Announcing the 2024 Fundraising Campaign
Every contribution helps the AAVSO achieve its mission.
Slider Link
https://www.aavso.org/2024-annual-fundraising-campaign
Target Tool Has a New Home
Click Here to Learn More
Slider Link
https://www.aavso.org/target-tool-has-new-home
The European Space Agency wants your help!
.
Slider Link
https://www.esa.int/Enabling_Support/Preparing_for_the_Future/Space_for_Earth/Amateur_astronomers_needed_help_classify_stars_with_Gaia_s_data
La Ciencia del Cielo para Principiantes
Seminarios web de astronomia gratis en espanol
Slider Link
/2023-seminarios-web
Discover the AAVSO
an international community
Slider Link
/welcome
Happy 100th Birthday: M31-V1!
How Edwin Hubble's discovery of the first Cepheid variable in M31 expanded our view of the universe.
Slider Link
/blog/shattering-shapleys-universe
Webinar: HST Observations of AB Aur
Learn how to contribute to AAVSO's AB Aur campaign. Art: NASA, ESA, Joseph Olmsted (STScI)

Slider Link
https://us02web.zoom.us/webinar/register/3016999884842/WN_Vr3GfhiDRMSrQpGyvrzUlA
observe in the city
Register for December's free webinar.
Slider Link
https://us02web.zoom.us/webinar/register/6817001574899/WN_8YGLAey-S8GrcKZnAhg8pw

old logo

The mission of the AAVSO is to enable anyone, anywhere to participate in scientific discovery through variable star astronomy. 

Resources

VSX Logo
(VSX) Variable Star Index
/vsx

Pick a Star

Plot a light curve
jaavso
The Journal of the AAVSO
/apps/jaavso
Data
Submit and Access Data
/databases
Telescope
Tools and Observer Resources
/observers
Observing Sections
Observing Sections
/observing-sections
Education
Education
CHOICE Courses, Manuals, Videos
/education
AAVSO In Press
AAVSO In Press
/press
Membership and Support
Membership and Support
/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 0 , 5 9 0 , 6 4 7 and Counting ...

Last Observation Received:

16 sec ago by VYP - Pieter Vuylsteke (BE)

ZTF J205604.28+320608.3   Nov 28.8603   14.068V

Plot ZTF J205604.28+320608.3 light curve

Alert Notice 843: Photometry of R Mon, UX Ori, CO Ori, RR Tau, and RY Tau needed now in support of spectroscopic campaign
Nov 21
Cleaning Up VSD
Nov 16
Alert Notice 842: AB Aur monitoring requested for HST observations
Nov 15
Alert Notice 841: VY Scl coverage needed now for HST ToO observations
Nov 13
Alert Notice 840: Anticipated primary eclipse of b Per centered on November 28 2023 UT
Nov 10
News Archives

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

Chroma Technology logo: the word chroma goes through a bright rainbow-colored hoop

Black outline of an intricately dressed being with accentuated features

Unistellar

Boyce Astro Logo

Text reads DC-3 Dreams Observatory Operating Systems

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

NSF

NASA Logo