News and Announcements


08 July	Special Notice #362: OR And and AX For obs critical now	July 8, 2013: The VY Scl variable OR And continues in its low state, so it has been scheduled for HST/COS observations. Based on your observations, the HST/COS team will be making the final decision tomorrow morning (2013 July 9) whether to observe OR And on: OR And 2013 July 10 11:47:01 through 15:56:12 UT OR And is ~18V in its low state and ~14.5V in its high state.
03 July	The July AAVSO Newsletter is published	AAVSO Newsletter 57 - July 2013 http://www.aavso.org/aavso-newsletter
01 July	Visual Observing Manual in Hungarian - 2013 edition	The Hungarian version of the recently revised Manual for Visual Observing of Variable Stars - Vizuális Változócsillag-észlelők Kézikönyve - is now available for download here: http://www.aavso.org/visual-observing-manual-hungarian
25 June	Charts and Sequences Update June 2013	Improvements to existing sequences and creation of new sequences for newly discovered and previously known variables continues at a brisk pace. Below is a list of new or revised sequences adopted since April 4, 2013. If you observe any of these stars, please be sure you are using th most recent version of the comparison star sequence on your charts. This list is attached below in .csv and .xlsx formats for your convenience.
24 June	Special Notice #361: CC Scl observations DATE REVISED	*June 24, 2013: The date given in AAVSO Special Notice #360* for the HST/COS observations of the SU UMa-type dwarf nova CC Scl has been REVISED from June 27 to: CC Scl 2013 Jun 29 03:19:13 through 05:54:10 UT** The HST team will be making a final decision early on June 28 about observing CC Scl based substantially on your observations, so they are essential.
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

News and Announcements

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