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News and Announcements

20 December Charts and Sequences Update December 2012

The following charts (listed in order by constellation) have new or revised sequences since September 28, 2012. This list is quite long and includes all the stars in the new Binocular Program. A .csv file is available as an attachment here at the bottom of the page as well.

If you observe any of these stars please update your charts as soon as possible.

18 December Solar Bulletin - Volume 68, Number 11

The November 2012 Solar Bulletin is now available!

17 December Special Notice #316: Monitoring of the dwarf nova U Geminorum in support of HST observations

December 17, 2012: The AAVSO requests enhanced nightly monitoring of the dwarf nova U Gem in support of target-of-opportunity observations with HST's Cosmic Origins Spectrograph. These observations were requested by Dr.

14 December Alert Notice 474: Multiwavelength campaign on delta Ori (Mintaka)

December 14, 2012:  An international team of astronomers, including Drs.

11 December Special Notice #315: HST COS observing SDSS J075507.70+143547.6 December 13-14 and HS 0218+3229 is next target

December 11, 2012:  Further to AAVSO Alert Notice 471 ( and AAVSO Special Notice #309 (, HST COS is observing the WZ Sge-type cataclysmic variable SDSS J075507.70+143547.6 December 13-14:

            SDSS J075507.70+143547.6  13 December 2012 23:32:57 through 14 December 04:45:44 UT

10 December Citizen Sky Workshop to Produce a DSLR Photometry Manual
The Citizen Sky Project - Workshop III

Sponsored by:
The National Science Foundation and
The American Association of Variable Star Observers

When and Where:

The 3rd Citizen Sky Project Workshop will be held Friday-Sunday, March 22-24 at AAVSO Headquarters in Cambridge, MA.  We will kick-off the 3-day workshop with a meet-and-greet the evening of Thursday, March 21st. 

07 December New Chinese Visual Observing Manual

I am very pleased to announce that we now have TWO Chinese translations of the AAVSO Manual for Visual Observing of Variable Stars available for downloading. The newest addition to our collection of Manual translations is in "Traditional Chinese" which is used in Hong Kong, Macau, Taiwan and parts of southeast Asia. This beautiful translation was done by Tao Fan-Lin (陶蕃麟) who is the Director of the Taipei Association of Astronomy Now.

You can get both versions of the Chinese Manual here:

05 December Special Notice #314: HST COS scheduled to observe V405 Peg December 7

December 5, 2012: As announced in AAVSO Special Notice #313 (, HST COS is scheduled to observe the UG-type dwarf nova V405 Peg

                        7 December 2012 02:31:20 through 07:50:03 UT

03 December 2013 JD Calendar

The 2013 JD Calendar is now available.

Go to the JD Calendar page and scroll down to the bottom where you will be able to view or download the new calendar.

Clear Skies!

03 December New eJAAVSO preprint: Variable Stars South EB Database

ej224: "The Variable Stars South Eclipsing Binary Database" by T. Richards

30 November Special Notice #313: HST COS observing CW Mon tonight and V405 Peg is next target

November 30, 2012: Further to AAVSO Alert Notice 471 ( and AAVSO Special Notice #311 (,

27 November Special Notice #312: Supernova 2012gx in MCG -02-2-72 = PSN J00380175-1351395

November 27, 2012: IAU Central Bureau Electronic Telegram 3314 (Daniel W. E. Green, ed.) announces the discovery by A. J. Drake, S. G. Djorgovski, M. J. Graham, A. Mahabal, and R. Williams (California Institute of Technology); R. H. McNaught (Australian National University); J. L. Prieto (Princeton University); M. Catelan (Pontificia Universidad Catolica de Chile); and S. M. Larson and E.

24 November Solar Bulletin - Volume 68, Number 10

The October 2012 Solar Bulletin is now available!

