Skip to main content

Support the AAVSO


Annual Meeting 2017 Nashville, TN

register today!!

I, Science:

citizen astronomers revolutionizing astronomy

2017 Annual Campaign

Announcing the Candidates for 2017 AAVSO Council Elections!

Red Dots Pro-Am follow-up

Pick a Star

Type star name then click action.
Recent Activity

Variable Star Observations in Database:

34,219,086 and Counting ...
Last Observation Received:

59 sec ago by BSCC - Steve Boerner (US)

S CEP   Oct 17.1158   8.871TG   

Plot S CEP light curve


Stellar News Feed

Neutron star merger connected to gravitational wave detection! A new era begins...

It was the tiny wobble that shook science. On September 14, 2015, the billion-dollar, multi-decade mega-experiment LIGO (the Laser Interferometer Gravitational-Wave Observatory) felt gravitational waves rippling through Earth.

Read more here.

Observations of red-giant variable stars by Aboriginal Australians

A very interesting manuscript on "Observations of red-giant variable stars by Aboriginal Australians", talking about Betelgeuse (Alpha Orionis), Aldebaran (Alpha Tauri), and Antares (Alpha Scorpii).

Read the manuscript here 

Mysterious Dimming of Tabby's Star May Be Caused by Dust

A new study using NASA's Spitzer and Swift missions, as well as the Belgian AstroLAB IRIS observatory, suggests that the cause of the dimming over long periods is likely an uneven dust cloud moving around the star...

Read more here

Seeing Double: Scientists Find Elusive Giant Black Hole Pairs



Astronomers have identified a bumper crop of dual supermassive black holes in the centers of galaxies. This discovery could help astronomers better understand how giant black holes grow and how they may produce the strongest gravitational wave signals in the universe.

Read more here

Ageing Star Blows Off Smoky Bubble


Astronomers have used ALMA to capture a strikingly beautiful view of a delicate bubble of expelled material around the exotic red star U Antliae. These observations will help astronomers to better understand how stars evolve during the later stages of their life-cycles.

Read more here

AAVSO is an equal opportunity and discrimination/harassment-free environment. Please read our policies here.

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484