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CHOICE: Developing a Visual Observing Program

JAAVSO Volume 44 No. 2

John R. Percy editorial

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Recent Activity

Variable Star Observations in Database:

32,609,244 and Counting ...
Last Observation Received:

27 min 29 sec ago by DPHA - Philippe Danthine (BE)

BU GEM   Feb 18.8840   6.0Vis.   

Plot BU GEM 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.

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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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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.

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ALMA observations of the Sun, our closest star

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

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