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CHOICE: Developing a Visual Observing Program

New Year's message from the President

JAAVSO Volume 44 No. 2

John R. Percy editorial

End of year message from the Director

New January Members

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Recent Activity

Variable Star Observations in Database:

32,627,891 and Counting ...
Last Observation Received:

17 min 19 sec ago by PAW - Alan Plummer (AU)

Z CMA   Feb 23.5694   8.0Vis.   

Plot Z CMA 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!


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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.


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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.

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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.

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'Chameleon' Supernova Challenges Notions About How Stars Evolve


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

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