20 November Special Notice #311: HST COS to observe CW Mon 2012 November 30 - December 1

November 20, 2012:  The HST COS far ultraviolet observations of the dwarf nova CW Mon will be taking place 2012 November 30 20:54:49 through 2012 December 1 02:26:15 UT (AAVSO Special Notice #309,

19 November Eye candy from Bright Star Monitor South

At the moment, I'm taking a short break from doing some programming and beta testing for our latest AAVSOnet telescope to come online, Bright Star Monitor - South.  This is a twin of the Bright Star Monitor that ran in New Mexico for the past few years, but installed on the opposite side of the world.  BSM-South is hosted by Peter Nelson (NLX) a few dozen miles east of Melbourne, Australia, and has been operating in a "hands-on" capacity for several months now. 

15 November Special Notice #310: Continued observing of V452 Cas requested

November 15, 2012: As announced in [baavss-alert] on 15 November 2012, Dr. Chris Lloyd (University of Sussex) has requested that the SU UMa-type dwarf nova V452 Cas continue to be observed in order to maintain the good historical coverage of its superoutbursts. He writes: "Over the past several years we have accumulated enviable coverage of V452 Cas' superoutbursts but the general monitoring has dropped off recently as people have moved on to more interesting objects.

13 November Special Notice #309: Next Set of HST COS targets announced

* revised November 20, 2012: CW Mon - scheduled observation dates and times are 2012 November 30 20:54:49 through December 1 02:26:15 UT; see details in AAVSO Special Notice #311.

13 November Special Notice #308: Observations crucial starting tonight for FL Psc (ASAS J002511+1217.2)

November 13, 2012: The HST COS far ultraviolet observations of the WZ Sge-type cataclysmic variable FL Psc (ASAS J002511+1217.2) will be taking place 2012 November 15 22:48:37 UT through November 16 04:49:58 UT (AAVSO Special Notice #305

09 November New eJAAVSO preprint: ROAD intensive observations of variables stars

ej223: "ROAD (Remote Observatory Atacama Desert): Intensive Observations of Variable Stars" by F.-J. Hambsch

08 November Special Notice #307: Observations crucial tonight for SDSS J001153.08-064739.1

November 8, 2012: The HST COS far ultraviolet observations of the dwarf nova SDSS J001153.08-064739.1 have been scheduled for 2012 November 9 20:42:29 UT through November 10 04:57:33 UT (AAVSO Special Notice #304).

Your observations from tonight are crucial to confirm whether the target is at minimum (which it must be for HST to observe it).

07 November Special Notice #306: Telluric standards for T Tau stars campaign spectroscopists

7 November 2012: Further to AAVSO Alert Notice 473 ( alert-notice/473), Principal Investigator Darryl Sergison (University of Exeter) requests that spectroscopists planning to observe the targets RY Tau, DN Tau, and/or DR Tau image the corresponding telluric standards below at the same time:

Telluric standard for RY Tau
HD 283567     B9     Vmag = 10.38   RA 04 20 33.072  Dec +28 39 08.55

06 November 101st Annual Meeting of the AAVSO - Archive

Meeting Archive Materials:

06 November Alert Notice 473: T Tauri stars observing campaign

November 6, 2012:  Darryl Sergison (University of Exeter) has requested AAVSO assistance with a campaign he is organizing on six T Tauri stars. He writes: "In Autumn 2013 I [and my PhD supervisor Tim Naylor of Exeter University are] undertaking a new study into the nature of pre-main-sequence low mass stars, using time series optical spectroscopy and UV-Visual-IR build a clearer picture of the environment around young solar-type stars and characterise their various disc, accretion, and outflow structures.

05 November New eJAAVSO preprint: Period Analysis of 55 Semiregular (SR/SRa/SRb) Variables

ej222: "Period Analysis of AAVSO Visual Observations of 55 Semiregular (SR/SRa/SRb) Variables"
 by J. R. Percy and P. Jx Tan

05 November Special Notice #305: HST COS observations of FL Psc (ASAS J002511+1217.2) scheduled

November 5, 2012: Further to AAVSO Alert Notice 471 (Gaensicke, Patterson, and Henden), the HST COS (Cosmic Origins Spectrograph) far ultraviolet observations of THE NEXT TARGET from the list, the WZ Sge-type cataclysmic variable

                     FL Psc (ASAS J002511+1217.2),

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