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Alert Notice 667: V386 Ser to be observed with HST

May 20, 2019: Dr. Paula Szkody (University of Washington) has requested AAVSO assistance in monitoring the cataclysmic variable V386 Ser in support of observations scheduled with the Hubble Space Telecope for 2019 May 30 - 2019 June 1 UT.

Alert Notice 666: CRTS J105122.8+672528 observations needed urgently

May 14, 2019: Dr. Mark Kennedy (Jodrell Bank Centre for Astrophysics, University of Manchester) is urgently requesting observations of the potential cataclysmic variable CRTS J105122.8+672528 beginning immediately. This object appears to be in outburst, having brightened to V~16.2 from its minimum magnitude of V~18.5-CV~19.

Solar Bulletin - Volume 75, Number 4

The April Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: https://www.aavso.org/solar-bulletin

The April SID Data report is available here: https://www.aavso.org/sid-database

AAVSO Annual Campaign 2019 – Cultivating the Future

 

Reach for the stars by participating in the AAVSO 2019 Annual Fundraising Campaign! Your generous contribution will support the AAVSO today and nurture the next generation of star gazers. 

Alert Notice 665: R Aqr observations needed urgently

Note: R Aqr is out of its seasonal gap and is increasingly observable. Continued coverage is requested as described below until further notice. - Elizabeth O. Waagen, May 3, 2019

April 19, 2019:  Dr. Lee Anne Willson (Iowa State University) is urgently requesting observations of the symbiotic Mira R Aqr, particularly from our Southern observers.

Solar Bulletin Volume 75, Number 3

The March Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: https://www.aavso.org/solar-bulletin

The March SID Data report is available here: https://www.aavso.org/sid-database

Alert Notice 664: Monitoring recurrent nova U Sco to discover its imminent eruption

April 3, 2019: Dr. Bradley E. Schaefer (Louisiana State University) provides the following information:

"Frequent monitoring is requested of the recurrent nova U Scorpii over the next year or so to discover the upcoming very-fast eruption. The predicted outburst is for the year 2020.0±0.7. The eruption is likely within the next year, but it could well go off tonight.  

"Observers of many types are needed before the next outburst:

Solar Bulletin Volume 75, Number 2

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

https://www.aavso.org/solar-bulletin

The February SID Data report is available here: https://www.aavso.org/sid-database

 

Alert Notice 663: 1SWASP J022916.91-395901.4 being observed with Chandra

March 8, 2019: Further to AAVSO Alert Notice 652, Dr. Koji Mukai (NASA-Greenbelt Space Flight Center) informs us that 1SWASP J022916.91-395901.4, one of the novalike variables in his target list, will be observed with Chandra on 2019 March 11 22:35 UT - 2019 March 12 02:45 UT.

Alert Notice 662: V818 Sco (Sco X-1) multiwavelength campaign

February 20, 2019: Drs. Sara Motta and Jari Kajava (University of Oxford) have requested AAVSO observers' assistance in monitoring the binary X-ray source V818 Sco (Sco X-1) in support of a large multiwavelength observing campaign being carried out from now through 2019 February 24.

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