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News and Announcements

24 June Special Notice #360: CC Scl observations critical this week

June 24, 2013: HST/COS is scheduled to observe the SU UMa-type dwarf nova CC Scl:

CC Scl   2013 June 27 02:12:04 through 05:39:30 UT

The HST team will be making a final decision early on June 26 about observing CC Scl based substantially on your observations, so they are essential.
 

20 June Alert Notice 485: AG Dra monitoring requested for multiwavelength campaign

June 20, 2013: Dr. Andrea Dupree (Harvard-Smithsonian Center for Astrophysics) has requested AAVSO monitoring of the symbiotic variable AG Draconis from now through at least September 2013 for correlation with upcoming Chandra x-ray and HST ultraviolet observations.

13 June Citizen Sky Research Paper Published

A science education research paper, 'Changes in participants' scientific attitudes and epistemological beliefs during an astronomical citizen science project', written by Aaron Price and Hee-Sun Lee has been published in the Journal of Research in Science Teaching (JRST).

12 June Solar Bulletin - Volume 69, Number 5

The May 2013 Solar Bulletin is now available.

12 June JAAVSO 41.1 is published

JAAVSO Volume 41, Number 1, 2013, is published

http://www.aavso.org/jaavso-published-volumes

12 June Special Notice #359: OR And monitoring needed for HST/COS campaign

June 12, 2013: Among the research options in the HST/COS CV campaign underway are observing two VY Scl stars in the low state, the only time the white dwarf is observable. OR And is now in its low state, at 18th V magnitude as of 2013 June 11 UT.

12 June Special Notice #358: BD Pav obs critial tonight

June 12, 2013: Based on your observations, the HST/COS team will be making the final decision tomorrow morning (2013 June 13) whether to observe BD Pav.

Your observations tonight (June 12/13) are CRITICAL. HST/COS is scheduled to observe the eclipsing dwarf nova BD Pav:

BD Pav 2013 June 14 04:40:42 through 09:46:09 UT


If you can observe BD Pav, a few V-band snapshots would be sufficient and very helpful. BD Pav is 15.4V at minimum and 12.4V at maximum.

07 June Special Notice #357: BD Pav next HST COS target followed by QZ Ser

June 7, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #356 (http://www.aavso.org/aavso-special-notice-356), HST/COS is scheduled to observe the eclipsing dwarf nova BD Pav:

BD Pav 2013 June 14 04:40:42 through 09:46:09 UT

06 June SAS Newsletter

The latest newsletter of the Society for Astronomical Sciences (SAS) with informantion on their most recent meeting - including a mention of our own Mike Simonsen!

06 June New eJAAVSO preprint: Very Short-Duration UV–B Optical Flares in RS CVn-type Star Systems

ej236: "Very Short-Duration UV–B Optical Flares in RS CVn-type Star Systems" by G. A. Vander Haagen

www.aavso.org/ejaavso

04 June Special Notice #356: V1108 Her obs urgent TONIGHT and new date for BD Pav

June 4, 2013: Further to AAVSO Alert Notice 471 (http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special Notice #355 (http://www.aavso.org/aavso-special-notice-355), 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

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.

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