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AAVSO Observations Help Confirm Betelgeuse's Long-Suspected Companion

After more than a century of searching, astronomers have confirmed Betelgeuse's elusive companion star, and AAVSO observations played a critical role in the discovery. Learn how years of dedicated monitoring helped solve one of astronomy's longest-standing mysteries.

https://www.aavso.org/blog/aavso-observations-help-confirm-betelgeuses-long-suspected-companion

A New AAVSO Website

/blog/new-aavso-website-coming.

115th Annual Meeting Registration is Now Open

Join us in Santa Fe, NM Nov. 7th and 8th

Building for the Future: AAVSO Expands Staff and Scientific Capacity

Building on recent growth in observers, scientific output, and community engagement, the AAVSO is making strategic investments to strengthen its future and expand opportunities for participation in astronomy.

https://www.aavso.org/blog/building-for-the-future

Discover the AAVSO

An international community

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The vision of the AAVSO is to become the leading platform where people of all ages and backgrounds learn about and participate in scientific astronomy.

Resources

(VSX) Variable Star Index

https://vsx.aavso.org/

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The Journal of the AAVSO

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AAVSO In the Press

AAVSO In the Press

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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:

8 7 , 0 7 1 , 8 4 1 and Counting ...

Last Observation Received:

1 min 57 sec ago by DGOB - Goran Drascic (HR)

del Cep Sep 30.7591 3.783TG

Plot del Cep light curve

A New AAVSO Website is Coming

Aug 3

AAVSO Observations Help Confirm Betelgeuse's Long-Suspected Companion

Jul 28

JAAVSO Volume 54, Number 1, June 2026, print version now available

Jul 9

Director’s Report - 2026-Q1/Q2

Jul 8

JAAVSO Volume 54, Number 1, 2026 is published

Jun 15

Our Stellar Partners

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Text reads "Sky & Telescope" with the ampersand in a circle.