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Introducing the SID Data Grabber

Thanks to a great volunteer effort by George Silvis, Sudden Ionospheric Disturbance (SID) observers can now use the SID Data Grabber help prepare an AAVSO SID report file from their Stanford/SARA superSID monitor log files. Please visit the SID Data Grabber page to read more and download this handy application.

New JAAVSO preprint: Recent minima of 149 EB stars



Recent Minima of 149 Eclipsing Binary Stars

Gerard Samolyk


New JAAVSO preprint: Video Technique for Observing EB stars



Video Technique for Observing Eclipsing Binary Stars

Hristo Pavlov, Anthony Mallama


New JAAVSO preprint: Sudden period change and dimming of V752 Cen



Sudden Period Change and Dimming of the Eclipsing Binary V752 Centauri

Anthony Mallama, Hristo Pavlov


AAVSO Newsletter for April 2015 is published

AAVSO Newsletter 64, April 2015 is now available to members

The AAVSO Newsletter is a periodic, general forum that supports our various observing programs with lists of new targets, observing programming ideas, and general information that spans a wide area of interest. Guest writers contribute pieces that can range from current events to book reviews.

Annual Report for 2013-2014 is now online

Annual Report of the AAVSO for 2013-2014

Special Notice #403: GW Lib HST schedule set

April 16, 2015: Further to AAVSO Alert Notice 513, Dr. Paula Szkody (University of Washington) informs us that the HST observations for the cataclysmic variable GW Lib have been scheduled for

2015 April 22 04:04:36 - 09:00:06 UT.

Solar Bulletin - Volume 71, Number 3

The March Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy:

The March SID Data report is available here:

Alert Notice 518: Observations of 2MASS J06593158-0405277 needed

April 15, 2015: Dr. Fabienne A. Bastien (Hubble Postdoctoral Fellow, Pennsylvania State University) has requested AAVSO assistance in monitoring the rare FU Ori object 2MASS J06593158-0405277 as part of a campaign to observe this T Tauri star from the optical to the infrared in the coming weeks.  

Special Notice #402: RW Aur more intense monitoring needed now

April 13, 2015: Further to AAVSO Alert Notice 514, the Chandra observations of the classical T Tauri star RW Aur (component A) have been scheduled and will take place

2015 April 16 6:30 - 17:37 UT


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