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Register for the 2023 Annual Meeting

Target Tool Has a New Home

Click Here to Learn More

https://www.aavso.org/target-tool-has-new-home

The European Space Agency wants your help!

https://www.esa.int/Enabling_Support/Preparing_for_the_Future/Space_for_Earth/Amateur_astronomers_needed_help_classify_stars_with_Gaia_s_data

La Ciencia del Cielo para Principiantes

Seminarios web de astronomia gratis en espanol

/2023-seminarios-web

Discover the AAVSO

an international community

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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 9 , 4 5 7 , 8 4 5 and Counting ...

Last Observation Received:

4 min 21 sec ago by MPTA - Pteancu Mircea (RO)

Bet Per Sep 28.8181 2.3Vis.

Plot Bet Per light curve

112th Annual Meeting Group Hotel Rate ends in 9 days- book today!

Sep 27

Alert Notice 833: LL Lyr to be observed with HST in September/October

Sep 20

Alert Notice 832: Monitoring of FO Aqr needed for HST observations

Sep 19

Early Bird Registration for the Annual Meeting ends this Friday, 9/15!!!

Sep 13

Abstracts due in 1 week for 2023 Annual Meeting Talks!!

Aug 28

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.