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04 June Alert Notice 484: Nova Sco 2013 = PNV J17335943-3606216

June 4, 2013:

Event: Nova Sco 2013 = PNV J17335943-3606216

Discovered by: Koichi Nishiyama (Kurume, Japan) and Fujio Kabashima (Miyaki, Japan)

Discovery Magnitude: unfiltered CCD magnitude 11.1, from two 40-s unfiltered CCD frames, using a 105-mm f/4 camera lens (+SBIG STL6303E camera)

Discovery date: 2013 June 03.6146 UT

Coordinates: R.A. = 17 33 59.44, Decl.= -36 06 20.7 (2000.0)

04 June Visual Observing Manual in French - 2013 edition

The French version of the newly revised Manual for Visual Observing of Variable Stars - Manuel pour l'observation visuelle des étoiles variables - is now available for download here:

http://www.aavso.org/visual-observing-manual-french

31 May Special Notice #355: V1108 Her next HST COS target followed by BD Pav

May 31, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471)and AAVSO Special Notice #354 (http://www.aavso.org/aavso-special-notice-354), HST/COS is scheduled to observe the WZ Sge-type cataclysmic variable V1108 Her:

V1108 Her  2013 June 6 09:32:19 through 13:42:14 UT

PLEASE NOTE THAT THE DATE HAS BEEN REVISED FROM SPECIAL NOTICE #354.

28 May New eJAAVSO preprint: Recent Minima of 273 Eclipsing Binary Stars

ej235: "Recent Minima of 273 Eclipsing Binary Stars" by G. Samolyk

www.aavso.org/ejaavso

23 May New eJAAVSO preprint: Intermediate Report on January 2013 Campaign: Photometry and Spectroscopy of P Cygni

ej234: "Intermediate Report on January 2013 Campaign: Photometry and Spectroscopy of P Cygni" by E. Pollmann and W. Vollmann

www.aavso.org/ejaavso

23 May AAVSO observers help solve a mystery about an important variable star

A group of astronomers led by Dr. James Miller-Jones of Curtin University and the International Centre for Radio Astronomy Research have published a revised distance to the famed variable star SS Cygni, solving a major mystery surrounding this star and its behavior.  Their work was made possible due to the dedication of dozens of observers worldwide who monitor SS Cygni and report their observations to the American Association of Variable Star Observers (AAVSO).

23 May New eJAAVSO preprint: Period Analysis of AAVSO Visual Observations of Semiregular (SR) Variable Stars. II

ej233: "Period Analysis of AAVSO Visual Observations of Semiregular (SR) Variable Stars. II" by J. R. Percy and T. Kojar

www.aavso.org/ejaavso

23 May New eJAAVSO preprint: Recent Maxima of 61 Short Period Pulsating Stars

ej232: "Recent Maxima of 61 Short Period Pulsating Stars" by G. Samolyk


www.aavso.org/ejaavso

22 May Special Notice #354: DT Oct obs crucial now, GW Lib and V1108 Her next targets

May 22, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and  AAVSO Special Notice #353 (http://www.aavso.org/aavso-special-notice-353), HST/COS is scheduled to observe the SU UMa-type cataclysmic variable DT Oct TOMORROW:

DT Oct  2013 May 23 23:31:07 through May 24 02:05:03 UT

22 May Two new eJAAVSO preprints: Simultaneous CCD Photometry of Two Eclipsing Binary Stars in Pegasus

ej230: "Simultaneous CCD Photometry of Two Eclipsing Binary Stars in Pegasus—Part 1: KW Peg" by K. B. Alton

ej231: "Simultaneous CCD Photometry of Two Eclipsing Binary Stars in Pegasus—Part 2: BX Peg" by K. B. Alton

www.aavso.org/ejaavso

19 May Second Annual AAVSO CCD School

Once again the AAVSO will be holding a week-long CCD School taught by AAVSO Director, Arne Henden!  The school will run July 8-12, 2013 and all classes will take place at AAVSO HQ. 

 

17 May Alert Notice 483: AH Her Observing Campaign

May 17, 2013: AAVSO assistance has been requested by Dr. Juan Echevarria (Universidad Nacional Autónoma de México) and colleagues in a campaign on the Z Cam-type cataclysmic variable AH Her being carried out 2013 May 29 - June 18. They will be making photometric and spectroscopic observations of AH Her using the 2.1m and 0.84m telescopes at San Pedro Martir Observatory (SPM).

