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News and Announcements

18 August Solar Bulletin - Volume 70, Number 7
The July 2014 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
06 August Alert Notice 503: Request for regular monitoring of the symbiotic variable RT Cru

August 6, 2014: Dr. Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) and colleagues have requested AAVSO observer assistance in their campaign on the symbiotic variable RT Cru. Weekly or more frequent monitoring beginning now is requested in support of upcoming Chandra observations still to be scheduled.

31 July New eJAAVSO preprint: Twenty-Two New Variable Stars in the Northern Sky

ejaavso 274

eJAAVSO

Twenty-Two New Variable Stars in the Northern Sky and Light Elements Improvement for PT Lyr, [WM2007] 1157, and [WM2007] 1160

   pdf

Riccardo Furgoni

28 July CHOICE Fall Schedule 2014

The Fall Schedule of CHOICE courses has been set. Most courses are available to AAVSO members AND the general public.  Class size is limited to 15 people, so sign up as soon as you can to save a seat.​ Registrations are available on a first-come, first-serve basis, and are handled through our online store. The fee for AAVSO members is $30.00. Non-members pay $50.00.

24 July Special Notice #387: EE Cep eclipse and comparison stars

July 24, 2014:The eclipse of EE Cep (AAVSO Alert Notice 502) appears to be gradually beginning, according to observations in the AAVSO International Database. Please observe this system according to the instructions given in the Alert Notice.

09 July Alert Notice 502: EE Cep observations requested for upcoming eclipse

July 9, 2014: The AAVSO requests observations for the upcoming eclipse of EE Cephei, a long-period eclipsing variable. EE Cep has a period of 2,050 days, and shows strong variations in the eclipse light curve from one event to the next. Observations are needed to study the morphology of the upcoming eclipse, which will be used to better understand the shape of the eclipsing disk and how it precesses. Mid-eclipse is predicted to be August 23, 2014, but the early stages of the eclipse may begin as much as a month earlier.

03 July AAVSO Newsletter for July 2014 is published

AAVSO Newsletter 61, July 2014 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.

30 June Paper copies of JAAVSO v42 n1 are now available
eJAAVSO
Volume 42 Number 1 2014

Paper copy from createspace.com is available for $12 plus shipping.

http://www.aavso.org/jaavso-v42n1

26 June VStar 2.16.1 Release

A new version of VStar has just been released! This version contains security upgrades and will re-enable the Plug-in Manager and discrepant observation reporting that were disabled in the wake of the AAVSO Security breach. (Please note that the Members-only BSM and APASS Epoch Photometry plugins are still not available until further security measures can be implemented.)

In addition to the security upgrades, David Benn has also corrected several bugs and incorporated other changes based on valuable feedback from participants in his recent VStar CHOICE course. 

25 June Visual Observing Manual in Persian - 2013 edition

The Persian (Farsi) version of the June 2013 revision of Manual for Visual Observing of Variable Stars - راهنمای رصد بصری ستارگان متغیر is now available for download here:

http://www.aavso.org/visual-observing-manual-persian

This Manual is available free-of-charge and may be reproduced and distributed as needed.

24 June New eJAAVSO preprint: Multi-band differential photometry

Multi-band Differential Photometry of the Eclipsing Variable Star NSVS 5750160
Robert C. Berrington, Erin M. Tuhey

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www.aavso.org/ejaavso

24 June JAAVSO Vol. 42, No. 1, 2014, is published

JAAVSO Volume 42, Number 1, 2014 is published. The issue can be downloaded by AAVSO members as a pdf file.

The printed version of this issue will be available soon.

http://www.aavso.org/jaavso-published-volumes

20 June Special Notice #386: ASASSN-14cl New large-amplitude cataclysmic variable

June 20, 2014: Kris Z. Stanek (The Ohio State University) et al. reported the discovery during the ongoing All-Sky Automated Survey for SuperNovae (ASAS-SN) of a bright transient (10.66V) on 2014 June 14.52 UT. Data were obtained using the quadruple 14-cm "Brutus" telescope in Haleakala, HI (hosted by Las Cumbres Observatory Global Telescope Network).(ATel #6233, http://www.astronomerstelegram.org/?read=6233)

