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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

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Recent Minima of 161 Eclipsing Binary Stars

   pdf

Gerard Samolyk

P.O. Box 20677, Greenfield, WI 53220

Received November 1, 2014; accepted November 1, 2014

Abstract

24 November New eJAAVSO preprint: Observations of novae from ROAD

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Observations of Novae From ROAD

   pdf

Franz-Josef Hambsch

Oude Bleken 12, B- 2400 Mol, Belgium

Presented at the 103rd Spring Meeting of the AAVSO, Big Bear Lake, CA,
June 13, 2014

Received August 11, 2014; revised September 9, 2014; accepted September 10, 2014

Abstract

24 November New eJAAVSO preprint: Pulsating star period-amplitude relation

ejaavso289

eJAAVSO

Does the Period of a Pulsating Star Depend on its Amplitude?

   pdf

John R. Percy
Jeong Yeon Yook

Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada

21 November New eJAAVSO preprint: V1073 Herculis and the Possible Detection of a Dwarf Companion

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First Photometric Study of the Short Period Solar Type Binary V1073 Herculis and the Possible Detection of a Dwarf Companion

   pdf

Ronald G. Samec
Faculty Research Associate, Pisgah Astronomical Research Institute, One Pari Drive, Rosman, NC 28772

19 November Solar Bulletin - Volume 70, Number 10

The October 2014 Solar Bulletin is now available.
 
Please visit the Solar Bulletin web page to download your copy: 

​http://www.aavso.org/solar-bulletin

 

19 November Three new eJAAVSO preprints

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Long-term Secular Changes in the Period of Mira Stars

   pdf

Thomas Karlsson

Almers väg 19, 432 51 Varberg, Sweden

Received June 3, 2014; revised October 8, 2014; accepted October 24, 2014

Abstract

17 November New eJAAVSO preprint: observing zeta Aur binary stars

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eJAAVSO

The Challenge of Observing the zeta Aurigae Binary Stars

   pdf

Frank J. Melillo


Holtsville Observatory, 14 Glen-Hollow Dr, E-16, Holtsville, NY 11742

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

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Amplitude Variations in Pulsating Yellow Supergiants

   pdf

John R. Percy
Rufina Y. H. Kim

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

Abstract

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?

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CT Lacertae: Another Long-period Carbon Star with Long-Timescale Variations?

   pdf

Matthew R. Templeton
Peter Maurer
Wolfgang Kriebel
Wayne M. Lowder (1932–2003)
Etienne Morelle
Steve O’Connor
Andrzej Arminski
Laurent Bichon
John E. Bortle

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!

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484