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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.

Solar Bulletin - Volume 75, Number 1

The  January 2019 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: https://www.aavso.org/solar-bulletin

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

Annual Report for 2017-2018 online

The AAVSO Annual Report for 2017-2018 has been published and is online. Both a high-resolution and a low-resolution version are available at https://www.aavso.org/annual-report.

Alert Notice 661: Correction to AAVSO Alert Notice 659 on KQ Mon

January 28, 2019: AAVSO Alert Notice 659 announced that the nova-like variable KQ Mon will be observed with Chandra on 2019 January 29-30 UT. The exact time interval given was incorrect.

KQ Mon will be observed with Chandra on

2019 January 29 20:18 UT - January 30 00:28 UT.

A snapshot every one to two nights is requested between now and February 9. V filter is optimal. Visual observations are welcome. The visual range of KQ Mon is 12.5-13.7.

Alert Notice 660: Targets modified for LPV Maser campaign

January 25, 2019: Further to AAVSO Alert Notice 645, Michael Stroh (Ph.D. candidate, University of New Mexico) informs us that two of the VLA targets on his list of 19 long period variables for his SiO maser study that is underway have been removed and two other targets added.

The stars removed from the campaign are V1301 Cyg and V1659 Cyg. The stars taking their places are V657 Cas and V850 Cas. Below is a revised list of the targets for this campaign.

Alert Notice 659: KQ Mon being observed with Chandra

Note: The time of the Chandra observation was incorrect in the original version of this Alert Notice. The text below has been edited so that the time is correct. This correction was announced in AAVSO Alert Notice 661. - Elizabeth Waagen

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