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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

February's variable star and observing guide

Explore PROPUS of GEMINI with us! Monthly episodes include a video, finder chart, observing tips for the beginner.

A collaboration of the AAVSO, Ball State University, and the International Planetarium Society

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

/education

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 4 , 1 9 7 , 5 9 8 and Counting ...

Last Observation Received:

1 hour 46 min ago by PLA - Antonio Padilla Filho (BR)

R Hor Mar 3.9618 5.9Vis.

Plot R Hor light curve

Alert Notice 732: Observations requested for eclipsing binary ASASSN-21co

Mar 2

LPV of the Month, March 2021: R Lyncis

Feb 26

Alert Notice 731: Monitoring needed for TW Hya for HST and TESS observations

Feb 24

Alert Notice 730: Spectroscopy and photometry requested for SS Cyg

Feb 17

Solar Bulletin - Volume 77, Number 01

Feb 16

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