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Solar Bulletin - Volume 73, Number 07

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

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

Alert Notice 592: V404 Cyg observations needed tonight for Chandra observations

August 11, 2017: Dr. Gregory Sivakoff (University of Alberta) and colleagues have requested AAVSO observers' assistance in observing the black hole X-ray transient LMXB V404 Cyg in support of Chandra observations taking place TONIGHT. The Chandra schedule is

2017 Aug 11 23:49:04.072  - 2017 Aug 12 13:42:14.730 UTC

Alert Notice 591: GW Lib observations requested in support of K2 and HST observations

August 7, 2017: Dr. Boris Gaensicke (Warwick University) has requested our help in monitoring the pulsating white dwarf-containing cataclysmic variable GW Lib in preparation for and support of K2 (Kepler's Second Light) and Hubble Space Telescope (HST) observations scheduled for August to November 2017 and August and September 2017, respectively.

K2 will be observing GW Lib non-stop 2017 Aug 23 20:00:00 to 2017 Nov 19 23:00:00 UTC.

Alert Notice 590: V1117 Her observations requested

August 7, 2017: AAVSO Young Stellar Object (YSO) Section leader Michael Poxon (Great Plumstead, Norfolk, UK) requests coverage of the YSO V1117 Her.

He writes: "The peculiar YSO V1117 Herculis has undergone a second, rapid fade and recovery only a few days after its recovery from another rapid fade. Observations, both visual and multiwavelength, are encouraged, since the behaviour of this star's historical fading episodes may indicate rapidly-changing evolution of the protoplanetary clumps in the circumstellar disc.

Alert Notice 589: R Aqr coverage needed for HST and Chandra observations

August 4, 2017: Dr. Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) has requested "visual, photometric, and spectroscopic observations of the symbiotic variable R Aqr in preparation for and in support of Chandra and HST observations currently scheduled for October 2017."

Alert Notices and Observing Campaigns webpages consolidated

In order to help simplify answering the question "What should I observe tonight?", we have consolidated some of the places on the AAVSO website to look for information on urgently-needed observations. As of July 31, 2017, the three webpages:

have been consolidated into one new page:

AAVSO Special Notice #430: AAVSO Special Notice is being discontinued

July 28, 2017: The AAVSO Special Notice is being discontinued as of July 28, 2017. This notice - #430 - is the last Notice of the publication.

The type of information supplied in AAVSO Special Notices will now be supplied in the AAVSO Alert Notices and/or in the AAVSO online forums on Campaigns & Observation Reports, Time Sensitive Reports, and the other Variable Star Observing and Variable Star forums, as appropriate.

Alert Notice 588: Long-term CCD monitoring of ER UMa-type variable DDE 48 in Vulpecula

July 21, 2017: The following request for AAVSO assistance has been received from Denis Denisenko (Sternberg Astronomical Institute, Moscow State University) to help characterize "...the cataclysmic variable DDE 48 in Vulpecula. This CV belongs to the rare ER UMa subtype of dwarf novae, with only 6 other stars in VSX being classified as UGER. According to 2016-2017 observations by Nikolay Mishevskiy (MNIC) and Denis Denisenko (DDE), this variable is very active, with superoutbursts to magnitude V=15.4 occurring approximately once a month.

Solar Bulletin - Volume 73, Number 06

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

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

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

Alert Notice 587: Observations of FI Vir (Ross 128) needed this week

July 17, 2017: Dr. Abel Méndez (University of Puerto Rico at Arecibo) has requested AAVSO assistance in follow-up observations of the flare star FI Vir (Ross 128) subsequent to his radio observations obtained yesterday (July 16) with the Arecibo and Green Bank (GBT) telescopes and the Allen Telescope Array (ATA).

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