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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.

Read the full story here

ALMA observations of the Sun, our closest star

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

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