30 May Three new eJAAVSO preprints: Red Supergiants; Z Cam Stars; tribute to Leslie Peltier

ej258: "Amplitude Variations in Pulsating Red Supergiants" by John R. Percy, Viraja C. Khatu

ej257: "Leslie Peltier: The World’s Greatest Amateur Astronomer" by Mike Simonsen

ej256: "Z Cam Stars in the Twenty-First Century" by Mike Simonsen, David Boyd, William Goff, Tom Krajci, Kenneth Menzies, Sebastian Otero, Stefano Padovan, Gary Poyner, James Roe, Richard Sabo, George Sjoberg, Bart Staels, Rod Stubbings, John Toone, Patrick Wils

www.aavso.org/ejaavso

 

27 May Charts and Sequences Update May 2014

The following objects have been given new or revised sequences since January 1, 2014. If you observe any of these objects, please check to see you have the latest versions of the charts and sequences for your targets.

A full listing of new and revised sequences, for this year and going back to 2009, is available here on Google Drive. You can also download this list as .xlasx or .csv below.

15 May Solar Bulletin - Volume 70, Number 04

 The April 2014 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin

13 May Special Notice #385: SBS 1108+574 HST/COS observations crucial NOW

May 13, 2014: The HST/COS observations of the cataclysmic variable SBS 1108+574 described in AAVSO Alert Notice 501 and Special Notice #384 are scheduled for 2014 May 16 06:19:04 - 15:16:56 UT.

Your observations TONIGHT AND PARTICULARLY TOMORROW NIGHT ARE CRUCIAL!

13 May New eJAAVSO preprint: Multi-Longitude Observation Campaign of KV Cancri

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"Multi-Longitude Observation Campaign of KV Cancri:an RR Lyrae Star with Irregular Blazhko Modulations"

by Pierre de Ponthière, Michel Bonnardeau, Franz-Josef (Josch) Hambsch, Tom Krajci, Kenneth Menzies, Richard Sabo

www.aavso.org/ejaavso

09 May Special Notice #384: SBS 1108+574 HST/COS obs next week

May 9, 2014: The HST/COS observations of the cataclysmic variable SBS 1108+574 described in AAVSO Alert Notice 501 have been pushed back a few days. The new exact time of the observations is:

                 SBS 1108+574      2014 May 16 06:19:04 - 15:16:56 UT

09 May New eJAAVSO preprint: Seven Years of Globe at Night Data

Analysis of Seven Years of Globe at Night Data

by Jennifer J. Birriel, Constance E. Walker, and Cory R. Thornsberry

ej253

www.aavso.org/ejaavso

29 April Alert Notice 501: Monitoring requested for HST/COS observations of SBS 1108+574

April 29, 2014: Dr. Peter Garnavich (University of Notre Dame) and Dr. Paula Szkody (University of Washington) have requested the help of AAVSO observers in monitoring the cataclysmic variable SBS 1108+574 (= CSS 120422:111127+571239) in support of upcoming Hubble Space Telescope observations. The HST COS (Cosmic Origins Spectrograph) will be carrying out far-ultraviolet spectroscopy of this target on 2014 May 12-13 UT.

17 April Solar Bulletin - Volume 70, Number 03

The March 2014 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin

03 April AAVSO Newsletter 60 is now published

AAVSO Newsletter 60 (April 2014) is now available:

http://www.aavso.org/aavso-newsletter

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.

02 April Alert Notice 500: Novae in Scorpius and Cygnus

April 2, 2014

1. Nova Scorpii 2014 = TCP J17154683-3128303
2. Nova Cygni 2014 = PNV J20214234+3103296


1. Nova Scorpii 2014 = TCP J17154683-3128303

Event: Nova Scorpii 2014 = TCP J17154683-3128303

Discovered by: Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan)

27 March Special Notice #383: Transient in Scorpius = TCP J17154683-3128303

March 27, 2014: Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan) report (via the IAU CBAT TOCP page, http://www.cbat.eps.harvard.edu/unconf/tocp.html) their discovery of a transient in Scorpius:
R.A. 17 15 46.83  Dec. -31 28 30.3  (2000.0)
2014 Mar. 26.84867 UT, magnitude 10.1 unfiltered CCD

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