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Discover the AAVSO

An international community

/welcome

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/

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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

/index.php/vsx

The Journal of the AAVSO

/index.php/apps/jaavso

Submit and Access Data

/index.php/databases

Tools and Observer Resources

/index.php/observers

Observing Sections

/index.php/observing-sections

Education

CHOICE Courses, Manuals, Videos

/index.php/education

AAVSO In the Press

/index.php/press

Membership and Support

/index.php/join-aavso

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:

6 5 , 4 7 1 , 5 8 1 and Counting ...

Last Observation Received:

36 sec ago by SASC - Andrey Semenyuta (KZ)

R Leo May 5.7083 5.73Vis.

Plot R Leo light curve

RW Cephei, a King of Kings

Dec 11

Board Election Results

Nov 19

Director's Report - 2024-Q3

Oct 23

Clinton B. Ford Observatory Destroyed by Fire

Oct 7

What to Do During the Eruption of T CrB

Sep 17

News Archives

Our Stellar Partners

$Diffraction Limited logo of a swirled circle with text: Diffraction: Astronomy + Scientific Imaging SolutionsIm$

Announcement: New Forums

Resources

Pick a Star

AAVSO at a Glance

Variable Star Observations in Database:

Last Observation Received:

Our Stellar Partners