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They Might Be Hypergiants

AAVSO data has helped unveil the mysteries of Rho Cas and stars like it.

https://www.aavso.org/blog/they-might-be-hypergiants

A Universe of Opportunity: The Future of Small Telescope Science in the LSST Era

Each time a major sky survey comes online, the inevitable question arises: “Is this the end of amateur astronomy?”

https://www.aavso.org/blog/future-of-small-telescope-science

Discover the AAVSO

An international community

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 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 2 , 6 5 3 , 9 4 9 and Counting ...

Last Observation Received:

12 sec ago by HDR - Dieter Husar (DE)

V2254 Oph May 11.0605 16.27CV

Plot V2254 Oph light curve

A wonderful visual discovery - Stubbings V1

Feb 23

Steven Silverberg

Feb 20

Director’s Report - 2025-Q3/Q4

Jan 5

JAAVSO Volume 53, Number 2, December 2025, print version now available

Dec 17

JAAVSO Volume 53 Number 2, 2025 is published

Dec 15

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.