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Welcome to the AAVSO!

New explorers are welcome.
YOU can be an astronomer.

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

AAVSO 2021 Webinars and How-to Hours

/2021-webinars

Please donate!

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

Please donate to our Annual Campaign today!

/strategic-plan-fundraising-campaign

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

/databases

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 , 8 1 0 , 1 3 0 and Counting ...

Last Observation Received:

1 min 3 sec ago by SPP - Philip Sullivan (US)

ER CAS Dec 27.0458 14.445B

Plot ER CAS light curve

Solar Bulletin - Volume 76, Number 12

Jan 18

JAAVSO Vol 48 No 2 print version available

Jan 14

Schedule

Jan 14

Schedule

Jan 14

Sequence Team Homepage

Jan 13

News Archives

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