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News and Announcements

30 August 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.

27 August AAVSO Special Notice #216

Two new FU Orionis variables in Cygnus

24 August 99th Fall Meeting of the AAVSO

Hilton Hotel

Woburn, Massachusetts
Oct. 28-30, 2010

24 August 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.

Please send comments and suggestions to Thanks!

24 August AAVSO Special Notice #215

Brightening of the symbiotic star CI Cyg

18 August 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

05 August AAVSO Facebook page reaches 2000 fans!

After passing the 1500 fans mark in April, the number of fans on the AAVSO Facebook page has grown steadily over the last four months. Tuesday, August 3, when we were just 137 people shy of the 2000 fans mark, a call went out to our members and friends through Facebook and Twitter to help us recruit enough new fans to get us over that benchmark. By 16:00UT on Thursday we had eclipsed the 2000 mark, and our ranks are still growing.

01 August AAVSO Special Notice #214

Outburst of V592 Her

August 1, 2010: Maciej Reszelski has reported an outburst of V592 Her
at CR=14.14mag. This WZ Sge variable last had a superoutburst
on August 26, 1998, when it reached 12th magnitudes.
In quiescence, V592 Her is fainter than 20th magnitude.

V592 Her is located at RA 16 30 56.37 DEC +21 16 58.2 (J2000).

30 July Special Notice #213: Request for observations of high-mass X-ray binaries

July 30, 2010: Dr. Gordon Sarty, University of Saskatchewan, Canada, requests our continuing assistance in his ongoing observations of High Mass X-ray Binaries (HMXBs). Dr. Sarty provides the following text for the current request:

26 July New Site: List of AAVSO Users

Over the next few months we will post a number of quick tips pointing out some new features/changes with the new web site. 

The first tip is about seeing who your fellow users are. Clicking on the URL below will give you a list of all registered users on the site:

26 July New Web Site Update!

100726 Update: Arne has posted an update to the migration to the AAVSO Discussion Group. We will continue to update the known bug list over the next few days. Please continue to send in comments and bugs. And don't forget to join us in the chat room on Monday.

16 July Alert Notice 422: Observing Campaign on Hubble's First Variable in M31: M31_V1

July 16, 2010: An observing campaign is being carried out on M31_V1, the first variable star discovered in M31 by Edwin Hubble. The Hubble Heritage Team, with Dr. Keith Noll, Space Telescope Science Institute (STScI), as Principal Investigator, plans to observe M31_V1 with the Hubble Space Telescope (HST), and needs to know the phase of this Cepheid variable. Although basic parameters are known for this star, no recent photometry exists, so observations are required to generate current phase information.

16 July Citizen Sky Planetarium Show w/Timothy Ferris

 Our Citizen Sky project has released a nice 7-minute planetarium trailer about Algol, eclipsing binary stars, epsilon Aurigae and more. It is narrated by Timothy Ferris and available on YouTube and also in hi-def and full-dome formats. 07/16/10

15 July AAVSO Newsletter #45

AAVSO Newsletter #45 has been posted. Check out articles about astronauts, challenges for visual observers, new articles for Eyepiece Views, reports from Galway astrofest and observing in Scotland, and much more.

13 July Astro Data Mining Blog

Dr. John Rachlin has launched a new blog highlighting resources useful for those interested in data mining astronomical databases. From his blog:

09 May Optical transient in Pegasus

09 May Possible Nova in Scorpius - N Sco 2010 No. 2

Central Bureau for Astronomical Telegrams CBET 2262 (Daniel W. E. Green, ed.) announces the discovery by Koichi Nishiyama, Kurume, Fukuoka-ken, Japan; and Fujio Kabashima, Miyaki-cho, Saga-ken, Japan, of a possible nova in Scorpius at magnitude 8.6 on two 40-s unfiltered CCD frames (limiting magnitude 13.1) taken around April 25.788 UT. They confirmed the new object on unfiltered CCD frames (limiting magnitude 17.3) taken around April 25.796 from which they measured the following precise position: R.A. = 16:55:13.16, Decl. = -38:03:46.9 (equinox 2000.0)

09 May Request for photometry of the dwarf nova SS Cygni

Further to AAVSO Special Notice 204 (2010 April 15), we are requesting additional observations of the bright dwarf nova SS Cygni currently in outburst. SS Cyg is currently beginning a dwarf nova outburst, and observations of this star made with the EVLA have detected the source at radio wavelengths. Observations of SS Cyg have been scheduled with the VLBA on 2010 April 22 and April 23. Continued optical monitoring of SS Cyg through the end of the current outburst is strongly encouraged, with intensive coverage requested during the VLBA observations.

09 May Rapid fading in the luminous blue variable S Doradus

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