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12 February CCD Photometry Guide update

The AAVSO Guide to CCD Photometry version 1.1 is now available for download.

This version contains several corrections and clarifications based on feedback from Ken Menzies and Tim Crawford. Thanks you two!

If you have comments or find inconsistencies, please send them to me and we will consider them for inclusion in the next revision.

Sara Beck, AAVSO Technical Assistant (sara@aavso.org)

12 February Special Notice #397: Bright Transient in Sco (PNV J17032620-3504140)

February 11, 2015: Patrick Schmeer (SPK, Bischmisheim, Germany) reports the announcement on the CBAT Transient Object Confirmation Page (TOCP) of the discovery of a bright transient in Sco on 2015 February 11.8367 UT at unfiltered CCD magnitude 8.2 by Tadashi Kojima (Gunma-ken, Japan) using a 150-mm f/2.8 lens + a digital camera. Kojima reports nothing is visible on a frame from the same camera on Feb. 10.827 UT.

09 February Campaign highlight: b Persei

Some of the best opportunities for contributing to astronomical research come through the AAVSO's Observing Campaigns, which are observing projects requested by individual researchers with a specific goal in mind. Some Campaigns are designed to last for a long time, and the results aren't known until well after the campaign concludes.  But some campaigns pay off immediately.  Our campaign on the bright star b Persei is an example of the latter, with a handful of AAVSO observers getting exactly the right data, at the right time, right away!

23 January Charts and Sequences Update January 2015

With APASS data release 8 filling in most of the remaining areas of sky with reliable secondary standards, the sequence team has been busy filling the remaining standing requests. This latest batch of new and revised sequences also has many newly discovered CVs from ASASSN, as well as sequences for RCB, NR and ZAND objects in the AID and VSX. You can downoad the list as either an .xlsx or .csv file.

21 January AAVSO Newsletter for January 2015 is published

AAVSO Newsletter 63, January 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.

20 January New eJAAVSO preprint: An eclipsing symbiotic nova in outburst?

ej295

The Curious Case of ASAS J174600-2321.3: an Eclipsing Symbiotic Nova in Outburst?

Stefan Hümmerich
Stiftstr. 4, Braubach, D-56338, Germany; American Association of Variable Star Observers (AAVSO), Cambridge, MA;
Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.V. (BAV), Berlin, Germany

Sebastián Otero
Olazabal 3650-8 C, Buenos Aires, 1430, Argentina; American Association of Variable Star Observers (AAVSO), Cambridge, MA

19 January Special Notice #396: Blazar PKS 0716+71 in very bright outburst

January 19, 2015: The blazar PKS 0716+71 == S5 0716+71 is currently in a very bright active state, at a visual magnitude of 12.1 as observed by G. Poyner on 2015 January 19.212 (JD 2457041.712).  The object was first noted in outburst by Arkharov et al.

19 January Two new eJAAVSO preprints: Maxima of 67 SPPs; Longterm monitoring of semiregulars

eJAAVSO

ej294

Recent Maxima of 67 Short Period Pulsating Stars

Gerard Samolyk

P.O. Box 20677, Greenfield, WI 53220

Received January 8, 2015; accepted January 8, 2015

Abstract

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

ejaavso292

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

Abstract

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.

http://www.aavso.org/jaavso-v42n2

06 January Alert Notice 507: Observations of the eclipsing binary b Persei

January 7, 2015: Dr.

04 January 2015 CHOICE Course Schedule

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.
15 December 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
Volume 42, Number 2, 2014

TABLE OF CONTENTS

Does the Period of a Pulsating Star Depend on its Amplitude?
John R. Percy, Jeong Yeon Yook    245

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
be "fourteen ell pee" and not "fourteen one pee".

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 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

ejaavso291

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

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