|03 July||VStar 2.16.8 release||
VStar 2.16.8 has just been released. Please visit the VStar Forum to lean 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:
|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||
Margaret Harwood and the Maria Mitchell Observatory
James W. Hanner
Received Jaunary 15, 2015; accepted May 21, 2015
|27 May||New JAAVSO preprint: A binary model for emission line star FX Vel||
A Binary Model for the Emission Line Star FX Velorum
|27 May||New JAAVSO preprint: Early-time flux measurements of SN 2014J||
Early-Time Flux Measurements of SN 2014J Obtained with Small Robotic Telescopes: Extending the AAVSO Light Curve
|21 May||New JAAVSO preprint: delta Sct pulsation periods in KIC 5197256||
The δ Scuti Pulsation Periods in KIC 5197256
|20 May||New JAAVSO preprint: UXOR hunting among Algol variables||
UXOR Hunting among Algol Variables
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||
Recent Minima of 149 Eclipsing Binary Stars
|14 May||New JAAVSO preprint: Video Technique for Observing EB stars|
|13 May||New JAAVSO preprint: Sudden period change and dimming of V752 Cen|
|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