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JAAVSO Volume 44 No. 2

John R. Percy editorial

End of year message from the Director

New January Members

Welcome to the AAVSO family!

CHOICE: Developing a Visual Observing Program

New Year's message from the President

Pick a Star

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Recent Activity
 
 

Variable Star Observations in Database:

32,609,498 and Counting ...
Last Observation Received:

34 min ago by SFS - Stephen Schiff (US)

SS AUR   Feb 20.1240   <13.9Vis.   

Plot SS AUR light curve

 
 

Stellar News Feed

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

Dwarf-Star Wars: the revenge of the degenerates

AR Sco - the unique white dwarf-M dwarf binary discovered by non-professional astronomers - in the news again, with new data from the South African Astronomical Observatory.

Read the full story here

ALMA observations of the Sun, our closest star

New images of large sunspots in radio wavelengths (ALMA).

Read the full story here

 

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