Skip to main content

Support the AAVSO

Adopt a Variable Star 

Use this link when you
Shop at 
5% of your order price goes to the AAVSO, at no additional cost to you!

End of year message from the Director

New January Members

Welcome to the AAVSO family!

JAAVSO Volume 44 No. 2

John R. Percy editorial

New Year's message from the President

CHOICE: Developing a Visual Observing Program

Pick a Star

Type star name then click action.
Recent Activity

Variable Star Observations in Database:

32,642,369 and Counting ...
Last Observation Received:

24 sec ago by ONJ - John O'Neill (US)

Z UMA   Feb 26.9507   7.8Vis.   

Plot Z UMA light curve


Stellar News Feed

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

The brightest, furthest pulsar in the universe!


ESA's XMM-Newton has found a pulsar – the spinning remains of a once-massive star – that is a thousand times brighter than previously thought possible.


Read full story here

Planet-induced stellar pulsations? "A star pulsing in response to its orbiting planet".

NASA's Spitzer Space Telescope has detected unusual pulsations in the outer shell of a star called HAT-P-2. Scientists' best guess is that a closely orbiting planet, called HAT-P-2b, causes these vibrations each time it gets close to the star in its orbit.

Read full story here

Witnessing a Quasar turning on!

The intermediate Palomar Transient Factory (iPTF) has discovered a quasar — the brightly-shining, active nucleus of a galaxy — abruptly turning on in what appears to be the fastest such transition ever seen in such an object.

Read full story here

'Chameleon' Supernova Challenges Notions About How Stars Evolve


A perplexing "chameleon supernova" is challenging the way astronomers study massive star explosions.

Read the 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