News and Announcements
|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
|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.
|13 May||New eJAAVSO preprint: Multi-Longitude Observation Campaign of KV Cancri||
"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
|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:
|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
|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:
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
|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:
|24 March||The AAVSO International Database Breaks Twenty-Five Million Observations!||
Over the weekend the AAVSO International Database (AID) hit an important milestone. We broke the twenty-five million mark! We would like to express our appreciation to each and every observer who has contributed even a single observation to that total.
|17 March||Special Notice #382: SDSS J100658.40+233724.4 observations crucial now||
March 17, 2014: HST/COS is scheduled to observe the the U Gem-type dwarf nova
|14 March||Alert Notice 499: Predicted occultation of Regulus||
March 14, 2014: On 2014 March 20 at approximately 02:06 a.m. EDT (06:06 UT), an occultation of Regulus (alf Leo, magnitude 1.4 V) by the magnitude-12.4 V asteroid (163) Erigone will take place. The occultation track includes Bermuda and northwest along a corridor stretching from the mid-Atlantic USA through Ontario, Canada.
|14 March||Solar Bulletin - Volume 70, Number 02||
The February 2014 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
|10 March||Alert Notice 498: Nova Cephei 2014 = TCP J20542386+6017077||
March 10, 2014:
|06 March||Annual Report for 2012-2013 is now online||
Annual Report of the AAVSO for 2012-2013
|05 March||Special Notice #381: HST/COS observations of SDSS J100658.40+233724.4||
March 5, 2014: HST/COS are being scheduled for the U Gem-type dwarf nova SDSS J100658.40+233724.4, the 40th and final target of the major CV observing campaign organized in 2012 by Drs. Boris Gaensicke, Joseph Patterson, Arne Henden, and 13 other astronomers (see AAVSO Alert Notice 471 and note below). A precise time will be announced later, but the scheduled HST observing window is:
|27 February||AAVSO Bulletin 77 for 2014||
Predicted Dates of Maxima and Minima of 381 Long Period Variables for 2014
|21 February||Asteroids Mikesimonsen and Mariomotta||
Congratulations to AAVSO staff member Mike Simonsen, and to AAVSO Past President Mario Motta who each have had an asteroid named in their honor by the IAU Minor Planet Center.
|18 February||New CHOICE courses offered for spring||
Registration is now open for three CHOICE courses being offered this spring.
CHOICE: How To Use VPHOT (March 17 - April 11)
CHOICE: Variable Star Classification and Light Curves (April 14 - May 9)
CHOICE: How To Use VStar (May 12 - June 6)
Courses are $30 for members and $50 for non-members.
|11 February||Alert Notice 497: Nova Sagittarii 2014 = PNV J18250860-2236024 AND Erratum||
February 11, 2014
|07 February||Alert Notice 496: Outburst of the recurrent nova V745 Sco||
February 7, 2014
|06 February||Aviso Especial #380: Erupción reportada de la nova recurrente V0745 Sco|