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Charts and Sequences Update June 2015

The following objects have new or revised sequences.

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).

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
Volume 43, Number 1, 2015

Table of Contents


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.

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.

Solar Bulletin - Volume 71, Number 05

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

The May SID Data report is available here:


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:

Guía de Fotometría CCD de la AAVSO

Además de Juan-Luis y Josep Lluís, participaron en la traducción Rafael Benavides Palencia (PNQ), David Cejudo Fernández (CDZ), Antonio Celiá Miró, Fernando Limón Martínez (LFEA) y Miguel Rodríguez Marco (RMU).

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:

Guía de Fotometría CCD de la AAVSO

In addition to Juan-Luis and Josep Lluís, translators included Rafael Benavides Palencia (PNQ), David Cejudo Fernández (CDZ), Antonio Celiá Miró, Fernando Limón Martínez (LFEA), and Miguel Rodríguez Marco (RMU).

New JAAVSO preprint: Synthetic and photometric mags for Sloan standard stars

Comparison Between Synthetic and Photometric Magnitudes for the Sloan Standard Stars


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