16 May Events from the AAVSO Spring Meeting Broadcast Online!

For those who could not attend the AAVSO 2013 Spring Meeting in person but wish to take part, we will be broadcasting the following 2 events via GoToWebinar:

16 May Solar Bulletin - Volume 69, Number 4

The April 2013 Solar Bulletin is now available.

16 May Kepler planet-finding mission may be ending

NASA officials have announced that the spacecraft stabilizers on the Kepler satellite can no longer keep the spacecraft pointed accurately.  Plans are being developed to address the problems, but if they are unsuccessful, Kepler's extended mission to search for exoplanets may be ending.

For more information, see this article in SpaceflightNow.

14 May Two new eJAAVSO preprints

ej 229: "Book Review: Scientific Writing for Young Astronomers"(C. Sterken, ed.) reviewd by E. Broens

ej 228: "V1820 Orionis: an RR Lyrae Star With Strong and Irregular Blazhko Effect" by P. de Ponthière et al.

http://www.aavso.org/ejaavso

13 May Special Notice #353: SDSS J153817.35+512338.0 obs crucial now and DT Oct is next

May 13, 2013:  Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #351 (http://www.aavso.org/aavso-special-notice-351), HST/COS is scheduled to observe the dwarf nova SDSS J153817.35+512338.0:

SDSS J153817.35+512338.0 2013 May 16 22:44:06 through May 17 02:14:05 UT

09 May AAVSO Councilor Dr. Chryssa Kouveliotou elected to National Academy of Sciences

We are pleased and proud that AAVSO Council member Dr. Chryssa Kouveliotou has been elected to membership in the National Academy of Sciences.

08 May Special Notice #352: Correction to target name in Special Notice #351

May 8, 2013: In AAVSO Special Notice #351 (http://www.aavso.org/aavso-special-notice-351), one of the upcoming HST/COS targets was referred to as ASAS1600-48. The name of this system as found in VSX is ASAS J160048-4846.2. Please use this name when reporting observations to the AAVSO International Database. Many thanks.

ASAS J160048-4846.2, scheduled to be be observed 2013 Jul 8 UT, is a WZ Sge-type variable and is 17.9V at min and 12.6V at max.

08 May Special Notice #351: 1RXS J105010.3-140431 obs crucial now and upcoming targets

May 8, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471)and AAVSO Special Notice #350 (http://www.aavso.org/aavso-special-notice-350), HST/COS is scheduled to observe the eclipsing WZ Sge-type cataclysmic variable 1RXS J105010.3-140431:

1RXS J105010.3-140431  2013 May 10 07:51:01 through 12:01:57 UT

06 May Three new JAAVSO preprints

ej 225: "Two New Cool Variables in the Field of NGC 659" by Steven P. Souza

ej 226: "The Interesting Light Curve and Pulsation Frequencies of KIC 9204718" by Garrison Turner and John Holaday

ej 227: "Nine New Variable Stars in Cygnus and Variability Type Determination of [Wm2007] 1176" by Riccardo Furgoni

http://www.aavso.org/ejaavso

30 April Special Notice #350: 1RXS J105010.3-140431 and SDSS J153817.35+512338.0 next HST/COS targets

April 30, 2013:  Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471), HST/COS is scheduled to observe the eclipsing WZ Sge-type cataclysmic variable 1RXS J105010.3-140431:

1RXS J105010.3-140431  2013 May 10 07:51:01 through 12:01:57 UT

30 April Special Notice #349: HST/COS Observations CANCELLED for SDSS J154453.60+255348.8

April 30, 2013:  Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice 348 (http://www.aavso.org/aavso-special-notice-348), HST/COS was scheduled to observe the eclipsing dwarf nova SDSS J154453.60+255348.8 tonight:

SDSS J154453.60+255348.8 2013 May 1 04:06:20 through 08:17:24 UT

30 April New VStar Release

VStar version 2.15.1 has just been released. If you have been using VStar already, the new version will be automatically downloaded next time you open it. If you have never used VStar before (or don't know what it is) then you can learn about it and download the latest version from this page:

http://www.aavso.org/vstar-overview

There are also a lot of fantastic plugins available for VStar which you can get here:

http://www.aavso.org/vstar-plugin-library

28 April Optical observations of GRB 130427A

We're pleased to note that GCN Circular #14490 has been published, detailing time-series photometry of the bright GRB 130427A by Patrick Wiggins.  His observations provide a comprehensive record of the three hours of the early evolution of this incredibly bright afterglow.

Congratulations to Patrick on his observations!

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