Home | aavso

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

old logo

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/

jaavso

The Journal of the AAVSO

Data

Submit and Access Data

Telescope

Tools and Observer Resources

Observing Sections

Observing Sections

/observing-sections

Education

Education

CHOICE Courses, Manuals, Videos

AAVSO In the Press

AAVSO In the 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:

8 7 , 1 4 9 , 7 1 6 and Counting ...

Last Observation Received:

28 min 20 sec ago by SGEA - Geoff Stone (US)

Gaia DR3 5178419670533420032 Oct 28.4394 14.729CV

Plot Gaia DR3 5178419670533420032 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

orange circle with with snake next to the words "The Astropy Project"

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

Black outline of an intricately dressed being with accentuated features

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