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News and Announcements

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

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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

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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

Editorial

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:

Guía de Fotometría CCD de la AAVSO

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:

Guía de Fotometría CCD de la AAVSO

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

Comparison Between Synthetic and Photometric Magnitudes for the Sloan Standard Stars

02 June New JAAVSO preprint: Some personalities from variable star history

Some Personalities from Variable Star History

01 June New JAAVSO preprint: Margaret Harwood and Maria Mitchell Observatory

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Margaret Harwood and the Maria Mitchell Observatory

James W. Hanner
18 Alyssum Drive, Amherst, MA 01002

Received Jaunary 15, 2015; accepted May 21, 2015

Abstract

27 May New JAAVSO preprint: A binary model for emission line star FX Vel

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A Binary Model for the Emission Line Star FX Velorum

Mel Blake
Maisey Hunter

Department of Physics and Earth Science, University of North Alabama, One Harrison Plaza, Florence, AL 35630

27 May New JAAVSO preprint: Early-time flux measurements of SN 2014J

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Early-Time Flux Measurements of SN 2014J Obtained with Small Robotic Telescopes: Extending the AAVSO Light Curve

Björn Poppe
Thorsten Plaggenborg

Universitätssternwarte Oldenburg, Institute of Physics, Carl von Ossietzky University Oldenburg, Germany

21 May New JAAVSO preprint: delta Sct pulsation periods in KIC 5197256

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The δ Scuti Pulsation Periods in KIC 5197256

Garrison Turner
Big Sandy Community and Technical College, Prestonsburg, KY 41653

20 May New JAAVSO preprint: UXOR hunting among Algol variables

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UXOR Hunting among Algol Variables

Michael Poxon
9 Rosebery Road, Great Plumstead, Norfolk NR13 5EA, United Kingdom

Received February 18, 2015; revised March 31, 2015; accepted May 20, 2015

19 May Introducing the SID Data Grabber

Thanks to a great volunteer effort by George Silvis, Sudden Ionospheric Disturbance (SID) observers can now use the SID Data Grabber help prepare an AAVSO SID report file from their Stanford/SARA superSID monitor log files. Please visit the SID Data Grabber page to read more and download this handy application.

15 May New JAAVSO preprint: Recent minima of 149 EB stars

eJAAVSO

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Recent Minima of 149 Eclipsing Binary Stars

Gerard Samolyk

Abstract

14 May New JAAVSO preprint: Video Technique for Observing EB stars

eJAAVSO

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Video Technique for Observing Eclipsing Binary Stars

Hristo Pavlov, Anthony Mallama
 

Abstract

13 May New JAAVSO preprint: Sudden period change and dimming of V752 Cen

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Sudden Period Change and Dimming of the Eclipsing Binary V752 Centauri

Anthony Mallama, Hristo Pavlov

Abstract

12 May AAVSO Newsletter for April 2015 is published

AAVSO Newsletter 64, April 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.

23 April Annual Report for 2013-2014 is now online

Annual Report of the AAVSO for 2013-2014

http://www.aavso.org/annual-report

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