News and Announcements
|16 January||Special Notice #395: Alpha Com campaign cancelled||
January 16, 2015: We have been informed by PI Dr. Matthew Muterspaugh that his campaign on alpha Com (AAVSO Alert Notice 506) has been cancelled. Position measurements published a century ago contained errors that affected the predictions for the time of eclipse.
More information will be coming from Dr. Muterspaugh and we will disseminate it to everyone in an Alert Notice, but he asked that the observer community be informed now so that observing efforts might not be wasted.
|14 January||Solar Bulletin - Volume 70, Number 12||
The December 2014 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
|14 January||New eJAAVSO preprint: Revised elements of 78 southern EB systems||
Revised Light Elements of 78 Southern Eclipsing Binary Systems
Margaret Streamer, Jeff Byron, David J. W. Moriarty, Tom Richards, Bill Allen, Roy Axelsen, Col Bembrick, Mark Blackford, Terry Bohlsen, David Herald, Roland Idaczyk, Stephen Kerr, Ranald McIntosh, Yenal Ogmen, Jonathan Powles, Peter Starr, George Stockham
|12 January||Special Notice #394: Observations of b Persei urgently requested||
January 12, 2015: Photometry by P. Benni (AAVSO observer code BPAD; Massachusetts, United States), D. Collins (CDK; North Carolina, United States), F. Campos (CFRA; Catalunya, Spain), and F. Melillo (MFR; New York, United States) suggest that b Persei may have entered eclipse around JD 2457033.6 (2015 January 11.1 UT). Time-series photometric observations of this bright star are urgently requested beginning immediately, and continuing for the next two weeks (through at least 2015 January 26 UT) and possibly beyond.
|07 January||JAAVSO Vol. 42, No. 2, 2014 printed copies available||
Paper copy from createspace.com is available for $12 plus shipping.
|06 January||Alert Notice 507: Observations of the eclipsing binary b Persei||
January 7, 2015: Dr.
|04 January||2016 CHOICE Course Schedule||
We are pleased to announce the return of many of your favorite CHOICE courses this year.
The tentative schedule is listed below. Click on the course name to read its description. Dates and classes may change due to availability of instructors for the courses.
|30 December||The last fundraising letter||
Dear AAVSO Supporters,
This is the last fundraising letter you will get from the AAVSO in 2014, I promise.
Solar Bulletin - Volume 70, Number 11
The November 2014 Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy: http://www.aavso.org/solar-bulletin
|11 December||JAAVSO Vol. 42, No. 2, 2014 is published||
Journal of the American Association of Variable Star Observers
TABLE OF CONTENTS
Does the Period of a Pulsating Star Depend on its Amplitude?
|11 December||Special Notice #393: Correction to Special Notice #392 [ASASSN-14lp]||
December 11, 2014: In AAVSO Special Notice #392, the name of the supernova discovered in NGC 4666 was given as ASASSN-141p. It should have been ASASSN-14lp. That is to say, the text following the dash should
Please create charts and submit observations using the name ASASSN-14lp.
Sincere apologies for the error!
|11 December||Special Notice #392: ASASSN-14lp = Type Ia Supernova in NGC 4666 (Virgo)||
December 11, 2014: T. W.-S. Holoien et al. announce in The Astronomer's Telegram (ATel) #6795 (http://www.astronomerstelegram.org/?read=6795) the discovery of a transient in NGC 4666 at magnitude 14.3 V on 2014 December 9.61 UT. The discovery was made in the course of the All Sky Automated Survey for SuperNovae (ASASSN) search, and the object assigned the name ASASSN-14lp. ASASSN-14lp was not seen (<15.3 V) in poor-quality ASASSN images obtained on 2104 Dec. 08.35 UT.
|09 December||2016 JD Calendar||
The 2016 Julian Day calendar is now available for your viewing or downloading pleasure.
