|02 September||Special Notice #407: Blazar S5 1803+78 active||
September 2, 2015: AAVSO observer Adolfo Darriba Martinez y Oscar Ortuño (DAM, Observatorio Las Casqueras, Madrid, Spain) reports that the blazar S5 1803+78 has brightened significantly.
S5 1803+78, which is magnitude 16-17 V at minimum, is currently magnitude 14.237 V (LPAB, P. Lampens-Vancauteren (Ukkel, Belgium).
Previous outbursts are recorded in the AAVSO International Database in November 2007, February 2012, and September 2014.
|24 August||Alert Notice 527: 17 Cataclysmic variables to be observed by William Herschel Telescope||
August 26, 2015: Roque Ruiz-Carmona (Ph.D. candidate, Institute of Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen, The Netherlands) has requested AAVSO assistance with his campaign to observe (a new set of) 17 cataclysmic variables (CVs) with the William Herschel Telescope (WHT) next week.
|20 August||Alert Notice 526: Monitoring of LS IV -14 116 in support of upcoming satellite observations||
August 20, 2015: Prof. Simon Jeffery (Armagh Observatory; Trinity College Dublin) has requested photometric monitoring of the pulsating helium and zirconium-rich hot subdwarf LS IV -14 116 in support of upcoming HST and VLT/UVES spectroscopy. AAVSO observations will supplement photometry due to be obtained with the SAAO 1.0-m and IAC 0.8-m telescopes from 18 August to 2 September 2015. Photometry is requested beginning immediately through 2 September.
|12 August||Solar Bulletin - Volume 71, Number 07||
The July Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
The July SID Data report is available here: www.aavso.org/sid-database
|07 August||APASS: The AAVSO Photometric All-Sky Survey||
Data Release 9 is now available.
Through a grant from the Robert Martin Ayers Sciences Fund, the AAVSO is performing an all-sky photometric survey. This survey is conducted in five filters: Johnson B and V, plus Sloan g′, r′, i′. It is valid from about 7th magnitude to about 17th magnitude.
|07 August||Special Notice #406: KIC 02856960 entering eclipse window||
August 7, 2015: Further to AAVSO Alert Notice 525, we are entering the critical period of observations for KIC 02856960. Time series observations are urgently requested for this eclipsing binary beginning immediately (2015 August 07, JD 2457242) and continuing for the next five days, through the end of 2015 August 12.
|04 August||Special Notice #405: Request for Monitoring of V4641 Sgr||
Dr. Gregory Sivakoff (U. of Alberta) has requested optical monitoring of the galactic microquasar V4641 Sgr beginning immediately, and continuing for the next 120 days, or until it is no longer observable from your location.
|31 July||Alert Notice 525: Observing Campaign on KIC 02856960||
July 31, 2015: The AAVSO requests time-series observations of the eclipsing binary system KIC 02856960 beginning immediately, with intensive coverage urgently requested during the window of 2015 August 8.0 through August 12.0. Observations are requested on behalf of an international campaign coordinated by Dr.
|16 July||Alert Notice 524: Observing campaign on 17 cataclysmic variables||
July 16, 2015: Roque Ruiz-Carmona (Ph.D. candidate, Institute of Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen, The Netherlands) has requested AAVSO assistance with his campaign to observe 17 cataclysmic variables (CVs) with the William Herschel Telescope (WHT) next week.
|15 July||Solar Bulletin - Volume 71, Number 06||
The June Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
The June SID Data report is available here: www.aavso.org/sid-database
|10 July||Special Notice #404: V380 Oph in low state||
July 10, 2015: The novalike/VY Scl variable V380 Oph is in its low state and is undergoing a deep fading, according to observations by Adolfo Darriba Martinez on 2015 July 4 and 5 reported via VSNET, CBA, and to the AAVSO International Database.
|09 July||AAVSO Newsletter 65, July 2015 is published||
AAVSO Newsletter 65, July 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.
|06 July||2015 Fall Meeting Dates||
The 2015 Fall Meeting of the AAVSO will be held November 12-14 at the Hilton Hotel in Woburn, MA.
|03 July||VStar 2.16.8 release||
VStar 2.16.8 has just been released. Please visit the VStar Forum to learn more.
|01 July||Alert Notice 523: Correction to AAVSO Alert Notice 522||
July 1, 2015: In AAVSO Alert Notice 522 on the upcoming observations of the black hole X-ray binary V404 Cyg by HST, the date of the detection by the Swift satellite was incorrectly given as 2015 June 16.77197 UT (Barthelmy et al., GCN Circular 17929). The correct date is 2015 June 15.77197 UT.
Our sincere apologies for this error!
|01 July||Alert Notice 522: V404 Cyg HST multiwavelength observations scheduled||
Correction: In the text below, the date of the detection by the Swift satellite was incorrectly given as 2015 June 16.77197 UT. The correct date is 2015 June 15.77197 UT.
Our sincere apologies for this error!
July 1, 2015:
|01 July||Printed version of JAAVSO v. 43 n. 1 is now available||
The printed version of this issue is now available from createspace.com: https://www.createspace.com/5570976
For information on purchasing earlier issues of JAAVSO, please visit our online store: http://www.aavso.org/order-printed-jaavso
|29 June||Charts and Sequences Update June 2015||
The following objects have new or revised sequences.
|23 June||Alert Notice 521: Very rare outburst of the symbiotic variable AG Peg||
June 23, 2015: The symbiotic variable AG Peg is in outburst, the first one observed since its only known outburst, which occurred in 1860-1870. Currently at visual/V magnitude 7.2 (B=7.8), it is an excellent target for visual, PEP, CCD, and DSLR observers and spectroscopists. The current outburst began after 2015 May 27 UT (T. Markham, Leek, Staffordshire, England, from the BAAVSS online database) and was underway by June 13.90 (A. Kosa-Kiss, Salonta, Romania).
|19 June||JAAVSO volume 43, number 1 is published||
The printed version of this issue will be available soon. Please watch for the announcement on our main web page.
The Journal of the American Association of Variable Star Observers
Table of Contents
|18 June||Alert Notice 520: X-ray nova and LMXB V404 Cyg in rare outburst||
June 18, 2015: V404 Cyg, an X-ray nova and a low mass X-ray binary (LMXB) with black hole component, is undergoing its first reported X-ray and optical outburst since 1989. Large scale, rapid variations are being reported in wavelengths from X-ray to radio by professional and amateur astronomers worldwide.
|15 June||Alert Notice 519: Nova Sgr 2015 No. 2 fading as dust production rises||
June 15, 2015: Nova Sgr 2015 No. 2 (PNV J18365700-2855420; see AAVSO Alert Notice 512) is undergoing a significant fading visually as its infrared excess increases, indicating that substantial dust production is underway.
|12 June||Solar Bulletin - Volume 71, Number 05||
The May Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin The May SID Data report is available here: www.aavso.org/sid-database
|08 June||Guía de Fotometría CCD de AAVSO disponible en español||
Gracias al gran trabajo de un equipo de voluntarios españoles liderados por by Juan-Luis González Carballo (GCJ) y Josep Lluís Salto González (SJGA), tenemos el agrado de anunciar que la versión en español de la Guía de Fotometría CCD de la AAVSO ya está disponible para bajar:
|08 June||The AAVSO Guide to CCD Photometry in Spanish||
Thanks to a hard-working team of volunteers led by Juan-Luis González Carballo (GCJ) and Josep Lluís Salto González (SJGA), we are pleased to announce that a Spanish language version of the AAVSO Guide to CCD Photometry is now available for download: