News and Announcements
|09 December||2015 JD Calendar||
The 2015 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.
|29 October||Special Notice #389: Possible Supernova in NGC 4303 (M61) - PSN J12215757+0428185||
October 29, 2014: The CBAT Transient Object Confirmation Page (follow-up page = http://www.cbat.eps.harvard.edu/unconf/followups/J12215757+0428185.html) reports the discovery of a possible supernova in M61 (NGC 4303) by Koichi Itagaki (Yamagata, Japan) on 2014 Oct. 29.8376 UT at magnitude 13.6 CCD unfiltered.
Coordinates: R.A. 12 21 57.57 Dec. +04 28 18.5 (2000.0)
|24 October||Alert Notice 505: Monitoring of Northern dwarf novae for radio jets campaign||
October 24, 2014: Ms. Deanne Coppejans (PhD candidate, Radboud University Nijmegen (Netherlands) and University of Cape Town) and colleagues have requested AAVSO observer assistance in monitoring several dwarf novae in support of their campaign to observe them in outburst with the Very Large Array (VLA) to search for radio jets.
|24 October||Silicon and Glass||
Everyone’s familiar with the term ‘bricks and mortar’. Many donors prefer to give to specific projects or programs that result in well-defined, tangible goods, such as the new wing of a building, a playground, or furniture and athletic equipment for a recreation center.
|24 October||Special Notice #388: Outburst of VSX J213806.5+261957||
October 23, 2014: Carey Chiselbrook (Georgia, United States; AAVSO observer code CCY) observed the WZ Sge-type dwarf nova VSX J213806.5+261957 in outburst at a visual magnitude of 9.7 on 2014 October 22.0590 (JD 2456952.55903). Prior to the outburst detection, the last observation (also by CCY) indicated the star was not in outburst less than 24 hours prior (mvis < 13.8 at JD 2456951.6326).
|22 October||Charts and Sequences Update October 22, 2014||
The following objects have had new or revised sequences added since the end of May. Please be sure you are using the most up to date charts and sequences if you observe any of these objects.
A complete listing of new and revised sequences for 2014 is available here.
|20 October||Solar Bulletin - Volume 70, Number 09||
The September 2014 Solar Bulletin is now available. Please visit the Solar Bulletinweb page to download your copy: http://www.aavso.org/solar-bulletin
|15 October||AAVSO Newsletter for October 2014 is published||
AAVSO Newsletter 62, October 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.
|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!