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News and Announcements

02 June New JAAVSO preprint: Some personalities from variable star history

Some Personalities from Variable Star History

01 June New JAAVSO preprint: Margaret Harwood and Maria Mitchell Observatory

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Margaret Harwood and the Maria Mitchell Observatory

James W. Hanner
18 Alyssum Drive, Amherst, MA 01002

Received Jaunary 15, 2015; accepted May 21, 2015

Abstract

27 May New JAAVSO preprint: A binary model for emission line star FX Vel

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A Binary Model for the Emission Line Star FX Velorum

Mel Blake
Maisey Hunter

Department of Physics and Earth Science, University of North Alabama, One Harrison Plaza, Florence, AL 35630

27 May New JAAVSO preprint: Early-time flux measurements of SN 2014J

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Early-Time Flux Measurements of SN 2014J Obtained with Small Robotic Telescopes: Extending the AAVSO Light Curve

Björn Poppe
Thorsten Plaggenborg

Universitätssternwarte Oldenburg, Institute of Physics, Carl von Ossietzky University Oldenburg, Germany

21 May New JAAVSO preprint: delta Sct pulsation periods in KIC 5197256

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The δ Scuti Pulsation Periods in KIC 5197256

Garrison Turner
Big Sandy Community and Technical College, Prestonsburg, KY 41653

20 May New JAAVSO preprint: UXOR hunting among Algol variables

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UXOR Hunting among Algol Variables

Michael Poxon
9 Rosebery Road, Great Plumstead, Norfolk NR13 5EA, United Kingdom

Received February 18, 2015; revised March 31, 2015; accepted May 20, 2015

19 May Introducing the SID Data Grabber

Thanks to a great volunteer effort by George Silvis, Sudden Ionospheric Disturbance (SID) observers can now use the SID Data Grabber help prepare an AAVSO SID report file from their Stanford/SARA superSID monitor log files. Please visit the SID Data Grabber page to read more and download this handy application.

15 May New JAAVSO preprint: Recent minima of 149 EB stars

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Recent Minima of 149 Eclipsing Binary Stars

Gerard Samolyk

Abstract

14 May New JAAVSO preprint: Video Technique for Observing EB stars

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Video Technique for Observing Eclipsing Binary Stars

Hristo Pavlov, Anthony Mallama
 

Abstract

13 May New JAAVSO preprint: Sudden period change and dimming of V752 Cen

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Sudden Period Change and Dimming of the Eclipsing Binary V752 Centauri

Anthony Mallama, Hristo Pavlov

Abstract

12 May AAVSO Newsletter for April 2015 is published

AAVSO Newsletter 64, April 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.

23 April Annual Report for 2013-2014 is now online

Annual Report of the AAVSO for 2013-2014

http://www.aavso.org/annual-report

16 April Special Notice #403: GW Lib HST schedule set

April 16, 2015: Further to AAVSO Alert Notice 513, Dr. Paula Szkody (University of Washington) informs us that the HST observations for the cataclysmic variable GW Lib have been scheduled for

2015 April 22 04:04:36 - 09:00:06 UT.

16 April Solar Bulletin - Volume 71, Number 3

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

http://www.aavso.org/solar-bulletin

The March SID Data report is available here: www.aavso.org/sid-database

15 April Alert Notice 518: Observations of 2MASS J06593158-0405277 needed

April 15, 2015: Dr. Fabienne A. Bastien (Hubble Postdoctoral Fellow, Pennsylvania State University) has requested AAVSO assistance in monitoring the rare FU Ori object 2MASS J06593158-0405277 as part of a campaign to observe this T Tauri star from the optical to the infrared in the coming weeks.  

