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Solar Eclipse - August 21, 2017

AAVSO Annual Report

for 2015 - 2016 now online

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Recent Activity

Variable Star Observations in Database:

32,799,165 and Counting ...
Last Observation Received:

1 min 59 sec ago by RJG - Jose Ribeiro (PT)

HQ CMA   Mar 29.9271   6.4Vis.   

Plot HQ CMA light curve


Stellar News Feed

Search for stellar survivor of a supernova explosion

Astronomers have used the NASA/ESA Hubble Space Telescope to observe the remnant of a supernova explosion in the Large Magellanic Cloud. Beyond just delivering a beautiful image, Hubble may well have traced the surviving remains of the exploded star’s companion.

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Black hole winds form new stars!

Observations using ESO’s Very Large Telescope have revealed stars forming within powerful outflows of material blasted out from supermassive black holes at the cores of galaxies. These are the first confirmed observations of stars forming in this kind of extreme environment.

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The Secret (X-Ray) Lives of Cepheids: The Surprising Discovery of a New Class of Pulsating X-Ray Stars

Data recently returned for d Cep from the Chandra X-ray Observatory, combined with previous X-ray measures secured with the XMM-Newton X-ray satellite, have shown that d Cep has X-ray variations occurring in accord with the supergiant star's 5.4 day pulsation period. X-rays are observed at all phases of the star’s pulsations, but sharply rise by ~400% near the times when the star swells to its maximum diameter of about 45 times that of the Sun.

New types of variable stars from the Kepler satellite.


Twenty-three new objects have been added to the growing collection of stars observed to have unusual dips in their light curves. A recent study examines these stars and the potential causes of their strange behavior.

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Star Discovered in Closest Known Orbit Around Likely Black Hole

Astronomers have found evidence for a star that whips around a black hole about twice an hour. This may be the tightest orbital dance ever witnessed for a likely black hole and a companion star.

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