Python! Finding Frequency Solutions for Variable Star Light Curves
Register for this Saturday's webinar!
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Book your room at the group rate before the October 4th deadline!
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New Executive Director
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Discover the AAVSO
an international community
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Observe Delta Cephei in September!
360-degree video | Tips for beginners
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The mission of the AAVSO is to enable anyone, anywhere to participate in scientific discovery through variable star astronomy. 

Resources

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The AAVSO is an equal opportunity and discrimination / harassment free environment. 
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AAVSO at a Glance

Variable Star Observations in Database:

5 4 , 2 9 9 , 4 6 8 and Counting ...

Last Observation Received:

14 sec ago by APAA - Patrick Ashmore (CA)

CL CYG   Sep 24.1941   10.120I

Plot CL CYG light curve

Alert Notice 792: R Aqr photometry and spectroscopy requested in support of Chandra observations
Sep 21
Solar Bulletin - Volume 78, Number 8
Sep 16
Don't miss the 111th Annual Meeting and Exoplanet Workshop!
Sep 15
AAVSO Selects Dr. Brian Kloppenborg as Executive Director
Sep 13
Alert Notice 791: Anticipated secondary eclipse of b Per centered on September 29 2022 UT
Sep 9
News Archives

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