources

/observers

Observing Sections

/observing-sections

Education

CHOICE Courses, Manuals, Videos

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Shop

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Join and Support

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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:

4 3 , 7 7 1 , 2 2 7 and Counting ...

Last Observation Received:

7 min 44 sec ago by LGIB - Gianpiero Locatelli (IT)

S2 0109+224 Jan 18.878 13.864V

Plot S2 0109+224 light curve

Solar Bulletin - Volume 76, Number 12

Jan 18

JAAVSO Vol 48 No 2 print version available

Jan 14

Jan 14

Jan 14

Jan 14

Our Stellar Partners

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Resources

Pick a Star

AAVSO at a Glance

Variable Star Observations in Database:

Last Observation Received:

Our Stellar Partners