International nonprofit organization and world leader in variable star research, with a mission to enable anyone to participate in scientific discovery.

Joined January 2010
384 Photos and videos
28 Nov 2025
While most stars are too far away for us to “see” what is going on at or around their surfaces, time domain studies provide access to these close-in regions. Register for our Dec. 13 webinar to learn more! linkly.link/2RkSV
3
192
12 Nov 2025
Like the sound of grabbing unlimited data with 24-inch remote scopes? Does recurrent novae make your heart flutter? Is collecting and analyzing stellar spectra your bag? Register for our Nov. 15 webinar to hear leaders of our Special Interest Groups! | linkly.link/2KlLZ
1
225
1 Nov 2025
The 114th Annual Meeting is live! In-person and remote attendees have been welcomed, and the live stream continues with our first keynote, “The NASA Landolt Mission,” by Dr. Peter Plavchan.
2
222
31 Oct 2025
The Annual Meeting of the AAVSO kicks off tomorrow. Even if you are not attending, you can support us by participating in our silent auction. Every dollar raised will help underwrite the AAVSO’s programs and services. Bidding ends Sunday at 19:30 PST. linkly.link/2I6aa
1
1
229
30 Sep 2025
Join us this Saturday as we hear from each of the candidates running in the AAVSO’s FY26 Board election. Each candidate will discuss their own background, running platform, and thoughts on the future of the AAVSO. linkly.link/2FkSB
1
215
27 Aug 2025
TESS Follow-Up Observing Program (TFOP) In our next webinar, Dr. Karen Collins will provide an overview of the TFOP program, demonstrate the tools made available to coordinate and analyze observations, and explain how to apply to join the fun. linkly.link/2EGrr
1
5
445
30 Jul 2025
Description Betelgeuse continues to challenge us: a Great Dimming, and perhaps a companion hidden within its atmosphere. Dr. Andrea Dupree relates the history, puzzling behavior, and contributions of the AAVSO as well as ongoing studies. linkly.link/2CFE1
4
293
9 Jul 2025
Enjoy observing variables due to stellar alignments or pulsations? Like learning about hardware used to observe the night sky? Register for Saturday’s webinar to learn about the Eclipsing Binaries, SPP Objects, and Instrumentation & Equipment sections. linkly.link/2BR80
3
255
28 May 2025
Our Observing Sections are now Special Interest Groups. On June 7, learn about three SIGs—Exoplanets, Solar Observing, and Young Stellar Objects—by attending our webinar. Enjoy exoplanets or probing protostars? Curious about sunspots? Register below! 2ly.link/27gIT
1
5
348
21 Apr 2025
Our next webinar host is Dr. Rob Zellem. Register to learn about NASA’s Pandora SmallSat mission. The mission will monitor transiting exoplanets and their host stars to disentangle stellar activity from the planet’s atmospheric signal. | bit.ly/3GfMOVL
2
285
28 Feb 2025
And . . . we’re back. Join Dr. Pierre Maxted as he describes the on-going effort by the PLATO stellar science team to calibrate the next generation of stellar models using observations of well-studied “benchmark” stars. bit.ly/4ilLTR4
2
2
364
20 Apr 2023
Register by May 1: The 5th European Variable Star Observer meeting (EVS-5) is May 27 & 28 in Barcelona, Spain, to promote Pro-Am and inter-organization collaborations. For more information or to register, please visit rr-lyr.irap.omp.eu/photometr…
1
1
14
2,006
18 Apr 2023
Visit idsw.darksky.org/ to learn more or join in the movement! @IDADarkSky #DarkSkyWeek #DiscovertheNight
2
6
1,325
5 Apr 2023
As we kick off our annual campaign, first, THANK YOU for your past support! This year’s campaign will help us hire a software developer, improve the quality of our data, and find our niche within the automated sky survey era. Please consider donating! aavso.org/2023-fundraising-c…
1
4
1,041
4 Apr 2023
Check out our Annual Impact Report of activities and accomplishments that took place within the last fiscal year (Oct. 1st - Sept. 30th)! THANK YOU to all the donors, sponsors, observers, members, and program participants who have supported the AAVSO! aavso.org/annual-report
2
13
1,544
Images were collected using Robotic telescopes with apertures upto 1m on Ground @faulkestel @iTelescope_Net @smubgobs @AAVSO and in Space. #NEOSSat @csa_asc. Proposals were written to get telescope time. Almost 50 hours of observations of #Didymos were collected. #LPSC2023 (4/20)
2
4
7
1,448
31 Mar 2023
Get learning! AAVSOnet: a global network of remote telescopes any AAVSO member can propose to use! Wondering if AAVSOnet is for you, & you're not a member? Webinar instructors are AAVSOnet users & could help you know if joining AAVSO is the next move! us02web.zoom.us/webinar/regi…
2
4
717
8 Mar 2023
Happy International Women's Day! Our AAVSO Ambassador Program is filled with bright, driven, and skilled astronomers! Check out an entirely women-created Ambassador video on their scientific contributions, astronomy passions, and how you can get involved! youtube.com/watch?v=NcpsKLxA…
1
3
490
3 Mar 2023
Our free upcoming webinar is a panel discussion on How to Automate Your Rig! Perfect for you if you're looking to stop being a night owl minding your telescope, and begin being able to sleep while collecting data. Find out who's on the panel and sign up: us02web.zoom.us/webinar/regi…
3
12
897
24 Feb 2023
⏰ 🤩💫 Happy Julian Day 2,460,000! 🌟✨
6
17
1,830