News and Announcements
|07 October||Alert Notice 506: Alpha Com eclipse observing campaign||
January 16, 2015: THIS CAMPAIGN HAS BEEN CANCELLED. PLEASE SEE AAVSO SPECIAL NOTICE #395 FOR DETAILS.
December 5, 2014: Drs. Matthew W. Muterspaugh and Gregory W. Henry (Tennessee State University) have requested AAVSO observers' assistance in monitoring the possible Algol-like binary star alpha Com before, during, and after the eclipse they have predicted for mid-to-late January 2015.
|29 September||New eJAAVSO preprint: Amplitude variations in pulsating yellow supergiants||
Amplitude Variations in Pulsating Yellow Supergiants
John R. Percy
Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada
Received June 12, 2014; revised July 24, 2014; accepted July 24, 2014
|17 September||Alert Notice 504: Epsilon Aur monitoring during predicted pulsation phase||
September 17, 2014: Dr. Robert Stencel (University of Denver Astronomy Program) has requested that AAVSO observers monitor epsilon Aurigae from now through the end of the observing season.
|12 September||New eJAAVSO preprint: CT Lac--Long-period Carbon Star with Long-Timescale Variations?||
CT Lacertae: Another Long-period Carbon Star with Long-Timescale Variations?
Matthew R. Templeton
AAVSO, 49 Bay State Road, Cambridge, MA 02138
|11 September||Announcing the 2014 AAVSO Council Nominees||
Please click on the name of the nominee to view his/her online biography. Council election ballots were mailed to each member in mid-September. Best of luck to all of our nominees!
|05 September||Two new eJAAVSO preprints: O-C Methods; EQ Eri||
Methods for O–C (Observed Minus Computed) Diagrams and for the Determination of Light Elements of Variable Stars with Linear and Second Order Polynomial Ephemerides
Roy Andrew Axelsen
Received July 24, 2014; accepted July 28, 2014
|03 September||New eJAAVSO preprint: 23 New Variable Stars||
23 New Variable Stars
Received May 20, 2014, accepted June 30, 2014
|28 August||New eJAAVSO preprint: V393 Car, current light elements||
Current Light Elements of the δ Scuti Star V393 Carinae
Received May 1, 2014; revised July 1, 2014; accepted July 1, 2014
|28 August||New eJAAVSO preprint: AL Pictoris and FR Piscium: Two Regular Blazhko RR Lyrae Stars||
AL Pictoris and FR Piscium: Two Regular Blazhko RR Lyrae Stars
Pierre de Ponthière
Franz-Josef (Josch) Hambsch
|27 August||Two new eJAAVSO preprints: Sloan Magnitudes for the Brightest Stars; BVRI Photometry of SN 2013ej||
Sloan Magnitudes for the Brightest Stars
14012 Lancaster Lane, Bowie, MD 20715
Received April 8, 2014; revised June 23, 2014; accepted July 8, 2014
|20 August||New DSLR Observing Manual Available Free From AAVSO||
The AAVSO is pleased to announce the availability of our new DSLR Observing Manual.
|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||
Twenty-Two New Variable Stars in the Northern Sky and Light Elements Improvement for PT Lyr, [WM2007] 1157, and [WM2007] 1160
|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||
Paper copy from createspace.com is available for $12 plus shipping.
|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:
This Manual is available free-of-charge and may be reproduced and distributed as needed.
|25 June||New eJAAVSO preprint: Multi-band differential photometry||
Multi-band Differential Photometry of the Eclipsing Variable Star NSVS 5750160
|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.
|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