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Alert Notice 424: Monitoring and Study of V2672 Oph

September 14, 2010: V2672 Oph (Nova Oph 2009) was discovered by Koichi Itagaki in outburst on August 16, 2009 (see AAVSO Alert Notice 402 and IAUC 9064).  It peaked at about magnitude 12, and rapidly faded.  Low- and medium-resolution spectroscopy showed broad, prominent H_alpha emission with FWHM 11500 km/s on top of a featureless, but very red, continuum.

Longtime AAVSOer Wins Prestigious Award

Longtime AAVSO Member and past AAVSO Council Member, Doug Welch, has been awarded the prestigious McNeil Medal by the Royal Society of Canada.  For more information see the announcement on McMaster University's web site.

Special Notice #217: SN 2010hg in NGC 3001

September 2, 2010: We have been notified by Dan Green, Central Bureau for Astronomical Telegrams, that Berto Monard (MLF), Pretoria, South Africa, has discovered a bright supernova (discovered at 15.0, brightened to 14.7 in 24 hours) in NGC 3001. Here are details quoted from CBET 2434 (Green, ed.):

Alert Notice 423: Request for observations of V455 AND in support of HST observations

August 30, 2010: Dr. Paula Szkody (U. Washington) has requested the help of AAVSO observers in monitoring the WZ Sge-type cataclysmic variable V455 And in support of Hubble Space Telescope ultraviolet spectroscopic observations scheduled for 6:55-15:20 2010 September 11 UT (the night of Friday, September 10/11) (JD 2455450.78819 - 2455451.13889). Observations are requested beginning immediately and continuing through September 20. This monitoring is crucial to these observations.

Special Notice #216: Two new FU Orionis variables in Cygnus

August 27, 2010: Two new eruptive, pre-main sequence stars of FU Orionis type have recently been discovered in Cygnus.  Observations of both are encouraged to better characterize the behaviors of these two objects.

99th Fall Meeting of the AAVSO

Hilton Hotel

Woburn, Massachusetts
Oct. 28-30, 2010

New AAVSO Chat Room

We have installed new chat room software. Click the link below to test it out for us. We think it is easier to use than the old software and also works in more web browser clients. You can also create your own private chat rooms for discussion with other members.

http://www.aavso.org/open-discussion

Please send comments and suggestions to aavso@aavso.org. Thanks!

Special Notice #215: Brightening of the symbiotic star CI Cyg

August 24, 2010: Observer Gary Poyner (Birmingham, UK) reports that the symbiotic star CI Cygni has noticeably brightened over the past few days.  Poyner reports the star at a magnitude of m(vis)=9.8 on 2010 August 23.92 (JD 2455432.42). CI Cyg has been in a slow rise for several months, beginning immediately after the end of the last outburst.  Continued monitoring of CI Cyg over the next several weeks and months will be useful for better understanding the nature of this star system and its outbursts.

Charts and Sequences Update

The charts and sequences team has been busy updating old and creating
new sequences for AAVSO variable star charts.

Tom Bretl and Tim Crawford in particular have been very ambitious, and
I would like to extend my own personal "thank you for a job well
done". They have devoted literally hundreds of hours of work to this
effort in the last couple years, resulting in almost 600 chart
revisions.

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