Skip to main content

News and Announcements

23 November Alert Notice 427: Observing campaign on BM Ori and the Trapezium region

November 23, 2010: The AAVSO requests ground-based observations of the Trapezium region of the Orion Nebula (M42), along with surrounding regions in Orion, in conjunction with upcoming observations with the MOST Satellite.  All AAVSO observers are encouraged to participate in this project, and we are requesting observations for a number of different targets from both instrumental and visual observers.

23 November AAVSO Special Notice #224

Possible outburst of SDSS_J160501.35+203056.9

18 November AAVSO Special Notice #223

BL Lac object 3C 454.3 undergoing bright flare

16 November Web Chat with our New Web Developer

Join us in the AAVSO Chat Room on Wednesday, November 17 from 2-3pm eastern (7-8pm UT) for a special chat with Will McMain, the newest AAVSO staff member. Will was hired in September as our new Web Developer and has been busy updating and adding items to the new web site. Many of you met him at the fall meeting where he ran the AV for the Saturday session and also hung out with us in the evenings. A staff bio is here:

11 November Fall Meeting: Presentation Files

Below are presentation files that are available for download (as ppt or pdf files) from the 99th Annual Meeting of the AAVSO.  Click on the title to view or download the presentation file.

06 November Meetings Survey

Rebecca and I have put together a 8-item survey about AAVSO meetings. The goal of this survey is to give us information about what is important to you when you make decisions about meeting attendance. It includes questions about preferred locations, meeting structure, content of talks, etc. If you have a moment, please give us 5-10 minutes to take the survey. We would like everyone interested to take the survey, whether you have attended a prior meeting or not.

05 November AAVSO Special Notice #222

Bright Supernova in UGC 5189A: SN 2010jl

November 5, 2010: We have been informed by Tim Puckett and by the Central Bureau for Astronomical Telegrams (CBET 2532, Daniel W. E. Green, Ed.) of the discovery of a bright possible supernova in UGC 5189A by J. Newton and Puckett, Portal, AZ, on November 3.52 UT at unfiltered magnitude 13.5. Confirming images (limiting magnitude 19.1) by Puckett on Nov. 4.50 UT showed the object at magnitude 12.9./p>

02 November AAVSO Special Notice 221

Infrequent Outburst of the SU UMa Variable HT Cas

20 October AAVSO Special Notice #220

Request for observations of high-mass X-ray binaries (HMXBs) in support of radial velocity observations

15 October AAVSO Newsletter 46

The October 2010 issue of the AAVSO Newsletter is now available

15 October Three recent JAAVSO preprints

"Absolute Magnitudes and Distances of Recent Novae" by Yitping Kok

"Ross 4—A Possible Recurrent Nova?" by Samantha J. Brown, O. F. Mills, Wayne Osborn, and Vivian Hoette

"A Simple, Portable Apparatus to Measure Night Sky Brightness at Various Zenith Angles" by Jennifer Birriel and James Kevin Adkins

12 October AAVSO Special Notice #219

Eclipse of the symbiotic star CI Cygni

11 October AAVSO Abstracts 1951 - 1971

This is part of our ongoing series to highlight new features of the new AAVSO web site.

Matt Templeton scanned all of the abstracts and put them online in PDF format. The abstracts cover items presented at meetings, but often include much more info than a modern day abstract. For example, the last issue includes abstracts that are over 3 pages long, meeting memories, history of the AAVSO articles and even a poem! Here is his description of the abstracts from the first paragraph on the web page:

07 October AAVSO 2011 Calendar Survey

The AAVSO is making another calendar! The calendar for 2011, our Centennial year, and will include lots of AAVSO historical notes - important dates, pictures of how variable star observing has evolved in the last 100 years, notes about the legacy of our Directors. We're still planning the last details, but we expect the cost to be between $10 and $15 each (including shipping). We're planning on having the calendars finished and ready to ship out during November.  This is one memento from the AAVSO that you don't want to miss!

05 October Alert Notice 426: Rescheduled request for observations of V455 AND in support of HST observations

October 5, 2010: As originally announced in AAVSO Alert Notice 423, 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.

01 October Alert Notice 425: Monitoring of HBC 722 and VSX J205126.1+440523 Requested

October 1, 2010: Dr. Colin Aspin (U. Hawai'i) has requested the help of AAVSO observers in performing long-term photometric monitoring of the two new young stellar objects (YSOs) in Cygnus, HBC 722 and VSX J205126.1+440523 (see AAVSO Special Notice #216).  

22 September RR Lyrae

RR Lyrae, 1 degree field, DSS I survey plate
(copyright 1993-1995 CalTech/STScI)

21 September Mystery in the Sky Documentary

Sept. 24 Update: The goal has been met! Click here for Guustaaf's update. Thanks to everyone who contributed!

21 September APASS: The AAVSO Photometric All-Sky Survey

APASS: The AAVSO Photometric All-Sky Survey

Data release 1 of APASS occurred on 2010 September 10, and contained photometry for approximately four million stars distributed among several hundred discrete fields between -10.15 < Dec < +87.35.  Data release 2 occurred on 2011 February 10, and included an additional four million stars from the southern hemisphere, acquired from our site at CTIO.   Data Release 3 occurred on 2011 August 10, and further extended southern hemisphere coverage.

21 September AAVSO Special Notice #218

Outburst of the UGWZ star SDSS J080434.20+510349.2

14 September 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.

09 September 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.

02 September AAVSO 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.):

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

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