Skip to main content

Support the AAVSO

Become a Member

Donate by Credit Card

Donate with PayPal

Adopt a Variable Star

Donate when you
Shop at

Introducing our new AAVSO staff Astronomer

New February Members

Welcome to the AAVSO family!

Learning Opportunities from the AAVSO

AAVSO Annual Report

for 2015 - 2016 now online

AAVSO transform campaign – participate and win $500

Pick a Star

Type star name then click action.
Recent Activity

Variable Star Observations in Database:

32,756,051 and Counting ...
Last Observation Received:

41 min 26 sec ago by AGUA - Guillermo Abramson (AR)

SN 2017cbv   Mar 22.0889   11.5Vis.   

Plot SN 2017cbv light curve


Stellar News Feed

New types of variable stars from the Kepler satellite.


Twenty-three new objects have been added to the growing collection of stars observed to have unusual dips in their light curves. A recent study examines these stars and the potential causes of their strange behavior.

Read full story here

Star Discovered in Closest Known Orbit Around Likely Black Hole

Astronomers have found evidence for a star that whips around a black hole about twice an hour. This may be the tightest orbital dance ever witnessed for a likely black hole and a companion star.

Read full story here

SN2015bh: the end of a star or an "impostor" supernova?

Astronomers spot an intense explosion of a massive star, which, according to records, experienced frequent eruptions for at least 20 years. The analysis of the outburst does not allow to discern between a real supernova - an explosive event marks the end of a star - or a giant eruption implying a massive change in the star’s evolutionary course

Read full story here

Iota Orionis: pulsating beacon of a constellation

Using the world's smallest astronomical satellites, researchers detect the biggest stellar heartbeat ever...

Read full story here

Ultracool Dwarf and the Seven Planets

From the exoplanet community: 7 Earth-sized planets discovered around the star Trappist-1, only 39 light-years away. 3 of those planets are inside the star's habitable zone!


Read full story 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