|03 December||Datos de la BAAVSS ahora disponibles a través de la AAVSO||
La American Association of Variable Star Observers (AAVSO) y la British Astronomical Association Variable Star Section (BAAVSS) tienen el agrado de anunciar que el archivo de observaciones de estrellas variables de la BAAVSS ya está disponible a través del sitio web de AAVSO. Los archivos de la BAAVSS cuentan con más de 2,5 millones de observaciones de estrellas variables realizadas en su mayoría por astrónomos aficionados de todo el mundo durante los pasados 150 años.
|02 December||Special Notice #391: Targets Remaining in Northern Dwarf Novae Campaign||
December 2, 2014: AAVSO Alert Notice 505 (http://www.aavso.org/aavso-alert-notice-505) announced the campaign on several northern dwarf novae by Deanne Coppejans and colleagues. This campaign, searching for radio jets in dwarf novae, has been moving very quickly! Thanks to your observations and timely notifications, three of the five sets of VLA observations available for the targets have been used on Z Cam, RX And, and YZ Cnc. The PI is extremely appreciative and thanks you all for your excellent work.
|02 December||BAAVSS data now available through the AAVSO||
The American Association of Variable Star Observers (AAVSO) and the British Astronomical Association Variable Star Section (BAAVSS) are pleased to announce that the variable star observation archive of the BAAVSS is now available through the website of the AAVSO. The BAAVSS archives comprise over 2.5 million variable star observations made mostly by amateur astronomers world-wide over the past 150 years. These data now join the archives of the AAVSO in the AAVSO International Database, which consists of over 25 million variable star observations made
|02 December||New eJAAVSO preprint: Recent minima of 161 EB stars||
Recent Minima of 161 Eclipsing Binary Stars
P.O. Box 20677, Greenfield, WI 53220
Received November 1, 2014; accepted November 1, 2014
|24 November||New eJAAVSO preprint: Observations of novae from ROAD||
Observations of Novae From ROAD
Oude Bleken 12, B- 2400 Mol, Belgium
Presented at the 103rd Spring Meeting of the AAVSO, Big Bear Lake, CA,
Received August 11, 2014; revised September 9, 2014; accepted September 10, 2014
|24 November||New eJAAVSO preprint: Pulsating star period-amplitude relation||
Does the Period of a Pulsating Star Depend on its Amplitude?
John R. Percy
|21 November||New eJAAVSO preprint: V1073 Herculis and the Possible Detection of a Dwarf Companion||
First Photometric Study of the Short Period Solar Type Binary V1073 Herculis and the Possible Detection of a Dwarf Companion
Ronald G. Samec
|19 November||Solar Bulletin - Volume 70, Number 10||
The October 2014 Solar Bulletin is now available.
|19 November||Three new eJAAVSO preprints||
Long-term Secular Changes in the Period of Mira Stars
Almers väg 19, 432 51 Varberg, Sweden
Received June 3, 2014; revised October 8, 2014; accepted October 24, 2014
|17 November||New eJAAVSO preprint: observing zeta Aur binary stars||
The Challenge of Observing the zeta Aurigae Binary Stars
Frank J. Melillo
Received March 31, 2014; revised May 12, 2014 and June 12, 2014; accepted June 12, 2014
|10 November||Special Notice #390: New possible WZ Sge variable ASASSN-14jv||
November 10, 2014: Astronomer's Telegram (ATel) #6676 (B.J. Shappee et al. 2014) notes the discovery of ASASSN-14jv, a bright optical transient found at V=11.3 on 2014 November 9.19 (JD 2456970.69). This object is suspected to be a cataclysmic variable of the WZ Sge subtype. Shappee et al. note that the source is less than one arcsecond away from a g=19.1 magnitude source in the Kepler Input Catalog, suggesting a large amplitude typical of UGWZ stars.
|03 November||The AAVSO Director search results are in!||
Hello Members, Observers, Colleagues, and Friends,
As you may know, Dr. Arne A. Henden is retiring as Director of the AAVSO at the end of January 2015 after ten years of devoted service to the Association.