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Thank you, observers! Over 50 MILLION photometric variable star observations are in our open-source AAVSO International Database (AID)!

https://www.aavso.org/aavso-international-database-aid

Donations help us maintain our open-source databases and free education. Please donate to AAVSO’s Annual Campaign Today!

https://www.aavso.org/110-fundraising-campaign

Interested? Please click here!

/directorsearch

January's featured variable episode: Pleione

Interactive 360 video | Versions for planetariums | Tips for the beginner

/featured-variables

Welcome to the AAVSO!

New explorers are welcome.
YOU can be an astronomer.

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

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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

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Education

Education

CHOICE Courses, Manuals, Videos

AAVSO In Press

AAVSO In 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:

5 0 , 9 2 9 , 5 0 3 and Counting ...

Last Observation Received:

1 hour 5 min ago by SPP - Philip Sullivan (US)

TZ CAS Jan 26.0577 6.070I

Plot TZ CAS light curve

AAVSO 2022 How-to Hour Instructors

Jan 27

AAVSO 2022 How-to Hour Discussions

Jan 27

Solar Bulletin - Volume 77, Number 12

Jan 18

Alert Notice 766: V1204 Tau observations needed now for HST coverage

Jan 14

Alert Notice 765: GP Com HST schedule moved forward

Jan 13

Our Stellar Partners

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