13 April Special Notice #402: RW Aur more intense monitoring needed now

April 13, 2015: Further to AAVSO Alert Notice 514, the Chandra observations of the classical T Tauri star RW Aur (component A) have been scheduled and will take place

2015 April 16 6:30 - 17:37 UT

03 April Special Notice #401: AM Her NuSTAR observations April 5

April 3, 2015: Further to AAVSO Alert Notice 517 (www.aavso.org/aavso-alert-notice-517), Dr. Axel Schwope (Leibniz Institute for Astrophysics Potsdam, Germany) informs us that the NuSTAR X-ray observations of AM Her will take place on

2015 April 5  15:35 UTC - April 6 19:15 UTC

These NuSTAR observations overlap with the XMM-Newton observations scheduled for April 6.

02 April Alert Notice 517: Monitoring of AM Her urgently requested in support of XMM-Newton and NuSTAR observations

April 2, 2015: Dr. Axel Schwope (Leibniz Institute for Astrophysics Potsdam, Germany) has requested AAVSO observers' assistance in monitoring the magnetic variable AM Her in support of upcoming XMM-Newton plus NuSTAR (Nuclear Spectroscopic Telescope Array) observations.

The XMM-Newton observations are scheduled for 2015 April 06 02:37:02-15:07:02 UT. The NuSTAR observations have not been made final yet but are expected to run longer. A Special Notice will be issued when the NuSTAR schedule is known.

02 April Alert Notice 516: Nova Oph 2015 = PNV J17291350-1846120

April 2, 2015


Event: Nova Oph 2015 = PNV J17291350-1846120

Discovered by: Yukio Sakurai, Ibaraki-ken, Japan

Discovery magnitude: 12.2 unfiltered, using 180-mm f/2.8 lens

Discovery date: 2015 March 29.766 UT

Coordinates:  R.A. 17 29 13.58   Dec. -18 46 11.7  (2000.0)

31 March Alert Notice 515: SN 2015F in NGC 2442 (PSN J07361576-6930230)

March 31, 2015

Event: Supernova in NGC 2442: SN 2015F = PSN J07361576-6930230

Discovered by: Libert A. G. Monard, Calitzdorp, Western Cape, South Africa

Discovery magnitude: 16.8 unfiltered CCD using a 35-cm RCX400 telescope (+SBIG ST8-XME camera)

Discovery date: 2015 March 9.789 UT

27 March Charts and Sequences Update March 2015

The following objects have new or revised sequences. If you observe any of these objects you should update your charts as soon as possible. You can download the entire list in .xlsx or .csv format below. Our sincere thanks to Tom Bretl and the charts and sequences team for their continued hard work.

 

24 March Alert Notice 514: RW Aur monitoring requested

March 24, 2015: Dr. Hans Moritz Guenther (Massachusetts Institute of Technology) has requested AAVSO observers' assistance with the classical T Tauri star RW Aur (component A). He writes:
 
"RW Aur A is a classical T Tauri surrounded by an accretion disk. It's a visual binary; the B component is fainter and shows no sign of a disk. The separation is 1.4 arcsec, but the B component is so much fainter (V = 13.6) that it's not a problem if the binary is not resolved.

18 March Alert Notice 513: Request for observations of GW Lib in support of HST observations

March 18, 2015: Dr. Paula Szkody, University of Washington, has requested our help in monitoring the cataclysmic variable GW Lib for upcoming Hubble Space Telescope observations, scheduled to be made during the window 2015 April 22-25 UT. Dr. Szkody also observed this object with HST in March 2011 and March 2010 (see AAVSO Alert Notices 433 and 417, respectively).

16 March Alert Notice 512: Nova Sagittarii 2015 No. 2 = PNV J18365700-2855420

March 16, 2015

Event: Nova Sagittarii 2015 No. 2 = PNV J18365700-2855420

Discovered by: John Seach, Chatsworth Island, NSW, Australia

Discovery magnitude: 6.0 using DSLR and 50mm f/1.0 lens

Discovery date: 2015 March 15.634 UT

Coordinates:  R.A. 18 36 56.84   Dec. -28 55 39.8  (2000.0)

13 March Special Notice #400: BF Cyg observations requested

March 13, 2015: Dr. George Wallerstein (University of Washington) informed us that the symbiotic variable BF Cygni has brightened considerably over the past few weeks, and he is currently obtaining spectroscopy of it.  

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