News and Announcements
|19 October||Annual Meeting early registration ends Friday October 23!||
The planets are gathering on Friday, October 23rd to remind you that early registration for the AAVSO Annual meeting gathering in November ENDS the same day!
Also, if you are planning to give a talk or present a poster, please send your abstracts by Friday as well.
Everything you need to know about the meeting being held November 12-14 as well as registration and abstract submission forms can be found on this page:
|15 October||Visual Observing Manual in Greek||
Thanks to the hard work of volunteer Stelios Kleidis, the Manual for Visual Observing of Variable Stars is now available in Greek!
You can download individual chapters or the entire Manual here.
If you know of anyone who may benefit from this translation, please spread the word!
|15 October||Solar Bulletin - Volume 71, Number 09||
The September Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy:
The September SID Data report is available here: www.aavso.org/sid-database
|14 October||Alert Notice 531: Nova Ophiuchi 2015 Number 2 = TCP J17344775-2409042||
October 14, 2015
Event: Nova Oph 2015 No. 2 = TCP J17344775-2409042
Independent discovery by:
|08 October||Alert Notice 530: Nova Aquilae 2015 = ASASSN 15-qd = PNV J19215012+1509248||
October 8, 2015
Independent discovery by:
|02 October||Special Notice #408: Developing planetary systems dust production study - second segment of observations||
October 2, 2015: Further to AAVSO Alert Notice 511, issued in March 2015, Dr. George Rieke (University of Arizona) and colleagues' campaign to monitor planetary debris disks for variability using the Spitzer Space Telescope continues. AAVSO observations are requested to rule out variability of the stars themselves.
The second segment of observations of the four targets takes place from now into January 2016 according to the schedule below.
|01 October||Alert Notice 529: Observing campaign on 5 variables in Cygnus||
October 1, 2015: Dr. George Wallerstein (University of Washington) has requested AAVSO assistance in monitoring 5 variable stars in Cygnus now through December 2015. He is working to complete the radial velocity curves for these stars, and needs optical light curves for correlation with the spectra he will be obtaining.
|29 September||Alert Notice 528: Nova Sagittarii 2015 Number 3 = PNV J18033275-2816054||
September 29, 2015
Event: Nova Sgr 2015 No. 3 = PNV J18033275-2816054
Independently discovered by:
|14 September||Solar Bulletin - Volume 71, Number 8||
The August Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy:
The August SID Data report is available here: www.aavso.org/sid-database
|02 September||Special Notice #407: Blazar S5 1803+78 active||
September 2, 2015: AAVSO observer Adolfo Darriba Martinez y Oscar Ortuño (DAM, Observatorio Las Casqueras, Madrid, Spain) reports that the blazar S5 1803+78 has brightened significantly.
S5 1803+78, which is magnitude 16-17 V at minimum, is currently magnitude 14.237 V (LPAB, P. Lampens-Vancauteren (Ukkel, Belgium).
Previous outbursts are recorded in the AAVSO International Database in November 2007, February 2012, and September 2014.
|24 August||Alert Notice 527: 17 Cataclysmic variables to be observed by William Herschel Telescope||
August 26, 2015: Roque Ruiz-Carmona (Ph.D. candidate, Institute of Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen, The Netherlands) has requested AAVSO assistance with his campaign to observe (a new set of) 17 cataclysmic variables (CVs) with the William Herschel Telescope (WHT) next week.
|20 August||Alert Notice 526: Monitoring of LS IV -14 116 in support of upcoming satellite observations||
August 20, 2015: Prof. Simon Jeffery (Armagh Observatory; Trinity College Dublin) has requested photometric monitoring of the pulsating helium and zirconium-rich hot subdwarf LS IV -14 116 in support of upcoming HST and VLT/UVES spectroscopy. AAVSO observations will supplement photometry due to be obtained with the SAAO 1.0-m and IAC 0.8-m telescopes from 18 August to 2 September 2015. Photometry is requested beginning immediately through 2 September.
|12 August||Solar Bulletin - Volume 71, Number 07||
The July Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
The July SID Data report is available here: www.aavso.org/sid-database
|07 August||APASS: The AAVSO Photometric All-Sky Survey||
Data Release 9 is now available.
Through a grant from the Robert Martin Ayers Sciences Fund, the AAVSO is performing an all-sky photometric survey. This survey is conducted in five filters: Johnson B and V, plus Sloan g′, r′, i′. It is valid from about 7th magnitude to about 17th magnitude.
|07 August||Special Notice #406: KIC 02856960 entering eclipse window||
August 7, 2015: Further to AAVSO Alert Notice 525, we are entering the critical period of observations for KIC 02856960. Time series observations are urgently requested for this eclipsing binary beginning immediately (2015 August 07, JD 2457242) and continuing for the next five days, through the end of 2015 August 12.
|04 August||Special Notice #405: Request for Monitoring of V4641 Sgr||
August 4, 2015: Dr. Gregory Sivakoff (U. of Alberta) has requested optical monitoring of the galactic microquasar V4641 Sgr beginning immediately, and continuing for the next 120 days, or until it is no longer observable from your location.
|31 July||Alert Notice 525: Observing Campaign on KIC 02856960||
July 31, 2015: The AAVSO requests time-series observations of the eclipsing binary system KIC 02856960 beginning immediately, with intensive coverage urgently requested during the window of 2015 August 8.0 through August 12.0. Observations are requested on behalf of an international campaign coordinated by Dr.
|16 July||Alert Notice 524: Observing campaign on 17 cataclysmic variables||
July 16, 2015: Roque Ruiz-Carmona (Ph.D. candidate, Institute of Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen, The Netherlands) has requested AAVSO assistance with his campaign to observe 17 cataclysmic variables (CVs) with the William Herschel Telescope (WHT) next week.
|15 July||Solar Bulletin - Volume 71, Number 06||
The June Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
The June SID Data report is available here: www.aavso.org/sid-database
|10 July||Special Notice #404: V380 Oph in low state||
July 10, 2015: The novalike/VY Scl variable V380 Oph is in its low state and is undergoing a deep fading, according to observations by Adolfo Darriba Martinez on 2015 July 4 and 5 reported via VSNET, CBA, and to the AAVSO International Database.
|09 July||AAVSO Newsletter 65, July 2015 is published||
AAVSO Newsletter 65, July 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.
|06 July||2015 Fall Meeting Dates||
The 2015 Fall Meeting of the AAVSO will be held November 12-14 at the Hilton Hotel in Woburn, MA.
|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: